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11#include <linux/can/skb.h>
12
13#include "j1939-priv.h"
14
15#define J1939_XTP_TX_RETRY_LIMIT 100
16
17#define J1939_ETP_PGN_CTL 0xc800
18#define J1939_ETP_PGN_DAT 0xc700
19#define J1939_TP_PGN_CTL 0xec00
20#define J1939_TP_PGN_DAT 0xeb00
21
22#define J1939_TP_CMD_RTS 0x10
23#define J1939_TP_CMD_CTS 0x11
24#define J1939_TP_CMD_EOMA 0x13
25#define J1939_TP_CMD_BAM 0x20
26#define J1939_TP_CMD_ABORT 0xff
27
28#define J1939_ETP_CMD_RTS 0x14
29#define J1939_ETP_CMD_CTS 0x15
30#define J1939_ETP_CMD_DPO 0x16
31#define J1939_ETP_CMD_EOMA 0x17
32#define J1939_ETP_CMD_ABORT 0xff
33
34enum j1939_xtp_abort {
35 J1939_XTP_NO_ABORT = 0,
36 J1939_XTP_ABORT_BUSY = 1,
37
38
39
40
41
42
43
44 J1939_XTP_ABORT_RESOURCE = 2,
45
46
47
48
49
50
51
52
53
54 J1939_XTP_ABORT_TIMEOUT = 3,
55
56
57
58
59
60
61
62
63 J1939_XTP_ABORT_GENERIC = 4,
64
65
66
67
68
69
70 J1939_XTP_ABORT_FAULT = 5,
71
72
73
74
75
76
77 J1939_XTP_ABORT_UNEXPECTED_DATA = 6,
78
79
80
81
82
83
84 J1939_XTP_ABORT_BAD_SEQ = 7,
85
86
87
88
89
90
91 J1939_XTP_ABORT_DUP_SEQ = 8,
92
93
94
95
96 J1939_XTP_ABORT_EDPO_UNEXPECTED = 9,
97
98
99
100
101 J1939_XTP_ABORT_BAD_EDPO_PGN = 10,
102
103
104 J1939_XTP_ABORT_EDPO_OUTOF_CTS = 11,
105
106
107 J1939_XTP_ABORT_BAD_EDPO_OFFSET = 12,
108
109
110 J1939_XTP_ABORT_OTHER_DEPRECATED = 13,
111
112
113 J1939_XTP_ABORT_ECTS_UNXPECTED_PGN = 14,
114
115
116 J1939_XTP_ABORT_ECTS_TOO_BIG = 15,
117
118
119 J1939_XTP_ABORT_OTHER = 250,
120
121
122
123};
124
125static unsigned int j1939_tp_block = 255;
126static unsigned int j1939_tp_packet_delay;
127static unsigned int j1939_tp_padding = 1;
128
129
130static const char *j1939_xtp_abort_to_str(enum j1939_xtp_abort abort)
131{
132 switch (abort) {
133 case J1939_XTP_ABORT_BUSY:
134 return "Already in one or more connection managed sessions and cannot support another.";
135 case J1939_XTP_ABORT_RESOURCE:
136 return "System resources were needed for another task so this connection managed session was terminated.";
137 case J1939_XTP_ABORT_TIMEOUT:
138 return "A timeout occurred and this is the connection abort to close the session.";
139 case J1939_XTP_ABORT_GENERIC:
140 return "CTS messages received when data transfer is in progress";
141 case J1939_XTP_ABORT_FAULT:
142 return "Maximal retransmit request limit reached";
143 case J1939_XTP_ABORT_UNEXPECTED_DATA:
144 return "Unexpected data transfer packet";
145 case J1939_XTP_ABORT_BAD_SEQ:
146 return "Bad sequence number (and software is not able to recover)";
147 case J1939_XTP_ABORT_DUP_SEQ:
148 return "Duplicate sequence number (and software is not able to recover)";
149 case J1939_XTP_ABORT_EDPO_UNEXPECTED:
150 return "Unexpected EDPO packet (ETP) or Message size > 1785 bytes (TP)";
151 case J1939_XTP_ABORT_BAD_EDPO_PGN:
152 return "Unexpected EDPO PGN (PGN in EDPO is bad)";
153 case J1939_XTP_ABORT_EDPO_OUTOF_CTS:
154 return "EDPO number of packets is greater than CTS";
155 case J1939_XTP_ABORT_BAD_EDPO_OFFSET:
156 return "Bad EDPO offset";
157 case J1939_XTP_ABORT_OTHER_DEPRECATED:
158 return "Deprecated. Use 250 instead (Any other reason)";
159 case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN:
160 return "Unexpected ECTS PGN (PGN in ECTS is bad)";
161 case J1939_XTP_ABORT_ECTS_TOO_BIG:
162 return "ECTS requested packets exceeds message size";
163 case J1939_XTP_ABORT_OTHER:
164 return "Any other reason (if a Connection Abort reason is identified that is not listed in the table use code 250)";
165 default:
166 return "<unknown>";
167 }
168}
169
170static int j1939_xtp_abort_to_errno(struct j1939_priv *priv,
171 enum j1939_xtp_abort abort)
172{
173 int err;
174
175 switch (abort) {
176 case J1939_XTP_NO_ABORT:
177 WARN_ON_ONCE(abort == J1939_XTP_NO_ABORT);
178 err = 0;
179 break;
180 case J1939_XTP_ABORT_BUSY:
181 err = EALREADY;
182 break;
183 case J1939_XTP_ABORT_RESOURCE:
184 err = EMSGSIZE;
185 break;
186 case J1939_XTP_ABORT_TIMEOUT:
187 err = EHOSTUNREACH;
188 break;
189 case J1939_XTP_ABORT_GENERIC:
190 err = EBADMSG;
191 break;
192 case J1939_XTP_ABORT_FAULT:
193 err = ENOTRECOVERABLE;
194 break;
195 case J1939_XTP_ABORT_UNEXPECTED_DATA:
196 err = ENOTCONN;
197 break;
198 case J1939_XTP_ABORT_BAD_SEQ:
199 err = EILSEQ;
200 break;
201 case J1939_XTP_ABORT_DUP_SEQ:
202 err = EPROTO;
203 break;
204 case J1939_XTP_ABORT_EDPO_UNEXPECTED:
205 err = EPROTO;
206 break;
207 case J1939_XTP_ABORT_BAD_EDPO_PGN:
208 err = EPROTO;
209 break;
210 case J1939_XTP_ABORT_EDPO_OUTOF_CTS:
211 err = EPROTO;
212 break;
213 case J1939_XTP_ABORT_BAD_EDPO_OFFSET:
214 err = EPROTO;
215 break;
216 case J1939_XTP_ABORT_OTHER_DEPRECATED:
217 err = EPROTO;
218 break;
219 case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN:
220 err = EPROTO;
221 break;
222 case J1939_XTP_ABORT_ECTS_TOO_BIG:
223 err = EPROTO;
224 break;
225 case J1939_XTP_ABORT_OTHER:
226 err = EPROTO;
227 break;
228 default:
229 netdev_warn(priv->ndev, "Unknown abort code %i", abort);
230 err = EPROTO;
231 }
232
233 return err;
234}
235
236static inline void j1939_session_list_lock(struct j1939_priv *priv)
237{
238 spin_lock_bh(&priv->active_session_list_lock);
239}
240
241static inline void j1939_session_list_unlock(struct j1939_priv *priv)
242{
243 spin_unlock_bh(&priv->active_session_list_lock);
244}
245
246void j1939_session_get(struct j1939_session *session)
247{
248 kref_get(&session->kref);
249}
250
251
252static void __j1939_session_drop(struct j1939_session *session)
253{
254 if (!session->transmission)
255 return;
256
257 j1939_sock_pending_del(session->sk);
258 sock_put(session->sk);
259}
260
261static void j1939_session_destroy(struct j1939_session *session)
262{
263 if (session->transmission) {
264 if (session->err)
265 j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_ABORT);
266 else
267 j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_ACK);
268 } else if (session->err) {
269 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT);
270 }
271
272 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
273
274 WARN_ON_ONCE(!list_empty(&session->sk_session_queue_entry));
275 WARN_ON_ONCE(!list_empty(&session->active_session_list_entry));
276
277 skb_queue_purge(&session->skb_queue);
278 __j1939_session_drop(session);
279 j1939_priv_put(session->priv);
280 kfree(session);
281}
282
283static void __j1939_session_release(struct kref *kref)
284{
285 struct j1939_session *session = container_of(kref, struct j1939_session,
286 kref);
287
288 j1939_session_destroy(session);
289}
290
291void j1939_session_put(struct j1939_session *session)
292{
293 kref_put(&session->kref, __j1939_session_release);
294}
295
296static void j1939_session_txtimer_cancel(struct j1939_session *session)
297{
298 if (hrtimer_cancel(&session->txtimer))
299 j1939_session_put(session);
300}
301
302static void j1939_session_rxtimer_cancel(struct j1939_session *session)
303{
304 if (hrtimer_cancel(&session->rxtimer))
305 j1939_session_put(session);
306}
307
308void j1939_session_timers_cancel(struct j1939_session *session)
309{
310 j1939_session_txtimer_cancel(session);
311 j1939_session_rxtimer_cancel(session);
312}
313
314static inline bool j1939_cb_is_broadcast(const struct j1939_sk_buff_cb *skcb)
315{
316 return (!skcb->addr.dst_name && (skcb->addr.da == 0xff));
317}
318
319static void j1939_session_skb_drop_old(struct j1939_session *session)
320{
321 struct sk_buff *do_skb;
322 struct j1939_sk_buff_cb *do_skcb;
323 unsigned int offset_start;
324 unsigned long flags;
325
326 if (skb_queue_len(&session->skb_queue) < 2)
327 return;
328
329 offset_start = session->pkt.tx_acked * 7;
330
331 spin_lock_irqsave(&session->skb_queue.lock, flags);
332 do_skb = skb_peek(&session->skb_queue);
333 do_skcb = j1939_skb_to_cb(do_skb);
334
335 if ((do_skcb->offset + do_skb->len) < offset_start) {
336 __skb_unlink(do_skb, &session->skb_queue);
337
338 skb_unref(do_skb);
339
340 kfree_skb(do_skb);
341 }
342 spin_unlock_irqrestore(&session->skb_queue.lock, flags);
343}
344
345void j1939_session_skb_queue(struct j1939_session *session,
346 struct sk_buff *skb)
347{
348 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
349 struct j1939_priv *priv = session->priv;
350
351 j1939_ac_fixup(priv, skb);
352
353 if (j1939_address_is_unicast(skcb->addr.da) &&
354 priv->ents[skcb->addr.da].nusers)
355 skcb->flags |= J1939_ECU_LOCAL_DST;
356
357 skcb->flags |= J1939_ECU_LOCAL_SRC;
358
359 skb_get(skb);
360 skb_queue_tail(&session->skb_queue, skb);
361}
362
363static struct
364sk_buff *j1939_session_skb_get_by_offset(struct j1939_session *session,
365 unsigned int offset_start)
366{
367 struct j1939_priv *priv = session->priv;
368 struct j1939_sk_buff_cb *do_skcb;
369 struct sk_buff *skb = NULL;
370 struct sk_buff *do_skb;
371 unsigned long flags;
372
373 spin_lock_irqsave(&session->skb_queue.lock, flags);
374 skb_queue_walk(&session->skb_queue, do_skb) {
375 do_skcb = j1939_skb_to_cb(do_skb);
376
377 if (offset_start >= do_skcb->offset &&
378 offset_start < (do_skcb->offset + do_skb->len)) {
379 skb = do_skb;
380 }
381 }
382
383 if (skb)
384 skb_get(skb);
385
386 spin_unlock_irqrestore(&session->skb_queue.lock, flags);
387
388 if (!skb)
389 netdev_dbg(priv->ndev, "%s: 0x%p: no skb found for start: %i, queue size: %i\n",
390 __func__, session, offset_start,
391 skb_queue_len(&session->skb_queue));
392
393 return skb;
394}
395
396static struct sk_buff *j1939_session_skb_get(struct j1939_session *session)
397{
398 unsigned int offset_start;
399
400 offset_start = session->pkt.dpo * 7;
401 return j1939_session_skb_get_by_offset(session, offset_start);
402}
403
404
405
406
407static inline int j1939_tp_im_receiver(const struct j1939_sk_buff_cb *skcb)
408{
409 return skcb->flags & J1939_ECU_LOCAL_DST;
410}
411
412
413static inline int j1939_tp_im_transmitter(const struct j1939_sk_buff_cb *skcb)
414{
415 return skcb->flags & J1939_ECU_LOCAL_SRC;
416}
417
418
419static int j1939_tp_im_involved(const struct j1939_sk_buff_cb *skcb, bool swap)
420{
421 if (swap)
422 return j1939_tp_im_receiver(skcb);
423 else
424 return j1939_tp_im_transmitter(skcb);
425}
426
427static int j1939_tp_im_involved_anydir(struct j1939_sk_buff_cb *skcb)
428{
429 return skcb->flags & (J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST);
430}
431
432
433static inline pgn_t j1939_xtp_ctl_to_pgn(const u8 *dat)
434{
435 pgn_t pgn;
436
437 pgn = (dat[7] << 16) | (dat[6] << 8) | (dat[5] << 0);
438 if (j1939_pgn_is_pdu1(pgn))
439 pgn &= 0xffff00;
440 return pgn;
441}
442
443static inline unsigned int j1939_tp_ctl_to_size(const u8 *dat)
444{
445 return (dat[2] << 8) + (dat[1] << 0);
446}
447
448static inline unsigned int j1939_etp_ctl_to_packet(const u8 *dat)
449{
450 return (dat[4] << 16) | (dat[3] << 8) | (dat[2] << 0);
451}
452
453static inline unsigned int j1939_etp_ctl_to_size(const u8 *dat)
454{
455 return (dat[4] << 24) | (dat[3] << 16) |
456 (dat[2] << 8) | (dat[1] << 0);
457}
458
459
460
461
462
463
464
465static bool j1939_session_match(struct j1939_addr *se_addr,
466 struct j1939_addr *sk_addr, bool reverse)
467{
468 if (se_addr->type != sk_addr->type)
469 return false;
470
471 if (reverse) {
472 if (se_addr->src_name) {
473 if (se_addr->src_name != sk_addr->dst_name)
474 return false;
475 } else if (se_addr->sa != sk_addr->da) {
476 return false;
477 }
478
479 if (se_addr->dst_name) {
480 if (se_addr->dst_name != sk_addr->src_name)
481 return false;
482 } else if (se_addr->da != sk_addr->sa) {
483 return false;
484 }
485 } else {
486 if (se_addr->src_name) {
487 if (se_addr->src_name != sk_addr->src_name)
488 return false;
489 } else if (se_addr->sa != sk_addr->sa) {
490 return false;
491 }
492
493 if (se_addr->dst_name) {
494 if (se_addr->dst_name != sk_addr->dst_name)
495 return false;
496 } else if (se_addr->da != sk_addr->da) {
497 return false;
498 }
499 }
500
501 return true;
502}
503
504static struct
505j1939_session *j1939_session_get_by_addr_locked(struct j1939_priv *priv,
506 struct list_head *root,
507 struct j1939_addr *addr,
508 bool reverse, bool transmitter)
509{
510 struct j1939_session *session;
511
512 lockdep_assert_held(&priv->active_session_list_lock);
513
514 list_for_each_entry(session, root, active_session_list_entry) {
515 j1939_session_get(session);
516 if (j1939_session_match(&session->skcb.addr, addr, reverse) &&
517 session->transmission == transmitter)
518 return session;
519 j1939_session_put(session);
520 }
521
522 return NULL;
523}
524
525static struct
526j1939_session *j1939_session_get_simple(struct j1939_priv *priv,
527 struct sk_buff *skb)
528{
529 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
530 struct j1939_session *session;
531
532 lockdep_assert_held(&priv->active_session_list_lock);
533
534 list_for_each_entry(session, &priv->active_session_list,
535 active_session_list_entry) {
536 j1939_session_get(session);
537 if (session->skcb.addr.type == J1939_SIMPLE &&
538 session->tskey == skcb->tskey && session->sk == skb->sk)
539 return session;
540 j1939_session_put(session);
541 }
542
543 return NULL;
544}
545
546static struct
547j1939_session *j1939_session_get_by_addr(struct j1939_priv *priv,
548 struct j1939_addr *addr,
549 bool reverse, bool transmitter)
550{
551 struct j1939_session *session;
552
553 j1939_session_list_lock(priv);
554 session = j1939_session_get_by_addr_locked(priv,
555 &priv->active_session_list,
556 addr, reverse, transmitter);
557 j1939_session_list_unlock(priv);
558
559 return session;
560}
561
562static void j1939_skbcb_swap(struct j1939_sk_buff_cb *skcb)
563{
564 u8 tmp = 0;
565
566 swap(skcb->addr.dst_name, skcb->addr.src_name);
567 swap(skcb->addr.da, skcb->addr.sa);
568
569
570 if (skcb->flags & J1939_ECU_LOCAL_SRC)
571 tmp |= J1939_ECU_LOCAL_DST;
572 if (skcb->flags & J1939_ECU_LOCAL_DST)
573 tmp |= J1939_ECU_LOCAL_SRC;
574 skcb->flags &= ~(J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST);
575 skcb->flags |= tmp;
576}
577
578static struct
579sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv,
580 const struct j1939_sk_buff_cb *re_skcb,
581 bool ctl,
582 bool swap_src_dst)
583{
584 struct sk_buff *skb;
585 struct j1939_sk_buff_cb *skcb;
586
587 skb = alloc_skb(sizeof(struct can_frame) + sizeof(struct can_skb_priv),
588 GFP_ATOMIC);
589 if (unlikely(!skb))
590 return ERR_PTR(-ENOMEM);
591
592 skb->dev = priv->ndev;
593 can_skb_reserve(skb);
594 can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
595 can_skb_prv(skb)->skbcnt = 0;
596
597 skb_reserve(skb, offsetof(struct can_frame, data));
598
599 memcpy(skb->cb, re_skcb, sizeof(skb->cb));
600 skcb = j1939_skb_to_cb(skb);
601 if (swap_src_dst)
602 j1939_skbcb_swap(skcb);
603
604 if (ctl) {
605 if (skcb->addr.type == J1939_ETP)
606 skcb->addr.pgn = J1939_ETP_PGN_CTL;
607 else
608 skcb->addr.pgn = J1939_TP_PGN_CTL;
609 } else {
610 if (skcb->addr.type == J1939_ETP)
611 skcb->addr.pgn = J1939_ETP_PGN_DAT;
612 else
613 skcb->addr.pgn = J1939_TP_PGN_DAT;
614 }
615
616 return skb;
617}
618
619
620static int j1939_tp_tx_dat(struct j1939_session *session,
621 const u8 *dat, int len)
622{
623 struct j1939_priv *priv = session->priv;
624 struct sk_buff *skb;
625
626 skb = j1939_tp_tx_dat_new(priv, &session->skcb,
627 false, false);
628 if (IS_ERR(skb))
629 return PTR_ERR(skb);
630
631 skb_put_data(skb, dat, len);
632 if (j1939_tp_padding && len < 8)
633 memset(skb_put(skb, 8 - len), 0xff, 8 - len);
634
635 return j1939_send_one(priv, skb);
636}
637
638static int j1939_xtp_do_tx_ctl(struct j1939_priv *priv,
639 const struct j1939_sk_buff_cb *re_skcb,
640 bool swap_src_dst, pgn_t pgn, const u8 *dat)
641{
642 struct sk_buff *skb;
643 u8 *skdat;
644
645 if (!j1939_tp_im_involved(re_skcb, swap_src_dst))
646 return 0;
647
648 skb = j1939_tp_tx_dat_new(priv, re_skcb, true, swap_src_dst);
649 if (IS_ERR(skb))
650 return PTR_ERR(skb);
651
652 skdat = skb_put(skb, 8);
653 memcpy(skdat, dat, 5);
654 skdat[5] = (pgn >> 0);
655 skdat[6] = (pgn >> 8);
656 skdat[7] = (pgn >> 16);
657
658 return j1939_send_one(priv, skb);
659}
660
661static inline int j1939_tp_tx_ctl(struct j1939_session *session,
662 bool swap_src_dst, const u8 *dat)
663{
664 struct j1939_priv *priv = session->priv;
665
666 return j1939_xtp_do_tx_ctl(priv, &session->skcb,
667 swap_src_dst,
668 session->skcb.addr.pgn, dat);
669}
670
671static int j1939_xtp_tx_abort(struct j1939_priv *priv,
672 const struct j1939_sk_buff_cb *re_skcb,
673 bool swap_src_dst,
674 enum j1939_xtp_abort err,
675 pgn_t pgn)
676{
677 u8 dat[5];
678
679 if (!j1939_tp_im_involved(re_skcb, swap_src_dst))
680 return 0;
681
682 memset(dat, 0xff, sizeof(dat));
683 dat[0] = J1939_TP_CMD_ABORT;
684 dat[1] = err;
685 return j1939_xtp_do_tx_ctl(priv, re_skcb, swap_src_dst, pgn, dat);
686}
687
688void j1939_tp_schedule_txtimer(struct j1939_session *session, int msec)
689{
690 j1939_session_get(session);
691 hrtimer_start(&session->txtimer, ms_to_ktime(msec),
692 HRTIMER_MODE_REL_SOFT);
693}
694
695static inline void j1939_tp_set_rxtimeout(struct j1939_session *session,
696 int msec)
697{
698 j1939_session_rxtimer_cancel(session);
699 j1939_session_get(session);
700 hrtimer_start(&session->rxtimer, ms_to_ktime(msec),
701 HRTIMER_MODE_REL_SOFT);
702}
703
704static int j1939_session_tx_rts(struct j1939_session *session)
705{
706 u8 dat[8];
707 int ret;
708
709 memset(dat, 0xff, sizeof(dat));
710
711 dat[1] = (session->total_message_size >> 0);
712 dat[2] = (session->total_message_size >> 8);
713 dat[3] = session->pkt.total;
714
715 if (session->skcb.addr.type == J1939_ETP) {
716 dat[0] = J1939_ETP_CMD_RTS;
717 dat[1] = (session->total_message_size >> 0);
718 dat[2] = (session->total_message_size >> 8);
719 dat[3] = (session->total_message_size >> 16);
720 dat[4] = (session->total_message_size >> 24);
721 } else if (j1939_cb_is_broadcast(&session->skcb)) {
722 dat[0] = J1939_TP_CMD_BAM;
723
724 session->pkt.tx = 0;
725 } else {
726 dat[0] = J1939_TP_CMD_RTS;
727 dat[4] = dat[3];
728 }
729
730 if (dat[0] == session->last_txcmd)
731
732 return 0;
733
734 ret = j1939_tp_tx_ctl(session, false, dat);
735 if (ret < 0)
736 return ret;
737
738 session->last_txcmd = dat[0];
739 if (dat[0] == J1939_TP_CMD_BAM) {
740 j1939_tp_schedule_txtimer(session, 50);
741 j1939_tp_set_rxtimeout(session, 250);
742 } else {
743 j1939_tp_set_rxtimeout(session, 1250);
744 }
745
746 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
747
748 return 0;
749}
750
751static int j1939_session_tx_dpo(struct j1939_session *session)
752{
753 unsigned int pkt;
754 u8 dat[8];
755 int ret;
756
757 memset(dat, 0xff, sizeof(dat));
758
759 dat[0] = J1939_ETP_CMD_DPO;
760 session->pkt.dpo = session->pkt.tx_acked;
761 pkt = session->pkt.dpo;
762 dat[1] = session->pkt.last - session->pkt.tx_acked;
763 dat[2] = (pkt >> 0);
764 dat[3] = (pkt >> 8);
765 dat[4] = (pkt >> 16);
766
767 ret = j1939_tp_tx_ctl(session, false, dat);
768 if (ret < 0)
769 return ret;
770
771 session->last_txcmd = dat[0];
772 j1939_tp_set_rxtimeout(session, 1250);
773 session->pkt.tx = session->pkt.tx_acked;
774
775 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
776
777 return 0;
778}
779
780static int j1939_session_tx_dat(struct j1939_session *session)
781{
782 struct j1939_priv *priv = session->priv;
783 struct j1939_sk_buff_cb *se_skcb;
784 int offset, pkt_done, pkt_end;
785 unsigned int len, pdelay;
786 struct sk_buff *se_skb;
787 const u8 *tpdat;
788 int ret = 0;
789 u8 dat[8];
790
791 se_skb = j1939_session_skb_get_by_offset(session, session->pkt.tx * 7);
792 if (!se_skb)
793 return -ENOBUFS;
794
795 se_skcb = j1939_skb_to_cb(se_skb);
796 tpdat = se_skb->data;
797 ret = 0;
798 pkt_done = 0;
799 if (session->skcb.addr.type != J1939_ETP &&
800 j1939_cb_is_broadcast(&session->skcb))
801 pkt_end = session->pkt.total;
802 else
803 pkt_end = session->pkt.last;
804
805 while (session->pkt.tx < pkt_end) {
806 dat[0] = session->pkt.tx - session->pkt.dpo + 1;
807 offset = (session->pkt.tx * 7) - se_skcb->offset;
808 len = se_skb->len - offset;
809 if (len > 7)
810 len = 7;
811
812 if (offset + len > se_skb->len) {
813 netdev_err_once(priv->ndev,
814 "%s: 0x%p: requested data outside of queued buffer: offset %i, len %i, pkt.tx: %i\n",
815 __func__, session, se_skcb->offset,
816 se_skb->len , session->pkt.tx);
817 ret = -EOVERFLOW;
818 goto out_free;
819 }
820
821 if (!len) {
822 ret = -ENOBUFS;
823 break;
824 }
825
826 memcpy(&dat[1], &tpdat[offset], len);
827 ret = j1939_tp_tx_dat(session, dat, len + 1);
828 if (ret < 0) {
829
830 if (ret != -ENOBUFS)
831 netdev_alert(priv->ndev,
832 "%s: 0x%p: queue data error: %i\n",
833 __func__, session, ret);
834 break;
835 }
836
837 session->last_txcmd = 0xff;
838 pkt_done++;
839 session->pkt.tx++;
840 pdelay = j1939_cb_is_broadcast(&session->skcb) ? 50 :
841 j1939_tp_packet_delay;
842
843 if (session->pkt.tx < session->pkt.total && pdelay) {
844 j1939_tp_schedule_txtimer(session, pdelay);
845 break;
846 }
847 }
848
849 if (pkt_done)
850 j1939_tp_set_rxtimeout(session, 250);
851
852 out_free:
853 if (ret)
854 kfree_skb(se_skb);
855 else
856 consume_skb(se_skb);
857
858 return ret;
859}
860
861static int j1939_xtp_txnext_transmiter(struct j1939_session *session)
862{
863 struct j1939_priv *priv = session->priv;
864 int ret = 0;
865
866 if (!j1939_tp_im_transmitter(&session->skcb)) {
867 netdev_alert(priv->ndev, "%s: 0x%p: called by not transmitter!\n",
868 __func__, session);
869 return -EINVAL;
870 }
871
872 switch (session->last_cmd) {
873 case 0:
874 ret = j1939_session_tx_rts(session);
875 break;
876
877 case J1939_ETP_CMD_CTS:
878 if (session->last_txcmd != J1939_ETP_CMD_DPO) {
879 ret = j1939_session_tx_dpo(session);
880 if (ret)
881 return ret;
882 }
883
884 fallthrough;
885 case J1939_TP_CMD_CTS:
886 case 0xff:
887 case J1939_ETP_CMD_DPO:
888 case J1939_TP_CMD_BAM:
889 ret = j1939_session_tx_dat(session);
890
891 break;
892 default:
893 netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n",
894 __func__, session, session->last_cmd);
895 }
896
897 return ret;
898}
899
900static int j1939_session_tx_cts(struct j1939_session *session)
901{
902 struct j1939_priv *priv = session->priv;
903 unsigned int pkt, len;
904 int ret;
905 u8 dat[8];
906
907 if (!j1939_sk_recv_match(priv, &session->skcb))
908 return -ENOENT;
909
910 len = session->pkt.total - session->pkt.rx;
911 len = min3(len, session->pkt.block, j1939_tp_block ?: 255);
912 memset(dat, 0xff, sizeof(dat));
913
914 if (session->skcb.addr.type == J1939_ETP) {
915 pkt = session->pkt.rx + 1;
916 dat[0] = J1939_ETP_CMD_CTS;
917 dat[1] = len;
918 dat[2] = (pkt >> 0);
919 dat[3] = (pkt >> 8);
920 dat[4] = (pkt >> 16);
921 } else {
922 dat[0] = J1939_TP_CMD_CTS;
923 dat[1] = len;
924 dat[2] = session->pkt.rx + 1;
925 }
926
927 if (dat[0] == session->last_txcmd)
928
929 return 0;
930
931 ret = j1939_tp_tx_ctl(session, true, dat);
932 if (ret < 0)
933 return ret;
934
935 if (len)
936
937 session->last_txcmd = dat[0];
938 j1939_tp_set_rxtimeout(session, 1250);
939
940 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
941
942 return 0;
943}
944
945static int j1939_session_tx_eoma(struct j1939_session *session)
946{
947 struct j1939_priv *priv = session->priv;
948 u8 dat[8];
949 int ret;
950
951 if (!j1939_sk_recv_match(priv, &session->skcb))
952 return -ENOENT;
953
954 memset(dat, 0xff, sizeof(dat));
955
956 if (session->skcb.addr.type == J1939_ETP) {
957 dat[0] = J1939_ETP_CMD_EOMA;
958 dat[1] = session->total_message_size >> 0;
959 dat[2] = session->total_message_size >> 8;
960 dat[3] = session->total_message_size >> 16;
961 dat[4] = session->total_message_size >> 24;
962 } else {
963 dat[0] = J1939_TP_CMD_EOMA;
964 dat[1] = session->total_message_size;
965 dat[2] = session->total_message_size >> 8;
966 dat[3] = session->pkt.total;
967 }
968
969 if (dat[0] == session->last_txcmd)
970
971 return 0;
972
973 ret = j1939_tp_tx_ctl(session, true, dat);
974 if (ret < 0)
975 return ret;
976
977 session->last_txcmd = dat[0];
978
979
980 j1939_tp_set_rxtimeout(session, 1250);
981
982 netdev_dbg(session->priv->ndev, "%p: 0x%p\n", __func__, session);
983
984 return 0;
985}
986
987static int j1939_xtp_txnext_receiver(struct j1939_session *session)
988{
989 struct j1939_priv *priv = session->priv;
990 int ret = 0;
991
992 if (!j1939_tp_im_receiver(&session->skcb)) {
993 netdev_alert(priv->ndev, "%s: 0x%p: called by not receiver!\n",
994 __func__, session);
995 return -EINVAL;
996 }
997
998 switch (session->last_cmd) {
999 case J1939_TP_CMD_RTS:
1000 case J1939_ETP_CMD_RTS:
1001 ret = j1939_session_tx_cts(session);
1002 break;
1003
1004 case J1939_ETP_CMD_CTS:
1005 case J1939_TP_CMD_CTS:
1006 case 0xff:
1007 case J1939_ETP_CMD_DPO:
1008 if ((session->skcb.addr.type == J1939_TP &&
1009 j1939_cb_is_broadcast(&session->skcb)))
1010 break;
1011
1012 if (session->pkt.rx >= session->pkt.total) {
1013 ret = j1939_session_tx_eoma(session);
1014 } else if (session->pkt.rx >= session->pkt.last) {
1015 session->last_txcmd = 0;
1016 ret = j1939_session_tx_cts(session);
1017 }
1018 break;
1019 default:
1020 netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n",
1021 __func__, session, session->last_cmd);
1022 }
1023
1024 return ret;
1025}
1026
1027static int j1939_simple_txnext(struct j1939_session *session)
1028{
1029 struct j1939_priv *priv = session->priv;
1030 struct sk_buff *se_skb = j1939_session_skb_get(session);
1031 struct sk_buff *skb;
1032 int ret;
1033
1034 if (!se_skb)
1035 return 0;
1036
1037 skb = skb_clone(se_skb, GFP_ATOMIC);
1038 if (!skb) {
1039 ret = -ENOMEM;
1040 goto out_free;
1041 }
1042
1043 can_skb_set_owner(skb, se_skb->sk);
1044
1045 j1939_tp_set_rxtimeout(session, J1939_SIMPLE_ECHO_TIMEOUT_MS);
1046
1047 ret = j1939_send_one(priv, skb);
1048 if (ret)
1049 goto out_free;
1050
1051 j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_SCHED);
1052 j1939_sk_queue_activate_next(session);
1053
1054 out_free:
1055 if (ret)
1056 kfree_skb(se_skb);
1057 else
1058 consume_skb(se_skb);
1059
1060 return ret;
1061}
1062
1063static bool j1939_session_deactivate_locked(struct j1939_session *session)
1064{
1065 bool active = false;
1066
1067 lockdep_assert_held(&session->priv->active_session_list_lock);
1068
1069 if (session->state >= J1939_SESSION_ACTIVE &&
1070 session->state < J1939_SESSION_ACTIVE_MAX) {
1071 active = true;
1072
1073 list_del_init(&session->active_session_list_entry);
1074 session->state = J1939_SESSION_DONE;
1075 j1939_session_put(session);
1076 }
1077
1078 return active;
1079}
1080
1081static bool j1939_session_deactivate(struct j1939_session *session)
1082{
1083 struct j1939_priv *priv = session->priv;
1084 bool active;
1085
1086 j1939_session_list_lock(priv);
1087
1088
1089
1090 WARN_ON_ONCE(kref_read(&session->kref) < 2);
1091 active = j1939_session_deactivate_locked(session);
1092 j1939_session_list_unlock(priv);
1093
1094 return active;
1095}
1096
1097static void
1098j1939_session_deactivate_activate_next(struct j1939_session *session)
1099{
1100 if (j1939_session_deactivate(session))
1101 j1939_sk_queue_activate_next(session);
1102}
1103
1104static void __j1939_session_cancel(struct j1939_session *session,
1105 enum j1939_xtp_abort err)
1106{
1107 struct j1939_priv *priv = session->priv;
1108
1109 WARN_ON_ONCE(!err);
1110 lockdep_assert_held(&session->priv->active_session_list_lock);
1111
1112 session->err = j1939_xtp_abort_to_errno(priv, err);
1113 session->state = J1939_SESSION_WAITING_ABORT;
1114
1115 if (!j1939_cb_is_broadcast(&session->skcb)) {
1116 j1939_xtp_tx_abort(priv, &session->skcb,
1117 !session->transmission,
1118 err, session->skcb.addr.pgn);
1119 }
1120
1121 if (session->sk)
1122 j1939_sk_send_loop_abort(session->sk, session->err);
1123 else
1124 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT);
1125}
1126
1127static void j1939_session_cancel(struct j1939_session *session,
1128 enum j1939_xtp_abort err)
1129{
1130 j1939_session_list_lock(session->priv);
1131
1132 if (session->state >= J1939_SESSION_ACTIVE &&
1133 session->state < J1939_SESSION_WAITING_ABORT) {
1134 j1939_tp_set_rxtimeout(session, J1939_XTP_ABORT_TIMEOUT_MS);
1135 __j1939_session_cancel(session, err);
1136 }
1137
1138 j1939_session_list_unlock(session->priv);
1139}
1140
1141static enum hrtimer_restart j1939_tp_txtimer(struct hrtimer *hrtimer)
1142{
1143 struct j1939_session *session =
1144 container_of(hrtimer, struct j1939_session, txtimer);
1145 struct j1939_priv *priv = session->priv;
1146 int ret = 0;
1147
1148 if (session->skcb.addr.type == J1939_SIMPLE) {
1149 ret = j1939_simple_txnext(session);
1150 } else {
1151 if (session->transmission)
1152 ret = j1939_xtp_txnext_transmiter(session);
1153 else
1154 ret = j1939_xtp_txnext_receiver(session);
1155 }
1156
1157 switch (ret) {
1158 case -ENOBUFS:
1159
1160 if (session->tx_retry < J1939_XTP_TX_RETRY_LIMIT) {
1161 session->tx_retry++;
1162 j1939_tp_schedule_txtimer(session,
1163 10 + prandom_u32_max(16));
1164 } else {
1165 netdev_alert(priv->ndev, "%s: 0x%p: tx retry count reached\n",
1166 __func__, session);
1167 session->err = -ENETUNREACH;
1168 j1939_session_rxtimer_cancel(session);
1169 j1939_session_deactivate_activate_next(session);
1170 }
1171 break;
1172 case -ENETDOWN:
1173
1174
1175
1176
1177
1178
1179 break;
1180 case -EOVERFLOW:
1181 j1939_session_cancel(session, J1939_XTP_ABORT_ECTS_TOO_BIG);
1182 break;
1183 case 0:
1184 session->tx_retry = 0;
1185 break;
1186 default:
1187 netdev_alert(priv->ndev, "%s: 0x%p: tx aborted with unknown reason: %i\n",
1188 __func__, session, ret);
1189 if (session->skcb.addr.type != J1939_SIMPLE) {
1190 j1939_session_cancel(session, J1939_XTP_ABORT_OTHER);
1191 } else {
1192 session->err = ret;
1193 j1939_session_rxtimer_cancel(session);
1194 j1939_session_deactivate_activate_next(session);
1195 }
1196 }
1197
1198 j1939_session_put(session);
1199
1200 return HRTIMER_NORESTART;
1201}
1202
1203static void j1939_session_completed(struct j1939_session *session)
1204{
1205 struct sk_buff *se_skb;
1206
1207 if (!session->transmission) {
1208 se_skb = j1939_session_skb_get(session);
1209
1210 j1939_sk_recv(session->priv, se_skb);
1211 consume_skb(se_skb);
1212 }
1213
1214 j1939_session_deactivate_activate_next(session);
1215}
1216
1217static enum hrtimer_restart j1939_tp_rxtimer(struct hrtimer *hrtimer)
1218{
1219 struct j1939_session *session = container_of(hrtimer,
1220 struct j1939_session,
1221 rxtimer);
1222 struct j1939_priv *priv = session->priv;
1223
1224 if (session->state == J1939_SESSION_WAITING_ABORT) {
1225 netdev_alert(priv->ndev, "%s: 0x%p: abort rx timeout. Force session deactivation\n",
1226 __func__, session);
1227
1228 j1939_session_deactivate_activate_next(session);
1229
1230 } else if (session->skcb.addr.type == J1939_SIMPLE) {
1231 netdev_alert(priv->ndev, "%s: 0x%p: Timeout. Failed to send simple message.\n",
1232 __func__, session);
1233
1234
1235
1236
1237 session->err = -ETIME;
1238 j1939_session_deactivate(session);
1239 } else {
1240 j1939_session_list_lock(session->priv);
1241 if (session->state >= J1939_SESSION_ACTIVE &&
1242 session->state < J1939_SESSION_ACTIVE_MAX) {
1243 netdev_alert(priv->ndev, "%s: 0x%p: rx timeout, send abort\n",
1244 __func__, session);
1245 j1939_session_get(session);
1246 hrtimer_start(&session->rxtimer,
1247 ms_to_ktime(J1939_XTP_ABORT_TIMEOUT_MS),
1248 HRTIMER_MODE_REL_SOFT);
1249 __j1939_session_cancel(session, J1939_XTP_ABORT_TIMEOUT);
1250 }
1251 j1939_session_list_unlock(session->priv);
1252 }
1253
1254 j1939_session_put(session);
1255
1256 return HRTIMER_NORESTART;
1257}
1258
1259static bool j1939_xtp_rx_cmd_bad_pgn(struct j1939_session *session,
1260 const struct sk_buff *skb)
1261{
1262 const struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1263 pgn_t pgn = j1939_xtp_ctl_to_pgn(skb->data);
1264 struct j1939_priv *priv = session->priv;
1265 enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT;
1266 u8 cmd = skb->data[0];
1267
1268 if (session->skcb.addr.pgn == pgn)
1269 return false;
1270
1271 switch (cmd) {
1272 case J1939_TP_CMD_BAM:
1273 abort = J1939_XTP_NO_ABORT;
1274 break;
1275
1276 case J1939_ETP_CMD_RTS:
1277 fallthrough;
1278 case J1939_TP_CMD_RTS:
1279 abort = J1939_XTP_ABORT_BUSY;
1280 break;
1281
1282 case J1939_ETP_CMD_CTS:
1283 fallthrough;
1284 case J1939_TP_CMD_CTS:
1285 abort = J1939_XTP_ABORT_ECTS_UNXPECTED_PGN;
1286 break;
1287
1288 case J1939_ETP_CMD_DPO:
1289 abort = J1939_XTP_ABORT_BAD_EDPO_PGN;
1290 break;
1291
1292 case J1939_ETP_CMD_EOMA:
1293 fallthrough;
1294 case J1939_TP_CMD_EOMA:
1295 abort = J1939_XTP_ABORT_OTHER;
1296 break;
1297
1298 case J1939_ETP_CMD_ABORT:
1299 abort = J1939_XTP_NO_ABORT;
1300 break;
1301
1302 default:
1303 WARN_ON_ONCE(1);
1304 break;
1305 }
1306
1307 netdev_warn(priv->ndev, "%s: 0x%p: CMD 0x%02x with PGN 0x%05x for running session with different PGN 0x%05x.\n",
1308 __func__, session, cmd, pgn, session->skcb.addr.pgn);
1309 if (abort != J1939_XTP_NO_ABORT)
1310 j1939_xtp_tx_abort(priv, skcb, true, abort, pgn);
1311
1312 return true;
1313}
1314
1315static void j1939_xtp_rx_abort_one(struct j1939_priv *priv, struct sk_buff *skb,
1316 bool reverse, bool transmitter)
1317{
1318 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1319 struct j1939_session *session;
1320 u8 abort = skb->data[1];
1321
1322 session = j1939_session_get_by_addr(priv, &skcb->addr, reverse,
1323 transmitter);
1324 if (!session)
1325 return;
1326
1327 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1328 goto abort_put;
1329
1330 netdev_info(priv->ndev, "%s: 0x%p: 0x%05x: (%u) %s\n", __func__,
1331 session, j1939_xtp_ctl_to_pgn(skb->data), abort,
1332 j1939_xtp_abort_to_str(abort));
1333
1334 j1939_session_timers_cancel(session);
1335 session->err = j1939_xtp_abort_to_errno(priv, abort);
1336 if (session->sk)
1337 j1939_sk_send_loop_abort(session->sk, session->err);
1338 else
1339 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT);
1340 j1939_session_deactivate_activate_next(session);
1341
1342abort_put:
1343 j1939_session_put(session);
1344}
1345
1346
1347static void
1348j1939_xtp_rx_abort(struct j1939_priv *priv, struct sk_buff *skb,
1349 bool transmitter)
1350{
1351 j1939_xtp_rx_abort_one(priv, skb, false, transmitter);
1352 j1939_xtp_rx_abort_one(priv, skb, true, transmitter);
1353}
1354
1355static void
1356j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb)
1357{
1358 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1359 const u8 *dat;
1360 int len;
1361
1362 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1363 return;
1364
1365 dat = skb->data;
1366
1367 if (skcb->addr.type == J1939_ETP)
1368 len = j1939_etp_ctl_to_size(dat);
1369 else
1370 len = j1939_tp_ctl_to_size(dat);
1371
1372 if (session->total_message_size != len) {
1373 netdev_warn_once(session->priv->ndev,
1374 "%s: 0x%p: Incorrect size. Expected: %i; got: %i.\n",
1375 __func__, session, session->total_message_size,
1376 len);
1377 }
1378
1379 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
1380
1381 session->pkt.tx_acked = session->pkt.total;
1382 j1939_session_timers_cancel(session);
1383
1384 j1939_session_completed(session);
1385}
1386
1387static void
1388j1939_xtp_rx_eoma(struct j1939_priv *priv, struct sk_buff *skb,
1389 bool transmitter)
1390{
1391 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1392 struct j1939_session *session;
1393
1394 session = j1939_session_get_by_addr(priv, &skcb->addr, true,
1395 transmitter);
1396 if (!session)
1397 return;
1398
1399 j1939_xtp_rx_eoma_one(session, skb);
1400 j1939_session_put(session);
1401}
1402
1403static void
1404j1939_xtp_rx_cts_one(struct j1939_session *session, struct sk_buff *skb)
1405{
1406 enum j1939_xtp_abort err = J1939_XTP_ABORT_FAULT;
1407 unsigned int pkt;
1408 const u8 *dat;
1409
1410 dat = skb->data;
1411
1412 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1413 return;
1414
1415 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
1416
1417 if (session->last_cmd == dat[0]) {
1418 err = J1939_XTP_ABORT_DUP_SEQ;
1419 goto out_session_cancel;
1420 }
1421
1422 if (session->skcb.addr.type == J1939_ETP)
1423 pkt = j1939_etp_ctl_to_packet(dat);
1424 else
1425 pkt = dat[2];
1426
1427 if (!pkt)
1428 goto out_session_cancel;
1429 else if (dat[1] > session->pkt.block )
1430 goto out_session_cancel;
1431
1432
1433 session->pkt.tx_acked = pkt - 1;
1434 j1939_session_skb_drop_old(session);
1435 session->pkt.last = session->pkt.tx_acked + dat[1];
1436 if (session->pkt.last > session->pkt.total)
1437
1438 session->pkt.last = session->pkt.total;
1439
1440 session->pkt.tx = session->pkt.tx_acked;
1441
1442 session->last_cmd = dat[0];
1443 if (dat[1]) {
1444 j1939_tp_set_rxtimeout(session, 1250);
1445 if (session->transmission) {
1446 if (session->pkt.tx_acked)
1447 j1939_sk_errqueue(session,
1448 J1939_ERRQUEUE_TX_SCHED);
1449 j1939_session_txtimer_cancel(session);
1450 j1939_tp_schedule_txtimer(session, 0);
1451 }
1452 } else {
1453
1454 j1939_tp_set_rxtimeout(session, 550);
1455 }
1456 return;
1457
1458 out_session_cancel:
1459 j1939_session_timers_cancel(session);
1460 j1939_session_cancel(session, err);
1461}
1462
1463static void
1464j1939_xtp_rx_cts(struct j1939_priv *priv, struct sk_buff *skb, bool transmitter)
1465{
1466 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1467 struct j1939_session *session;
1468
1469 session = j1939_session_get_by_addr(priv, &skcb->addr, true,
1470 transmitter);
1471 if (!session)
1472 return;
1473 j1939_xtp_rx_cts_one(session, skb);
1474 j1939_session_put(session);
1475}
1476
1477static struct j1939_session *j1939_session_new(struct j1939_priv *priv,
1478 struct sk_buff *skb, size_t size)
1479{
1480 struct j1939_session *session;
1481 struct j1939_sk_buff_cb *skcb;
1482
1483 session = kzalloc(sizeof(*session), gfp_any());
1484 if (!session)
1485 return NULL;
1486
1487 INIT_LIST_HEAD(&session->active_session_list_entry);
1488 INIT_LIST_HEAD(&session->sk_session_queue_entry);
1489 kref_init(&session->kref);
1490
1491 j1939_priv_get(priv);
1492 session->priv = priv;
1493 session->total_message_size = size;
1494 session->state = J1939_SESSION_NEW;
1495
1496 skb_queue_head_init(&session->skb_queue);
1497 skb_queue_tail(&session->skb_queue, skb);
1498
1499 skcb = j1939_skb_to_cb(skb);
1500 memcpy(&session->skcb, skcb, sizeof(session->skcb));
1501
1502 hrtimer_init(&session->txtimer, CLOCK_MONOTONIC,
1503 HRTIMER_MODE_REL_SOFT);
1504 session->txtimer.function = j1939_tp_txtimer;
1505 hrtimer_init(&session->rxtimer, CLOCK_MONOTONIC,
1506 HRTIMER_MODE_REL_SOFT);
1507 session->rxtimer.function = j1939_tp_rxtimer;
1508
1509 netdev_dbg(priv->ndev, "%s: 0x%p: sa: %02x, da: %02x\n",
1510 __func__, session, skcb->addr.sa, skcb->addr.da);
1511
1512 return session;
1513}
1514
1515static struct
1516j1939_session *j1939_session_fresh_new(struct j1939_priv *priv,
1517 int size,
1518 const struct j1939_sk_buff_cb *rel_skcb)
1519{
1520 struct sk_buff *skb;
1521 struct j1939_sk_buff_cb *skcb;
1522 struct j1939_session *session;
1523
1524 skb = alloc_skb(size + sizeof(struct can_skb_priv), GFP_ATOMIC);
1525 if (unlikely(!skb))
1526 return NULL;
1527
1528 skb->dev = priv->ndev;
1529 can_skb_reserve(skb);
1530 can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
1531 can_skb_prv(skb)->skbcnt = 0;
1532 skcb = j1939_skb_to_cb(skb);
1533 memcpy(skcb, rel_skcb, sizeof(*skcb));
1534
1535 session = j1939_session_new(priv, skb, size);
1536 if (!session) {
1537 kfree_skb(skb);
1538 return NULL;
1539 }
1540
1541
1542 skb_put(skb, size);
1543
1544 return session;
1545}
1546
1547int j1939_session_activate(struct j1939_session *session)
1548{
1549 struct j1939_priv *priv = session->priv;
1550 struct j1939_session *active = NULL;
1551 int ret = 0;
1552
1553 j1939_session_list_lock(priv);
1554 if (session->skcb.addr.type != J1939_SIMPLE)
1555 active = j1939_session_get_by_addr_locked(priv,
1556 &priv->active_session_list,
1557 &session->skcb.addr, false,
1558 session->transmission);
1559 if (active) {
1560 j1939_session_put(active);
1561 ret = -EAGAIN;
1562 } else {
1563 WARN_ON_ONCE(session->state != J1939_SESSION_NEW);
1564 list_add_tail(&session->active_session_list_entry,
1565 &priv->active_session_list);
1566 j1939_session_get(session);
1567 session->state = J1939_SESSION_ACTIVE;
1568
1569 netdev_dbg(session->priv->ndev, "%s: 0x%p\n",
1570 __func__, session);
1571 }
1572 j1939_session_list_unlock(priv);
1573
1574 return ret;
1575}
1576
1577static struct
1578j1939_session *j1939_xtp_rx_rts_session_new(struct j1939_priv *priv,
1579 struct sk_buff *skb)
1580{
1581 enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT;
1582 struct j1939_sk_buff_cb skcb = *j1939_skb_to_cb(skb);
1583 struct j1939_session *session;
1584 const u8 *dat;
1585 pgn_t pgn;
1586 int len;
1587
1588 netdev_dbg(priv->ndev, "%s\n", __func__);
1589
1590 dat = skb->data;
1591 pgn = j1939_xtp_ctl_to_pgn(dat);
1592 skcb.addr.pgn = pgn;
1593
1594 if (!j1939_sk_recv_match(priv, &skcb))
1595 return NULL;
1596
1597 if (skcb.addr.type == J1939_ETP) {
1598 len = j1939_etp_ctl_to_size(dat);
1599 if (len > J1939_MAX_ETP_PACKET_SIZE)
1600 abort = J1939_XTP_ABORT_FAULT;
1601 else if (len > priv->tp_max_packet_size)
1602 abort = J1939_XTP_ABORT_RESOURCE;
1603 else if (len <= J1939_MAX_TP_PACKET_SIZE)
1604 abort = J1939_XTP_ABORT_FAULT;
1605 } else {
1606 len = j1939_tp_ctl_to_size(dat);
1607 if (len > J1939_MAX_TP_PACKET_SIZE)
1608 abort = J1939_XTP_ABORT_FAULT;
1609 else if (len > priv->tp_max_packet_size)
1610 abort = J1939_XTP_ABORT_RESOURCE;
1611 else if (len < J1939_MIN_TP_PACKET_SIZE)
1612 abort = J1939_XTP_ABORT_FAULT;
1613 }
1614
1615 if (abort != J1939_XTP_NO_ABORT) {
1616 j1939_xtp_tx_abort(priv, &skcb, true, abort, pgn);
1617 return NULL;
1618 }
1619
1620 session = j1939_session_fresh_new(priv, len, &skcb);
1621 if (!session) {
1622 j1939_xtp_tx_abort(priv, &skcb, true,
1623 J1939_XTP_ABORT_RESOURCE, pgn);
1624 return NULL;
1625 }
1626
1627
1628 session->pkt.total = (len + 6) / 7;
1629 session->pkt.block = 0xff;
1630 if (skcb.addr.type != J1939_ETP) {
1631 if (dat[3] != session->pkt.total)
1632 netdev_alert(priv->ndev, "%s: 0x%p: strange total, %u != %u\n",
1633 __func__, session, session->pkt.total,
1634 dat[3]);
1635 session->pkt.total = dat[3];
1636 session->pkt.block = min(dat[3], dat[4]);
1637 }
1638
1639 session->pkt.rx = 0;
1640 session->pkt.tx = 0;
1641
1642 session->tskey = priv->rx_tskey++;
1643 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_RTS);
1644
1645 WARN_ON_ONCE(j1939_session_activate(session));
1646
1647 return session;
1648}
1649
1650static int j1939_xtp_rx_rts_session_active(struct j1939_session *session,
1651 struct sk_buff *skb)
1652{
1653 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1654 struct j1939_priv *priv = session->priv;
1655
1656 if (!session->transmission) {
1657 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1658 return -EBUSY;
1659
1660
1661 j1939_session_timers_cancel(session);
1662 j1939_session_cancel(session, J1939_XTP_ABORT_BUSY);
1663 }
1664
1665 if (session->last_cmd != 0) {
1666
1667 netdev_alert(priv->ndev, "%s: 0x%p: connection exists (%02x %02x). last cmd: %x\n",
1668 __func__, session, skcb->addr.sa, skcb->addr.da,
1669 session->last_cmd);
1670
1671 j1939_session_timers_cancel(session);
1672 j1939_session_cancel(session, J1939_XTP_ABORT_BUSY);
1673
1674 return -EBUSY;
1675 }
1676
1677 if (session->skcb.addr.sa != skcb->addr.sa ||
1678 session->skcb.addr.da != skcb->addr.da)
1679 netdev_warn(priv->ndev, "%s: 0x%p: session->skcb.addr.sa=0x%02x skcb->addr.sa=0x%02x session->skcb.addr.da=0x%02x skcb->addr.da=0x%02x\n",
1680 __func__, session,
1681 session->skcb.addr.sa, skcb->addr.sa,
1682 session->skcb.addr.da, skcb->addr.da);
1683
1684
1685
1686
1687 session->skcb.addr.sa = skcb->addr.sa;
1688 session->skcb.addr.da = skcb->addr.da;
1689
1690 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
1691
1692 return 0;
1693}
1694
1695static void j1939_xtp_rx_rts(struct j1939_priv *priv, struct sk_buff *skb,
1696 bool transmitter)
1697{
1698 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1699 struct j1939_session *session;
1700 u8 cmd = skb->data[0];
1701
1702 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1703 transmitter);
1704
1705 if (!session) {
1706 if (transmitter) {
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722 return;
1723 }
1724 session = j1939_xtp_rx_rts_session_new(priv, skb);
1725 if (!session) {
1726 if (cmd == J1939_TP_CMD_BAM && j1939_sk_recv_match(priv, skcb))
1727 netdev_info(priv->ndev, "%s: failed to create TP BAM session\n",
1728 __func__);
1729 return;
1730 }
1731 } else {
1732 if (j1939_xtp_rx_rts_session_active(session, skb)) {
1733 j1939_session_put(session);
1734 return;
1735 }
1736 }
1737 session->last_cmd = cmd;
1738
1739 if (cmd == J1939_TP_CMD_BAM) {
1740 if (!session->transmission)
1741 j1939_tp_set_rxtimeout(session, 750);
1742 } else {
1743 if (!session->transmission) {
1744 j1939_session_txtimer_cancel(session);
1745 j1939_tp_schedule_txtimer(session, 0);
1746 }
1747 j1939_tp_set_rxtimeout(session, 1250);
1748 }
1749
1750 j1939_session_put(session);
1751}
1752
1753static void j1939_xtp_rx_dpo_one(struct j1939_session *session,
1754 struct sk_buff *skb)
1755{
1756 const u8 *dat = skb->data;
1757
1758 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1759 return;
1760
1761 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
1762
1763
1764 session->pkt.dpo = j1939_etp_ctl_to_packet(skb->data);
1765 session->last_cmd = dat[0];
1766 j1939_tp_set_rxtimeout(session, 750);
1767
1768 if (!session->transmission)
1769 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_DPO);
1770}
1771
1772static void j1939_xtp_rx_dpo(struct j1939_priv *priv, struct sk_buff *skb,
1773 bool transmitter)
1774{
1775 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1776 struct j1939_session *session;
1777
1778 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1779 transmitter);
1780 if (!session) {
1781 netdev_info(priv->ndev,
1782 "%s: no connection found\n", __func__);
1783 return;
1784 }
1785
1786 j1939_xtp_rx_dpo_one(session, skb);
1787 j1939_session_put(session);
1788}
1789
1790static void j1939_xtp_rx_dat_one(struct j1939_session *session,
1791 struct sk_buff *skb)
1792{
1793 enum j1939_xtp_abort abort = J1939_XTP_ABORT_FAULT;
1794 struct j1939_priv *priv = session->priv;
1795 struct j1939_sk_buff_cb *skcb, *se_skcb;
1796 struct sk_buff *se_skb = NULL;
1797 const u8 *dat;
1798 u8 *tpdat;
1799 int offset;
1800 int nbytes;
1801 bool final = false;
1802 bool remain = false;
1803 bool do_cts_eoma = false;
1804 int packet;
1805
1806 skcb = j1939_skb_to_cb(skb);
1807 dat = skb->data;
1808 if (skb->len != 8) {
1809
1810 abort = J1939_XTP_ABORT_UNEXPECTED_DATA;
1811 goto out_session_cancel;
1812 }
1813
1814 switch (session->last_cmd) {
1815 case 0xff:
1816 break;
1817 case J1939_ETP_CMD_DPO:
1818 if (skcb->addr.type == J1939_ETP)
1819 break;
1820 fallthrough;
1821 case J1939_TP_CMD_BAM:
1822 fallthrough;
1823 case J1939_TP_CMD_CTS:
1824 if (skcb->addr.type != J1939_ETP)
1825 break;
1826 fallthrough;
1827 default:
1828 netdev_info(priv->ndev, "%s: 0x%p: last %02x\n", __func__,
1829 session, session->last_cmd);
1830 goto out_session_cancel;
1831 }
1832
1833 packet = (dat[0] - 1 + session->pkt.dpo);
1834 if (packet > session->pkt.total ||
1835 (session->pkt.rx + 1) > session->pkt.total) {
1836 netdev_info(priv->ndev, "%s: 0x%p: should have been completed\n",
1837 __func__, session);
1838 goto out_session_cancel;
1839 }
1840
1841 se_skb = j1939_session_skb_get_by_offset(session, packet * 7);
1842 if (!se_skb) {
1843 netdev_warn(priv->ndev, "%s: 0x%p: no skb found\n", __func__,
1844 session);
1845 goto out_session_cancel;
1846 }
1847
1848 se_skcb = j1939_skb_to_cb(se_skb);
1849 offset = packet * 7 - se_skcb->offset;
1850 nbytes = se_skb->len - offset;
1851 if (nbytes > 7)
1852 nbytes = 7;
1853 if (nbytes <= 0 || (nbytes + 1) > skb->len) {
1854 netdev_info(priv->ndev, "%s: 0x%p: nbytes %i, len %i\n",
1855 __func__, session, nbytes, skb->len);
1856 goto out_session_cancel;
1857 }
1858
1859 tpdat = se_skb->data;
1860 if (!session->transmission) {
1861 memcpy(&tpdat[offset], &dat[1], nbytes);
1862 } else {
1863 int err;
1864
1865 err = memcmp(&tpdat[offset], &dat[1], nbytes);
1866 if (err)
1867 netdev_err_once(priv->ndev,
1868 "%s: 0x%p: Data of RX-looped back packet (%*ph) doesn't match TX data (%*ph)!\n",
1869 __func__, session,
1870 nbytes, &dat[1],
1871 nbytes, &tpdat[offset]);
1872 }
1873
1874 if (packet == session->pkt.rx)
1875 session->pkt.rx++;
1876
1877 if (se_skcb->addr.type != J1939_ETP &&
1878 j1939_cb_is_broadcast(&session->skcb)) {
1879 if (session->pkt.rx >= session->pkt.total)
1880 final = true;
1881 else
1882 remain = true;
1883 } else {
1884
1885 if (session->pkt.rx >= session->pkt.last)
1886 do_cts_eoma = true;
1887 }
1888
1889 if (final) {
1890 j1939_session_timers_cancel(session);
1891 j1939_session_completed(session);
1892 } else if (remain) {
1893 if (!session->transmission)
1894 j1939_tp_set_rxtimeout(session, 750);
1895 } else if (do_cts_eoma) {
1896 j1939_tp_set_rxtimeout(session, 1250);
1897 if (!session->transmission)
1898 j1939_tp_schedule_txtimer(session, 0);
1899 } else {
1900 j1939_tp_set_rxtimeout(session, 750);
1901 }
1902 session->last_cmd = 0xff;
1903 consume_skb(se_skb);
1904 j1939_session_put(session);
1905
1906 return;
1907
1908 out_session_cancel:
1909 kfree_skb(se_skb);
1910 j1939_session_timers_cancel(session);
1911 j1939_session_cancel(session, abort);
1912 j1939_session_put(session);
1913}
1914
1915static void j1939_xtp_rx_dat(struct j1939_priv *priv, struct sk_buff *skb)
1916{
1917 struct j1939_sk_buff_cb *skcb;
1918 struct j1939_session *session;
1919
1920 skcb = j1939_skb_to_cb(skb);
1921
1922 if (j1939_tp_im_transmitter(skcb)) {
1923 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1924 true);
1925 if (!session)
1926 netdev_info(priv->ndev, "%s: no tx connection found\n",
1927 __func__);
1928 else
1929 j1939_xtp_rx_dat_one(session, skb);
1930 }
1931
1932 if (j1939_tp_im_receiver(skcb)) {
1933 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1934 false);
1935 if (!session)
1936 netdev_info(priv->ndev, "%s: no rx connection found\n",
1937 __func__);
1938 else
1939 j1939_xtp_rx_dat_one(session, skb);
1940 }
1941
1942 if (j1939_cb_is_broadcast(skcb)) {
1943 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1944 false);
1945 if (session)
1946 j1939_xtp_rx_dat_one(session, skb);
1947 }
1948}
1949
1950
1951struct j1939_session *j1939_tp_send(struct j1939_priv *priv,
1952 struct sk_buff *skb, size_t size)
1953{
1954 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1955 struct j1939_session *session;
1956 int ret;
1957
1958 if (skcb->addr.pgn == J1939_TP_PGN_DAT ||
1959 skcb->addr.pgn == J1939_TP_PGN_CTL ||
1960 skcb->addr.pgn == J1939_ETP_PGN_DAT ||
1961 skcb->addr.pgn == J1939_ETP_PGN_CTL)
1962
1963 return ERR_PTR(-EDOM);
1964
1965 if (size > priv->tp_max_packet_size)
1966 return ERR_PTR(-EMSGSIZE);
1967
1968 if (size <= 8)
1969 skcb->addr.type = J1939_SIMPLE;
1970 else if (size > J1939_MAX_TP_PACKET_SIZE)
1971 skcb->addr.type = J1939_ETP;
1972 else
1973 skcb->addr.type = J1939_TP;
1974
1975 if (skcb->addr.type == J1939_ETP &&
1976 j1939_cb_is_broadcast(skcb))
1977 return ERR_PTR(-EDESTADDRREQ);
1978
1979
1980 ret = j1939_ac_fixup(priv, skb);
1981 if (unlikely(ret))
1982 return ERR_PTR(ret);
1983
1984
1985 if (j1939_address_is_unicast(skcb->addr.da) &&
1986 priv->ents[skcb->addr.da].nusers)
1987 skcb->flags |= J1939_ECU_LOCAL_DST;
1988
1989
1990 skcb->flags |= J1939_ECU_LOCAL_SRC;
1991
1992
1993 session = j1939_session_new(priv, skb, size);
1994 if (!session)
1995 return ERR_PTR(-ENOMEM);
1996
1997
1998 sock_hold(skb->sk);
1999 session->sk = skb->sk;
2000 session->transmission = true;
2001 session->pkt.total = (size + 6) / 7;
2002 session->pkt.block = skcb->addr.type == J1939_ETP ? 255 :
2003 min(j1939_tp_block ?: 255, session->pkt.total);
2004
2005 if (j1939_cb_is_broadcast(&session->skcb))
2006
2007 session->pkt.last = session->pkt.total;
2008
2009 skcb->tskey = session->sk->sk_tskey++;
2010 session->tskey = skcb->tskey;
2011
2012 return session;
2013}
2014
2015static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb)
2016{
2017 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
2018 int extd = J1939_TP;
2019 u8 cmd = skb->data[0];
2020
2021 switch (cmd) {
2022 case J1939_ETP_CMD_RTS:
2023 extd = J1939_ETP;
2024 fallthrough;
2025 case J1939_TP_CMD_BAM:
2026 fallthrough;
2027 case J1939_TP_CMD_RTS:
2028 if (skcb->addr.type != extd)
2029 return;
2030
2031 if (cmd == J1939_TP_CMD_RTS && j1939_cb_is_broadcast(skcb)) {
2032 netdev_alert(priv->ndev, "%s: rts without destination (%02x)\n",
2033 __func__, skcb->addr.sa);
2034 return;
2035 }
2036
2037 if (j1939_tp_im_transmitter(skcb))
2038 j1939_xtp_rx_rts(priv, skb, true);
2039
2040 if (j1939_tp_im_receiver(skcb) || j1939_cb_is_broadcast(skcb))
2041 j1939_xtp_rx_rts(priv, skb, false);
2042
2043 break;
2044
2045 case J1939_ETP_CMD_CTS:
2046 extd = J1939_ETP;
2047 fallthrough;
2048 case J1939_TP_CMD_CTS:
2049 if (skcb->addr.type != extd)
2050 return;
2051
2052 if (j1939_tp_im_transmitter(skcb))
2053 j1939_xtp_rx_cts(priv, skb, false);
2054
2055 if (j1939_tp_im_receiver(skcb))
2056 j1939_xtp_rx_cts(priv, skb, true);
2057
2058 break;
2059
2060 case J1939_ETP_CMD_DPO:
2061 if (skcb->addr.type != J1939_ETP)
2062 return;
2063
2064 if (j1939_tp_im_transmitter(skcb))
2065 j1939_xtp_rx_dpo(priv, skb, true);
2066
2067 if (j1939_tp_im_receiver(skcb))
2068 j1939_xtp_rx_dpo(priv, skb, false);
2069
2070 break;
2071
2072 case J1939_ETP_CMD_EOMA:
2073 extd = J1939_ETP;
2074 fallthrough;
2075 case J1939_TP_CMD_EOMA:
2076 if (skcb->addr.type != extd)
2077 return;
2078
2079 if (j1939_tp_im_transmitter(skcb))
2080 j1939_xtp_rx_eoma(priv, skb, false);
2081
2082 if (j1939_tp_im_receiver(skcb))
2083 j1939_xtp_rx_eoma(priv, skb, true);
2084
2085 break;
2086
2087 case J1939_ETP_CMD_ABORT:
2088 if (j1939_tp_im_transmitter(skcb))
2089 j1939_xtp_rx_abort(priv, skb, true);
2090
2091 if (j1939_tp_im_receiver(skcb))
2092 j1939_xtp_rx_abort(priv, skb, false);
2093
2094 break;
2095 default:
2096 return;
2097 }
2098}
2099
2100int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb)
2101{
2102 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
2103
2104 if (!j1939_tp_im_involved_anydir(skcb) && !j1939_cb_is_broadcast(skcb))
2105 return 0;
2106
2107 switch (skcb->addr.pgn) {
2108 case J1939_ETP_PGN_DAT:
2109 skcb->addr.type = J1939_ETP;
2110 fallthrough;
2111 case J1939_TP_PGN_DAT:
2112 j1939_xtp_rx_dat(priv, skb);
2113 break;
2114
2115 case J1939_ETP_PGN_CTL:
2116 skcb->addr.type = J1939_ETP;
2117 fallthrough;
2118 case J1939_TP_PGN_CTL:
2119 if (skb->len < 8)
2120 return 0;
2121
2122 j1939_tp_cmd_recv(priv, skb);
2123 break;
2124 default:
2125 return 0;
2126 }
2127 return 1;
2128}
2129
2130void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb)
2131{
2132 struct j1939_session *session;
2133
2134 if (!skb->sk)
2135 return;
2136
2137 if (skb->sk->sk_family != AF_CAN ||
2138 skb->sk->sk_protocol != CAN_J1939)
2139 return;
2140
2141 j1939_session_list_lock(priv);
2142 session = j1939_session_get_simple(priv, skb);
2143 j1939_session_list_unlock(priv);
2144 if (!session) {
2145 netdev_warn(priv->ndev,
2146 "%s: Received already invalidated message\n",
2147 __func__);
2148 return;
2149 }
2150
2151 j1939_session_timers_cancel(session);
2152 j1939_session_deactivate(session);
2153 j1939_session_put(session);
2154}
2155
2156int j1939_cancel_active_session(struct j1939_priv *priv, struct sock *sk)
2157{
2158 struct j1939_session *session, *saved;
2159
2160 netdev_dbg(priv->ndev, "%s, sk: %p\n", __func__, sk);
2161 j1939_session_list_lock(priv);
2162 list_for_each_entry_safe(session, saved,
2163 &priv->active_session_list,
2164 active_session_list_entry) {
2165 if (!sk || sk == session->sk) {
2166 if (hrtimer_try_to_cancel(&session->txtimer) == 1)
2167 j1939_session_put(session);
2168 if (hrtimer_try_to_cancel(&session->rxtimer) == 1)
2169 j1939_session_put(session);
2170
2171 session->err = ESHUTDOWN;
2172 j1939_session_deactivate_locked(session);
2173 }
2174 }
2175 j1939_session_list_unlock(priv);
2176 return NOTIFY_DONE;
2177}
2178
2179void j1939_tp_init(struct j1939_priv *priv)
2180{
2181 spin_lock_init(&priv->active_session_list_lock);
2182 INIT_LIST_HEAD(&priv->active_session_list);
2183 priv->tp_max_packet_size = J1939_MAX_ETP_PACKET_SIZE;
2184}
2185
