1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2010-2011 EIA Electronics,
3 // Kurt Van Dijck <kurt.van.dijck@eia.be>
4 // Copyright (c) 2018 Protonic,
5 // Robin van der Gracht <robin@protonic.nl>
6 // Copyright (c) 2017-2019 Pengutronix,
7 // Marc Kleine-Budde <kernel@pengutronix.de>
8 // Copyright (c) 2017-2019 Pengutronix,
9 // Oleksij Rempel <kernel@pengutronix.de>
11 #include <linux/can/skb.h>
13 #include "j1939-priv.h"
15 #define J1939_XTP_TX_RETRY_LIMIT 100
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
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
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
34 enum j1939_xtp_abort {
35 J1939_XTP_NO_ABORT = 0,
36 J1939_XTP_ABORT_BUSY = 1,
37 /* Already in one or more connection managed sessions and
38 * cannot support another.
41 * Operation already in progress
44 J1939_XTP_ABORT_RESOURCE = 2,
45 /* System resources were needed for another task so this
46 * connection managed session was terminated.
49 * The socket type requires that message be sent atomically,
50 * and the size of the message to be sent made this
54 J1939_XTP_ABORT_TIMEOUT = 3,
55 /* A timeout occurred and this is the connection abort to
59 * The destination host cannot be reached (probably because
60 * the host is down or a remote router cannot reach it).
63 J1939_XTP_ABORT_GENERIC = 4,
64 /* CTS messages received when data transfer is in progress
70 J1939_XTP_ABORT_FAULT = 5,
71 /* Maximal retransmit request limit reached
74 * State not recoverable
77 J1939_XTP_ABORT_UNEXPECTED_DATA = 6,
78 /* Unexpected data transfer packet
81 * Transport endpoint is not connected
84 J1939_XTP_ABORT_BAD_SEQ = 7,
85 /* Bad sequence number (and software is not able to recover)
88 * Illegal byte sequence
91 J1939_XTP_ABORT_DUP_SEQ = 8,
92 /* Duplicate sequence number (and software is not able to
96 J1939_XTP_ABORT_EDPO_UNEXPECTED = 9,
97 /* Unexpected EDPO packet (ETP) or Message size > 1785 bytes
101 J1939_XTP_ABORT_BAD_EDPO_PGN = 10,
102 /* Unexpected EDPO PGN (PGN in EDPO is bad) */
104 J1939_XTP_ABORT_EDPO_OUTOF_CTS = 11,
105 /* EDPO number of packets is greater than CTS */
107 J1939_XTP_ABORT_BAD_EDPO_OFFSET = 12,
108 /* Bad EDPO offset */
110 J1939_XTP_ABORT_OTHER_DEPRECATED = 13,
111 /* Deprecated. Use 250 instead (Any other reason) */
113 J1939_XTP_ABORT_ECTS_UNXPECTED_PGN = 14,
114 /* Unexpected ECTS PGN (PGN in ECTS is bad) */
116 J1939_XTP_ABORT_ECTS_TOO_BIG = 15,
117 /* ECTS requested packets exceeds message size */
119 J1939_XTP_ABORT_OTHER = 250,
120 /* Any other reason (if a Connection Abort reason is
121 * identified that is not listed in the table use code 250)
125 static unsigned int j1939_tp_block = 255;
126 static unsigned int j1939_tp_packet_delay;
127 static unsigned int j1939_tp_padding = 1;
130 static const char *j1939_xtp_abort_to_str(enum j1939_xtp_abort 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)";
170 static int j1939_xtp_abort_to_errno(struct j1939_priv *priv,
171 enum j1939_xtp_abort abort)
176 case J1939_XTP_NO_ABORT:
177 WARN_ON_ONCE(abort == J1939_XTP_NO_ABORT);
180 case J1939_XTP_ABORT_BUSY:
183 case J1939_XTP_ABORT_RESOURCE:
186 case J1939_XTP_ABORT_TIMEOUT:
189 case J1939_XTP_ABORT_GENERIC:
192 case J1939_XTP_ABORT_FAULT:
193 err = ENOTRECOVERABLE;
195 case J1939_XTP_ABORT_UNEXPECTED_DATA:
198 case J1939_XTP_ABORT_BAD_SEQ:
201 case J1939_XTP_ABORT_DUP_SEQ:
204 case J1939_XTP_ABORT_EDPO_UNEXPECTED:
207 case J1939_XTP_ABORT_BAD_EDPO_PGN:
210 case J1939_XTP_ABORT_EDPO_OUTOF_CTS:
213 case J1939_XTP_ABORT_BAD_EDPO_OFFSET:
216 case J1939_XTP_ABORT_OTHER_DEPRECATED:
219 case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN:
222 case J1939_XTP_ABORT_ECTS_TOO_BIG:
225 case J1939_XTP_ABORT_OTHER:
229 netdev_warn(priv->ndev, "Unknown abort code %i", abort);
236 static inline void j1939_session_list_lock(struct j1939_priv *priv)
238 spin_lock_bh(&priv->active_session_list_lock);
241 static inline void j1939_session_list_unlock(struct j1939_priv *priv)
243 spin_unlock_bh(&priv->active_session_list_lock);
246 void j1939_session_get(struct j1939_session *session)
248 kref_get(&session->kref);
251 /* session completion functions */
252 static void __j1939_session_drop(struct j1939_session *session)
254 if (!session->transmission)
257 j1939_sock_pending_del(session->sk);
258 sock_put(session->sk);
261 static void j1939_session_destroy(struct j1939_session *session)
264 j1939_sk_errqueue(session, J1939_ERRQUEUE_ABORT);
266 j1939_sk_errqueue(session, J1939_ERRQUEUE_ACK);
268 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
270 WARN_ON_ONCE(!list_empty(&session->sk_session_queue_entry));
271 WARN_ON_ONCE(!list_empty(&session->active_session_list_entry));
273 skb_queue_purge(&session->skb_queue);
274 __j1939_session_drop(session);
275 j1939_priv_put(session->priv);
279 static void __j1939_session_release(struct kref *kref)
281 struct j1939_session *session = container_of(kref, struct j1939_session,
284 j1939_session_destroy(session);
287 void j1939_session_put(struct j1939_session *session)
289 kref_put(&session->kref, __j1939_session_release);
292 static void j1939_session_txtimer_cancel(struct j1939_session *session)
294 if (hrtimer_cancel(&session->txtimer))
295 j1939_session_put(session);
298 static void j1939_session_rxtimer_cancel(struct j1939_session *session)
300 if (hrtimer_cancel(&session->rxtimer))
301 j1939_session_put(session);
304 void j1939_session_timers_cancel(struct j1939_session *session)
306 j1939_session_txtimer_cancel(session);
307 j1939_session_rxtimer_cancel(session);
310 static inline bool j1939_cb_is_broadcast(const struct j1939_sk_buff_cb *skcb)
312 return (!skcb->addr.dst_name && (skcb->addr.da == 0xff));
315 static void j1939_session_skb_drop_old(struct j1939_session *session)
317 struct sk_buff *do_skb;
318 struct j1939_sk_buff_cb *do_skcb;
319 unsigned int offset_start;
322 if (skb_queue_len(&session->skb_queue) < 2)
325 offset_start = session->pkt.tx_acked * 7;
327 spin_lock_irqsave(&session->skb_queue.lock, flags);
328 do_skb = skb_peek(&session->skb_queue);
329 do_skcb = j1939_skb_to_cb(do_skb);
331 if ((do_skcb->offset + do_skb->len) < offset_start) {
332 __skb_unlink(do_skb, &session->skb_queue);
333 /* drop ref taken in j1939_session_skb_queue() */
338 spin_unlock_irqrestore(&session->skb_queue.lock, flags);
341 void j1939_session_skb_queue(struct j1939_session *session,
344 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
345 struct j1939_priv *priv = session->priv;
347 j1939_ac_fixup(priv, skb);
349 if (j1939_address_is_unicast(skcb->addr.da) &&
350 priv->ents[skcb->addr.da].nusers)
351 skcb->flags |= J1939_ECU_LOCAL_DST;
353 skcb->flags |= J1939_ECU_LOCAL_SRC;
356 skb_queue_tail(&session->skb_queue, skb);
360 sk_buff *j1939_session_skb_get_by_offset(struct j1939_session *session,
361 unsigned int offset_start)
363 struct j1939_priv *priv = session->priv;
364 struct j1939_sk_buff_cb *do_skcb;
365 struct sk_buff *skb = NULL;
366 struct sk_buff *do_skb;
369 spin_lock_irqsave(&session->skb_queue.lock, flags);
370 skb_queue_walk(&session->skb_queue, do_skb) {
371 do_skcb = j1939_skb_to_cb(do_skb);
373 if (offset_start >= do_skcb->offset &&
374 offset_start < (do_skcb->offset + do_skb->len)) {
382 spin_unlock_irqrestore(&session->skb_queue.lock, flags);
385 netdev_dbg(priv->ndev, "%s: 0x%p: no skb found for start: %i, queue size: %i\n",
386 __func__, session, offset_start,
387 skb_queue_len(&session->skb_queue));
392 static struct sk_buff *j1939_session_skb_get(struct j1939_session *session)
394 unsigned int offset_start;
396 offset_start = session->pkt.dpo * 7;
397 return j1939_session_skb_get_by_offset(session, offset_start);
400 /* see if we are receiver
401 * returns 0 for broadcasts, although we will receive them
403 static inline int j1939_tp_im_receiver(const struct j1939_sk_buff_cb *skcb)
405 return skcb->flags & J1939_ECU_LOCAL_DST;
408 /* see if we are sender */
409 static inline int j1939_tp_im_transmitter(const struct j1939_sk_buff_cb *skcb)
411 return skcb->flags & J1939_ECU_LOCAL_SRC;
414 /* see if we are involved as either receiver or transmitter */
415 static int j1939_tp_im_involved(const struct j1939_sk_buff_cb *skcb, bool swap)
418 return j1939_tp_im_receiver(skcb);
420 return j1939_tp_im_transmitter(skcb);
423 static int j1939_tp_im_involved_anydir(struct j1939_sk_buff_cb *skcb)
425 return skcb->flags & (J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST);
428 /* extract pgn from flow-ctl message */
429 static inline pgn_t j1939_xtp_ctl_to_pgn(const u8 *dat)
433 pgn = (dat[7] << 16) | (dat[6] << 8) | (dat[5] << 0);
434 if (j1939_pgn_is_pdu1(pgn))
439 static inline unsigned int j1939_tp_ctl_to_size(const u8 *dat)
441 return (dat[2] << 8) + (dat[1] << 0);
444 static inline unsigned int j1939_etp_ctl_to_packet(const u8 *dat)
446 return (dat[4] << 16) | (dat[3] << 8) | (dat[2] << 0);
449 static inline unsigned int j1939_etp_ctl_to_size(const u8 *dat)
451 return (dat[4] << 24) | (dat[3] << 16) |
452 (dat[2] << 8) | (dat[1] << 0);
455 /* find existing session:
456 * reverse: swap cb's src & dst
457 * there is no problem with matching broadcasts, since
458 * broadcasts (no dst, no da) would never call this
459 * with reverse == true
461 static bool j1939_session_match(struct j1939_addr *se_addr,
462 struct j1939_addr *sk_addr, bool reverse)
464 if (se_addr->type != sk_addr->type)
468 if (se_addr->src_name) {
469 if (se_addr->src_name != sk_addr->dst_name)
471 } else if (se_addr->sa != sk_addr->da) {
475 if (se_addr->dst_name) {
476 if (se_addr->dst_name != sk_addr->src_name)
478 } else if (se_addr->da != sk_addr->sa) {
482 if (se_addr->src_name) {
483 if (se_addr->src_name != sk_addr->src_name)
485 } else if (se_addr->sa != sk_addr->sa) {
489 if (se_addr->dst_name) {
490 if (se_addr->dst_name != sk_addr->dst_name)
492 } else if (se_addr->da != sk_addr->da) {
501 j1939_session *j1939_session_get_by_addr_locked(struct j1939_priv *priv,
502 struct list_head *root,
503 struct j1939_addr *addr,
504 bool reverse, bool transmitter)
506 struct j1939_session *session;
508 lockdep_assert_held(&priv->active_session_list_lock);
510 list_for_each_entry(session, root, active_session_list_entry) {
511 j1939_session_get(session);
512 if (j1939_session_match(&session->skcb.addr, addr, reverse) &&
513 session->transmission == transmitter)
515 j1939_session_put(session);
522 j1939_session *j1939_session_get_simple(struct j1939_priv *priv,
525 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
526 struct j1939_session *session;
528 lockdep_assert_held(&priv->active_session_list_lock);
530 list_for_each_entry(session, &priv->active_session_list,
531 active_session_list_entry) {
532 j1939_session_get(session);
533 if (session->skcb.addr.type == J1939_SIMPLE &&
534 session->tskey == skcb->tskey && session->sk == skb->sk)
536 j1939_session_put(session);
543 j1939_session *j1939_session_get_by_addr(struct j1939_priv *priv,
544 struct j1939_addr *addr,
545 bool reverse, bool transmitter)
547 struct j1939_session *session;
549 j1939_session_list_lock(priv);
550 session = j1939_session_get_by_addr_locked(priv,
551 &priv->active_session_list,
552 addr, reverse, transmitter);
553 j1939_session_list_unlock(priv);
558 static void j1939_skbcb_swap(struct j1939_sk_buff_cb *skcb)
562 swap(skcb->addr.dst_name, skcb->addr.src_name);
563 swap(skcb->addr.da, skcb->addr.sa);
565 /* swap SRC and DST flags, leave other untouched */
566 if (skcb->flags & J1939_ECU_LOCAL_SRC)
567 tmp |= J1939_ECU_LOCAL_DST;
568 if (skcb->flags & J1939_ECU_LOCAL_DST)
569 tmp |= J1939_ECU_LOCAL_SRC;
570 skcb->flags &= ~(J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST);
575 sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv,
576 const struct j1939_sk_buff_cb *re_skcb,
581 struct j1939_sk_buff_cb *skcb;
583 skb = alloc_skb(sizeof(struct can_frame) + sizeof(struct can_skb_priv),
586 return ERR_PTR(-ENOMEM);
588 skb->dev = priv->ndev;
589 can_skb_reserve(skb);
590 can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
591 can_skb_prv(skb)->skbcnt = 0;
592 /* reserve CAN header */
593 skb_reserve(skb, offsetof(struct can_frame, data));
595 memcpy(skb->cb, re_skcb, sizeof(skb->cb));
596 skcb = j1939_skb_to_cb(skb);
598 j1939_skbcb_swap(skcb);
601 if (skcb->addr.type == J1939_ETP)
602 skcb->addr.pgn = J1939_ETP_PGN_CTL;
604 skcb->addr.pgn = J1939_TP_PGN_CTL;
606 if (skcb->addr.type == J1939_ETP)
607 skcb->addr.pgn = J1939_ETP_PGN_DAT;
609 skcb->addr.pgn = J1939_TP_PGN_DAT;
615 /* TP transmit packet functions */
616 static int j1939_tp_tx_dat(struct j1939_session *session,
617 const u8 *dat, int len)
619 struct j1939_priv *priv = session->priv;
622 skb = j1939_tp_tx_dat_new(priv, &session->skcb,
627 skb_put_data(skb, dat, len);
628 if (j1939_tp_padding && len < 8)
629 memset(skb_put(skb, 8 - len), 0xff, 8 - len);
631 return j1939_send_one(priv, skb);
634 static int j1939_xtp_do_tx_ctl(struct j1939_priv *priv,
635 const struct j1939_sk_buff_cb *re_skcb,
636 bool swap_src_dst, pgn_t pgn, const u8 *dat)
641 if (!j1939_tp_im_involved(re_skcb, swap_src_dst))
644 skb = j1939_tp_tx_dat_new(priv, re_skcb, true, swap_src_dst);
648 skdat = skb_put(skb, 8);
649 memcpy(skdat, dat, 5);
650 skdat[5] = (pgn >> 0);
651 skdat[6] = (pgn >> 8);
652 skdat[7] = (pgn >> 16);
654 return j1939_send_one(priv, skb);
657 static inline int j1939_tp_tx_ctl(struct j1939_session *session,
658 bool swap_src_dst, const u8 *dat)
660 struct j1939_priv *priv = session->priv;
662 return j1939_xtp_do_tx_ctl(priv, &session->skcb,
664 session->skcb.addr.pgn, dat);
667 static int j1939_xtp_tx_abort(struct j1939_priv *priv,
668 const struct j1939_sk_buff_cb *re_skcb,
670 enum j1939_xtp_abort err,
675 if (!j1939_tp_im_involved(re_skcb, swap_src_dst))
678 memset(dat, 0xff, sizeof(dat));
679 dat[0] = J1939_TP_CMD_ABORT;
681 return j1939_xtp_do_tx_ctl(priv, re_skcb, swap_src_dst, pgn, dat);
684 void j1939_tp_schedule_txtimer(struct j1939_session *session, int msec)
686 j1939_session_get(session);
687 hrtimer_start(&session->txtimer, ms_to_ktime(msec),
688 HRTIMER_MODE_REL_SOFT);
691 static inline void j1939_tp_set_rxtimeout(struct j1939_session *session,
694 j1939_session_rxtimer_cancel(session);
695 j1939_session_get(session);
696 hrtimer_start(&session->rxtimer, ms_to_ktime(msec),
697 HRTIMER_MODE_REL_SOFT);
700 static int j1939_session_tx_rts(struct j1939_session *session)
705 memset(dat, 0xff, sizeof(dat));
707 dat[1] = (session->total_message_size >> 0);
708 dat[2] = (session->total_message_size >> 8);
709 dat[3] = session->pkt.total;
711 if (session->skcb.addr.type == J1939_ETP) {
712 dat[0] = J1939_ETP_CMD_RTS;
713 dat[1] = (session->total_message_size >> 0);
714 dat[2] = (session->total_message_size >> 8);
715 dat[3] = (session->total_message_size >> 16);
716 dat[4] = (session->total_message_size >> 24);
717 } else if (j1939_cb_is_broadcast(&session->skcb)) {
718 dat[0] = J1939_TP_CMD_BAM;
719 /* fake cts for broadcast */
722 dat[0] = J1939_TP_CMD_RTS;
726 if (dat[0] == session->last_txcmd)
730 ret = j1939_tp_tx_ctl(session, false, dat);
734 session->last_txcmd = dat[0];
735 if (dat[0] == J1939_TP_CMD_BAM) {
736 j1939_tp_schedule_txtimer(session, 50);
737 j1939_tp_set_rxtimeout(session, 250);
739 j1939_tp_set_rxtimeout(session, 1250);
742 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
747 static int j1939_session_tx_dpo(struct j1939_session *session)
753 memset(dat, 0xff, sizeof(dat));
755 dat[0] = J1939_ETP_CMD_DPO;
756 session->pkt.dpo = session->pkt.tx_acked;
757 pkt = session->pkt.dpo;
758 dat[1] = session->pkt.last - session->pkt.tx_acked;
761 dat[4] = (pkt >> 16);
763 ret = j1939_tp_tx_ctl(session, false, dat);
767 session->last_txcmd = dat[0];
768 j1939_tp_set_rxtimeout(session, 1250);
769 session->pkt.tx = session->pkt.tx_acked;
771 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
776 static int j1939_session_tx_dat(struct j1939_session *session)
778 struct j1939_priv *priv = session->priv;
779 struct j1939_sk_buff_cb *skcb;
780 int offset, pkt_done, pkt_end;
781 unsigned int len, pdelay;
782 struct sk_buff *se_skb;
787 se_skb = j1939_session_skb_get_by_offset(session, session->pkt.tx * 7);
791 skcb = j1939_skb_to_cb(se_skb);
792 tpdat = se_skb->data;
795 if (session->skcb.addr.type != J1939_ETP &&
796 j1939_cb_is_broadcast(&session->skcb))
797 pkt_end = session->pkt.total;
799 pkt_end = session->pkt.last;
801 while (session->pkt.tx < pkt_end) {
802 dat[0] = session->pkt.tx - session->pkt.dpo + 1;
803 offset = (session->pkt.tx * 7) - skcb->offset;
804 len = se_skb->len - offset;
808 if (offset + len > se_skb->len) {
809 netdev_err_once(priv->ndev,
810 "%s: 0x%p: requested data outside of queued buffer: offset %i, len %i, pkt.tx: %i\n",
811 __func__, session, skcb->offset, se_skb->len , session->pkt.tx);
821 memcpy(&dat[1], &tpdat[offset], len);
822 ret = j1939_tp_tx_dat(session, dat, len + 1);
824 /* ENOBUS == CAN interface TX queue is full */
826 netdev_alert(priv->ndev,
827 "%s: 0x%p: queue data error: %i\n",
828 __func__, session, ret);
832 session->last_txcmd = 0xff;
835 pdelay = j1939_cb_is_broadcast(&session->skcb) ? 50 :
836 j1939_tp_packet_delay;
838 if (session->pkt.tx < session->pkt.total && pdelay) {
839 j1939_tp_schedule_txtimer(session, pdelay);
845 j1939_tp_set_rxtimeout(session, 250);
856 static int j1939_xtp_txnext_transmiter(struct j1939_session *session)
858 struct j1939_priv *priv = session->priv;
861 if (!j1939_tp_im_transmitter(&session->skcb)) {
862 netdev_alert(priv->ndev, "%s: 0x%p: called by not transmitter!\n",
867 switch (session->last_cmd) {
869 ret = j1939_session_tx_rts(session);
872 case J1939_ETP_CMD_CTS:
873 if (session->last_txcmd != J1939_ETP_CMD_DPO) {
874 ret = j1939_session_tx_dpo(session);
880 case J1939_TP_CMD_CTS:
881 case 0xff: /* did some data */
882 case J1939_ETP_CMD_DPO:
883 case J1939_TP_CMD_BAM:
884 ret = j1939_session_tx_dat(session);
888 netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n",
889 __func__, session, session->last_cmd);
895 static int j1939_session_tx_cts(struct j1939_session *session)
897 struct j1939_priv *priv = session->priv;
898 unsigned int pkt, len;
902 if (!j1939_sk_recv_match(priv, &session->skcb))
905 len = session->pkt.total - session->pkt.rx;
906 len = min3(len, session->pkt.block, j1939_tp_block ?: 255);
907 memset(dat, 0xff, sizeof(dat));
909 if (session->skcb.addr.type == J1939_ETP) {
910 pkt = session->pkt.rx + 1;
911 dat[0] = J1939_ETP_CMD_CTS;
915 dat[4] = (pkt >> 16);
917 dat[0] = J1939_TP_CMD_CTS;
919 dat[2] = session->pkt.rx + 1;
922 if (dat[0] == session->last_txcmd)
926 ret = j1939_tp_tx_ctl(session, true, dat);
931 /* only mark cts done when len is set */
932 session->last_txcmd = dat[0];
933 j1939_tp_set_rxtimeout(session, 1250);
935 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
940 static int j1939_session_tx_eoma(struct j1939_session *session)
942 struct j1939_priv *priv = session->priv;
946 if (!j1939_sk_recv_match(priv, &session->skcb))
949 memset(dat, 0xff, sizeof(dat));
951 if (session->skcb.addr.type == J1939_ETP) {
952 dat[0] = J1939_ETP_CMD_EOMA;
953 dat[1] = session->total_message_size >> 0;
954 dat[2] = session->total_message_size >> 8;
955 dat[3] = session->total_message_size >> 16;
956 dat[4] = session->total_message_size >> 24;
958 dat[0] = J1939_TP_CMD_EOMA;
959 dat[1] = session->total_message_size;
960 dat[2] = session->total_message_size >> 8;
961 dat[3] = session->pkt.total;
964 if (dat[0] == session->last_txcmd)
968 ret = j1939_tp_tx_ctl(session, true, dat);
972 session->last_txcmd = dat[0];
974 /* wait for the EOMA packet to come in */
975 j1939_tp_set_rxtimeout(session, 1250);
977 netdev_dbg(session->priv->ndev, "%p: 0x%p\n", __func__, session);
982 static int j1939_xtp_txnext_receiver(struct j1939_session *session)
984 struct j1939_priv *priv = session->priv;
987 if (!j1939_tp_im_receiver(&session->skcb)) {
988 netdev_alert(priv->ndev, "%s: 0x%p: called by not receiver!\n",
993 switch (session->last_cmd) {
994 case J1939_TP_CMD_RTS:
995 case J1939_ETP_CMD_RTS:
996 ret = j1939_session_tx_cts(session);
999 case J1939_ETP_CMD_CTS:
1000 case J1939_TP_CMD_CTS:
1001 case 0xff: /* did some data */
1002 case J1939_ETP_CMD_DPO:
1003 if ((session->skcb.addr.type == J1939_TP &&
1004 j1939_cb_is_broadcast(&session->skcb)))
1007 if (session->pkt.rx >= session->pkt.total) {
1008 ret = j1939_session_tx_eoma(session);
1009 } else if (session->pkt.rx >= session->pkt.last) {
1010 session->last_txcmd = 0;
1011 ret = j1939_session_tx_cts(session);
1015 netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n",
1016 __func__, session, session->last_cmd);
1022 static int j1939_simple_txnext(struct j1939_session *session)
1024 struct j1939_priv *priv = session->priv;
1025 struct sk_buff *se_skb = j1939_session_skb_get(session);
1026 struct sk_buff *skb;
1032 skb = skb_clone(se_skb, GFP_ATOMIC);
1038 can_skb_set_owner(skb, se_skb->sk);
1040 j1939_tp_set_rxtimeout(session, J1939_SIMPLE_ECHO_TIMEOUT_MS);
1042 ret = j1939_send_one(priv, skb);
1046 j1939_sk_errqueue(session, J1939_ERRQUEUE_SCHED);
1047 j1939_sk_queue_activate_next(session);
1053 consume_skb(se_skb);
1058 static bool j1939_session_deactivate_locked(struct j1939_session *session)
1060 bool active = false;
1062 lockdep_assert_held(&session->priv->active_session_list_lock);
1064 if (session->state >= J1939_SESSION_ACTIVE &&
1065 session->state < J1939_SESSION_ACTIVE_MAX) {
1068 list_del_init(&session->active_session_list_entry);
1069 session->state = J1939_SESSION_DONE;
1070 j1939_session_put(session);
1076 static bool j1939_session_deactivate(struct j1939_session *session)
1080 j1939_session_list_lock(session->priv);
1081 active = j1939_session_deactivate_locked(session);
1082 j1939_session_list_unlock(session->priv);
1088 j1939_session_deactivate_activate_next(struct j1939_session *session)
1090 if (j1939_session_deactivate(session))
1091 j1939_sk_queue_activate_next(session);
1094 static void __j1939_session_cancel(struct j1939_session *session,
1095 enum j1939_xtp_abort err)
1097 struct j1939_priv *priv = session->priv;
1100 lockdep_assert_held(&session->priv->active_session_list_lock);
1102 session->err = j1939_xtp_abort_to_errno(priv, err);
1103 session->state = J1939_SESSION_WAITING_ABORT;
1104 /* do not send aborts on incoming broadcasts */
1105 if (!j1939_cb_is_broadcast(&session->skcb)) {
1106 j1939_xtp_tx_abort(priv, &session->skcb,
1107 !session->transmission,
1108 err, session->skcb.addr.pgn);
1112 j1939_sk_send_loop_abort(session->sk, session->err);
1115 static void j1939_session_cancel(struct j1939_session *session,
1116 enum j1939_xtp_abort err)
1118 j1939_session_list_lock(session->priv);
1120 if (session->state >= J1939_SESSION_ACTIVE &&
1121 session->state < J1939_SESSION_WAITING_ABORT) {
1122 j1939_tp_set_rxtimeout(session, J1939_XTP_ABORT_TIMEOUT_MS);
1123 __j1939_session_cancel(session, err);
1126 j1939_session_list_unlock(session->priv);
1129 static enum hrtimer_restart j1939_tp_txtimer(struct hrtimer *hrtimer)
1131 struct j1939_session *session =
1132 container_of(hrtimer, struct j1939_session, txtimer);
1133 struct j1939_priv *priv = session->priv;
1136 if (session->skcb.addr.type == J1939_SIMPLE) {
1137 ret = j1939_simple_txnext(session);
1139 if (session->transmission)
1140 ret = j1939_xtp_txnext_transmiter(session);
1142 ret = j1939_xtp_txnext_receiver(session);
1147 /* Retry limit is currently arbitrary chosen */
1148 if (session->tx_retry < J1939_XTP_TX_RETRY_LIMIT) {
1149 session->tx_retry++;
1150 j1939_tp_schedule_txtimer(session,
1151 10 + prandom_u32_max(16));
1153 netdev_alert(priv->ndev, "%s: 0x%p: tx retry count reached\n",
1155 session->err = -ENETUNREACH;
1156 j1939_session_rxtimer_cancel(session);
1157 j1939_session_deactivate_activate_next(session);
1161 /* In this case we should get a netdev_event(), all active
1162 * sessions will be cleared by
1163 * j1939_cancel_all_active_sessions(). So handle this as an
1164 * error, but let j1939_cancel_all_active_sessions() do the
1165 * cleanup including propagation of the error to user space.
1169 j1939_session_cancel(session, J1939_XTP_ABORT_ECTS_TOO_BIG);
1172 session->tx_retry = 0;
1175 netdev_alert(priv->ndev, "%s: 0x%p: tx aborted with unknown reason: %i\n",
1176 __func__, session, ret);
1177 if (session->skcb.addr.type != J1939_SIMPLE) {
1178 j1939_session_cancel(session, J1939_XTP_ABORT_OTHER);
1181 j1939_session_rxtimer_cancel(session);
1182 j1939_session_deactivate_activate_next(session);
1186 j1939_session_put(session);
1188 return HRTIMER_NORESTART;
1191 static void j1939_session_completed(struct j1939_session *session)
1193 struct sk_buff *skb;
1195 if (!session->transmission) {
1196 skb = j1939_session_skb_get(session);
1197 /* distribute among j1939 receivers */
1198 j1939_sk_recv(session->priv, skb);
1202 j1939_session_deactivate_activate_next(session);
1205 static enum hrtimer_restart j1939_tp_rxtimer(struct hrtimer *hrtimer)
1207 struct j1939_session *session = container_of(hrtimer,
1208 struct j1939_session,
1210 struct j1939_priv *priv = session->priv;
1212 if (session->state == J1939_SESSION_WAITING_ABORT) {
1213 netdev_alert(priv->ndev, "%s: 0x%p: abort rx timeout. Force session deactivation\n",
1216 j1939_session_deactivate_activate_next(session);
1218 } else if (session->skcb.addr.type == J1939_SIMPLE) {
1219 netdev_alert(priv->ndev, "%s: 0x%p: Timeout. Failed to send simple message.\n",
1222 /* The message is probably stuck in the CAN controller and can
1223 * be send as soon as CAN bus is in working state again.
1225 session->err = -ETIME;
1226 j1939_session_deactivate(session);
1228 netdev_alert(priv->ndev, "%s: 0x%p: rx timeout, send abort\n",
1231 j1939_session_list_lock(session->priv);
1232 if (session->state >= J1939_SESSION_ACTIVE &&
1233 session->state < J1939_SESSION_ACTIVE_MAX) {
1234 j1939_session_get(session);
1235 hrtimer_start(&session->rxtimer,
1236 ms_to_ktime(J1939_XTP_ABORT_TIMEOUT_MS),
1237 HRTIMER_MODE_REL_SOFT);
1238 __j1939_session_cancel(session, J1939_XTP_ABORT_TIMEOUT);
1240 j1939_session_list_unlock(session->priv);
1243 j1939_session_put(session);
1245 return HRTIMER_NORESTART;
1248 static bool j1939_xtp_rx_cmd_bad_pgn(struct j1939_session *session,
1249 const struct sk_buff *skb)
1251 const struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1252 pgn_t pgn = j1939_xtp_ctl_to_pgn(skb->data);
1253 struct j1939_priv *priv = session->priv;
1254 enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT;
1255 u8 cmd = skb->data[0];
1257 if (session->skcb.addr.pgn == pgn)
1261 case J1939_TP_CMD_BAM:
1262 abort = J1939_XTP_NO_ABORT;
1265 case J1939_ETP_CMD_RTS:
1266 case J1939_TP_CMD_RTS: /* fall through */
1267 abort = J1939_XTP_ABORT_BUSY;
1270 case J1939_ETP_CMD_CTS:
1271 case J1939_TP_CMD_CTS: /* fall through */
1272 abort = J1939_XTP_ABORT_ECTS_UNXPECTED_PGN;
1275 case J1939_ETP_CMD_DPO:
1276 abort = J1939_XTP_ABORT_BAD_EDPO_PGN;
1279 case J1939_ETP_CMD_EOMA:
1280 case J1939_TP_CMD_EOMA: /* fall through */
1281 abort = J1939_XTP_ABORT_OTHER;
1284 case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */
1285 abort = J1939_XTP_NO_ABORT;
1293 netdev_warn(priv->ndev, "%s: 0x%p: CMD 0x%02x with PGN 0x%05x for running session with different PGN 0x%05x.\n",
1294 __func__, session, cmd, pgn, session->skcb.addr.pgn);
1295 if (abort != J1939_XTP_NO_ABORT)
1296 j1939_xtp_tx_abort(priv, skcb, true, abort, pgn);
1301 static void j1939_xtp_rx_abort_one(struct j1939_priv *priv, struct sk_buff *skb,
1302 bool reverse, bool transmitter)
1304 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1305 struct j1939_session *session;
1306 u8 abort = skb->data[1];
1308 session = j1939_session_get_by_addr(priv, &skcb->addr, reverse,
1313 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1316 netdev_info(priv->ndev, "%s: 0x%p: 0x%05x: (%u) %s\n", __func__,
1317 session, j1939_xtp_ctl_to_pgn(skb->data), abort,
1318 j1939_xtp_abort_to_str(abort));
1320 j1939_session_timers_cancel(session);
1321 session->err = j1939_xtp_abort_to_errno(priv, abort);
1323 j1939_sk_send_loop_abort(session->sk, session->err);
1324 j1939_session_deactivate_activate_next(session);
1327 j1939_session_put(session);
1330 /* abort packets may come in 2 directions */
1332 j1939_xtp_rx_abort(struct j1939_priv *priv, struct sk_buff *skb,
1335 j1939_xtp_rx_abort_one(priv, skb, false, transmitter);
1336 j1939_xtp_rx_abort_one(priv, skb, true, transmitter);
1340 j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb)
1342 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1346 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1351 if (skcb->addr.type == J1939_ETP)
1352 len = j1939_etp_ctl_to_size(dat);
1354 len = j1939_tp_ctl_to_size(dat);
1356 if (session->total_message_size != len) {
1357 netdev_warn_once(session->priv->ndev,
1358 "%s: 0x%p: Incorrect size. Expected: %i; got: %i.\n",
1359 __func__, session, session->total_message_size,
1363 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
1365 session->pkt.tx_acked = session->pkt.total;
1366 j1939_session_timers_cancel(session);
1367 /* transmitted without problems */
1368 j1939_session_completed(session);
1372 j1939_xtp_rx_eoma(struct j1939_priv *priv, struct sk_buff *skb,
1375 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1376 struct j1939_session *session;
1378 session = j1939_session_get_by_addr(priv, &skcb->addr, true,
1383 j1939_xtp_rx_eoma_one(session, skb);
1384 j1939_session_put(session);
1388 j1939_xtp_rx_cts_one(struct j1939_session *session, struct sk_buff *skb)
1390 enum j1939_xtp_abort err = J1939_XTP_ABORT_FAULT;
1396 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1399 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
1401 if (session->last_cmd == dat[0]) {
1402 err = J1939_XTP_ABORT_DUP_SEQ;
1403 goto out_session_cancel;
1406 if (session->skcb.addr.type == J1939_ETP)
1407 pkt = j1939_etp_ctl_to_packet(dat);
1412 goto out_session_cancel;
1413 else if (dat[1] > session->pkt.block /* 0xff for etp */)
1414 goto out_session_cancel;
1416 /* set packet counters only when not CTS(0) */
1417 session->pkt.tx_acked = pkt - 1;
1418 j1939_session_skb_drop_old(session);
1419 session->pkt.last = session->pkt.tx_acked + dat[1];
1420 if (session->pkt.last > session->pkt.total)
1421 /* safety measure */
1422 session->pkt.last = session->pkt.total;
1423 /* TODO: do not set tx here, do it in txtimer */
1424 session->pkt.tx = session->pkt.tx_acked;
1426 session->last_cmd = dat[0];
1428 j1939_tp_set_rxtimeout(session, 1250);
1429 if (session->transmission) {
1430 if (session->pkt.tx_acked)
1431 j1939_sk_errqueue(session,
1432 J1939_ERRQUEUE_SCHED);
1433 j1939_session_txtimer_cancel(session);
1434 j1939_tp_schedule_txtimer(session, 0);
1438 j1939_tp_set_rxtimeout(session, 550);
1443 j1939_session_timers_cancel(session);
1444 j1939_session_cancel(session, err);
1448 j1939_xtp_rx_cts(struct j1939_priv *priv, struct sk_buff *skb, bool transmitter)
1450 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1451 struct j1939_session *session;
1453 session = j1939_session_get_by_addr(priv, &skcb->addr, true,
1457 j1939_xtp_rx_cts_one(session, skb);
1458 j1939_session_put(session);
1461 static struct j1939_session *j1939_session_new(struct j1939_priv *priv,
1462 struct sk_buff *skb, size_t size)
1464 struct j1939_session *session;
1465 struct j1939_sk_buff_cb *skcb;
1467 session = kzalloc(sizeof(*session), gfp_any());
1471 INIT_LIST_HEAD(&session->active_session_list_entry);
1472 INIT_LIST_HEAD(&session->sk_session_queue_entry);
1473 kref_init(&session->kref);
1475 j1939_priv_get(priv);
1476 session->priv = priv;
1477 session->total_message_size = size;
1478 session->state = J1939_SESSION_NEW;
1480 skb_queue_head_init(&session->skb_queue);
1481 skb_queue_tail(&session->skb_queue, skb);
1483 skcb = j1939_skb_to_cb(skb);
1484 memcpy(&session->skcb, skcb, sizeof(session->skcb));
1486 hrtimer_init(&session->txtimer, CLOCK_MONOTONIC,
1487 HRTIMER_MODE_REL_SOFT);
1488 session->txtimer.function = j1939_tp_txtimer;
1489 hrtimer_init(&session->rxtimer, CLOCK_MONOTONIC,
1490 HRTIMER_MODE_REL_SOFT);
1491 session->rxtimer.function = j1939_tp_rxtimer;
1493 netdev_dbg(priv->ndev, "%s: 0x%p: sa: %02x, da: %02x\n",
1494 __func__, session, skcb->addr.sa, skcb->addr.da);
1500 j1939_session *j1939_session_fresh_new(struct j1939_priv *priv,
1502 const struct j1939_sk_buff_cb *rel_skcb)
1504 struct sk_buff *skb;
1505 struct j1939_sk_buff_cb *skcb;
1506 struct j1939_session *session;
1508 skb = alloc_skb(size + sizeof(struct can_skb_priv), GFP_ATOMIC);
1512 skb->dev = priv->ndev;
1513 can_skb_reserve(skb);
1514 can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
1515 can_skb_prv(skb)->skbcnt = 0;
1516 skcb = j1939_skb_to_cb(skb);
1517 memcpy(skcb, rel_skcb, sizeof(*skcb));
1519 session = j1939_session_new(priv, skb, size);
1525 /* alloc data area */
1527 /* skb is recounted in j1939_session_new() */
1531 int j1939_session_activate(struct j1939_session *session)
1533 struct j1939_priv *priv = session->priv;
1534 struct j1939_session *active = NULL;
1537 j1939_session_list_lock(priv);
1538 if (session->skcb.addr.type != J1939_SIMPLE)
1539 active = j1939_session_get_by_addr_locked(priv,
1540 &priv->active_session_list,
1541 &session->skcb.addr, false,
1542 session->transmission);
1544 j1939_session_put(active);
1547 WARN_ON_ONCE(session->state != J1939_SESSION_NEW);
1548 list_add_tail(&session->active_session_list_entry,
1549 &priv->active_session_list);
1550 j1939_session_get(session);
1551 session->state = J1939_SESSION_ACTIVE;
1553 netdev_dbg(session->priv->ndev, "%s: 0x%p\n",
1556 j1939_session_list_unlock(priv);
1562 j1939_session *j1939_xtp_rx_rts_session_new(struct j1939_priv *priv,
1563 struct sk_buff *skb)
1565 enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT;
1566 struct j1939_sk_buff_cb skcb = *j1939_skb_to_cb(skb);
1567 struct j1939_session *session;
1572 netdev_dbg(priv->ndev, "%s\n", __func__);
1575 pgn = j1939_xtp_ctl_to_pgn(dat);
1576 skcb.addr.pgn = pgn;
1578 if (!j1939_sk_recv_match(priv, &skcb))
1581 if (skcb.addr.type == J1939_ETP) {
1582 len = j1939_etp_ctl_to_size(dat);
1583 if (len > J1939_MAX_ETP_PACKET_SIZE)
1584 abort = J1939_XTP_ABORT_FAULT;
1585 else if (len > priv->tp_max_packet_size)
1586 abort = J1939_XTP_ABORT_RESOURCE;
1587 else if (len <= J1939_MAX_TP_PACKET_SIZE)
1588 abort = J1939_XTP_ABORT_FAULT;
1590 len = j1939_tp_ctl_to_size(dat);
1591 if (len > J1939_MAX_TP_PACKET_SIZE)
1592 abort = J1939_XTP_ABORT_FAULT;
1593 else if (len > priv->tp_max_packet_size)
1594 abort = J1939_XTP_ABORT_RESOURCE;
1597 if (abort != J1939_XTP_NO_ABORT) {
1598 j1939_xtp_tx_abort(priv, &skcb, true, abort, pgn);
1602 session = j1939_session_fresh_new(priv, len, &skcb);
1604 j1939_xtp_tx_abort(priv, &skcb, true,
1605 J1939_XTP_ABORT_RESOURCE, pgn);
1609 /* initialize the control buffer: plain copy */
1610 session->pkt.total = (len + 6) / 7;
1611 session->pkt.block = 0xff;
1612 if (skcb.addr.type != J1939_ETP) {
1613 if (dat[3] != session->pkt.total)
1614 netdev_alert(priv->ndev, "%s: 0x%p: strange total, %u != %u\n",
1615 __func__, session, session->pkt.total,
1617 session->pkt.total = dat[3];
1618 session->pkt.block = min(dat[3], dat[4]);
1621 session->pkt.rx = 0;
1622 session->pkt.tx = 0;
1624 WARN_ON_ONCE(j1939_session_activate(session));
1629 static int j1939_xtp_rx_rts_session_active(struct j1939_session *session,
1630 struct sk_buff *skb)
1632 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1633 struct j1939_priv *priv = session->priv;
1635 if (!session->transmission) {
1636 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1639 /* RTS on active session */
1640 j1939_session_timers_cancel(session);
1641 j1939_session_cancel(session, J1939_XTP_ABORT_BUSY);
1644 if (session->last_cmd != 0) {
1645 /* we received a second rts on the same connection */
1646 netdev_alert(priv->ndev, "%s: 0x%p: connection exists (%02x %02x). last cmd: %x\n",
1647 __func__, session, skcb->addr.sa, skcb->addr.da,
1650 j1939_session_timers_cancel(session);
1651 j1939_session_cancel(session, J1939_XTP_ABORT_BUSY);
1656 if (session->skcb.addr.sa != skcb->addr.sa ||
1657 session->skcb.addr.da != skcb->addr.da)
1658 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",
1660 session->skcb.addr.sa, skcb->addr.sa,
1661 session->skcb.addr.da, skcb->addr.da);
1662 /* make sure 'sa' & 'da' are correct !
1663 * They may be 'not filled in yet' for sending
1664 * skb's, since they did not pass the Address Claim ever.
1666 session->skcb.addr.sa = skcb->addr.sa;
1667 session->skcb.addr.da = skcb->addr.da;
1669 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
1674 static void j1939_xtp_rx_rts(struct j1939_priv *priv, struct sk_buff *skb,
1677 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1678 struct j1939_session *session;
1679 u8 cmd = skb->data[0];
1681 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1686 /* If we're the transmitter and this function is called,
1687 * we received our own RTS. A session has already been
1690 * For some reasons however it might have been destroyed
1691 * already. So don't create a new one here (using
1692 * "j1939_xtp_rx_rts_session_new()") as this will be a
1695 * The reasons the session is already destroyed might
1697 * - user space closed socket was and the session was
1699 * - session was aborted due to external abort message
1703 session = j1939_xtp_rx_rts_session_new(priv, skb);
1705 if (cmd == J1939_TP_CMD_BAM && j1939_sk_recv_match(priv, skcb))
1706 netdev_info(priv->ndev, "%s: failed to create TP BAM session\n",
1711 if (j1939_xtp_rx_rts_session_active(session, skb)) {
1712 j1939_session_put(session);
1716 session->last_cmd = cmd;
1718 if (cmd == J1939_TP_CMD_BAM) {
1719 if (!session->transmission)
1720 j1939_tp_set_rxtimeout(session, 750);
1722 if (!session->transmission) {
1723 j1939_session_txtimer_cancel(session);
1724 j1939_tp_schedule_txtimer(session, 0);
1726 j1939_tp_set_rxtimeout(session, 1250);
1729 j1939_session_put(session);
1732 static void j1939_xtp_rx_dpo_one(struct j1939_session *session,
1733 struct sk_buff *skb)
1735 const u8 *dat = skb->data;
1737 if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
1740 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
1742 /* transmitted without problems */
1743 session->pkt.dpo = j1939_etp_ctl_to_packet(skb->data);
1744 session->last_cmd = dat[0];
1745 j1939_tp_set_rxtimeout(session, 750);
1748 static void j1939_xtp_rx_dpo(struct j1939_priv *priv, struct sk_buff *skb,
1751 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1752 struct j1939_session *session;
1754 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1757 netdev_info(priv->ndev,
1758 "%s: no connection found\n", __func__);
1762 j1939_xtp_rx_dpo_one(session, skb);
1763 j1939_session_put(session);
1766 static void j1939_xtp_rx_dat_one(struct j1939_session *session,
1767 struct sk_buff *skb)
1769 struct j1939_priv *priv = session->priv;
1770 struct j1939_sk_buff_cb *skcb;
1771 struct sk_buff *se_skb = NULL;
1777 bool remain = false;
1778 bool do_cts_eoma = false;
1781 skcb = j1939_skb_to_cb(skb);
1784 /* makes no sense */
1785 goto out_session_cancel;
1787 switch (session->last_cmd) {
1790 case J1939_ETP_CMD_DPO:
1791 if (skcb->addr.type == J1939_ETP)
1794 case J1939_TP_CMD_BAM:
1795 case J1939_TP_CMD_CTS: /* fall through */
1796 if (skcb->addr.type != J1939_ETP)
1800 netdev_info(priv->ndev, "%s: 0x%p: last %02x\n", __func__,
1801 session, session->last_cmd);
1802 goto out_session_cancel;
1805 packet = (dat[0] - 1 + session->pkt.dpo);
1806 if (packet > session->pkt.total ||
1807 (session->pkt.rx + 1) > session->pkt.total) {
1808 netdev_info(priv->ndev, "%s: 0x%p: should have been completed\n",
1810 goto out_session_cancel;
1813 se_skb = j1939_session_skb_get_by_offset(session, packet * 7);
1815 netdev_warn(priv->ndev, "%s: 0x%p: no skb found\n", __func__,
1817 goto out_session_cancel;
1820 skcb = j1939_skb_to_cb(se_skb);
1821 offset = packet * 7 - skcb->offset;
1822 nbytes = se_skb->len - offset;
1825 if (nbytes <= 0 || (nbytes + 1) > skb->len) {
1826 netdev_info(priv->ndev, "%s: 0x%p: nbytes %i, len %i\n",
1827 __func__, session, nbytes, skb->len);
1828 goto out_session_cancel;
1831 tpdat = se_skb->data;
1832 if (!session->transmission) {
1833 memcpy(&tpdat[offset], &dat[1], nbytes);
1837 err = memcmp(&tpdat[offset], &dat[1], nbytes);
1839 netdev_err_once(priv->ndev,
1840 "%s: 0x%p: Data of RX-looped back packet (%*ph) doesn't match TX data (%*ph)!\n",
1843 nbytes, &tpdat[offset]);
1846 if (packet == session->pkt.rx)
1849 if (skcb->addr.type != J1939_ETP &&
1850 j1939_cb_is_broadcast(&session->skcb)) {
1851 if (session->pkt.rx >= session->pkt.total)
1856 /* never final, an EOMA must follow */
1857 if (session->pkt.rx >= session->pkt.last)
1862 j1939_session_timers_cancel(session);
1863 j1939_session_completed(session);
1864 } else if (remain) {
1865 if (!session->transmission)
1866 j1939_tp_set_rxtimeout(session, 750);
1867 } else if (do_cts_eoma) {
1868 j1939_tp_set_rxtimeout(session, 1250);
1869 if (!session->transmission)
1870 j1939_tp_schedule_txtimer(session, 0);
1872 j1939_tp_set_rxtimeout(session, 250);
1874 session->last_cmd = 0xff;
1875 consume_skb(se_skb);
1876 j1939_session_put(session);
1882 j1939_session_timers_cancel(session);
1883 j1939_session_cancel(session, J1939_XTP_ABORT_FAULT);
1884 j1939_session_put(session);
1887 static void j1939_xtp_rx_dat(struct j1939_priv *priv, struct sk_buff *skb)
1889 struct j1939_sk_buff_cb *skcb;
1890 struct j1939_session *session;
1892 skcb = j1939_skb_to_cb(skb);
1894 if (j1939_tp_im_transmitter(skcb)) {
1895 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1898 netdev_info(priv->ndev, "%s: no tx connection found\n",
1901 j1939_xtp_rx_dat_one(session, skb);
1904 if (j1939_tp_im_receiver(skcb)) {
1905 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1908 netdev_info(priv->ndev, "%s: no rx connection found\n",
1911 j1939_xtp_rx_dat_one(session, skb);
1914 if (j1939_cb_is_broadcast(skcb)) {
1915 session = j1939_session_get_by_addr(priv, &skcb->addr, false,
1918 j1939_xtp_rx_dat_one(session, skb);
1922 /* j1939 main intf */
1923 struct j1939_session *j1939_tp_send(struct j1939_priv *priv,
1924 struct sk_buff *skb, size_t size)
1926 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1927 struct j1939_session *session;
1930 if (skcb->addr.pgn == J1939_TP_PGN_DAT ||
1931 skcb->addr.pgn == J1939_TP_PGN_CTL ||
1932 skcb->addr.pgn == J1939_ETP_PGN_DAT ||
1933 skcb->addr.pgn == J1939_ETP_PGN_CTL)
1934 /* avoid conflict */
1935 return ERR_PTR(-EDOM);
1937 if (size > priv->tp_max_packet_size)
1938 return ERR_PTR(-EMSGSIZE);
1941 skcb->addr.type = J1939_SIMPLE;
1942 else if (size > J1939_MAX_TP_PACKET_SIZE)
1943 skcb->addr.type = J1939_ETP;
1945 skcb->addr.type = J1939_TP;
1947 if (skcb->addr.type == J1939_ETP &&
1948 j1939_cb_is_broadcast(skcb))
1949 return ERR_PTR(-EDESTADDRREQ);
1951 /* fill in addresses from names */
1952 ret = j1939_ac_fixup(priv, skb);
1954 return ERR_PTR(ret);
1956 /* fix DST flags, it may be used there soon */
1957 if (j1939_address_is_unicast(skcb->addr.da) &&
1958 priv->ents[skcb->addr.da].nusers)
1959 skcb->flags |= J1939_ECU_LOCAL_DST;
1961 /* src is always local, I'm sending ... */
1962 skcb->flags |= J1939_ECU_LOCAL_SRC;
1964 /* prepare new session */
1965 session = j1939_session_new(priv, skb, size);
1967 return ERR_PTR(-ENOMEM);
1969 /* skb is recounted in j1939_session_new() */
1971 session->sk = skb->sk;
1972 session->transmission = true;
1973 session->pkt.total = (size + 6) / 7;
1974 session->pkt.block = skcb->addr.type == J1939_ETP ? 255 :
1975 min(j1939_tp_block ?: 255, session->pkt.total);
1977 if (j1939_cb_is_broadcast(&session->skcb))
1978 /* set the end-packet for broadcast */
1979 session->pkt.last = session->pkt.total;
1981 skcb->tskey = session->sk->sk_tskey++;
1982 session->tskey = skcb->tskey;
1987 static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb)
1989 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
1990 int extd = J1939_TP;
1991 u8 cmd = skb->data[0];
1994 case J1939_ETP_CMD_RTS:
1997 case J1939_TP_CMD_BAM:
1998 case J1939_TP_CMD_RTS: /* fall through */
1999 if (skcb->addr.type != extd)
2002 if (cmd == J1939_TP_CMD_RTS && j1939_cb_is_broadcast(skcb)) {
2003 netdev_alert(priv->ndev, "%s: rts without destination (%02x)\n",
2004 __func__, skcb->addr.sa);
2008 if (j1939_tp_im_transmitter(skcb))
2009 j1939_xtp_rx_rts(priv, skb, true);
2011 if (j1939_tp_im_receiver(skcb) || j1939_cb_is_broadcast(skcb))
2012 j1939_xtp_rx_rts(priv, skb, false);
2016 case J1939_ETP_CMD_CTS:
2019 case J1939_TP_CMD_CTS:
2020 if (skcb->addr.type != extd)
2023 if (j1939_tp_im_transmitter(skcb))
2024 j1939_xtp_rx_cts(priv, skb, false);
2026 if (j1939_tp_im_receiver(skcb))
2027 j1939_xtp_rx_cts(priv, skb, true);
2031 case J1939_ETP_CMD_DPO:
2032 if (skcb->addr.type != J1939_ETP)
2035 if (j1939_tp_im_transmitter(skcb))
2036 j1939_xtp_rx_dpo(priv, skb, true);
2038 if (j1939_tp_im_receiver(skcb))
2039 j1939_xtp_rx_dpo(priv, skb, false);
2043 case J1939_ETP_CMD_EOMA:
2046 case J1939_TP_CMD_EOMA:
2047 if (skcb->addr.type != extd)
2050 if (j1939_tp_im_transmitter(skcb))
2051 j1939_xtp_rx_eoma(priv, skb, false);
2053 if (j1939_tp_im_receiver(skcb))
2054 j1939_xtp_rx_eoma(priv, skb, true);
2058 case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */
2059 if (j1939_tp_im_transmitter(skcb))
2060 j1939_xtp_rx_abort(priv, skb, true);
2062 if (j1939_tp_im_receiver(skcb))
2063 j1939_xtp_rx_abort(priv, skb, false);
2071 int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb)
2073 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
2075 if (!j1939_tp_im_involved_anydir(skcb) && !j1939_cb_is_broadcast(skcb))
2078 switch (skcb->addr.pgn) {
2079 case J1939_ETP_PGN_DAT:
2080 skcb->addr.type = J1939_ETP;
2082 case J1939_TP_PGN_DAT:
2083 j1939_xtp_rx_dat(priv, skb);
2086 case J1939_ETP_PGN_CTL:
2087 skcb->addr.type = J1939_ETP;
2089 case J1939_TP_PGN_CTL:
2091 return 0; /* Don't care. Nothing to extract here */
2093 j1939_tp_cmd_recv(priv, skb);
2096 return 0; /* no problem */
2098 return 1; /* "I processed the message" */
2101 void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb)
2103 struct j1939_session *session;
2108 if (skb->sk->sk_family != AF_CAN ||
2109 skb->sk->sk_protocol != CAN_J1939)
2112 j1939_session_list_lock(priv);
2113 session = j1939_session_get_simple(priv, skb);
2114 j1939_session_list_unlock(priv);
2116 netdev_warn(priv->ndev,
2117 "%s: Received already invalidated message\n",
2122 j1939_session_timers_cancel(session);
2123 j1939_session_deactivate(session);
2124 j1939_session_put(session);
2127 int j1939_cancel_active_session(struct j1939_priv *priv, struct sock *sk)
2129 struct j1939_session *session, *saved;
2131 netdev_dbg(priv->ndev, "%s, sk: %p\n", __func__, sk);
2132 j1939_session_list_lock(priv);
2133 list_for_each_entry_safe(session, saved,
2134 &priv->active_session_list,
2135 active_session_list_entry) {
2136 if (!sk || sk == session->sk) {
2137 if (hrtimer_try_to_cancel(&session->txtimer) == 1)
2138 j1939_session_put(session);
2139 if (hrtimer_try_to_cancel(&session->rxtimer) == 1)
2140 j1939_session_put(session);
2142 session->err = ESHUTDOWN;
2143 j1939_session_deactivate_locked(session);
2146 j1939_session_list_unlock(priv);
2150 void j1939_tp_init(struct j1939_priv *priv)
2152 spin_lock_init(&priv->active_session_list_lock);
2153 INIT_LIST_HEAD(&priv->active_session_list);
2154 priv->tp_max_packet_size = J1939_MAX_ETP_PACKET_SIZE;