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1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2/* raw.c - Raw sockets for protocol family CAN
3 *
4 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of Volkswagen nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above.
23 *
24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules with a GPL compatible license.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
38 * DAMAGE.
39 *
40 */
41
42#include <linux/module.h>
43#include <linux/init.h>
44#include <linux/uio.h>
45#include <linux/net.h>
46#include <linux/slab.h>
47#include <linux/netdevice.h>
48#include <linux/socket.h>
49#include <linux/if_arp.h>
50#include <linux/skbuff.h>
51#include <linux/can.h>
52#include <linux/can/core.h>
53#include <linux/can/dev.h> /* for can_is_canxl_dev_mtu() */
54#include <linux/can/skb.h>
55#include <linux/can/raw.h>
56#include <net/sock.h>
57#include <net/net_namespace.h>
58
59MODULE_DESCRIPTION("PF_CAN raw protocol");
60MODULE_LICENSE("Dual BSD/GPL");
61MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
62MODULE_ALIAS("can-proto-1");
63
64#define RAW_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_ifindex)
65
66#define MASK_ALL 0
67
68/* A raw socket has a list of can_filters attached to it, each receiving
69 * the CAN frames matching that filter. If the filter list is empty,
70 * no CAN frames will be received by the socket. The default after
71 * opening the socket, is to have one filter which receives all frames.
72 * The filter list is allocated dynamically with the exception of the
73 * list containing only one item. This common case is optimized by
74 * storing the single filter in dfilter, to avoid using dynamic memory.
75 */
76
77struct uniqframe {
78 int skbcnt;
79 const struct sk_buff *skb;
80 unsigned int join_rx_count;
81};
82
83struct raw_sock {
84 struct sock sk;
85 int bound;
86 int ifindex;
87 struct net_device *dev;
88 netdevice_tracker dev_tracker;
89 struct list_head notifier;
90 int loopback;
91 int recv_own_msgs;
92 int fd_frames;
93 int xl_frames;
94 struct can_raw_vcid_options raw_vcid_opts;
95 canid_t tx_vcid_shifted;
96 canid_t rx_vcid_shifted;
97 canid_t rx_vcid_mask_shifted;
98 int join_filters;
99 int count; /* number of active filters */
100 struct can_filter dfilter; /* default/single filter */
101 struct can_filter *filter; /* pointer to filter(s) */
102 can_err_mask_t err_mask;
103 struct uniqframe __percpu *uniq;
104};
105
106static LIST_HEAD(raw_notifier_list);
107static DEFINE_SPINLOCK(raw_notifier_lock);
108static struct raw_sock *raw_busy_notifier;
109
110/* Return pointer to store the extra msg flags for raw_recvmsg().
111 * We use the space of one unsigned int beyond the 'struct sockaddr_can'
112 * in skb->cb.
113 */
114static inline unsigned int *raw_flags(struct sk_buff *skb)
115{
116 sock_skb_cb_check_size(sizeof(struct sockaddr_can) +
117 sizeof(unsigned int));
118
119 /* return pointer after struct sockaddr_can */
120 return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
121}
122
123static inline struct raw_sock *raw_sk(const struct sock *sk)
124{
125 return (struct raw_sock *)sk;
126}
127
128static void raw_rcv(struct sk_buff *oskb, void *data)
129{
130 struct sock *sk = (struct sock *)data;
131 struct raw_sock *ro = raw_sk(sk);
132 struct sockaddr_can *addr;
133 struct sk_buff *skb;
134 unsigned int *pflags;
135
136 /* check the received tx sock reference */
137 if (!ro->recv_own_msgs && oskb->sk == sk)
138 return;
139
140 /* make sure to not pass oversized frames to the socket */
141 if (!ro->fd_frames && can_is_canfd_skb(oskb))
142 return;
143
144 if (can_is_canxl_skb(oskb)) {
145 struct canxl_frame *cxl = (struct canxl_frame *)oskb->data;
146
147 /* make sure to not pass oversized frames to the socket */
148 if (!ro->xl_frames)
149 return;
150
151 /* filter CAN XL VCID content */
152 if (ro->raw_vcid_opts.flags & CAN_RAW_XL_VCID_RX_FILTER) {
153 /* apply VCID filter if user enabled the filter */
154 if ((cxl->prio & ro->rx_vcid_mask_shifted) !=
155 (ro->rx_vcid_shifted & ro->rx_vcid_mask_shifted))
156 return;
157 } else {
158 /* no filter => do not forward VCID tagged frames */
159 if (cxl->prio & CANXL_VCID_MASK)
160 return;
161 }
162 }
163
164 /* eliminate multiple filter matches for the same skb */
165 if (this_cpu_ptr(ro->uniq)->skb == oskb &&
166 this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
167 if (!ro->join_filters)
168 return;
169
170 this_cpu_inc(ro->uniq->join_rx_count);
171 /* drop frame until all enabled filters matched */
172 if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count)
173 return;
174 } else {
175 this_cpu_ptr(ro->uniq)->skb = oskb;
176 this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
177 this_cpu_ptr(ro->uniq)->join_rx_count = 1;
178 /* drop first frame to check all enabled filters? */
179 if (ro->join_filters && ro->count > 1)
180 return;
181 }
182
183 /* clone the given skb to be able to enqueue it into the rcv queue */
184 skb = skb_clone(oskb, GFP_ATOMIC);
185 if (!skb)
186 return;
187
188 /* Put the datagram to the queue so that raw_recvmsg() can get
189 * it from there. We need to pass the interface index to
190 * raw_recvmsg(). We pass a whole struct sockaddr_can in
191 * skb->cb containing the interface index.
192 */
193
194 sock_skb_cb_check_size(sizeof(struct sockaddr_can));
195 addr = (struct sockaddr_can *)skb->cb;
196 memset(addr, 0, sizeof(*addr));
197 addr->can_family = AF_CAN;
198 addr->can_ifindex = skb->dev->ifindex;
199
200 /* add CAN specific message flags for raw_recvmsg() */
201 pflags = raw_flags(skb);
202 *pflags = 0;
203 if (oskb->sk)
204 *pflags |= MSG_DONTROUTE;
205 if (oskb->sk == sk)
206 *pflags |= MSG_CONFIRM;
207
208 if (sock_queue_rcv_skb(sk, skb) < 0)
209 kfree_skb(skb);
210}
211
212static int raw_enable_filters(struct net *net, struct net_device *dev,
213 struct sock *sk, struct can_filter *filter,
214 int count)
215{
216 int err = 0;
217 int i;
218
219 for (i = 0; i < count; i++) {
220 err = can_rx_register(net, dev, filter[i].can_id,
221 filter[i].can_mask,
222 raw_rcv, sk, "raw", sk);
223 if (err) {
224 /* clean up successfully registered filters */
225 while (--i >= 0)
226 can_rx_unregister(net, dev, filter[i].can_id,
227 filter[i].can_mask,
228 raw_rcv, sk);
229 break;
230 }
231 }
232
233 return err;
234}
235
236static int raw_enable_errfilter(struct net *net, struct net_device *dev,
237 struct sock *sk, can_err_mask_t err_mask)
238{
239 int err = 0;
240
241 if (err_mask)
242 err = can_rx_register(net, dev, 0, err_mask | CAN_ERR_FLAG,
243 raw_rcv, sk, "raw", sk);
244
245 return err;
246}
247
248static void raw_disable_filters(struct net *net, struct net_device *dev,
249 struct sock *sk, struct can_filter *filter,
250 int count)
251{
252 int i;
253
254 for (i = 0; i < count; i++)
255 can_rx_unregister(net, dev, filter[i].can_id,
256 filter[i].can_mask, raw_rcv, sk);
257}
258
259static inline void raw_disable_errfilter(struct net *net,
260 struct net_device *dev,
261 struct sock *sk,
262 can_err_mask_t err_mask)
263
264{
265 if (err_mask)
266 can_rx_unregister(net, dev, 0, err_mask | CAN_ERR_FLAG,
267 raw_rcv, sk);
268}
269
270static inline void raw_disable_allfilters(struct net *net,
271 struct net_device *dev,
272 struct sock *sk)
273{
274 struct raw_sock *ro = raw_sk(sk);
275
276 raw_disable_filters(net, dev, sk, ro->filter, ro->count);
277 raw_disable_errfilter(net, dev, sk, ro->err_mask);
278}
279
280static int raw_enable_allfilters(struct net *net, struct net_device *dev,
281 struct sock *sk)
282{
283 struct raw_sock *ro = raw_sk(sk);
284 int err;
285
286 err = raw_enable_filters(net, dev, sk, ro->filter, ro->count);
287 if (!err) {
288 err = raw_enable_errfilter(net, dev, sk, ro->err_mask);
289 if (err)
290 raw_disable_filters(net, dev, sk, ro->filter,
291 ro->count);
292 }
293
294 return err;
295}
296
297static void raw_notify(struct raw_sock *ro, unsigned long msg,
298 struct net_device *dev)
299{
300 struct sock *sk = &ro->sk;
301
302 if (!net_eq(dev_net(dev), sock_net(sk)))
303 return;
304
305 if (ro->dev != dev)
306 return;
307
308 switch (msg) {
309 case NETDEV_UNREGISTER:
310 lock_sock(sk);
311 /* remove current filters & unregister */
312 if (ro->bound) {
313 raw_disable_allfilters(dev_net(dev), dev, sk);
314 netdev_put(dev, &ro->dev_tracker);
315 }
316
317 if (ro->count > 1)
318 kfree(ro->filter);
319
320 ro->ifindex = 0;
321 ro->bound = 0;
322 ro->dev = NULL;
323 ro->count = 0;
324 release_sock(sk);
325
326 sk->sk_err = ENODEV;
327 if (!sock_flag(sk, SOCK_DEAD))
328 sk_error_report(sk);
329 break;
330
331 case NETDEV_DOWN:
332 sk->sk_err = ENETDOWN;
333 if (!sock_flag(sk, SOCK_DEAD))
334 sk_error_report(sk);
335 break;
336 }
337}
338
339static int raw_notifier(struct notifier_block *nb, unsigned long msg,
340 void *ptr)
341{
342 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
343
344 if (dev->type != ARPHRD_CAN)
345 return NOTIFY_DONE;
346 if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
347 return NOTIFY_DONE;
348 if (unlikely(raw_busy_notifier)) /* Check for reentrant bug. */
349 return NOTIFY_DONE;
350
351 spin_lock(&raw_notifier_lock);
352 list_for_each_entry(raw_busy_notifier, &raw_notifier_list, notifier) {
353 spin_unlock(&raw_notifier_lock);
354 raw_notify(raw_busy_notifier, msg, dev);
355 spin_lock(&raw_notifier_lock);
356 }
357 raw_busy_notifier = NULL;
358 spin_unlock(&raw_notifier_lock);
359 return NOTIFY_DONE;
360}
361
362static int raw_init(struct sock *sk)
363{
364 struct raw_sock *ro = raw_sk(sk);
365
366 ro->bound = 0;
367 ro->ifindex = 0;
368 ro->dev = NULL;
369
370 /* set default filter to single entry dfilter */
371 ro->dfilter.can_id = 0;
372 ro->dfilter.can_mask = MASK_ALL;
373 ro->filter = &ro->dfilter;
374 ro->count = 1;
375
376 /* set default loopback behaviour */
377 ro->loopback = 1;
378 ro->recv_own_msgs = 0;
379 ro->fd_frames = 0;
380 ro->xl_frames = 0;
381 ro->join_filters = 0;
382
383 /* alloc_percpu provides zero'ed memory */
384 ro->uniq = alloc_percpu(struct uniqframe);
385 if (unlikely(!ro->uniq))
386 return -ENOMEM;
387
388 /* set notifier */
389 spin_lock(&raw_notifier_lock);
390 list_add_tail(&ro->notifier, &raw_notifier_list);
391 spin_unlock(&raw_notifier_lock);
392
393 return 0;
394}
395
396static int raw_release(struct socket *sock)
397{
398 struct sock *sk = sock->sk;
399 struct raw_sock *ro;
400
401 if (!sk)
402 return 0;
403
404 ro = raw_sk(sk);
405
406 spin_lock(&raw_notifier_lock);
407 while (raw_busy_notifier == ro) {
408 spin_unlock(&raw_notifier_lock);
409 schedule_timeout_uninterruptible(1);
410 spin_lock(&raw_notifier_lock);
411 }
412 list_del(&ro->notifier);
413 spin_unlock(&raw_notifier_lock);
414
415 rtnl_lock();
416 lock_sock(sk);
417
418 /* remove current filters & unregister */
419 if (ro->bound) {
420 if (ro->dev) {
421 raw_disable_allfilters(dev_net(ro->dev), ro->dev, sk);
422 netdev_put(ro->dev, &ro->dev_tracker);
423 } else {
424 raw_disable_allfilters(sock_net(sk), NULL, sk);
425 }
426 }
427
428 if (ro->count > 1)
429 kfree(ro->filter);
430
431 ro->ifindex = 0;
432 ro->bound = 0;
433 ro->dev = NULL;
434 ro->count = 0;
435 free_percpu(ro->uniq);
436
437 sock_orphan(sk);
438 sock->sk = NULL;
439
440 release_sock(sk);
441 rtnl_unlock();
442
443 sock_put(sk);
444
445 return 0;
446}
447
448static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
449{
450 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
451 struct sock *sk = sock->sk;
452 struct raw_sock *ro = raw_sk(sk);
453 struct net_device *dev = NULL;
454 int ifindex;
455 int err = 0;
456 int notify_enetdown = 0;
457
458 if (len < RAW_MIN_NAMELEN)
459 return -EINVAL;
460 if (addr->can_family != AF_CAN)
461 return -EINVAL;
462
463 rtnl_lock();
464 lock_sock(sk);
465
466 if (ro->bound && addr->can_ifindex == ro->ifindex)
467 goto out;
468
469 if (addr->can_ifindex) {
470 dev = dev_get_by_index(sock_net(sk), addr->can_ifindex);
471 if (!dev) {
472 err = -ENODEV;
473 goto out;
474 }
475 if (dev->type != ARPHRD_CAN) {
476 err = -ENODEV;
477 goto out_put_dev;
478 }
479
480 if (!(dev->flags & IFF_UP))
481 notify_enetdown = 1;
482
483 ifindex = dev->ifindex;
484
485 /* filters set by default/setsockopt */
486 err = raw_enable_allfilters(sock_net(sk), dev, sk);
487 if (err)
488 goto out_put_dev;
489
490 } else {
491 ifindex = 0;
492
493 /* filters set by default/setsockopt */
494 err = raw_enable_allfilters(sock_net(sk), NULL, sk);
495 }
496
497 if (!err) {
498 if (ro->bound) {
499 /* unregister old filters */
500 if (ro->dev) {
501 raw_disable_allfilters(dev_net(ro->dev),
502 ro->dev, sk);
503 /* drop reference to old ro->dev */
504 netdev_put(ro->dev, &ro->dev_tracker);
505 } else {
506 raw_disable_allfilters(sock_net(sk), NULL, sk);
507 }
508 }
509 ro->ifindex = ifindex;
510 ro->bound = 1;
511 /* bind() ok -> hold a reference for new ro->dev */
512 ro->dev = dev;
513 if (ro->dev)
514 netdev_hold(ro->dev, &ro->dev_tracker, GFP_KERNEL);
515 }
516
517out_put_dev:
518 /* remove potential reference from dev_get_by_index() */
519 dev_put(dev);
520out:
521 release_sock(sk);
522 rtnl_unlock();
523
524 if (notify_enetdown) {
525 sk->sk_err = ENETDOWN;
526 if (!sock_flag(sk, SOCK_DEAD))
527 sk_error_report(sk);
528 }
529
530 return err;
531}
532
533static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
534 int peer)
535{
536 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
537 struct sock *sk = sock->sk;
538 struct raw_sock *ro = raw_sk(sk);
539
540 if (peer)
541 return -EOPNOTSUPP;
542
543 memset(addr, 0, RAW_MIN_NAMELEN);
544 addr->can_family = AF_CAN;
545 addr->can_ifindex = ro->ifindex;
546
547 return RAW_MIN_NAMELEN;
548}
549
550static int raw_setsockopt(struct socket *sock, int level, int optname,
551 sockptr_t optval, unsigned int optlen)
552{
553 struct sock *sk = sock->sk;
554 struct raw_sock *ro = raw_sk(sk);
555 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
556 struct can_filter sfilter; /* single filter */
557 struct net_device *dev = NULL;
558 can_err_mask_t err_mask = 0;
559 int fd_frames;
560 int count = 0;
561 int err = 0;
562
563 if (level != SOL_CAN_RAW)
564 return -EINVAL;
565
566 switch (optname) {
567 case CAN_RAW_FILTER:
568 if (optlen % sizeof(struct can_filter) != 0)
569 return -EINVAL;
570
571 if (optlen > CAN_RAW_FILTER_MAX * sizeof(struct can_filter))
572 return -EINVAL;
573
574 count = optlen / sizeof(struct can_filter);
575
576 if (count > 1) {
577 /* filter does not fit into dfilter => alloc space */
578 filter = memdup_sockptr(optval, optlen);
579 if (IS_ERR(filter))
580 return PTR_ERR(filter);
581 } else if (count == 1) {
582 if (copy_from_sockptr(&sfilter, optval, sizeof(sfilter)))
583 return -EFAULT;
584 }
585
586 rtnl_lock();
587 lock_sock(sk);
588
589 dev = ro->dev;
590 if (ro->bound && dev) {
591 if (dev->reg_state != NETREG_REGISTERED) {
592 if (count > 1)
593 kfree(filter);
594 err = -ENODEV;
595 goto out_fil;
596 }
597 }
598
599 if (ro->bound) {
600 /* (try to) register the new filters */
601 if (count == 1)
602 err = raw_enable_filters(sock_net(sk), dev, sk,
603 &sfilter, 1);
604 else
605 err = raw_enable_filters(sock_net(sk), dev, sk,
606 filter, count);
607 if (err) {
608 if (count > 1)
609 kfree(filter);
610 goto out_fil;
611 }
612
613 /* remove old filter registrations */
614 raw_disable_filters(sock_net(sk), dev, sk, ro->filter,
615 ro->count);
616 }
617
618 /* remove old filter space */
619 if (ro->count > 1)
620 kfree(ro->filter);
621
622 /* link new filters to the socket */
623 if (count == 1) {
624 /* copy filter data for single filter */
625 ro->dfilter = sfilter;
626 filter = &ro->dfilter;
627 }
628 ro->filter = filter;
629 ro->count = count;
630
631 out_fil:
632 release_sock(sk);
633 rtnl_unlock();
634
635 break;
636
637 case CAN_RAW_ERR_FILTER:
638 if (optlen != sizeof(err_mask))
639 return -EINVAL;
640
641 if (copy_from_sockptr(&err_mask, optval, optlen))
642 return -EFAULT;
643
644 err_mask &= CAN_ERR_MASK;
645
646 rtnl_lock();
647 lock_sock(sk);
648
649 dev = ro->dev;
650 if (ro->bound && dev) {
651 if (dev->reg_state != NETREG_REGISTERED) {
652 err = -ENODEV;
653 goto out_err;
654 }
655 }
656
657 /* remove current error mask */
658 if (ro->bound) {
659 /* (try to) register the new err_mask */
660 err = raw_enable_errfilter(sock_net(sk), dev, sk,
661 err_mask);
662
663 if (err)
664 goto out_err;
665
666 /* remove old err_mask registration */
667 raw_disable_errfilter(sock_net(sk), dev, sk,
668 ro->err_mask);
669 }
670
671 /* link new err_mask to the socket */
672 ro->err_mask = err_mask;
673
674 out_err:
675 release_sock(sk);
676 rtnl_unlock();
677
678 break;
679
680 case CAN_RAW_LOOPBACK:
681 if (optlen != sizeof(ro->loopback))
682 return -EINVAL;
683
684 if (copy_from_sockptr(&ro->loopback, optval, optlen))
685 return -EFAULT;
686
687 break;
688
689 case CAN_RAW_RECV_OWN_MSGS:
690 if (optlen != sizeof(ro->recv_own_msgs))
691 return -EINVAL;
692
693 if (copy_from_sockptr(&ro->recv_own_msgs, optval, optlen))
694 return -EFAULT;
695
696 break;
697
698 case CAN_RAW_FD_FRAMES:
699 if (optlen != sizeof(fd_frames))
700 return -EINVAL;
701
702 if (copy_from_sockptr(&fd_frames, optval, optlen))
703 return -EFAULT;
704
705 /* Enabling CAN XL includes CAN FD */
706 if (ro->xl_frames && !fd_frames)
707 return -EINVAL;
708
709 ro->fd_frames = fd_frames;
710 break;
711
712 case CAN_RAW_XL_FRAMES:
713 if (optlen != sizeof(ro->xl_frames))
714 return -EINVAL;
715
716 if (copy_from_sockptr(&ro->xl_frames, optval, optlen))
717 return -EFAULT;
718
719 /* Enabling CAN XL includes CAN FD */
720 if (ro->xl_frames)
721 ro->fd_frames = ro->xl_frames;
722 break;
723
724 case CAN_RAW_XL_VCID_OPTS:
725 if (optlen != sizeof(ro->raw_vcid_opts))
726 return -EINVAL;
727
728 if (copy_from_sockptr(&ro->raw_vcid_opts, optval, optlen))
729 return -EFAULT;
730
731 /* prepare 32 bit values for handling in hot path */
732 ro->tx_vcid_shifted = ro->raw_vcid_opts.tx_vcid << CANXL_VCID_OFFSET;
733 ro->rx_vcid_shifted = ro->raw_vcid_opts.rx_vcid << CANXL_VCID_OFFSET;
734 ro->rx_vcid_mask_shifted = ro->raw_vcid_opts.rx_vcid_mask << CANXL_VCID_OFFSET;
735 break;
736
737 case CAN_RAW_JOIN_FILTERS:
738 if (optlen != sizeof(ro->join_filters))
739 return -EINVAL;
740
741 if (copy_from_sockptr(&ro->join_filters, optval, optlen))
742 return -EFAULT;
743
744 break;
745
746 default:
747 return -ENOPROTOOPT;
748 }
749 return err;
750}
751
752static int raw_getsockopt(struct socket *sock, int level, int optname,
753 char __user *optval, int __user *optlen)
754{
755 struct sock *sk = sock->sk;
756 struct raw_sock *ro = raw_sk(sk);
757 int len;
758 void *val;
759
760 if (level != SOL_CAN_RAW)
761 return -EINVAL;
762 if (get_user(len, optlen))
763 return -EFAULT;
764 if (len < 0)
765 return -EINVAL;
766
767 switch (optname) {
768 case CAN_RAW_FILTER: {
769 int err = 0;
770
771 lock_sock(sk);
772 if (ro->count > 0) {
773 int fsize = ro->count * sizeof(struct can_filter);
774
775 /* user space buffer to small for filter list? */
776 if (len < fsize) {
777 /* return -ERANGE and needed space in optlen */
778 err = -ERANGE;
779 if (put_user(fsize, optlen))
780 err = -EFAULT;
781 } else {
782 if (len > fsize)
783 len = fsize;
784 if (copy_to_user(optval, ro->filter, len))
785 err = -EFAULT;
786 }
787 } else {
788 len = 0;
789 }
790 release_sock(sk);
791
792 if (!err)
793 err = put_user(len, optlen);
794 return err;
795 }
796 case CAN_RAW_ERR_FILTER:
797 if (len > sizeof(can_err_mask_t))
798 len = sizeof(can_err_mask_t);
799 val = &ro->err_mask;
800 break;
801
802 case CAN_RAW_LOOPBACK:
803 if (len > sizeof(int))
804 len = sizeof(int);
805 val = &ro->loopback;
806 break;
807
808 case CAN_RAW_RECV_OWN_MSGS:
809 if (len > sizeof(int))
810 len = sizeof(int);
811 val = &ro->recv_own_msgs;
812 break;
813
814 case CAN_RAW_FD_FRAMES:
815 if (len > sizeof(int))
816 len = sizeof(int);
817 val = &ro->fd_frames;
818 break;
819
820 case CAN_RAW_XL_FRAMES:
821 if (len > sizeof(int))
822 len = sizeof(int);
823 val = &ro->xl_frames;
824 break;
825
826 case CAN_RAW_XL_VCID_OPTS: {
827 int err = 0;
828
829 /* user space buffer to small for VCID opts? */
830 if (len < sizeof(ro->raw_vcid_opts)) {
831 /* return -ERANGE and needed space in optlen */
832 err = -ERANGE;
833 if (put_user(sizeof(ro->raw_vcid_opts), optlen))
834 err = -EFAULT;
835 } else {
836 if (len > sizeof(ro->raw_vcid_opts))
837 len = sizeof(ro->raw_vcid_opts);
838 if (copy_to_user(optval, &ro->raw_vcid_opts, len))
839 err = -EFAULT;
840 }
841 if (!err)
842 err = put_user(len, optlen);
843 return err;
844 }
845 case CAN_RAW_JOIN_FILTERS:
846 if (len > sizeof(int))
847 len = sizeof(int);
848 val = &ro->join_filters;
849 break;
850
851 default:
852 return -ENOPROTOOPT;
853 }
854
855 if (put_user(len, optlen))
856 return -EFAULT;
857 if (copy_to_user(optval, val, len))
858 return -EFAULT;
859 return 0;
860}
861
862static void raw_put_canxl_vcid(struct raw_sock *ro, struct sk_buff *skb)
863{
864 struct canxl_frame *cxl = (struct canxl_frame *)skb->data;
865
866 /* sanitize non CAN XL bits */
867 cxl->prio &= (CANXL_PRIO_MASK | CANXL_VCID_MASK);
868
869 /* clear VCID in CAN XL frame if pass through is disabled */
870 if (!(ro->raw_vcid_opts.flags & CAN_RAW_XL_VCID_TX_PASS))
871 cxl->prio &= CANXL_PRIO_MASK;
872
873 /* set VCID in CAN XL frame if enabled */
874 if (ro->raw_vcid_opts.flags & CAN_RAW_XL_VCID_TX_SET) {
875 cxl->prio &= CANXL_PRIO_MASK;
876 cxl->prio |= ro->tx_vcid_shifted;
877 }
878}
879
880static unsigned int raw_check_txframe(struct raw_sock *ro, struct sk_buff *skb, int mtu)
881{
882 /* Classical CAN -> no checks for flags and device capabilities */
883 if (can_is_can_skb(skb))
884 return CAN_MTU;
885
886 /* CAN FD -> needs to be enabled and a CAN FD or CAN XL device */
887 if (ro->fd_frames && can_is_canfd_skb(skb) &&
888 (mtu == CANFD_MTU || can_is_canxl_dev_mtu(mtu)))
889 return CANFD_MTU;
890
891 /* CAN XL -> needs to be enabled and a CAN XL device */
892 if (ro->xl_frames && can_is_canxl_skb(skb) &&
893 can_is_canxl_dev_mtu(mtu))
894 return CANXL_MTU;
895
896 return 0;
897}
898
899static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
900{
901 struct sock *sk = sock->sk;
902 struct raw_sock *ro = raw_sk(sk);
903 struct sockcm_cookie sockc;
904 struct sk_buff *skb;
905 struct net_device *dev;
906 unsigned int txmtu;
907 int ifindex;
908 int err = -EINVAL;
909
910 /* check for valid CAN frame sizes */
911 if (size < CANXL_HDR_SIZE + CANXL_MIN_DLEN || size > CANXL_MTU)
912 return -EINVAL;
913
914 if (msg->msg_name) {
915 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
916
917 if (msg->msg_namelen < RAW_MIN_NAMELEN)
918 return -EINVAL;
919
920 if (addr->can_family != AF_CAN)
921 return -EINVAL;
922
923 ifindex = addr->can_ifindex;
924 } else {
925 ifindex = ro->ifindex;
926 }
927
928 dev = dev_get_by_index(sock_net(sk), ifindex);
929 if (!dev)
930 return -ENXIO;
931
932 skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
933 msg->msg_flags & MSG_DONTWAIT, &err);
934 if (!skb)
935 goto put_dev;
936
937 can_skb_reserve(skb);
938 can_skb_prv(skb)->ifindex = dev->ifindex;
939 can_skb_prv(skb)->skbcnt = 0;
940
941 /* fill the skb before testing for valid CAN frames */
942 err = memcpy_from_msg(skb_put(skb, size), msg, size);
943 if (err < 0)
944 goto free_skb;
945
946 err = -EINVAL;
947
948 /* check for valid CAN (CC/FD/XL) frame content */
949 txmtu = raw_check_txframe(ro, skb, dev->mtu);
950 if (!txmtu)
951 goto free_skb;
952
953 /* only CANXL: clear/forward/set VCID value */
954 if (txmtu == CANXL_MTU)
955 raw_put_canxl_vcid(ro, skb);
956
957 sockcm_init(&sockc, sk);
958 if (msg->msg_controllen) {
959 err = sock_cmsg_send(sk, msg, &sockc);
960 if (unlikely(err))
961 goto free_skb;
962 }
963
964 skb->dev = dev;
965 skb->priority = READ_ONCE(sk->sk_priority);
966 skb->mark = READ_ONCE(sk->sk_mark);
967 skb->tstamp = sockc.transmit_time;
968
969 skb_setup_tx_timestamp(skb, &sockc);
970
971 err = can_send(skb, ro->loopback);
972
973 dev_put(dev);
974
975 if (err)
976 goto send_failed;
977
978 return size;
979
980free_skb:
981 kfree_skb(skb);
982put_dev:
983 dev_put(dev);
984send_failed:
985 return err;
986}
987
988static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
989 int flags)
990{
991 struct sock *sk = sock->sk;
992 struct sk_buff *skb;
993 int err = 0;
994
995 if (flags & MSG_ERRQUEUE)
996 return sock_recv_errqueue(sk, msg, size,
997 SOL_CAN_RAW, SCM_CAN_RAW_ERRQUEUE);
998
999 skb = skb_recv_datagram(sk, flags, &err);
1000 if (!skb)
1001 return err;
1002
1003 if (size < skb->len)
1004 msg->msg_flags |= MSG_TRUNC;
1005 else
1006 size = skb->len;
1007
1008 err = memcpy_to_msg(msg, skb->data, size);
1009 if (err < 0) {
1010 skb_free_datagram(sk, skb);
1011 return err;
1012 }
1013
1014 sock_recv_cmsgs(msg, sk, skb);
1015
1016 if (msg->msg_name) {
1017 __sockaddr_check_size(RAW_MIN_NAMELEN);
1018 msg->msg_namelen = RAW_MIN_NAMELEN;
1019 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1020 }
1021
1022 /* assign the flags that have been recorded in raw_rcv() */
1023 msg->msg_flags |= *(raw_flags(skb));
1024
1025 skb_free_datagram(sk, skb);
1026
1027 return size;
1028}
1029
1030static int raw_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
1031 unsigned long arg)
1032{
1033 /* no ioctls for socket layer -> hand it down to NIC layer */
1034 return -ENOIOCTLCMD;
1035}
1036
1037static const struct proto_ops raw_ops = {
1038 .family = PF_CAN,
1039 .release = raw_release,
1040 .bind = raw_bind,
1041 .connect = sock_no_connect,
1042 .socketpair = sock_no_socketpair,
1043 .accept = sock_no_accept,
1044 .getname = raw_getname,
1045 .poll = datagram_poll,
1046 .ioctl = raw_sock_no_ioctlcmd,
1047 .gettstamp = sock_gettstamp,
1048 .listen = sock_no_listen,
1049 .shutdown = sock_no_shutdown,
1050 .setsockopt = raw_setsockopt,
1051 .getsockopt = raw_getsockopt,
1052 .sendmsg = raw_sendmsg,
1053 .recvmsg = raw_recvmsg,
1054 .mmap = sock_no_mmap,
1055};
1056
1057static struct proto raw_proto __read_mostly = {
1058 .name = "CAN_RAW",
1059 .owner = THIS_MODULE,
1060 .obj_size = sizeof(struct raw_sock),
1061 .init = raw_init,
1062};
1063
1064static const struct can_proto raw_can_proto = {
1065 .type = SOCK_RAW,
1066 .protocol = CAN_RAW,
1067 .ops = &raw_ops,
1068 .prot = &raw_proto,
1069};
1070
1071static struct notifier_block canraw_notifier = {
1072 .notifier_call = raw_notifier
1073};
1074
1075static __init int raw_module_init(void)
1076{
1077 int err;
1078
1079 pr_info("can: raw protocol\n");
1080
1081 err = register_netdevice_notifier(&canraw_notifier);
1082 if (err)
1083 return err;
1084
1085 err = can_proto_register(&raw_can_proto);
1086 if (err < 0) {
1087 pr_err("can: registration of raw protocol failed\n");
1088 goto register_proto_failed;
1089 }
1090
1091 return 0;
1092
1093register_proto_failed:
1094 unregister_netdevice_notifier(&canraw_notifier);
1095 return err;
1096}
1097
1098static __exit void raw_module_exit(void)
1099{
1100 can_proto_unregister(&raw_can_proto);
1101 unregister_netdevice_notifier(&canraw_notifier);
1102}
1103
1104module_init(raw_module_init);
1105module_exit(raw_module_exit);
1/*
2 * raw.c - Raw sockets for protocol family CAN
3 *
4 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of Volkswagen nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above.
23 *
24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules with a GPL compatible license.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
38 * DAMAGE.
39 *
40 */
41
42#include <linux/module.h>
43#include <linux/init.h>
44#include <linux/uio.h>
45#include <linux/net.h>
46#include <linux/slab.h>
47#include <linux/netdevice.h>
48#include <linux/socket.h>
49#include <linux/if_arp.h>
50#include <linux/skbuff.h>
51#include <linux/can.h>
52#include <linux/can/core.h>
53#include <linux/can/raw.h>
54#include <net/sock.h>
55#include <net/net_namespace.h>
56
57#define CAN_RAW_VERSION CAN_VERSION
58static __initdata const char banner[] =
59 KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
60
61MODULE_DESCRIPTION("PF_CAN raw protocol");
62MODULE_LICENSE("Dual BSD/GPL");
63MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
64MODULE_ALIAS("can-proto-1");
65
66#define MASK_ALL 0
67
68/*
69 * A raw socket has a list of can_filters attached to it, each receiving
70 * the CAN frames matching that filter. If the filter list is empty,
71 * no CAN frames will be received by the socket. The default after
72 * opening the socket, is to have one filter which receives all frames.
73 * The filter list is allocated dynamically with the exception of the
74 * list containing only one item. This common case is optimized by
75 * storing the single filter in dfilter, to avoid using dynamic memory.
76 */
77
78struct raw_sock {
79 struct sock sk;
80 int bound;
81 int ifindex;
82 struct notifier_block notifier;
83 int loopback;
84 int recv_own_msgs;
85 int count; /* number of active filters */
86 struct can_filter dfilter; /* default/single filter */
87 struct can_filter *filter; /* pointer to filter(s) */
88 can_err_mask_t err_mask;
89};
90
91/*
92 * Return pointer to store the extra msg flags for raw_recvmsg().
93 * We use the space of one unsigned int beyond the 'struct sockaddr_can'
94 * in skb->cb.
95 */
96static inline unsigned int *raw_flags(struct sk_buff *skb)
97{
98 BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) +
99 sizeof(unsigned int)));
100
101 /* return pointer after struct sockaddr_can */
102 return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
103}
104
105static inline struct raw_sock *raw_sk(const struct sock *sk)
106{
107 return (struct raw_sock *)sk;
108}
109
110static void raw_rcv(struct sk_buff *oskb, void *data)
111{
112 struct sock *sk = (struct sock *)data;
113 struct raw_sock *ro = raw_sk(sk);
114 struct sockaddr_can *addr;
115 struct sk_buff *skb;
116 unsigned int *pflags;
117
118 /* check the received tx sock reference */
119 if (!ro->recv_own_msgs && oskb->sk == sk)
120 return;
121
122 /* clone the given skb to be able to enqueue it into the rcv queue */
123 skb = skb_clone(oskb, GFP_ATOMIC);
124 if (!skb)
125 return;
126
127 /*
128 * Put the datagram to the queue so that raw_recvmsg() can
129 * get it from there. We need to pass the interface index to
130 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
131 * containing the interface index.
132 */
133
134 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
135 addr = (struct sockaddr_can *)skb->cb;
136 memset(addr, 0, sizeof(*addr));
137 addr->can_family = AF_CAN;
138 addr->can_ifindex = skb->dev->ifindex;
139
140 /* add CAN specific message flags for raw_recvmsg() */
141 pflags = raw_flags(skb);
142 *pflags = 0;
143 if (oskb->sk)
144 *pflags |= MSG_DONTROUTE;
145 if (oskb->sk == sk)
146 *pflags |= MSG_CONFIRM;
147
148 if (sock_queue_rcv_skb(sk, skb) < 0)
149 kfree_skb(skb);
150}
151
152static int raw_enable_filters(struct net_device *dev, struct sock *sk,
153 struct can_filter *filter, int count)
154{
155 int err = 0;
156 int i;
157
158 for (i = 0; i < count; i++) {
159 err = can_rx_register(dev, filter[i].can_id,
160 filter[i].can_mask,
161 raw_rcv, sk, "raw");
162 if (err) {
163 /* clean up successfully registered filters */
164 while (--i >= 0)
165 can_rx_unregister(dev, filter[i].can_id,
166 filter[i].can_mask,
167 raw_rcv, sk);
168 break;
169 }
170 }
171
172 return err;
173}
174
175static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
176 can_err_mask_t err_mask)
177{
178 int err = 0;
179
180 if (err_mask)
181 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
182 raw_rcv, sk, "raw");
183
184 return err;
185}
186
187static void raw_disable_filters(struct net_device *dev, struct sock *sk,
188 struct can_filter *filter, int count)
189{
190 int i;
191
192 for (i = 0; i < count; i++)
193 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
194 raw_rcv, sk);
195}
196
197static inline void raw_disable_errfilter(struct net_device *dev,
198 struct sock *sk,
199 can_err_mask_t err_mask)
200
201{
202 if (err_mask)
203 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
204 raw_rcv, sk);
205}
206
207static inline void raw_disable_allfilters(struct net_device *dev,
208 struct sock *sk)
209{
210 struct raw_sock *ro = raw_sk(sk);
211
212 raw_disable_filters(dev, sk, ro->filter, ro->count);
213 raw_disable_errfilter(dev, sk, ro->err_mask);
214}
215
216static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
217{
218 struct raw_sock *ro = raw_sk(sk);
219 int err;
220
221 err = raw_enable_filters(dev, sk, ro->filter, ro->count);
222 if (!err) {
223 err = raw_enable_errfilter(dev, sk, ro->err_mask);
224 if (err)
225 raw_disable_filters(dev, sk, ro->filter, ro->count);
226 }
227
228 return err;
229}
230
231static int raw_notifier(struct notifier_block *nb,
232 unsigned long msg, void *data)
233{
234 struct net_device *dev = (struct net_device *)data;
235 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
236 struct sock *sk = &ro->sk;
237
238 if (!net_eq(dev_net(dev), &init_net))
239 return NOTIFY_DONE;
240
241 if (dev->type != ARPHRD_CAN)
242 return NOTIFY_DONE;
243
244 if (ro->ifindex != dev->ifindex)
245 return NOTIFY_DONE;
246
247 switch (msg) {
248
249 case NETDEV_UNREGISTER:
250 lock_sock(sk);
251 /* remove current filters & unregister */
252 if (ro->bound)
253 raw_disable_allfilters(dev, sk);
254
255 if (ro->count > 1)
256 kfree(ro->filter);
257
258 ro->ifindex = 0;
259 ro->bound = 0;
260 ro->count = 0;
261 release_sock(sk);
262
263 sk->sk_err = ENODEV;
264 if (!sock_flag(sk, SOCK_DEAD))
265 sk->sk_error_report(sk);
266 break;
267
268 case NETDEV_DOWN:
269 sk->sk_err = ENETDOWN;
270 if (!sock_flag(sk, SOCK_DEAD))
271 sk->sk_error_report(sk);
272 break;
273 }
274
275 return NOTIFY_DONE;
276}
277
278static int raw_init(struct sock *sk)
279{
280 struct raw_sock *ro = raw_sk(sk);
281
282 ro->bound = 0;
283 ro->ifindex = 0;
284
285 /* set default filter to single entry dfilter */
286 ro->dfilter.can_id = 0;
287 ro->dfilter.can_mask = MASK_ALL;
288 ro->filter = &ro->dfilter;
289 ro->count = 1;
290
291 /* set default loopback behaviour */
292 ro->loopback = 1;
293 ro->recv_own_msgs = 0;
294
295 /* set notifier */
296 ro->notifier.notifier_call = raw_notifier;
297
298 register_netdevice_notifier(&ro->notifier);
299
300 return 0;
301}
302
303static int raw_release(struct socket *sock)
304{
305 struct sock *sk = sock->sk;
306 struct raw_sock *ro;
307
308 if (!sk)
309 return 0;
310
311 ro = raw_sk(sk);
312
313 unregister_netdevice_notifier(&ro->notifier);
314
315 lock_sock(sk);
316
317 /* remove current filters & unregister */
318 if (ro->bound) {
319 if (ro->ifindex) {
320 struct net_device *dev;
321
322 dev = dev_get_by_index(&init_net, ro->ifindex);
323 if (dev) {
324 raw_disable_allfilters(dev, sk);
325 dev_put(dev);
326 }
327 } else
328 raw_disable_allfilters(NULL, sk);
329 }
330
331 if (ro->count > 1)
332 kfree(ro->filter);
333
334 ro->ifindex = 0;
335 ro->bound = 0;
336 ro->count = 0;
337
338 sock_orphan(sk);
339 sock->sk = NULL;
340
341 release_sock(sk);
342 sock_put(sk);
343
344 return 0;
345}
346
347static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
348{
349 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
350 struct sock *sk = sock->sk;
351 struct raw_sock *ro = raw_sk(sk);
352 int ifindex;
353 int err = 0;
354 int notify_enetdown = 0;
355
356 if (len < sizeof(*addr))
357 return -EINVAL;
358
359 lock_sock(sk);
360
361 if (ro->bound && addr->can_ifindex == ro->ifindex)
362 goto out;
363
364 if (addr->can_ifindex) {
365 struct net_device *dev;
366
367 dev = dev_get_by_index(&init_net, addr->can_ifindex);
368 if (!dev) {
369 err = -ENODEV;
370 goto out;
371 }
372 if (dev->type != ARPHRD_CAN) {
373 dev_put(dev);
374 err = -ENODEV;
375 goto out;
376 }
377 if (!(dev->flags & IFF_UP))
378 notify_enetdown = 1;
379
380 ifindex = dev->ifindex;
381
382 /* filters set by default/setsockopt */
383 err = raw_enable_allfilters(dev, sk);
384 dev_put(dev);
385 } else {
386 ifindex = 0;
387
388 /* filters set by default/setsockopt */
389 err = raw_enable_allfilters(NULL, sk);
390 }
391
392 if (!err) {
393 if (ro->bound) {
394 /* unregister old filters */
395 if (ro->ifindex) {
396 struct net_device *dev;
397
398 dev = dev_get_by_index(&init_net, ro->ifindex);
399 if (dev) {
400 raw_disable_allfilters(dev, sk);
401 dev_put(dev);
402 }
403 } else
404 raw_disable_allfilters(NULL, sk);
405 }
406 ro->ifindex = ifindex;
407 ro->bound = 1;
408 }
409
410 out:
411 release_sock(sk);
412
413 if (notify_enetdown) {
414 sk->sk_err = ENETDOWN;
415 if (!sock_flag(sk, SOCK_DEAD))
416 sk->sk_error_report(sk);
417 }
418
419 return err;
420}
421
422static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
423 int *len, int peer)
424{
425 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
426 struct sock *sk = sock->sk;
427 struct raw_sock *ro = raw_sk(sk);
428
429 if (peer)
430 return -EOPNOTSUPP;
431
432 memset(addr, 0, sizeof(*addr));
433 addr->can_family = AF_CAN;
434 addr->can_ifindex = ro->ifindex;
435
436 *len = sizeof(*addr);
437
438 return 0;
439}
440
441static int raw_setsockopt(struct socket *sock, int level, int optname,
442 char __user *optval, unsigned int optlen)
443{
444 struct sock *sk = sock->sk;
445 struct raw_sock *ro = raw_sk(sk);
446 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
447 struct can_filter sfilter; /* single filter */
448 struct net_device *dev = NULL;
449 can_err_mask_t err_mask = 0;
450 int count = 0;
451 int err = 0;
452
453 if (level != SOL_CAN_RAW)
454 return -EINVAL;
455
456 switch (optname) {
457
458 case CAN_RAW_FILTER:
459 if (optlen % sizeof(struct can_filter) != 0)
460 return -EINVAL;
461
462 count = optlen / sizeof(struct can_filter);
463
464 if (count > 1) {
465 /* filter does not fit into dfilter => alloc space */
466 filter = memdup_user(optval, optlen);
467 if (IS_ERR(filter))
468 return PTR_ERR(filter);
469 } else if (count == 1) {
470 if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
471 return -EFAULT;
472 }
473
474 lock_sock(sk);
475
476 if (ro->bound && ro->ifindex)
477 dev = dev_get_by_index(&init_net, ro->ifindex);
478
479 if (ro->bound) {
480 /* (try to) register the new filters */
481 if (count == 1)
482 err = raw_enable_filters(dev, sk, &sfilter, 1);
483 else
484 err = raw_enable_filters(dev, sk, filter,
485 count);
486 if (err) {
487 if (count > 1)
488 kfree(filter);
489 goto out_fil;
490 }
491
492 /* remove old filter registrations */
493 raw_disable_filters(dev, sk, ro->filter, ro->count);
494 }
495
496 /* remove old filter space */
497 if (ro->count > 1)
498 kfree(ro->filter);
499
500 /* link new filters to the socket */
501 if (count == 1) {
502 /* copy filter data for single filter */
503 ro->dfilter = sfilter;
504 filter = &ro->dfilter;
505 }
506 ro->filter = filter;
507 ro->count = count;
508
509 out_fil:
510 if (dev)
511 dev_put(dev);
512
513 release_sock(sk);
514
515 break;
516
517 case CAN_RAW_ERR_FILTER:
518 if (optlen != sizeof(err_mask))
519 return -EINVAL;
520
521 if (copy_from_user(&err_mask, optval, optlen))
522 return -EFAULT;
523
524 err_mask &= CAN_ERR_MASK;
525
526 lock_sock(sk);
527
528 if (ro->bound && ro->ifindex)
529 dev = dev_get_by_index(&init_net, ro->ifindex);
530
531 /* remove current error mask */
532 if (ro->bound) {
533 /* (try to) register the new err_mask */
534 err = raw_enable_errfilter(dev, sk, err_mask);
535
536 if (err)
537 goto out_err;
538
539 /* remove old err_mask registration */
540 raw_disable_errfilter(dev, sk, ro->err_mask);
541 }
542
543 /* link new err_mask to the socket */
544 ro->err_mask = err_mask;
545
546 out_err:
547 if (dev)
548 dev_put(dev);
549
550 release_sock(sk);
551
552 break;
553
554 case CAN_RAW_LOOPBACK:
555 if (optlen != sizeof(ro->loopback))
556 return -EINVAL;
557
558 if (copy_from_user(&ro->loopback, optval, optlen))
559 return -EFAULT;
560
561 break;
562
563 case CAN_RAW_RECV_OWN_MSGS:
564 if (optlen != sizeof(ro->recv_own_msgs))
565 return -EINVAL;
566
567 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
568 return -EFAULT;
569
570 break;
571
572 default:
573 return -ENOPROTOOPT;
574 }
575 return err;
576}
577
578static int raw_getsockopt(struct socket *sock, int level, int optname,
579 char __user *optval, int __user *optlen)
580{
581 struct sock *sk = sock->sk;
582 struct raw_sock *ro = raw_sk(sk);
583 int len;
584 void *val;
585 int err = 0;
586
587 if (level != SOL_CAN_RAW)
588 return -EINVAL;
589 if (get_user(len, optlen))
590 return -EFAULT;
591 if (len < 0)
592 return -EINVAL;
593
594 switch (optname) {
595
596 case CAN_RAW_FILTER:
597 lock_sock(sk);
598 if (ro->count > 0) {
599 int fsize = ro->count * sizeof(struct can_filter);
600 if (len > fsize)
601 len = fsize;
602 if (copy_to_user(optval, ro->filter, len))
603 err = -EFAULT;
604 } else
605 len = 0;
606 release_sock(sk);
607
608 if (!err)
609 err = put_user(len, optlen);
610 return err;
611
612 case CAN_RAW_ERR_FILTER:
613 if (len > sizeof(can_err_mask_t))
614 len = sizeof(can_err_mask_t);
615 val = &ro->err_mask;
616 break;
617
618 case CAN_RAW_LOOPBACK:
619 if (len > sizeof(int))
620 len = sizeof(int);
621 val = &ro->loopback;
622 break;
623
624 case CAN_RAW_RECV_OWN_MSGS:
625 if (len > sizeof(int))
626 len = sizeof(int);
627 val = &ro->recv_own_msgs;
628 break;
629
630 default:
631 return -ENOPROTOOPT;
632 }
633
634 if (put_user(len, optlen))
635 return -EFAULT;
636 if (copy_to_user(optval, val, len))
637 return -EFAULT;
638 return 0;
639}
640
641static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
642 struct msghdr *msg, size_t size)
643{
644 struct sock *sk = sock->sk;
645 struct raw_sock *ro = raw_sk(sk);
646 struct sk_buff *skb;
647 struct net_device *dev;
648 int ifindex;
649 int err;
650
651 if (msg->msg_name) {
652 struct sockaddr_can *addr =
653 (struct sockaddr_can *)msg->msg_name;
654
655 if (msg->msg_namelen < sizeof(*addr))
656 return -EINVAL;
657
658 if (addr->can_family != AF_CAN)
659 return -EINVAL;
660
661 ifindex = addr->can_ifindex;
662 } else
663 ifindex = ro->ifindex;
664
665 if (size != sizeof(struct can_frame))
666 return -EINVAL;
667
668 dev = dev_get_by_index(&init_net, ifindex);
669 if (!dev)
670 return -ENXIO;
671
672 skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
673 &err);
674 if (!skb)
675 goto put_dev;
676
677 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
678 if (err < 0)
679 goto free_skb;
680 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
681 if (err < 0)
682 goto free_skb;
683
684 skb->dev = dev;
685 skb->sk = sk;
686
687 err = can_send(skb, ro->loopback);
688
689 dev_put(dev);
690
691 if (err)
692 goto send_failed;
693
694 return size;
695
696free_skb:
697 kfree_skb(skb);
698put_dev:
699 dev_put(dev);
700send_failed:
701 return err;
702}
703
704static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
705 struct msghdr *msg, size_t size, int flags)
706{
707 struct sock *sk = sock->sk;
708 struct sk_buff *skb;
709 int err = 0;
710 int noblock;
711
712 noblock = flags & MSG_DONTWAIT;
713 flags &= ~MSG_DONTWAIT;
714
715 skb = skb_recv_datagram(sk, flags, noblock, &err);
716 if (!skb)
717 return err;
718
719 if (size < skb->len)
720 msg->msg_flags |= MSG_TRUNC;
721 else
722 size = skb->len;
723
724 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
725 if (err < 0) {
726 skb_free_datagram(sk, skb);
727 return err;
728 }
729
730 sock_recv_ts_and_drops(msg, sk, skb);
731
732 if (msg->msg_name) {
733 msg->msg_namelen = sizeof(struct sockaddr_can);
734 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
735 }
736
737 /* assign the flags that have been recorded in raw_rcv() */
738 msg->msg_flags |= *(raw_flags(skb));
739
740 skb_free_datagram(sk, skb);
741
742 return size;
743}
744
745static const struct proto_ops raw_ops = {
746 .family = PF_CAN,
747 .release = raw_release,
748 .bind = raw_bind,
749 .connect = sock_no_connect,
750 .socketpair = sock_no_socketpair,
751 .accept = sock_no_accept,
752 .getname = raw_getname,
753 .poll = datagram_poll,
754 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
755 .listen = sock_no_listen,
756 .shutdown = sock_no_shutdown,
757 .setsockopt = raw_setsockopt,
758 .getsockopt = raw_getsockopt,
759 .sendmsg = raw_sendmsg,
760 .recvmsg = raw_recvmsg,
761 .mmap = sock_no_mmap,
762 .sendpage = sock_no_sendpage,
763};
764
765static struct proto raw_proto __read_mostly = {
766 .name = "CAN_RAW",
767 .owner = THIS_MODULE,
768 .obj_size = sizeof(struct raw_sock),
769 .init = raw_init,
770};
771
772static const struct can_proto raw_can_proto = {
773 .type = SOCK_RAW,
774 .protocol = CAN_RAW,
775 .ops = &raw_ops,
776 .prot = &raw_proto,
777};
778
779static __init int raw_module_init(void)
780{
781 int err;
782
783 printk(banner);
784
785 err = can_proto_register(&raw_can_proto);
786 if (err < 0)
787 printk(KERN_ERR "can: registration of raw protocol failed\n");
788
789 return err;
790}
791
792static __exit void raw_module_exit(void)
793{
794 can_proto_unregister(&raw_can_proto);
795}
796
797module_init(raw_module_init);
798module_exit(raw_module_exit);