1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2010-2011 EIA Electronics,
3 // Pieter Beyens <pieter.beyens@eia.be>
4 // Copyright (c) 2010-2011 EIA Electronics,
5 // Kurt Van Dijck <kurt.van.dijck@eia.be>
6 // Copyright (c) 2018 Protonic,
7 // Robin van der Gracht <robin@protonic.nl>
8 // Copyright (c) 2017-2019 Pengutronix,
9 // Marc Kleine-Budde <kernel@pengutronix.de>
10 // Copyright (c) 2017-2019 Pengutronix,
11 // Oleksij Rempel <kernel@pengutronix.de>
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/can/can-ml.h>
16 #include <linux/can/core.h>
17 #include <linux/can/skb.h>
18 #include <linux/errqueue.h>
19 #include <linux/if_arp.h>
20
21 #include "j1939-priv.h"
22
23 #define J1939_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.j1939)
24
25 /* conversion function between struct sock::sk_priority from linux and
26 * j1939 priority field
27 */
j1939_prio(u32 sk_priority)28 static inline priority_t j1939_prio(u32 sk_priority)
29 {
30 sk_priority = min(sk_priority, 7U);
31
32 return 7 - sk_priority;
33 }
34
j1939_to_sk_priority(priority_t prio)35 static inline u32 j1939_to_sk_priority(priority_t prio)
36 {
37 return 7 - prio;
38 }
39
40 /* function to see if pgn is to be evaluated */
j1939_pgn_is_valid(pgn_t pgn)41 static inline bool j1939_pgn_is_valid(pgn_t pgn)
42 {
43 return pgn <= J1939_PGN_MAX;
44 }
45
46 /* test function to avoid non-zero DA placeholder for pdu1 pgn's */
j1939_pgn_is_clean_pdu(pgn_t pgn)47 static inline bool j1939_pgn_is_clean_pdu(pgn_t pgn)
48 {
49 if (j1939_pgn_is_pdu1(pgn))
50 return !(pgn & 0xff);
51 else
52 return true;
53 }
54
j1939_sock_pending_add(struct sock * sk)55 static inline void j1939_sock_pending_add(struct sock *sk)
56 {
57 struct j1939_sock *jsk = j1939_sk(sk);
58
59 atomic_inc(&jsk->skb_pending);
60 }
61
j1939_sock_pending_get(struct sock * sk)62 static int j1939_sock_pending_get(struct sock *sk)
63 {
64 struct j1939_sock *jsk = j1939_sk(sk);
65
66 return atomic_read(&jsk->skb_pending);
67 }
68
j1939_sock_pending_del(struct sock * sk)69 void j1939_sock_pending_del(struct sock *sk)
70 {
71 struct j1939_sock *jsk = j1939_sk(sk);
72
73 /* atomic_dec_return returns the new value */
74 if (!atomic_dec_return(&jsk->skb_pending))
75 wake_up(&jsk->waitq); /* no pending SKB's */
76 }
77
j1939_jsk_add(struct j1939_priv * priv,struct j1939_sock * jsk)78 static void j1939_jsk_add(struct j1939_priv *priv, struct j1939_sock *jsk)
79 {
80 jsk->state |= J1939_SOCK_BOUND;
81 j1939_priv_get(priv);
82
83 write_lock_bh(&priv->j1939_socks_lock);
84 list_add_tail(&jsk->list, &priv->j1939_socks);
85 write_unlock_bh(&priv->j1939_socks_lock);
86 }
87
j1939_jsk_del(struct j1939_priv * priv,struct j1939_sock * jsk)88 static void j1939_jsk_del(struct j1939_priv *priv, struct j1939_sock *jsk)
89 {
90 write_lock_bh(&priv->j1939_socks_lock);
91 list_del_init(&jsk->list);
92 write_unlock_bh(&priv->j1939_socks_lock);
93
94 j1939_priv_put(priv);
95 jsk->state &= ~J1939_SOCK_BOUND;
96 }
97
j1939_sk_queue_session(struct j1939_session * session)98 static bool j1939_sk_queue_session(struct j1939_session *session)
99 {
100 struct j1939_sock *jsk = j1939_sk(session->sk);
101 bool empty;
102
103 spin_lock_bh(&jsk->sk_session_queue_lock);
104 empty = list_empty(&jsk->sk_session_queue);
105 j1939_session_get(session);
106 list_add_tail(&session->sk_session_queue_entry, &jsk->sk_session_queue);
107 spin_unlock_bh(&jsk->sk_session_queue_lock);
108 j1939_sock_pending_add(&jsk->sk);
109
110 return empty;
111 }
112
113 static struct
j1939_sk_get_incomplete_session(struct j1939_sock * jsk)114 j1939_session *j1939_sk_get_incomplete_session(struct j1939_sock *jsk)
115 {
116 struct j1939_session *session = NULL;
117
118 spin_lock_bh(&jsk->sk_session_queue_lock);
119 if (!list_empty(&jsk->sk_session_queue)) {
120 session = list_last_entry(&jsk->sk_session_queue,
121 struct j1939_session,
122 sk_session_queue_entry);
123 if (session->total_queued_size == session->total_message_size)
124 session = NULL;
125 else
126 j1939_session_get(session);
127 }
128 spin_unlock_bh(&jsk->sk_session_queue_lock);
129
130 return session;
131 }
132
j1939_sk_queue_drop_all(struct j1939_priv * priv,struct j1939_sock * jsk,int err)133 static void j1939_sk_queue_drop_all(struct j1939_priv *priv,
134 struct j1939_sock *jsk, int err)
135 {
136 struct j1939_session *session, *tmp;
137
138 netdev_dbg(priv->ndev, "%s: err: %i\n", __func__, err);
139 spin_lock_bh(&jsk->sk_session_queue_lock);
140 list_for_each_entry_safe(session, tmp, &jsk->sk_session_queue,
141 sk_session_queue_entry) {
142 list_del_init(&session->sk_session_queue_entry);
143 session->err = err;
144 j1939_session_put(session);
145 }
146 spin_unlock_bh(&jsk->sk_session_queue_lock);
147 }
148
j1939_sk_queue_activate_next_locked(struct j1939_session * session)149 static void j1939_sk_queue_activate_next_locked(struct j1939_session *session)
150 {
151 struct j1939_sock *jsk;
152 struct j1939_session *first;
153 int err;
154
155 /* RX-Session don't have a socket (yet) */
156 if (!session->sk)
157 return;
158
159 jsk = j1939_sk(session->sk);
160 lockdep_assert_held(&jsk->sk_session_queue_lock);
161
162 err = session->err;
163
164 first = list_first_entry_or_null(&jsk->sk_session_queue,
165 struct j1939_session,
166 sk_session_queue_entry);
167
168 /* Some else has already activated the next session */
169 if (first != session)
170 return;
171
172 activate_next:
173 list_del_init(&first->sk_session_queue_entry);
174 j1939_session_put(first);
175 first = list_first_entry_or_null(&jsk->sk_session_queue,
176 struct j1939_session,
177 sk_session_queue_entry);
178 if (!first)
179 return;
180
181 if (j1939_session_activate(first)) {
182 netdev_warn_once(first->priv->ndev,
183 "%s: 0x%p: Identical session is already activated.\n",
184 __func__, first);
185 first->err = -EBUSY;
186 goto activate_next;
187 } else {
188 /* Give receiver some time (arbitrary chosen) to recover */
189 int time_ms = 0;
190
191 if (err)
192 time_ms = 10 + get_random_u32_below(16);
193
194 j1939_tp_schedule_txtimer(first, time_ms);
195 }
196 }
197
j1939_sk_queue_activate_next(struct j1939_session * session)198 void j1939_sk_queue_activate_next(struct j1939_session *session)
199 {
200 struct j1939_sock *jsk;
201
202 if (!session->sk)
203 return;
204
205 jsk = j1939_sk(session->sk);
206
207 spin_lock_bh(&jsk->sk_session_queue_lock);
208 j1939_sk_queue_activate_next_locked(session);
209 spin_unlock_bh(&jsk->sk_session_queue_lock);
210 }
211
j1939_sk_match_dst(struct j1939_sock * jsk,const struct j1939_sk_buff_cb * skcb)212 static bool j1939_sk_match_dst(struct j1939_sock *jsk,
213 const struct j1939_sk_buff_cb *skcb)
214 {
215 if ((jsk->state & J1939_SOCK_PROMISC))
216 return true;
217
218 /* Destination address filter */
219 if (jsk->addr.src_name && skcb->addr.dst_name) {
220 if (jsk->addr.src_name != skcb->addr.dst_name)
221 return false;
222 } else {
223 /* receive (all sockets) if
224 * - all packages that match our bind() address
225 * - all broadcast on a socket if SO_BROADCAST
226 * is set
227 */
228 if (j1939_address_is_unicast(skcb->addr.da)) {
229 if (jsk->addr.sa != skcb->addr.da)
230 return false;
231 } else if (!sock_flag(&jsk->sk, SOCK_BROADCAST)) {
232 /* receiving broadcast without SO_BROADCAST
233 * flag is not allowed
234 */
235 return false;
236 }
237 }
238
239 /* Source address filter */
240 if (jsk->state & J1939_SOCK_CONNECTED) {
241 /* receive (all sockets) if
242 * - all packages that match our connect() name or address
243 */
244 if (jsk->addr.dst_name && skcb->addr.src_name) {
245 if (jsk->addr.dst_name != skcb->addr.src_name)
246 return false;
247 } else {
248 if (jsk->addr.da != skcb->addr.sa)
249 return false;
250 }
251 }
252
253 /* PGN filter */
254 if (j1939_pgn_is_valid(jsk->pgn_rx_filter) &&
255 jsk->pgn_rx_filter != skcb->addr.pgn)
256 return false;
257
258 return true;
259 }
260
261 /* matches skb control buffer (addr) with a j1939 filter */
j1939_sk_match_filter(struct j1939_sock * jsk,const struct j1939_sk_buff_cb * skcb)262 static bool j1939_sk_match_filter(struct j1939_sock *jsk,
263 const struct j1939_sk_buff_cb *skcb)
264 {
265 const struct j1939_filter *f;
266 int nfilter;
267
268 spin_lock_bh(&jsk->filters_lock);
269
270 f = jsk->filters;
271 nfilter = jsk->nfilters;
272
273 if (!nfilter)
274 /* receive all when no filters are assigned */
275 goto filter_match_found;
276
277 for (; nfilter; ++f, --nfilter) {
278 if ((skcb->addr.pgn & f->pgn_mask) != f->pgn)
279 continue;
280 if ((skcb->addr.sa & f->addr_mask) != f->addr)
281 continue;
282 if ((skcb->addr.src_name & f->name_mask) != f->name)
283 continue;
284 goto filter_match_found;
285 }
286
287 spin_unlock_bh(&jsk->filters_lock);
288 return false;
289
290 filter_match_found:
291 spin_unlock_bh(&jsk->filters_lock);
292 return true;
293 }
294
j1939_sk_recv_match_one(struct j1939_sock * jsk,const struct j1939_sk_buff_cb * skcb)295 static bool j1939_sk_recv_match_one(struct j1939_sock *jsk,
296 const struct j1939_sk_buff_cb *skcb)
297 {
298 if (!(jsk->state & J1939_SOCK_BOUND))
299 return false;
300
301 if (!j1939_sk_match_dst(jsk, skcb))
302 return false;
303
304 if (!j1939_sk_match_filter(jsk, skcb))
305 return false;
306
307 return true;
308 }
309
j1939_sk_recv_one(struct j1939_sock * jsk,struct sk_buff * oskb)310 static void j1939_sk_recv_one(struct j1939_sock *jsk, struct sk_buff *oskb)
311 {
312 const struct j1939_sk_buff_cb *oskcb = j1939_skb_to_cb(oskb);
313 struct j1939_sk_buff_cb *skcb;
314 struct sk_buff *skb;
315
316 if (oskb->sk == &jsk->sk)
317 return;
318
319 if (!j1939_sk_recv_match_one(jsk, oskcb))
320 return;
321
322 skb = skb_clone(oskb, GFP_ATOMIC);
323 if (!skb) {
324 pr_warn("skb clone failed\n");
325 return;
326 }
327 can_skb_set_owner(skb, oskb->sk);
328
329 skcb = j1939_skb_to_cb(skb);
330 skcb->msg_flags &= ~(MSG_DONTROUTE);
331 if (skb->sk)
332 skcb->msg_flags |= MSG_DONTROUTE;
333
334 if (sock_queue_rcv_skb(&jsk->sk, skb) < 0)
335 kfree_skb(skb);
336 }
337
j1939_sk_recv_match(struct j1939_priv * priv,struct j1939_sk_buff_cb * skcb)338 bool j1939_sk_recv_match(struct j1939_priv *priv, struct j1939_sk_buff_cb *skcb)
339 {
340 struct j1939_sock *jsk;
341 bool match = false;
342
343 read_lock_bh(&priv->j1939_socks_lock);
344 list_for_each_entry(jsk, &priv->j1939_socks, list) {
345 match = j1939_sk_recv_match_one(jsk, skcb);
346 if (match)
347 break;
348 }
349 read_unlock_bh(&priv->j1939_socks_lock);
350
351 return match;
352 }
353
j1939_sk_recv(struct j1939_priv * priv,struct sk_buff * skb)354 void j1939_sk_recv(struct j1939_priv *priv, struct sk_buff *skb)
355 {
356 struct j1939_sock *jsk;
357
358 read_lock_bh(&priv->j1939_socks_lock);
359 list_for_each_entry(jsk, &priv->j1939_socks, list) {
360 j1939_sk_recv_one(jsk, skb);
361 }
362 read_unlock_bh(&priv->j1939_socks_lock);
363 }
364
j1939_sk_sock_destruct(struct sock * sk)365 static void j1939_sk_sock_destruct(struct sock *sk)
366 {
367 struct j1939_sock *jsk = j1939_sk(sk);
368
369 /* This function will be called by the generic networking code, when
370 * the socket is ultimately closed (sk->sk_destruct).
371 *
372 * The race between
373 * - processing a received CAN frame
374 * (can_receive -> j1939_can_recv)
375 * and accessing j1939_priv
376 * ... and ...
377 * - closing a socket
378 * (j1939_can_rx_unregister -> can_rx_unregister)
379 * and calling the final j1939_priv_put()
380 *
381 * is avoided by calling the final j1939_priv_put() from this
382 * RCU deferred cleanup call.
383 */
384 if (jsk->priv) {
385 j1939_priv_put(jsk->priv);
386 jsk->priv = NULL;
387 }
388
389 /* call generic CAN sock destruct */
390 can_sock_destruct(sk);
391 }
392
j1939_sk_init(struct sock * sk)393 static int j1939_sk_init(struct sock *sk)
394 {
395 struct j1939_sock *jsk = j1939_sk(sk);
396
397 /* Ensure that "sk" is first member in "struct j1939_sock", so that we
398 * can skip it during memset().
399 */
400 BUILD_BUG_ON(offsetof(struct j1939_sock, sk) != 0);
401 memset((void *)jsk + sizeof(jsk->sk), 0x0,
402 sizeof(*jsk) - sizeof(jsk->sk));
403
404 INIT_LIST_HEAD(&jsk->list);
405 init_waitqueue_head(&jsk->waitq);
406 jsk->sk.sk_priority = j1939_to_sk_priority(6);
407 jsk->sk.sk_reuse = 1; /* per default */
408 jsk->addr.sa = J1939_NO_ADDR;
409 jsk->addr.da = J1939_NO_ADDR;
410 jsk->addr.pgn = J1939_NO_PGN;
411 jsk->pgn_rx_filter = J1939_NO_PGN;
412 atomic_set(&jsk->skb_pending, 0);
413 spin_lock_init(&jsk->sk_session_queue_lock);
414 INIT_LIST_HEAD(&jsk->sk_session_queue);
415 spin_lock_init(&jsk->filters_lock);
416
417 /* j1939_sk_sock_destruct() depends on SOCK_RCU_FREE flag */
418 sock_set_flag(sk, SOCK_RCU_FREE);
419 sk->sk_destruct = j1939_sk_sock_destruct;
420 sk->sk_protocol = CAN_J1939;
421
422 return 0;
423 }
424
j1939_sk_sanity_check(struct sockaddr_can * addr,int len)425 static int j1939_sk_sanity_check(struct sockaddr_can *addr, int len)
426 {
427 if (!addr)
428 return -EDESTADDRREQ;
429 if (len < J1939_MIN_NAMELEN)
430 return -EINVAL;
431 if (addr->can_family != AF_CAN)
432 return -EINVAL;
433 if (!addr->can_ifindex)
434 return -ENODEV;
435 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) &&
436 !j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn))
437 return -EINVAL;
438
439 return 0;
440 }
441
j1939_sk_bind(struct socket * sock,struct sockaddr * uaddr,int len)442 static int j1939_sk_bind(struct socket *sock, struct sockaddr *uaddr, int len)
443 {
444 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
445 struct j1939_sock *jsk = j1939_sk(sock->sk);
446 struct j1939_priv *priv;
447 struct sock *sk;
448 struct net *net;
449 int ret = 0;
450
451 ret = j1939_sk_sanity_check(addr, len);
452 if (ret)
453 return ret;
454
455 lock_sock(sock->sk);
456
457 priv = jsk->priv;
458 sk = sock->sk;
459 net = sock_net(sk);
460
461 /* Already bound to an interface? */
462 if (jsk->state & J1939_SOCK_BOUND) {
463 /* A re-bind() to a different interface is not
464 * supported.
465 */
466 if (jsk->ifindex != addr->can_ifindex) {
467 ret = -EINVAL;
468 goto out_release_sock;
469 }
470
471 /* drop old references */
472 j1939_jsk_del(priv, jsk);
473 j1939_local_ecu_put(priv, jsk->addr.src_name, jsk->addr.sa);
474 } else {
475 struct can_ml_priv *can_ml;
476 struct net_device *ndev;
477
478 ndev = dev_get_by_index(net, addr->can_ifindex);
479 if (!ndev) {
480 ret = -ENODEV;
481 goto out_release_sock;
482 }
483
484 can_ml = can_get_ml_priv(ndev);
485 if (!can_ml) {
486 dev_put(ndev);
487 ret = -ENODEV;
488 goto out_release_sock;
489 }
490
491 if (!(ndev->flags & IFF_UP)) {
492 dev_put(ndev);
493 ret = -ENETDOWN;
494 goto out_release_sock;
495 }
496
497 priv = j1939_netdev_start(ndev);
498 dev_put(ndev);
499 if (IS_ERR(priv)) {
500 ret = PTR_ERR(priv);
501 goto out_release_sock;
502 }
503
504 jsk->ifindex = addr->can_ifindex;
505
506 /* the corresponding j1939_priv_put() is called via
507 * sk->sk_destruct, which points to j1939_sk_sock_destruct()
508 */
509 j1939_priv_get(priv);
510 jsk->priv = priv;
511 }
512
513 /* set default transmit pgn */
514 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
515 jsk->pgn_rx_filter = addr->can_addr.j1939.pgn;
516 jsk->addr.src_name = addr->can_addr.j1939.name;
517 jsk->addr.sa = addr->can_addr.j1939.addr;
518
519 /* get new references */
520 ret = j1939_local_ecu_get(priv, jsk->addr.src_name, jsk->addr.sa);
521 if (ret) {
522 j1939_netdev_stop(priv);
523 goto out_release_sock;
524 }
525
526 j1939_jsk_add(priv, jsk);
527
528 out_release_sock: /* fall through */
529 release_sock(sock->sk);
530
531 return ret;
532 }
533
j1939_sk_connect(struct socket * sock,struct sockaddr * uaddr,int len,int flags)534 static int j1939_sk_connect(struct socket *sock, struct sockaddr *uaddr,
535 int len, int flags)
536 {
537 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
538 struct j1939_sock *jsk = j1939_sk(sock->sk);
539 int ret = 0;
540
541 ret = j1939_sk_sanity_check(addr, len);
542 if (ret)
543 return ret;
544
545 lock_sock(sock->sk);
546
547 /* bind() before connect() is mandatory */
548 if (!(jsk->state & J1939_SOCK_BOUND)) {
549 ret = -EINVAL;
550 goto out_release_sock;
551 }
552
553 /* A connect() to a different interface is not supported. */
554 if (jsk->ifindex != addr->can_ifindex) {
555 ret = -EINVAL;
556 goto out_release_sock;
557 }
558
559 if (!addr->can_addr.j1939.name &&
560 addr->can_addr.j1939.addr == J1939_NO_ADDR &&
561 !sock_flag(&jsk->sk, SOCK_BROADCAST)) {
562 /* broadcast, but SO_BROADCAST not set */
563 ret = -EACCES;
564 goto out_release_sock;
565 }
566
567 jsk->addr.dst_name = addr->can_addr.j1939.name;
568 jsk->addr.da = addr->can_addr.j1939.addr;
569
570 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
571 jsk->addr.pgn = addr->can_addr.j1939.pgn;
572
573 jsk->state |= J1939_SOCK_CONNECTED;
574
575 out_release_sock: /* fall through */
576 release_sock(sock->sk);
577
578 return ret;
579 }
580
j1939_sk_sock2sockaddr_can(struct sockaddr_can * addr,const struct j1939_sock * jsk,int peer)581 static void j1939_sk_sock2sockaddr_can(struct sockaddr_can *addr,
582 const struct j1939_sock *jsk, int peer)
583 {
584 /* There are two holes (2 bytes and 3 bytes) to clear to avoid
585 * leaking kernel information to user space.
586 */
587 memset(addr, 0, J1939_MIN_NAMELEN);
588
589 addr->can_family = AF_CAN;
590 addr->can_ifindex = jsk->ifindex;
591 addr->can_addr.j1939.pgn = jsk->addr.pgn;
592 if (peer) {
593 addr->can_addr.j1939.name = jsk->addr.dst_name;
594 addr->can_addr.j1939.addr = jsk->addr.da;
595 } else {
596 addr->can_addr.j1939.name = jsk->addr.src_name;
597 addr->can_addr.j1939.addr = jsk->addr.sa;
598 }
599 }
600
j1939_sk_getname(struct socket * sock,struct sockaddr * uaddr,int peer)601 static int j1939_sk_getname(struct socket *sock, struct sockaddr *uaddr,
602 int peer)
603 {
604 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
605 struct sock *sk = sock->sk;
606 struct j1939_sock *jsk = j1939_sk(sk);
607 int ret = 0;
608
609 lock_sock(sk);
610
611 if (peer && !(jsk->state & J1939_SOCK_CONNECTED)) {
612 ret = -EADDRNOTAVAIL;
613 goto failure;
614 }
615
616 j1939_sk_sock2sockaddr_can(addr, jsk, peer);
617 ret = J1939_MIN_NAMELEN;
618
619 failure:
620 release_sock(sk);
621
622 return ret;
623 }
624
j1939_sk_release(struct socket * sock)625 static int j1939_sk_release(struct socket *sock)
626 {
627 struct sock *sk = sock->sk;
628 struct j1939_sock *jsk;
629
630 if (!sk)
631 return 0;
632
633 lock_sock(sk);
634 jsk = j1939_sk(sk);
635
636 if (jsk->state & J1939_SOCK_BOUND) {
637 struct j1939_priv *priv = jsk->priv;
638
639 if (wait_event_interruptible(jsk->waitq,
640 !j1939_sock_pending_get(&jsk->sk))) {
641 j1939_cancel_active_session(priv, sk);
642 j1939_sk_queue_drop_all(priv, jsk, ESHUTDOWN);
643 }
644
645 j1939_jsk_del(priv, jsk);
646
647 j1939_local_ecu_put(priv, jsk->addr.src_name,
648 jsk->addr.sa);
649
650 j1939_netdev_stop(priv);
651 }
652
653 kfree(jsk->filters);
654 sock_orphan(sk);
655 sock->sk = NULL;
656
657 release_sock(sk);
658 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
659 sock_put(sk);
660
661 return 0;
662 }
663
j1939_sk_setsockopt_flag(struct j1939_sock * jsk,sockptr_t optval,unsigned int optlen,int flag)664 static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, sockptr_t optval,
665 unsigned int optlen, int flag)
666 {
667 int tmp;
668
669 if (optlen != sizeof(tmp))
670 return -EINVAL;
671 if (copy_from_sockptr(&tmp, optval, optlen))
672 return -EFAULT;
673 lock_sock(&jsk->sk);
674 if (tmp)
675 jsk->state |= flag;
676 else
677 jsk->state &= ~flag;
678 release_sock(&jsk->sk);
679 return tmp;
680 }
681
j1939_sk_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)682 static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
683 sockptr_t optval, unsigned int optlen)
684 {
685 struct sock *sk = sock->sk;
686 struct j1939_sock *jsk = j1939_sk(sk);
687 int tmp, count = 0, ret = 0;
688 struct j1939_filter *filters = NULL, *ofilters;
689
690 if (level != SOL_CAN_J1939)
691 return -EINVAL;
692
693 switch (optname) {
694 case SO_J1939_FILTER:
695 if (!sockptr_is_null(optval) && optlen != 0) {
696 struct j1939_filter *f;
697 int c;
698
699 if (optlen % sizeof(*filters) != 0)
700 return -EINVAL;
701
702 if (optlen > J1939_FILTER_MAX *
703 sizeof(struct j1939_filter))
704 return -EINVAL;
705
706 count = optlen / sizeof(*filters);
707 filters = memdup_sockptr(optval, optlen);
708 if (IS_ERR(filters))
709 return PTR_ERR(filters);
710
711 for (f = filters, c = count; c; f++, c--) {
712 f->name &= f->name_mask;
713 f->pgn &= f->pgn_mask;
714 f->addr &= f->addr_mask;
715 }
716 }
717
718 lock_sock(&jsk->sk);
719 spin_lock_bh(&jsk->filters_lock);
720 ofilters = jsk->filters;
721 jsk->filters = filters;
722 jsk->nfilters = count;
723 spin_unlock_bh(&jsk->filters_lock);
724 release_sock(&jsk->sk);
725 kfree(ofilters);
726 return 0;
727 case SO_J1939_PROMISC:
728 return j1939_sk_setsockopt_flag(jsk, optval, optlen,
729 J1939_SOCK_PROMISC);
730 case SO_J1939_ERRQUEUE:
731 ret = j1939_sk_setsockopt_flag(jsk, optval, optlen,
732 J1939_SOCK_ERRQUEUE);
733 if (ret < 0)
734 return ret;
735
736 if (!(jsk->state & J1939_SOCK_ERRQUEUE))
737 skb_queue_purge(&sk->sk_error_queue);
738 return ret;
739 case SO_J1939_SEND_PRIO:
740 if (optlen != sizeof(tmp))
741 return -EINVAL;
742 if (copy_from_sockptr(&tmp, optval, optlen))
743 return -EFAULT;
744 if (tmp < 0 || tmp > 7)
745 return -EDOM;
746 if (tmp < 2 && !capable(CAP_NET_ADMIN))
747 return -EPERM;
748 lock_sock(&jsk->sk);
749 jsk->sk.sk_priority = j1939_to_sk_priority(tmp);
750 release_sock(&jsk->sk);
751 return 0;
752 default:
753 return -ENOPROTOOPT;
754 }
755 }
756
j1939_sk_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)757 static int j1939_sk_getsockopt(struct socket *sock, int level, int optname,
758 char __user *optval, int __user *optlen)
759 {
760 struct sock *sk = sock->sk;
761 struct j1939_sock *jsk = j1939_sk(sk);
762 int ret, ulen;
763 /* set defaults for using 'int' properties */
764 int tmp = 0;
765 int len = sizeof(tmp);
766 void *val = &tmp;
767
768 if (level != SOL_CAN_J1939)
769 return -EINVAL;
770 if (get_user(ulen, optlen))
771 return -EFAULT;
772 if (ulen < 0)
773 return -EINVAL;
774
775 lock_sock(&jsk->sk);
776 switch (optname) {
777 case SO_J1939_PROMISC:
778 tmp = (jsk->state & J1939_SOCK_PROMISC) ? 1 : 0;
779 break;
780 case SO_J1939_ERRQUEUE:
781 tmp = (jsk->state & J1939_SOCK_ERRQUEUE) ? 1 : 0;
782 break;
783 case SO_J1939_SEND_PRIO:
784 tmp = j1939_prio(jsk->sk.sk_priority);
785 break;
786 default:
787 ret = -ENOPROTOOPT;
788 goto no_copy;
789 }
790
791 /* copy to user, based on 'len' & 'val'
792 * but most sockopt's are 'int' properties, and have 'len' & 'val'
793 * left unchanged, but instead modified 'tmp'
794 */
795 if (len > ulen)
796 ret = -EFAULT;
797 else if (put_user(len, optlen))
798 ret = -EFAULT;
799 else if (copy_to_user(optval, val, len))
800 ret = -EFAULT;
801 else
802 ret = 0;
803 no_copy:
804 release_sock(&jsk->sk);
805 return ret;
806 }
807
j1939_sk_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)808 static int j1939_sk_recvmsg(struct socket *sock, struct msghdr *msg,
809 size_t size, int flags)
810 {
811 struct sock *sk = sock->sk;
812 struct sk_buff *skb;
813 struct j1939_sk_buff_cb *skcb;
814 int ret = 0;
815
816 if (flags & ~(MSG_DONTWAIT | MSG_ERRQUEUE | MSG_CMSG_COMPAT))
817 return -EINVAL;
818
819 if (flags & MSG_ERRQUEUE)
820 return sock_recv_errqueue(sock->sk, msg, size, SOL_CAN_J1939,
821 SCM_J1939_ERRQUEUE);
822
823 skb = skb_recv_datagram(sk, flags, &ret);
824 if (!skb)
825 return ret;
826
827 if (size < skb->len)
828 msg->msg_flags |= MSG_TRUNC;
829 else
830 size = skb->len;
831
832 ret = memcpy_to_msg(msg, skb->data, size);
833 if (ret < 0) {
834 skb_free_datagram(sk, skb);
835 return ret;
836 }
837
838 skcb = j1939_skb_to_cb(skb);
839 if (j1939_address_is_valid(skcb->addr.da))
840 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_ADDR,
841 sizeof(skcb->addr.da), &skcb->addr.da);
842
843 if (skcb->addr.dst_name)
844 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_NAME,
845 sizeof(skcb->addr.dst_name), &skcb->addr.dst_name);
846
847 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_PRIO,
848 sizeof(skcb->priority), &skcb->priority);
849
850 if (msg->msg_name) {
851 struct sockaddr_can *paddr = msg->msg_name;
852
853 msg->msg_namelen = J1939_MIN_NAMELEN;
854 memset(msg->msg_name, 0, msg->msg_namelen);
855 paddr->can_family = AF_CAN;
856 paddr->can_ifindex = skb->skb_iif;
857 paddr->can_addr.j1939.name = skcb->addr.src_name;
858 paddr->can_addr.j1939.addr = skcb->addr.sa;
859 paddr->can_addr.j1939.pgn = skcb->addr.pgn;
860 }
861
862 sock_recv_cmsgs(msg, sk, skb);
863 msg->msg_flags |= skcb->msg_flags;
864 skb_free_datagram(sk, skb);
865
866 return size;
867 }
868
j1939_sk_alloc_skb(struct net_device * ndev,struct sock * sk,struct msghdr * msg,size_t size,int * errcode)869 static struct sk_buff *j1939_sk_alloc_skb(struct net_device *ndev,
870 struct sock *sk,
871 struct msghdr *msg, size_t size,
872 int *errcode)
873 {
874 struct j1939_sock *jsk = j1939_sk(sk);
875 struct j1939_sk_buff_cb *skcb;
876 struct sk_buff *skb;
877 int ret;
878
879 skb = sock_alloc_send_skb(sk,
880 size +
881 sizeof(struct can_frame) -
882 sizeof(((struct can_frame *)NULL)->data) +
883 sizeof(struct can_skb_priv),
884 msg->msg_flags & MSG_DONTWAIT, &ret);
885 if (!skb)
886 goto failure;
887
888 can_skb_reserve(skb);
889 can_skb_prv(skb)->ifindex = ndev->ifindex;
890 can_skb_prv(skb)->skbcnt = 0;
891 skb_reserve(skb, offsetof(struct can_frame, data));
892
893 ret = memcpy_from_msg(skb_put(skb, size), msg, size);
894 if (ret < 0)
895 goto free_skb;
896
897 skb->dev = ndev;
898
899 skcb = j1939_skb_to_cb(skb);
900 memset(skcb, 0, sizeof(*skcb));
901 skcb->addr = jsk->addr;
902 skcb->priority = j1939_prio(READ_ONCE(sk->sk_priority));
903
904 if (msg->msg_name) {
905 struct sockaddr_can *addr = msg->msg_name;
906
907 if (addr->can_addr.j1939.name ||
908 addr->can_addr.j1939.addr != J1939_NO_ADDR) {
909 skcb->addr.dst_name = addr->can_addr.j1939.name;
910 skcb->addr.da = addr->can_addr.j1939.addr;
911 }
912 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
913 skcb->addr.pgn = addr->can_addr.j1939.pgn;
914 }
915
916 *errcode = ret;
917 return skb;
918
919 free_skb:
920 kfree_skb(skb);
921 failure:
922 *errcode = ret;
923 return NULL;
924 }
925
j1939_sk_opt_stats_get_size(enum j1939_sk_errqueue_type type)926 static size_t j1939_sk_opt_stats_get_size(enum j1939_sk_errqueue_type type)
927 {
928 switch (type) {
929 case J1939_ERRQUEUE_RX_RTS:
930 return
931 nla_total_size(sizeof(u32)) + /* J1939_NLA_TOTAL_SIZE */
932 nla_total_size(sizeof(u32)) + /* J1939_NLA_PGN */
933 nla_total_size(sizeof(u64)) + /* J1939_NLA_SRC_NAME */
934 nla_total_size(sizeof(u64)) + /* J1939_NLA_DEST_NAME */
935 nla_total_size(sizeof(u8)) + /* J1939_NLA_SRC_ADDR */
936 nla_total_size(sizeof(u8)) + /* J1939_NLA_DEST_ADDR */
937 0;
938 default:
939 return
940 nla_total_size(sizeof(u32)) + /* J1939_NLA_BYTES_ACKED */
941 0;
942 }
943 }
944
945 static struct sk_buff *
j1939_sk_get_timestamping_opt_stats(struct j1939_session * session,enum j1939_sk_errqueue_type type)946 j1939_sk_get_timestamping_opt_stats(struct j1939_session *session,
947 enum j1939_sk_errqueue_type type)
948 {
949 struct sk_buff *stats;
950 u32 size;
951
952 stats = alloc_skb(j1939_sk_opt_stats_get_size(type), GFP_ATOMIC);
953 if (!stats)
954 return NULL;
955
956 if (session->skcb.addr.type == J1939_SIMPLE)
957 size = session->total_message_size;
958 else
959 size = min(session->pkt.tx_acked * 7,
960 session->total_message_size);
961
962 switch (type) {
963 case J1939_ERRQUEUE_RX_RTS:
964 nla_put_u32(stats, J1939_NLA_TOTAL_SIZE,
965 session->total_message_size);
966 nla_put_u32(stats, J1939_NLA_PGN,
967 session->skcb.addr.pgn);
968 nla_put_u64_64bit(stats, J1939_NLA_SRC_NAME,
969 session->skcb.addr.src_name, J1939_NLA_PAD);
970 nla_put_u64_64bit(stats, J1939_NLA_DEST_NAME,
971 session->skcb.addr.dst_name, J1939_NLA_PAD);
972 nla_put_u8(stats, J1939_NLA_SRC_ADDR,
973 session->skcb.addr.sa);
974 nla_put_u8(stats, J1939_NLA_DEST_ADDR,
975 session->skcb.addr.da);
976 break;
977 default:
978 nla_put_u32(stats, J1939_NLA_BYTES_ACKED, size);
979 }
980
981 return stats;
982 }
983
__j1939_sk_errqueue(struct j1939_session * session,struct sock * sk,enum j1939_sk_errqueue_type type)984 static void __j1939_sk_errqueue(struct j1939_session *session, struct sock *sk,
985 enum j1939_sk_errqueue_type type)
986 {
987 struct j1939_priv *priv = session->priv;
988 struct j1939_sock *jsk;
989 struct sock_exterr_skb *serr;
990 struct sk_buff *skb;
991 char *state = "UNK";
992 u32 tsflags;
993 int err;
994
995 jsk = j1939_sk(sk);
996
997 if (!(jsk->state & J1939_SOCK_ERRQUEUE))
998 return;
999
1000 tsflags = READ_ONCE(sk->sk_tsflags);
1001 switch (type) {
1002 case J1939_ERRQUEUE_TX_ACK:
1003 if (!(tsflags & SOF_TIMESTAMPING_TX_ACK))
1004 return;
1005 break;
1006 case J1939_ERRQUEUE_TX_SCHED:
1007 if (!(tsflags & SOF_TIMESTAMPING_TX_SCHED))
1008 return;
1009 break;
1010 case J1939_ERRQUEUE_TX_ABORT:
1011 break;
1012 case J1939_ERRQUEUE_RX_RTS:
1013 fallthrough;
1014 case J1939_ERRQUEUE_RX_DPO:
1015 fallthrough;
1016 case J1939_ERRQUEUE_RX_ABORT:
1017 if (!(tsflags & SOF_TIMESTAMPING_RX_SOFTWARE))
1018 return;
1019 break;
1020 default:
1021 netdev_err(priv->ndev, "Unknown errqueue type %i\n", type);
1022 }
1023
1024 skb = j1939_sk_get_timestamping_opt_stats(session, type);
1025 if (!skb)
1026 return;
1027
1028 skb->tstamp = ktime_get_real();
1029
1030 BUILD_BUG_ON(sizeof(struct sock_exterr_skb) > sizeof(skb->cb));
1031
1032 serr = SKB_EXT_ERR(skb);
1033 memset(serr, 0, sizeof(*serr));
1034 switch (type) {
1035 case J1939_ERRQUEUE_TX_ACK:
1036 serr->ee.ee_errno = ENOMSG;
1037 serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
1038 serr->ee.ee_info = SCM_TSTAMP_ACK;
1039 state = "TX ACK";
1040 break;
1041 case J1939_ERRQUEUE_TX_SCHED:
1042 serr->ee.ee_errno = ENOMSG;
1043 serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
1044 serr->ee.ee_info = SCM_TSTAMP_SCHED;
1045 state = "TX SCH";
1046 break;
1047 case J1939_ERRQUEUE_TX_ABORT:
1048 serr->ee.ee_errno = session->err;
1049 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
1050 serr->ee.ee_info = J1939_EE_INFO_TX_ABORT;
1051 state = "TX ABT";
1052 break;
1053 case J1939_ERRQUEUE_RX_RTS:
1054 serr->ee.ee_errno = ENOMSG;
1055 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
1056 serr->ee.ee_info = J1939_EE_INFO_RX_RTS;
1057 state = "RX RTS";
1058 break;
1059 case J1939_ERRQUEUE_RX_DPO:
1060 serr->ee.ee_errno = ENOMSG;
1061 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
1062 serr->ee.ee_info = J1939_EE_INFO_RX_DPO;
1063 state = "RX DPO";
1064 break;
1065 case J1939_ERRQUEUE_RX_ABORT:
1066 serr->ee.ee_errno = session->err;
1067 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
1068 serr->ee.ee_info = J1939_EE_INFO_RX_ABORT;
1069 state = "RX ABT";
1070 break;
1071 }
1072
1073 serr->opt_stats = true;
1074 if (tsflags & SOF_TIMESTAMPING_OPT_ID)
1075 serr->ee.ee_data = session->tskey;
1076
1077 netdev_dbg(session->priv->ndev, "%s: 0x%p tskey: %i, state: %s\n",
1078 __func__, session, session->tskey, state);
1079 err = sock_queue_err_skb(sk, skb);
1080
1081 if (err)
1082 kfree_skb(skb);
1083 };
1084
j1939_sk_errqueue(struct j1939_session * session,enum j1939_sk_errqueue_type type)1085 void j1939_sk_errqueue(struct j1939_session *session,
1086 enum j1939_sk_errqueue_type type)
1087 {
1088 struct j1939_priv *priv = session->priv;
1089 struct j1939_sock *jsk;
1090
1091 if (session->sk) {
1092 /* send TX notifications to the socket of origin */
1093 __j1939_sk_errqueue(session, session->sk, type);
1094 return;
1095 }
1096
1097 /* spread RX notifications to all sockets subscribed to this session */
1098 read_lock_bh(&priv->j1939_socks_lock);
1099 list_for_each_entry(jsk, &priv->j1939_socks, list) {
1100 if (j1939_sk_recv_match_one(jsk, &session->skcb))
1101 __j1939_sk_errqueue(session, &jsk->sk, type);
1102 }
1103 read_unlock_bh(&priv->j1939_socks_lock);
1104 };
1105
j1939_sk_send_loop_abort(struct sock * sk,int err)1106 void j1939_sk_send_loop_abort(struct sock *sk, int err)
1107 {
1108 struct j1939_sock *jsk = j1939_sk(sk);
1109
1110 if (jsk->state & J1939_SOCK_ERRQUEUE)
1111 return;
1112
1113 sk->sk_err = err;
1114
1115 sk_error_report(sk);
1116 }
1117
j1939_sk_send_loop(struct j1939_priv * priv,struct sock * sk,struct msghdr * msg,size_t size)1118 static int j1939_sk_send_loop(struct j1939_priv *priv, struct sock *sk,
1119 struct msghdr *msg, size_t size)
1120
1121 {
1122 struct j1939_sock *jsk = j1939_sk(sk);
1123 struct j1939_session *session = j1939_sk_get_incomplete_session(jsk);
1124 struct sk_buff *skb;
1125 size_t segment_size, todo_size;
1126 int ret = 0;
1127
1128 if (session &&
1129 session->total_message_size != session->total_queued_size + size) {
1130 j1939_session_put(session);
1131 return -EIO;
1132 }
1133
1134 todo_size = size;
1135
1136 do {
1137 struct j1939_sk_buff_cb *skcb;
1138
1139 segment_size = min_t(size_t, J1939_MAX_TP_PACKET_SIZE,
1140 todo_size);
1141
1142 /* Allocate skb for one segment */
1143 skb = j1939_sk_alloc_skb(priv->ndev, sk, msg, segment_size,
1144 &ret);
1145 if (ret)
1146 break;
1147
1148 skcb = j1939_skb_to_cb(skb);
1149
1150 if (!session) {
1151 /* at this point the size should be full size
1152 * of the session
1153 */
1154 skcb->offset = 0;
1155 session = j1939_tp_send(priv, skb, size);
1156 if (IS_ERR(session)) {
1157 ret = PTR_ERR(session);
1158 goto kfree_skb;
1159 }
1160 if (j1939_sk_queue_session(session)) {
1161 /* try to activate session if we a
1162 * fist in the queue
1163 */
1164 if (!j1939_session_activate(session)) {
1165 j1939_tp_schedule_txtimer(session, 0);
1166 } else {
1167 ret = -EBUSY;
1168 session->err = ret;
1169 j1939_sk_queue_drop_all(priv, jsk,
1170 EBUSY);
1171 break;
1172 }
1173 }
1174 } else {
1175 skcb->offset = session->total_queued_size;
1176 j1939_session_skb_queue(session, skb);
1177 }
1178
1179 todo_size -= segment_size;
1180 session->total_queued_size += segment_size;
1181 } while (todo_size);
1182
1183 switch (ret) {
1184 case 0: /* OK */
1185 if (todo_size)
1186 netdev_warn(priv->ndev,
1187 "no error found and not completely queued?! %zu\n",
1188 todo_size);
1189 ret = size;
1190 break;
1191 case -ERESTARTSYS:
1192 ret = -EINTR;
1193 fallthrough;
1194 case -EAGAIN: /* OK */
1195 if (todo_size != size)
1196 ret = size - todo_size;
1197 break;
1198 default: /* ERROR */
1199 break;
1200 }
1201
1202 if (session)
1203 j1939_session_put(session);
1204
1205 return ret;
1206
1207 kfree_skb:
1208 kfree_skb(skb);
1209 return ret;
1210 }
1211
j1939_sk_sendmsg(struct socket * sock,struct msghdr * msg,size_t size)1212 static int j1939_sk_sendmsg(struct socket *sock, struct msghdr *msg,
1213 size_t size)
1214 {
1215 struct sock *sk = sock->sk;
1216 struct j1939_sock *jsk = j1939_sk(sk);
1217 struct j1939_priv *priv;
1218 int ifindex;
1219 int ret;
1220
1221 lock_sock(sock->sk);
1222 /* various socket state tests */
1223 if (!(jsk->state & J1939_SOCK_BOUND)) {
1224 ret = -EBADFD;
1225 goto sendmsg_done;
1226 }
1227
1228 priv = jsk->priv;
1229 ifindex = jsk->ifindex;
1230
1231 if (!jsk->addr.src_name && jsk->addr.sa == J1939_NO_ADDR) {
1232 /* no source address assigned yet */
1233 ret = -EBADFD;
1234 goto sendmsg_done;
1235 }
1236
1237 /* deal with provided destination address info */
1238 if (msg->msg_name) {
1239 struct sockaddr_can *addr = msg->msg_name;
1240
1241 if (msg->msg_namelen < J1939_MIN_NAMELEN) {
1242 ret = -EINVAL;
1243 goto sendmsg_done;
1244 }
1245
1246 if (addr->can_family != AF_CAN) {
1247 ret = -EINVAL;
1248 goto sendmsg_done;
1249 }
1250
1251 if (addr->can_ifindex && addr->can_ifindex != ifindex) {
1252 ret = -EBADFD;
1253 goto sendmsg_done;
1254 }
1255
1256 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) &&
1257 !j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn)) {
1258 ret = -EINVAL;
1259 goto sendmsg_done;
1260 }
1261
1262 if (!addr->can_addr.j1939.name &&
1263 addr->can_addr.j1939.addr == J1939_NO_ADDR &&
1264 !sock_flag(sk, SOCK_BROADCAST)) {
1265 /* broadcast, but SO_BROADCAST not set */
1266 ret = -EACCES;
1267 goto sendmsg_done;
1268 }
1269 } else {
1270 if (!jsk->addr.dst_name && jsk->addr.da == J1939_NO_ADDR &&
1271 !sock_flag(sk, SOCK_BROADCAST)) {
1272 /* broadcast, but SO_BROADCAST not set */
1273 ret = -EACCES;
1274 goto sendmsg_done;
1275 }
1276 }
1277
1278 ret = j1939_sk_send_loop(priv, sk, msg, size);
1279
1280 sendmsg_done:
1281 release_sock(sock->sk);
1282
1283 return ret;
1284 }
1285
j1939_sk_netdev_event_netdown(struct j1939_priv * priv)1286 void j1939_sk_netdev_event_netdown(struct j1939_priv *priv)
1287 {
1288 struct j1939_sock *jsk;
1289 int error_code = ENETDOWN;
1290
1291 read_lock_bh(&priv->j1939_socks_lock);
1292 list_for_each_entry(jsk, &priv->j1939_socks, list) {
1293 jsk->sk.sk_err = error_code;
1294 if (!sock_flag(&jsk->sk, SOCK_DEAD))
1295 sk_error_report(&jsk->sk);
1296
1297 j1939_sk_queue_drop_all(priv, jsk, error_code);
1298 }
1299 read_unlock_bh(&priv->j1939_socks_lock);
1300 }
1301
j1939_sk_no_ioctlcmd(struct socket * sock,unsigned int cmd,unsigned long arg)1302 static int j1939_sk_no_ioctlcmd(struct socket *sock, unsigned int cmd,
1303 unsigned long arg)
1304 {
1305 /* no ioctls for socket layer -> hand it down to NIC layer */
1306 return -ENOIOCTLCMD;
1307 }
1308
1309 static const struct proto_ops j1939_ops = {
1310 .family = PF_CAN,
1311 .release = j1939_sk_release,
1312 .bind = j1939_sk_bind,
1313 .connect = j1939_sk_connect,
1314 .socketpair = sock_no_socketpair,
1315 .accept = sock_no_accept,
1316 .getname = j1939_sk_getname,
1317 .poll = datagram_poll,
1318 .ioctl = j1939_sk_no_ioctlcmd,
1319 .listen = sock_no_listen,
1320 .shutdown = sock_no_shutdown,
1321 .setsockopt = j1939_sk_setsockopt,
1322 .getsockopt = j1939_sk_getsockopt,
1323 .sendmsg = j1939_sk_sendmsg,
1324 .recvmsg = j1939_sk_recvmsg,
1325 .mmap = sock_no_mmap,
1326 };
1327
1328 static struct proto j1939_proto __read_mostly = {
1329 .name = "CAN_J1939",
1330 .owner = THIS_MODULE,
1331 .obj_size = sizeof(struct j1939_sock),
1332 .init = j1939_sk_init,
1333 };
1334
1335 const struct can_proto j1939_can_proto = {
1336 .type = SOCK_DGRAM,
1337 .protocol = CAN_J1939,
1338 .ops = &j1939_ops,
1339 .prot = &j1939_proto,
1340 };
1341