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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/skb.h>
54#include <linux/can/raw.h>
55#include <net/sock.h>
56#include <net/net_namespace.h>
57
58MODULE_DESCRIPTION("PF_CAN raw protocol");
59MODULE_LICENSE("Dual BSD/GPL");
60MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
61MODULE_ALIAS("can-proto-1");
62
63#define RAW_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_ifindex)
64
65#define MASK_ALL 0
66
67/* A raw socket has a list of can_filters attached to it, each receiving
68 * the CAN frames matching that filter. If the filter list is empty,
69 * no CAN frames will be received by the socket. The default after
70 * opening the socket, is to have one filter which receives all frames.
71 * The filter list is allocated dynamically with the exception of the
72 * list containing only one item. This common case is optimized by
73 * storing the single filter in dfilter, to avoid using dynamic memory.
74 */
75
76struct uniqframe {
77 int skbcnt;
78 const struct sk_buff *skb;
79 unsigned int join_rx_count;
80};
81
82struct raw_sock {
83 struct sock sk;
84 int bound;
85 int ifindex;
86 struct list_head notifier;
87 int loopback;
88 int recv_own_msgs;
89 int fd_frames;
90 int join_filters;
91 int count; /* number of active filters */
92 struct can_filter dfilter; /* default/single filter */
93 struct can_filter *filter; /* pointer to filter(s) */
94 can_err_mask_t err_mask;
95 struct uniqframe __percpu *uniq;
96};
97
98static LIST_HEAD(raw_notifier_list);
99static DEFINE_SPINLOCK(raw_notifier_lock);
100static struct raw_sock *raw_busy_notifier;
101
102/* Return pointer to store the extra msg flags for raw_recvmsg().
103 * We use the space of one unsigned int beyond the 'struct sockaddr_can'
104 * in skb->cb.
105 */
106static inline unsigned int *raw_flags(struct sk_buff *skb)
107{
108 sock_skb_cb_check_size(sizeof(struct sockaddr_can) +
109 sizeof(unsigned int));
110
111 /* return pointer after struct sockaddr_can */
112 return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
113}
114
115static inline struct raw_sock *raw_sk(const struct sock *sk)
116{
117 return (struct raw_sock *)sk;
118}
119
120static void raw_rcv(struct sk_buff *oskb, void *data)
121{
122 struct sock *sk = (struct sock *)data;
123 struct raw_sock *ro = raw_sk(sk);
124 struct sockaddr_can *addr;
125 struct sk_buff *skb;
126 unsigned int *pflags;
127
128 /* check the received tx sock reference */
129 if (!ro->recv_own_msgs && oskb->sk == sk)
130 return;
131
132 /* do not pass non-CAN2.0 frames to a legacy socket */
133 if (!ro->fd_frames && oskb->len != CAN_MTU)
134 return;
135
136 /* eliminate multiple filter matches for the same skb */
137 if (this_cpu_ptr(ro->uniq)->skb == oskb &&
138 this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
139 if (ro->join_filters) {
140 this_cpu_inc(ro->uniq->join_rx_count);
141 /* drop frame until all enabled filters matched */
142 if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count)
143 return;
144 } else {
145 return;
146 }
147 } else {
148 this_cpu_ptr(ro->uniq)->skb = oskb;
149 this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
150 this_cpu_ptr(ro->uniq)->join_rx_count = 1;
151 /* drop first frame to check all enabled filters? */
152 if (ro->join_filters && ro->count > 1)
153 return;
154 }
155
156 /* clone the given skb to be able to enqueue it into the rcv queue */
157 skb = skb_clone(oskb, GFP_ATOMIC);
158 if (!skb)
159 return;
160
161 /* Put the datagram to the queue so that raw_recvmsg() can get
162 * it from there. We need to pass the interface index to
163 * raw_recvmsg(). We pass a whole struct sockaddr_can in
164 * skb->cb containing the interface index.
165 */
166
167 sock_skb_cb_check_size(sizeof(struct sockaddr_can));
168 addr = (struct sockaddr_can *)skb->cb;
169 memset(addr, 0, sizeof(*addr));
170 addr->can_family = AF_CAN;
171 addr->can_ifindex = skb->dev->ifindex;
172
173 /* add CAN specific message flags for raw_recvmsg() */
174 pflags = raw_flags(skb);
175 *pflags = 0;
176 if (oskb->sk)
177 *pflags |= MSG_DONTROUTE;
178 if (oskb->sk == sk)
179 *pflags |= MSG_CONFIRM;
180
181 if (sock_queue_rcv_skb(sk, skb) < 0)
182 kfree_skb(skb);
183}
184
185static int raw_enable_filters(struct net *net, struct net_device *dev,
186 struct sock *sk, struct can_filter *filter,
187 int count)
188{
189 int err = 0;
190 int i;
191
192 for (i = 0; i < count; i++) {
193 err = can_rx_register(net, dev, filter[i].can_id,
194 filter[i].can_mask,
195 raw_rcv, sk, "raw", sk);
196 if (err) {
197 /* clean up successfully registered filters */
198 while (--i >= 0)
199 can_rx_unregister(net, dev, filter[i].can_id,
200 filter[i].can_mask,
201 raw_rcv, sk);
202 break;
203 }
204 }
205
206 return err;
207}
208
209static int raw_enable_errfilter(struct net *net, struct net_device *dev,
210 struct sock *sk, can_err_mask_t err_mask)
211{
212 int err = 0;
213
214 if (err_mask)
215 err = can_rx_register(net, dev, 0, err_mask | CAN_ERR_FLAG,
216 raw_rcv, sk, "raw", sk);
217
218 return err;
219}
220
221static void raw_disable_filters(struct net *net, struct net_device *dev,
222 struct sock *sk, struct can_filter *filter,
223 int count)
224{
225 int i;
226
227 for (i = 0; i < count; i++)
228 can_rx_unregister(net, dev, filter[i].can_id,
229 filter[i].can_mask, raw_rcv, sk);
230}
231
232static inline void raw_disable_errfilter(struct net *net,
233 struct net_device *dev,
234 struct sock *sk,
235 can_err_mask_t err_mask)
236
237{
238 if (err_mask)
239 can_rx_unregister(net, dev, 0, err_mask | CAN_ERR_FLAG,
240 raw_rcv, sk);
241}
242
243static inline void raw_disable_allfilters(struct net *net,
244 struct net_device *dev,
245 struct sock *sk)
246{
247 struct raw_sock *ro = raw_sk(sk);
248
249 raw_disable_filters(net, dev, sk, ro->filter, ro->count);
250 raw_disable_errfilter(net, dev, sk, ro->err_mask);
251}
252
253static int raw_enable_allfilters(struct net *net, struct net_device *dev,
254 struct sock *sk)
255{
256 struct raw_sock *ro = raw_sk(sk);
257 int err;
258
259 err = raw_enable_filters(net, dev, sk, ro->filter, ro->count);
260 if (!err) {
261 err = raw_enable_errfilter(net, dev, sk, ro->err_mask);
262 if (err)
263 raw_disable_filters(net, dev, sk, ro->filter,
264 ro->count);
265 }
266
267 return err;
268}
269
270static void raw_notify(struct raw_sock *ro, unsigned long msg,
271 struct net_device *dev)
272{
273 struct sock *sk = &ro->sk;
274
275 if (!net_eq(dev_net(dev), sock_net(sk)))
276 return;
277
278 if (ro->ifindex != dev->ifindex)
279 return;
280
281 switch (msg) {
282 case NETDEV_UNREGISTER:
283 lock_sock(sk);
284 /* remove current filters & unregister */
285 if (ro->bound)
286 raw_disable_allfilters(dev_net(dev), dev, sk);
287
288 if (ro->count > 1)
289 kfree(ro->filter);
290
291 ro->ifindex = 0;
292 ro->bound = 0;
293 ro->count = 0;
294 release_sock(sk);
295
296 sk->sk_err = ENODEV;
297 if (!sock_flag(sk, SOCK_DEAD))
298 sk_error_report(sk);
299 break;
300
301 case NETDEV_DOWN:
302 sk->sk_err = ENETDOWN;
303 if (!sock_flag(sk, SOCK_DEAD))
304 sk_error_report(sk);
305 break;
306 }
307}
308
309static int raw_notifier(struct notifier_block *nb, unsigned long msg,
310 void *ptr)
311{
312 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
313
314 if (dev->type != ARPHRD_CAN)
315 return NOTIFY_DONE;
316 if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
317 return NOTIFY_DONE;
318 if (unlikely(raw_busy_notifier)) /* Check for reentrant bug. */
319 return NOTIFY_DONE;
320
321 spin_lock(&raw_notifier_lock);
322 list_for_each_entry(raw_busy_notifier, &raw_notifier_list, notifier) {
323 spin_unlock(&raw_notifier_lock);
324 raw_notify(raw_busy_notifier, msg, dev);
325 spin_lock(&raw_notifier_lock);
326 }
327 raw_busy_notifier = NULL;
328 spin_unlock(&raw_notifier_lock);
329 return NOTIFY_DONE;
330}
331
332static int raw_init(struct sock *sk)
333{
334 struct raw_sock *ro = raw_sk(sk);
335
336 ro->bound = 0;
337 ro->ifindex = 0;
338
339 /* set default filter to single entry dfilter */
340 ro->dfilter.can_id = 0;
341 ro->dfilter.can_mask = MASK_ALL;
342 ro->filter = &ro->dfilter;
343 ro->count = 1;
344
345 /* set default loopback behaviour */
346 ro->loopback = 1;
347 ro->recv_own_msgs = 0;
348 ro->fd_frames = 0;
349 ro->join_filters = 0;
350
351 /* alloc_percpu provides zero'ed memory */
352 ro->uniq = alloc_percpu(struct uniqframe);
353 if (unlikely(!ro->uniq))
354 return -ENOMEM;
355
356 /* set notifier */
357 spin_lock(&raw_notifier_lock);
358 list_add_tail(&ro->notifier, &raw_notifier_list);
359 spin_unlock(&raw_notifier_lock);
360
361 return 0;
362}
363
364static int raw_release(struct socket *sock)
365{
366 struct sock *sk = sock->sk;
367 struct raw_sock *ro;
368
369 if (!sk)
370 return 0;
371
372 ro = raw_sk(sk);
373
374 spin_lock(&raw_notifier_lock);
375 while (raw_busy_notifier == ro) {
376 spin_unlock(&raw_notifier_lock);
377 schedule_timeout_uninterruptible(1);
378 spin_lock(&raw_notifier_lock);
379 }
380 list_del(&ro->notifier);
381 spin_unlock(&raw_notifier_lock);
382
383 lock_sock(sk);
384
385 /* remove current filters & unregister */
386 if (ro->bound) {
387 if (ro->ifindex) {
388 struct net_device *dev;
389
390 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
391 if (dev) {
392 raw_disable_allfilters(dev_net(dev), dev, sk);
393 dev_put(dev);
394 }
395 } else {
396 raw_disable_allfilters(sock_net(sk), NULL, sk);
397 }
398 }
399
400 if (ro->count > 1)
401 kfree(ro->filter);
402
403 ro->ifindex = 0;
404 ro->bound = 0;
405 ro->count = 0;
406 free_percpu(ro->uniq);
407
408 sock_orphan(sk);
409 sock->sk = NULL;
410
411 release_sock(sk);
412 sock_put(sk);
413
414 return 0;
415}
416
417static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
418{
419 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
420 struct sock *sk = sock->sk;
421 struct raw_sock *ro = raw_sk(sk);
422 int ifindex;
423 int err = 0;
424 int notify_enetdown = 0;
425
426 if (len < RAW_MIN_NAMELEN)
427 return -EINVAL;
428 if (addr->can_family != AF_CAN)
429 return -EINVAL;
430
431 lock_sock(sk);
432
433 if (ro->bound && addr->can_ifindex == ro->ifindex)
434 goto out;
435
436 if (addr->can_ifindex) {
437 struct net_device *dev;
438
439 dev = dev_get_by_index(sock_net(sk), addr->can_ifindex);
440 if (!dev) {
441 err = -ENODEV;
442 goto out;
443 }
444 if (dev->type != ARPHRD_CAN) {
445 dev_put(dev);
446 err = -ENODEV;
447 goto out;
448 }
449 if (!(dev->flags & IFF_UP))
450 notify_enetdown = 1;
451
452 ifindex = dev->ifindex;
453
454 /* filters set by default/setsockopt */
455 err = raw_enable_allfilters(sock_net(sk), dev, sk);
456 dev_put(dev);
457 } else {
458 ifindex = 0;
459
460 /* filters set by default/setsockopt */
461 err = raw_enable_allfilters(sock_net(sk), NULL, sk);
462 }
463
464 if (!err) {
465 if (ro->bound) {
466 /* unregister old filters */
467 if (ro->ifindex) {
468 struct net_device *dev;
469
470 dev = dev_get_by_index(sock_net(sk),
471 ro->ifindex);
472 if (dev) {
473 raw_disable_allfilters(dev_net(dev),
474 dev, sk);
475 dev_put(dev);
476 }
477 } else {
478 raw_disable_allfilters(sock_net(sk), NULL, sk);
479 }
480 }
481 ro->ifindex = ifindex;
482 ro->bound = 1;
483 }
484
485 out:
486 release_sock(sk);
487
488 if (notify_enetdown) {
489 sk->sk_err = ENETDOWN;
490 if (!sock_flag(sk, SOCK_DEAD))
491 sk_error_report(sk);
492 }
493
494 return err;
495}
496
497static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
498 int peer)
499{
500 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
501 struct sock *sk = sock->sk;
502 struct raw_sock *ro = raw_sk(sk);
503
504 if (peer)
505 return -EOPNOTSUPP;
506
507 memset(addr, 0, RAW_MIN_NAMELEN);
508 addr->can_family = AF_CAN;
509 addr->can_ifindex = ro->ifindex;
510
511 return RAW_MIN_NAMELEN;
512}
513
514static int raw_setsockopt(struct socket *sock, int level, int optname,
515 sockptr_t optval, unsigned int optlen)
516{
517 struct sock *sk = sock->sk;
518 struct raw_sock *ro = raw_sk(sk);
519 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
520 struct can_filter sfilter; /* single filter */
521 struct net_device *dev = NULL;
522 can_err_mask_t err_mask = 0;
523 int count = 0;
524 int err = 0;
525
526 if (level != SOL_CAN_RAW)
527 return -EINVAL;
528
529 switch (optname) {
530 case CAN_RAW_FILTER:
531 if (optlen % sizeof(struct can_filter) != 0)
532 return -EINVAL;
533
534 if (optlen > CAN_RAW_FILTER_MAX * sizeof(struct can_filter))
535 return -EINVAL;
536
537 count = optlen / sizeof(struct can_filter);
538
539 if (count > 1) {
540 /* filter does not fit into dfilter => alloc space */
541 filter = memdup_sockptr(optval, optlen);
542 if (IS_ERR(filter))
543 return PTR_ERR(filter);
544 } else if (count == 1) {
545 if (copy_from_sockptr(&sfilter, optval, sizeof(sfilter)))
546 return -EFAULT;
547 }
548
549 rtnl_lock();
550 lock_sock(sk);
551
552 if (ro->bound && ro->ifindex) {
553 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
554 if (!dev) {
555 if (count > 1)
556 kfree(filter);
557 err = -ENODEV;
558 goto out_fil;
559 }
560 }
561
562 if (ro->bound) {
563 /* (try to) register the new filters */
564 if (count == 1)
565 err = raw_enable_filters(sock_net(sk), dev, sk,
566 &sfilter, 1);
567 else
568 err = raw_enable_filters(sock_net(sk), dev, sk,
569 filter, count);
570 if (err) {
571 if (count > 1)
572 kfree(filter);
573 goto out_fil;
574 }
575
576 /* remove old filter registrations */
577 raw_disable_filters(sock_net(sk), dev, sk, ro->filter,
578 ro->count);
579 }
580
581 /* remove old filter space */
582 if (ro->count > 1)
583 kfree(ro->filter);
584
585 /* link new filters to the socket */
586 if (count == 1) {
587 /* copy filter data for single filter */
588 ro->dfilter = sfilter;
589 filter = &ro->dfilter;
590 }
591 ro->filter = filter;
592 ro->count = count;
593
594 out_fil:
595 if (dev)
596 dev_put(dev);
597
598 release_sock(sk);
599 rtnl_unlock();
600
601 break;
602
603 case CAN_RAW_ERR_FILTER:
604 if (optlen != sizeof(err_mask))
605 return -EINVAL;
606
607 if (copy_from_sockptr(&err_mask, optval, optlen))
608 return -EFAULT;
609
610 err_mask &= CAN_ERR_MASK;
611
612 rtnl_lock();
613 lock_sock(sk);
614
615 if (ro->bound && ro->ifindex) {
616 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
617 if (!dev) {
618 err = -ENODEV;
619 goto out_err;
620 }
621 }
622
623 /* remove current error mask */
624 if (ro->bound) {
625 /* (try to) register the new err_mask */
626 err = raw_enable_errfilter(sock_net(sk), dev, sk,
627 err_mask);
628
629 if (err)
630 goto out_err;
631
632 /* remove old err_mask registration */
633 raw_disable_errfilter(sock_net(sk), dev, sk,
634 ro->err_mask);
635 }
636
637 /* link new err_mask to the socket */
638 ro->err_mask = err_mask;
639
640 out_err:
641 if (dev)
642 dev_put(dev);
643
644 release_sock(sk);
645 rtnl_unlock();
646
647 break;
648
649 case CAN_RAW_LOOPBACK:
650 if (optlen != sizeof(ro->loopback))
651 return -EINVAL;
652
653 if (copy_from_sockptr(&ro->loopback, optval, optlen))
654 return -EFAULT;
655
656 break;
657
658 case CAN_RAW_RECV_OWN_MSGS:
659 if (optlen != sizeof(ro->recv_own_msgs))
660 return -EINVAL;
661
662 if (copy_from_sockptr(&ro->recv_own_msgs, optval, optlen))
663 return -EFAULT;
664
665 break;
666
667 case CAN_RAW_FD_FRAMES:
668 if (optlen != sizeof(ro->fd_frames))
669 return -EINVAL;
670
671 if (copy_from_sockptr(&ro->fd_frames, optval, optlen))
672 return -EFAULT;
673
674 break;
675
676 case CAN_RAW_JOIN_FILTERS:
677 if (optlen != sizeof(ro->join_filters))
678 return -EINVAL;
679
680 if (copy_from_sockptr(&ro->join_filters, optval, optlen))
681 return -EFAULT;
682
683 break;
684
685 default:
686 return -ENOPROTOOPT;
687 }
688 return err;
689}
690
691static int raw_getsockopt(struct socket *sock, int level, int optname,
692 char __user *optval, int __user *optlen)
693{
694 struct sock *sk = sock->sk;
695 struct raw_sock *ro = raw_sk(sk);
696 int len;
697 void *val;
698 int err = 0;
699
700 if (level != SOL_CAN_RAW)
701 return -EINVAL;
702 if (get_user(len, optlen))
703 return -EFAULT;
704 if (len < 0)
705 return -EINVAL;
706
707 switch (optname) {
708 case CAN_RAW_FILTER:
709 lock_sock(sk);
710 if (ro->count > 0) {
711 int fsize = ro->count * sizeof(struct can_filter);
712
713 /* user space buffer to small for filter list? */
714 if (len < fsize) {
715 /* return -ERANGE and needed space in optlen */
716 err = -ERANGE;
717 if (put_user(fsize, optlen))
718 err = -EFAULT;
719 } else {
720 if (len > fsize)
721 len = fsize;
722 if (copy_to_user(optval, ro->filter, len))
723 err = -EFAULT;
724 }
725 } else {
726 len = 0;
727 }
728 release_sock(sk);
729
730 if (!err)
731 err = put_user(len, optlen);
732 return err;
733
734 case CAN_RAW_ERR_FILTER:
735 if (len > sizeof(can_err_mask_t))
736 len = sizeof(can_err_mask_t);
737 val = &ro->err_mask;
738 break;
739
740 case CAN_RAW_LOOPBACK:
741 if (len > sizeof(int))
742 len = sizeof(int);
743 val = &ro->loopback;
744 break;
745
746 case CAN_RAW_RECV_OWN_MSGS:
747 if (len > sizeof(int))
748 len = sizeof(int);
749 val = &ro->recv_own_msgs;
750 break;
751
752 case CAN_RAW_FD_FRAMES:
753 if (len > sizeof(int))
754 len = sizeof(int);
755 val = &ro->fd_frames;
756 break;
757
758 case CAN_RAW_JOIN_FILTERS:
759 if (len > sizeof(int))
760 len = sizeof(int);
761 val = &ro->join_filters;
762 break;
763
764 default:
765 return -ENOPROTOOPT;
766 }
767
768 if (put_user(len, optlen))
769 return -EFAULT;
770 if (copy_to_user(optval, val, len))
771 return -EFAULT;
772 return 0;
773}
774
775static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
776{
777 struct sock *sk = sock->sk;
778 struct raw_sock *ro = raw_sk(sk);
779 struct sk_buff *skb;
780 struct net_device *dev;
781 int ifindex;
782 int err;
783
784 if (msg->msg_name) {
785 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
786
787 if (msg->msg_namelen < RAW_MIN_NAMELEN)
788 return -EINVAL;
789
790 if (addr->can_family != AF_CAN)
791 return -EINVAL;
792
793 ifindex = addr->can_ifindex;
794 } else {
795 ifindex = ro->ifindex;
796 }
797
798 dev = dev_get_by_index(sock_net(sk), ifindex);
799 if (!dev)
800 return -ENXIO;
801
802 err = -EINVAL;
803 if (ro->fd_frames && dev->mtu == CANFD_MTU) {
804 if (unlikely(size != CANFD_MTU && size != CAN_MTU))
805 goto put_dev;
806 } else {
807 if (unlikely(size != CAN_MTU))
808 goto put_dev;
809 }
810
811 skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
812 msg->msg_flags & MSG_DONTWAIT, &err);
813 if (!skb)
814 goto put_dev;
815
816 can_skb_reserve(skb);
817 can_skb_prv(skb)->ifindex = dev->ifindex;
818 can_skb_prv(skb)->skbcnt = 0;
819
820 err = memcpy_from_msg(skb_put(skb, size), msg, size);
821 if (err < 0)
822 goto free_skb;
823
824 skb_setup_tx_timestamp(skb, sk->sk_tsflags);
825
826 skb->dev = dev;
827 skb->sk = sk;
828 skb->priority = sk->sk_priority;
829
830 err = can_send(skb, ro->loopback);
831
832 dev_put(dev);
833
834 if (err)
835 goto send_failed;
836
837 return size;
838
839free_skb:
840 kfree_skb(skb);
841put_dev:
842 dev_put(dev);
843send_failed:
844 return err;
845}
846
847static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
848 int flags)
849{
850 struct sock *sk = sock->sk;
851 struct sk_buff *skb;
852 int err = 0;
853 int noblock;
854
855 noblock = flags & MSG_DONTWAIT;
856 flags &= ~MSG_DONTWAIT;
857
858 if (flags & MSG_ERRQUEUE)
859 return sock_recv_errqueue(sk, msg, size,
860 SOL_CAN_RAW, SCM_CAN_RAW_ERRQUEUE);
861
862 skb = skb_recv_datagram(sk, flags, noblock, &err);
863 if (!skb)
864 return err;
865
866 if (size < skb->len)
867 msg->msg_flags |= MSG_TRUNC;
868 else
869 size = skb->len;
870
871 err = memcpy_to_msg(msg, skb->data, size);
872 if (err < 0) {
873 skb_free_datagram(sk, skb);
874 return err;
875 }
876
877 sock_recv_ts_and_drops(msg, sk, skb);
878
879 if (msg->msg_name) {
880 __sockaddr_check_size(RAW_MIN_NAMELEN);
881 msg->msg_namelen = RAW_MIN_NAMELEN;
882 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
883 }
884
885 /* assign the flags that have been recorded in raw_rcv() */
886 msg->msg_flags |= *(raw_flags(skb));
887
888 skb_free_datagram(sk, skb);
889
890 return size;
891}
892
893static int raw_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
894 unsigned long arg)
895{
896 /* no ioctls for socket layer -> hand it down to NIC layer */
897 return -ENOIOCTLCMD;
898}
899
900static const struct proto_ops raw_ops = {
901 .family = PF_CAN,
902 .release = raw_release,
903 .bind = raw_bind,
904 .connect = sock_no_connect,
905 .socketpair = sock_no_socketpair,
906 .accept = sock_no_accept,
907 .getname = raw_getname,
908 .poll = datagram_poll,
909 .ioctl = raw_sock_no_ioctlcmd,
910 .gettstamp = sock_gettstamp,
911 .listen = sock_no_listen,
912 .shutdown = sock_no_shutdown,
913 .setsockopt = raw_setsockopt,
914 .getsockopt = raw_getsockopt,
915 .sendmsg = raw_sendmsg,
916 .recvmsg = raw_recvmsg,
917 .mmap = sock_no_mmap,
918 .sendpage = sock_no_sendpage,
919};
920
921static struct proto raw_proto __read_mostly = {
922 .name = "CAN_RAW",
923 .owner = THIS_MODULE,
924 .obj_size = sizeof(struct raw_sock),
925 .init = raw_init,
926};
927
928static const struct can_proto raw_can_proto = {
929 .type = SOCK_RAW,
930 .protocol = CAN_RAW,
931 .ops = &raw_ops,
932 .prot = &raw_proto,
933};
934
935static struct notifier_block canraw_notifier = {
936 .notifier_call = raw_notifier
937};
938
939static __init int raw_module_init(void)
940{
941 int err;
942
943 pr_info("can: raw protocol\n");
944
945 err = can_proto_register(&raw_can_proto);
946 if (err < 0)
947 pr_err("can: registration of raw protocol failed\n");
948 else
949 register_netdevice_notifier(&canraw_notifier);
950
951 return err;
952}
953
954static __exit void raw_module_exit(void)
955{
956 can_proto_unregister(&raw_can_proto);
957 unregister_netdevice_notifier(&canraw_notifier);
958}
959
960module_init(raw_module_init);
961module_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/skb.h>
54#include <linux/can/raw.h>
55#include <net/sock.h>
56#include <net/net_namespace.h>
57
58#define CAN_RAW_VERSION CAN_VERSION
59
60MODULE_DESCRIPTION("PF_CAN raw protocol");
61MODULE_LICENSE("Dual BSD/GPL");
62MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
63MODULE_ALIAS("can-proto-1");
64
65#define MASK_ALL 0
66
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 notifier_block notifier;
88 int loopback;
89 int recv_own_msgs;
90 int fd_frames;
91 int join_filters;
92 int count; /* number of active filters */
93 struct can_filter dfilter; /* default/single filter */
94 struct can_filter *filter; /* pointer to filter(s) */
95 can_err_mask_t err_mask;
96 struct uniqframe __percpu *uniq;
97};
98
99/*
100 * Return pointer to store the extra msg flags for raw_recvmsg().
101 * We use the space of one unsigned int beyond the 'struct sockaddr_can'
102 * in skb->cb.
103 */
104static inline unsigned int *raw_flags(struct sk_buff *skb)
105{
106 sock_skb_cb_check_size(sizeof(struct sockaddr_can) +
107 sizeof(unsigned int));
108
109 /* return pointer after struct sockaddr_can */
110 return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
111}
112
113static inline struct raw_sock *raw_sk(const struct sock *sk)
114{
115 return (struct raw_sock *)sk;
116}
117
118static void raw_rcv(struct sk_buff *oskb, void *data)
119{
120 struct sock *sk = (struct sock *)data;
121 struct raw_sock *ro = raw_sk(sk);
122 struct sockaddr_can *addr;
123 struct sk_buff *skb;
124 unsigned int *pflags;
125
126 /* check the received tx sock reference */
127 if (!ro->recv_own_msgs && oskb->sk == sk)
128 return;
129
130 /* do not pass non-CAN2.0 frames to a legacy socket */
131 if (!ro->fd_frames && oskb->len != CAN_MTU)
132 return;
133
134 /* eliminate multiple filter matches for the same skb */
135 if (this_cpu_ptr(ro->uniq)->skb == oskb &&
136 this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
137 if (ro->join_filters) {
138 this_cpu_inc(ro->uniq->join_rx_count);
139 /* drop frame until all enabled filters matched */
140 if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count)
141 return;
142 } else {
143 return;
144 }
145 } else {
146 this_cpu_ptr(ro->uniq)->skb = oskb;
147 this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
148 this_cpu_ptr(ro->uniq)->join_rx_count = 1;
149 /* drop first frame to check all enabled filters? */
150 if (ro->join_filters && ro->count > 1)
151 return;
152 }
153
154 /* clone the given skb to be able to enqueue it into the rcv queue */
155 skb = skb_clone(oskb, GFP_ATOMIC);
156 if (!skb)
157 return;
158
159 /*
160 * Put the datagram to the queue so that raw_recvmsg() can
161 * get it from there. We need to pass the interface index to
162 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
163 * containing the interface index.
164 */
165
166 sock_skb_cb_check_size(sizeof(struct sockaddr_can));
167 addr = (struct sockaddr_can *)skb->cb;
168 memset(addr, 0, sizeof(*addr));
169 addr->can_family = AF_CAN;
170 addr->can_ifindex = skb->dev->ifindex;
171
172 /* add CAN specific message flags for raw_recvmsg() */
173 pflags = raw_flags(skb);
174 *pflags = 0;
175 if (oskb->sk)
176 *pflags |= MSG_DONTROUTE;
177 if (oskb->sk == sk)
178 *pflags |= MSG_CONFIRM;
179
180 if (sock_queue_rcv_skb(sk, skb) < 0)
181 kfree_skb(skb);
182}
183
184static int raw_enable_filters(struct net_device *dev, struct sock *sk,
185 struct can_filter *filter, int count)
186{
187 int err = 0;
188 int i;
189
190 for (i = 0; i < count; i++) {
191 err = can_rx_register(dev, filter[i].can_id,
192 filter[i].can_mask,
193 raw_rcv, sk, "raw");
194 if (err) {
195 /* clean up successfully registered filters */
196 while (--i >= 0)
197 can_rx_unregister(dev, filter[i].can_id,
198 filter[i].can_mask,
199 raw_rcv, sk);
200 break;
201 }
202 }
203
204 return err;
205}
206
207static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
208 can_err_mask_t err_mask)
209{
210 int err = 0;
211
212 if (err_mask)
213 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
214 raw_rcv, sk, "raw");
215
216 return err;
217}
218
219static void raw_disable_filters(struct net_device *dev, struct sock *sk,
220 struct can_filter *filter, int count)
221{
222 int i;
223
224 for (i = 0; i < count; i++)
225 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
226 raw_rcv, sk);
227}
228
229static inline void raw_disable_errfilter(struct net_device *dev,
230 struct sock *sk,
231 can_err_mask_t err_mask)
232
233{
234 if (err_mask)
235 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
236 raw_rcv, sk);
237}
238
239static inline void raw_disable_allfilters(struct net_device *dev,
240 struct sock *sk)
241{
242 struct raw_sock *ro = raw_sk(sk);
243
244 raw_disable_filters(dev, sk, ro->filter, ro->count);
245 raw_disable_errfilter(dev, sk, ro->err_mask);
246}
247
248static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
249{
250 struct raw_sock *ro = raw_sk(sk);
251 int err;
252
253 err = raw_enable_filters(dev, sk, ro->filter, ro->count);
254 if (!err) {
255 err = raw_enable_errfilter(dev, sk, ro->err_mask);
256 if (err)
257 raw_disable_filters(dev, sk, ro->filter, ro->count);
258 }
259
260 return err;
261}
262
263static int raw_notifier(struct notifier_block *nb,
264 unsigned long msg, void *ptr)
265{
266 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
267 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
268 struct sock *sk = &ro->sk;
269
270 if (!net_eq(dev_net(dev), &init_net))
271 return NOTIFY_DONE;
272
273 if (dev->type != ARPHRD_CAN)
274 return NOTIFY_DONE;
275
276 if (ro->ifindex != dev->ifindex)
277 return NOTIFY_DONE;
278
279 switch (msg) {
280
281 case NETDEV_UNREGISTER:
282 lock_sock(sk);
283 /* remove current filters & unregister */
284 if (ro->bound)
285 raw_disable_allfilters(dev, sk);
286
287 if (ro->count > 1)
288 kfree(ro->filter);
289
290 ro->ifindex = 0;
291 ro->bound = 0;
292 ro->count = 0;
293 release_sock(sk);
294
295 sk->sk_err = ENODEV;
296 if (!sock_flag(sk, SOCK_DEAD))
297 sk->sk_error_report(sk);
298 break;
299
300 case NETDEV_DOWN:
301 sk->sk_err = ENETDOWN;
302 if (!sock_flag(sk, SOCK_DEAD))
303 sk->sk_error_report(sk);
304 break;
305 }
306
307 return NOTIFY_DONE;
308}
309
310static int raw_init(struct sock *sk)
311{
312 struct raw_sock *ro = raw_sk(sk);
313
314 ro->bound = 0;
315 ro->ifindex = 0;
316
317 /* set default filter to single entry dfilter */
318 ro->dfilter.can_id = 0;
319 ro->dfilter.can_mask = MASK_ALL;
320 ro->filter = &ro->dfilter;
321 ro->count = 1;
322
323 /* set default loopback behaviour */
324 ro->loopback = 1;
325 ro->recv_own_msgs = 0;
326 ro->fd_frames = 0;
327 ro->join_filters = 0;
328
329 /* alloc_percpu provides zero'ed memory */
330 ro->uniq = alloc_percpu(struct uniqframe);
331 if (unlikely(!ro->uniq))
332 return -ENOMEM;
333
334 /* set notifier */
335 ro->notifier.notifier_call = raw_notifier;
336
337 register_netdevice_notifier(&ro->notifier);
338
339 return 0;
340}
341
342static int raw_release(struct socket *sock)
343{
344 struct sock *sk = sock->sk;
345 struct raw_sock *ro;
346
347 if (!sk)
348 return 0;
349
350 ro = raw_sk(sk);
351
352 unregister_netdevice_notifier(&ro->notifier);
353
354 lock_sock(sk);
355
356 /* remove current filters & unregister */
357 if (ro->bound) {
358 if (ro->ifindex) {
359 struct net_device *dev;
360
361 dev = dev_get_by_index(&init_net, ro->ifindex);
362 if (dev) {
363 raw_disable_allfilters(dev, sk);
364 dev_put(dev);
365 }
366 } else
367 raw_disable_allfilters(NULL, sk);
368 }
369
370 if (ro->count > 1)
371 kfree(ro->filter);
372
373 ro->ifindex = 0;
374 ro->bound = 0;
375 ro->count = 0;
376 free_percpu(ro->uniq);
377
378 sock_orphan(sk);
379 sock->sk = NULL;
380
381 release_sock(sk);
382 sock_put(sk);
383
384 return 0;
385}
386
387static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
388{
389 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
390 struct sock *sk = sock->sk;
391 struct raw_sock *ro = raw_sk(sk);
392 int ifindex;
393 int err = 0;
394 int notify_enetdown = 0;
395
396 if (len < sizeof(*addr))
397 return -EINVAL;
398
399 lock_sock(sk);
400
401 if (ro->bound && addr->can_ifindex == ro->ifindex)
402 goto out;
403
404 if (addr->can_ifindex) {
405 struct net_device *dev;
406
407 dev = dev_get_by_index(&init_net, addr->can_ifindex);
408 if (!dev) {
409 err = -ENODEV;
410 goto out;
411 }
412 if (dev->type != ARPHRD_CAN) {
413 dev_put(dev);
414 err = -ENODEV;
415 goto out;
416 }
417 if (!(dev->flags & IFF_UP))
418 notify_enetdown = 1;
419
420 ifindex = dev->ifindex;
421
422 /* filters set by default/setsockopt */
423 err = raw_enable_allfilters(dev, sk);
424 dev_put(dev);
425 } else {
426 ifindex = 0;
427
428 /* filters set by default/setsockopt */
429 err = raw_enable_allfilters(NULL, sk);
430 }
431
432 if (!err) {
433 if (ro->bound) {
434 /* unregister old filters */
435 if (ro->ifindex) {
436 struct net_device *dev;
437
438 dev = dev_get_by_index(&init_net, ro->ifindex);
439 if (dev) {
440 raw_disable_allfilters(dev, sk);
441 dev_put(dev);
442 }
443 } else
444 raw_disable_allfilters(NULL, sk);
445 }
446 ro->ifindex = ifindex;
447 ro->bound = 1;
448 }
449
450 out:
451 release_sock(sk);
452
453 if (notify_enetdown) {
454 sk->sk_err = ENETDOWN;
455 if (!sock_flag(sk, SOCK_DEAD))
456 sk->sk_error_report(sk);
457 }
458
459 return err;
460}
461
462static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
463 int *len, int peer)
464{
465 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
466 struct sock *sk = sock->sk;
467 struct raw_sock *ro = raw_sk(sk);
468
469 if (peer)
470 return -EOPNOTSUPP;
471
472 memset(addr, 0, sizeof(*addr));
473 addr->can_family = AF_CAN;
474 addr->can_ifindex = ro->ifindex;
475
476 *len = sizeof(*addr);
477
478 return 0;
479}
480
481static int raw_setsockopt(struct socket *sock, int level, int optname,
482 char __user *optval, unsigned int optlen)
483{
484 struct sock *sk = sock->sk;
485 struct raw_sock *ro = raw_sk(sk);
486 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
487 struct can_filter sfilter; /* single filter */
488 struct net_device *dev = NULL;
489 can_err_mask_t err_mask = 0;
490 int count = 0;
491 int err = 0;
492
493 if (level != SOL_CAN_RAW)
494 return -EINVAL;
495
496 switch (optname) {
497
498 case CAN_RAW_FILTER:
499 if (optlen % sizeof(struct can_filter) != 0)
500 return -EINVAL;
501
502 count = optlen / sizeof(struct can_filter);
503
504 if (count > 1) {
505 /* filter does not fit into dfilter => alloc space */
506 filter = memdup_user(optval, optlen);
507 if (IS_ERR(filter))
508 return PTR_ERR(filter);
509 } else if (count == 1) {
510 if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
511 return -EFAULT;
512 }
513
514 lock_sock(sk);
515
516 if (ro->bound && ro->ifindex)
517 dev = dev_get_by_index(&init_net, ro->ifindex);
518
519 if (ro->bound) {
520 /* (try to) register the new filters */
521 if (count == 1)
522 err = raw_enable_filters(dev, sk, &sfilter, 1);
523 else
524 err = raw_enable_filters(dev, sk, filter,
525 count);
526 if (err) {
527 if (count > 1)
528 kfree(filter);
529 goto out_fil;
530 }
531
532 /* remove old filter registrations */
533 raw_disable_filters(dev, sk, ro->filter, ro->count);
534 }
535
536 /* remove old filter space */
537 if (ro->count > 1)
538 kfree(ro->filter);
539
540 /* link new filters to the socket */
541 if (count == 1) {
542 /* copy filter data for single filter */
543 ro->dfilter = sfilter;
544 filter = &ro->dfilter;
545 }
546 ro->filter = filter;
547 ro->count = count;
548
549 out_fil:
550 if (dev)
551 dev_put(dev);
552
553 release_sock(sk);
554
555 break;
556
557 case CAN_RAW_ERR_FILTER:
558 if (optlen != sizeof(err_mask))
559 return -EINVAL;
560
561 if (copy_from_user(&err_mask, optval, optlen))
562 return -EFAULT;
563
564 err_mask &= CAN_ERR_MASK;
565
566 lock_sock(sk);
567
568 if (ro->bound && ro->ifindex)
569 dev = dev_get_by_index(&init_net, ro->ifindex);
570
571 /* remove current error mask */
572 if (ro->bound) {
573 /* (try to) register the new err_mask */
574 err = raw_enable_errfilter(dev, sk, err_mask);
575
576 if (err)
577 goto out_err;
578
579 /* remove old err_mask registration */
580 raw_disable_errfilter(dev, sk, ro->err_mask);
581 }
582
583 /* link new err_mask to the socket */
584 ro->err_mask = err_mask;
585
586 out_err:
587 if (dev)
588 dev_put(dev);
589
590 release_sock(sk);
591
592 break;
593
594 case CAN_RAW_LOOPBACK:
595 if (optlen != sizeof(ro->loopback))
596 return -EINVAL;
597
598 if (copy_from_user(&ro->loopback, optval, optlen))
599 return -EFAULT;
600
601 break;
602
603 case CAN_RAW_RECV_OWN_MSGS:
604 if (optlen != sizeof(ro->recv_own_msgs))
605 return -EINVAL;
606
607 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
608 return -EFAULT;
609
610 break;
611
612 case CAN_RAW_FD_FRAMES:
613 if (optlen != sizeof(ro->fd_frames))
614 return -EINVAL;
615
616 if (copy_from_user(&ro->fd_frames, optval, optlen))
617 return -EFAULT;
618
619 break;
620
621 case CAN_RAW_JOIN_FILTERS:
622 if (optlen != sizeof(ro->join_filters))
623 return -EINVAL;
624
625 if (copy_from_user(&ro->join_filters, optval, optlen))
626 return -EFAULT;
627
628 break;
629
630 default:
631 return -ENOPROTOOPT;
632 }
633 return err;
634}
635
636static int raw_getsockopt(struct socket *sock, int level, int optname,
637 char __user *optval, int __user *optlen)
638{
639 struct sock *sk = sock->sk;
640 struct raw_sock *ro = raw_sk(sk);
641 int len;
642 void *val;
643 int err = 0;
644
645 if (level != SOL_CAN_RAW)
646 return -EINVAL;
647 if (get_user(len, optlen))
648 return -EFAULT;
649 if (len < 0)
650 return -EINVAL;
651
652 switch (optname) {
653
654 case CAN_RAW_FILTER:
655 lock_sock(sk);
656 if (ro->count > 0) {
657 int fsize = ro->count * sizeof(struct can_filter);
658 if (len > fsize)
659 len = fsize;
660 if (copy_to_user(optval, ro->filter, len))
661 err = -EFAULT;
662 } else
663 len = 0;
664 release_sock(sk);
665
666 if (!err)
667 err = put_user(len, optlen);
668 return err;
669
670 case CAN_RAW_ERR_FILTER:
671 if (len > sizeof(can_err_mask_t))
672 len = sizeof(can_err_mask_t);
673 val = &ro->err_mask;
674 break;
675
676 case CAN_RAW_LOOPBACK:
677 if (len > sizeof(int))
678 len = sizeof(int);
679 val = &ro->loopback;
680 break;
681
682 case CAN_RAW_RECV_OWN_MSGS:
683 if (len > sizeof(int))
684 len = sizeof(int);
685 val = &ro->recv_own_msgs;
686 break;
687
688 case CAN_RAW_FD_FRAMES:
689 if (len > sizeof(int))
690 len = sizeof(int);
691 val = &ro->fd_frames;
692 break;
693
694 case CAN_RAW_JOIN_FILTERS:
695 if (len > sizeof(int))
696 len = sizeof(int);
697 val = &ro->join_filters;
698 break;
699
700 default:
701 return -ENOPROTOOPT;
702 }
703
704 if (put_user(len, optlen))
705 return -EFAULT;
706 if (copy_to_user(optval, val, len))
707 return -EFAULT;
708 return 0;
709}
710
711static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
712{
713 struct sock *sk = sock->sk;
714 struct raw_sock *ro = raw_sk(sk);
715 struct sk_buff *skb;
716 struct net_device *dev;
717 int ifindex;
718 int err;
719
720 if (msg->msg_name) {
721 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
722
723 if (msg->msg_namelen < sizeof(*addr))
724 return -EINVAL;
725
726 if (addr->can_family != AF_CAN)
727 return -EINVAL;
728
729 ifindex = addr->can_ifindex;
730 } else
731 ifindex = ro->ifindex;
732
733 if (ro->fd_frames) {
734 if (unlikely(size != CANFD_MTU && size != CAN_MTU))
735 return -EINVAL;
736 } else {
737 if (unlikely(size != CAN_MTU))
738 return -EINVAL;
739 }
740
741 dev = dev_get_by_index(&init_net, ifindex);
742 if (!dev)
743 return -ENXIO;
744
745 skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
746 msg->msg_flags & MSG_DONTWAIT, &err);
747 if (!skb)
748 goto put_dev;
749
750 can_skb_reserve(skb);
751 can_skb_prv(skb)->ifindex = dev->ifindex;
752 can_skb_prv(skb)->skbcnt = 0;
753
754 err = memcpy_from_msg(skb_put(skb, size), msg, size);
755 if (err < 0)
756 goto free_skb;
757
758 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
759
760 skb->dev = dev;
761 skb->sk = sk;
762 skb->priority = sk->sk_priority;
763
764 err = can_send(skb, ro->loopback);
765
766 dev_put(dev);
767
768 if (err)
769 goto send_failed;
770
771 return size;
772
773free_skb:
774 kfree_skb(skb);
775put_dev:
776 dev_put(dev);
777send_failed:
778 return err;
779}
780
781static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
782 int flags)
783{
784 struct sock *sk = sock->sk;
785 struct sk_buff *skb;
786 int err = 0;
787 int noblock;
788
789 noblock = flags & MSG_DONTWAIT;
790 flags &= ~MSG_DONTWAIT;
791
792 skb = skb_recv_datagram(sk, flags, noblock, &err);
793 if (!skb)
794 return err;
795
796 if (size < skb->len)
797 msg->msg_flags |= MSG_TRUNC;
798 else
799 size = skb->len;
800
801 err = memcpy_to_msg(msg, skb->data, size);
802 if (err < 0) {
803 skb_free_datagram(sk, skb);
804 return err;
805 }
806
807 sock_recv_ts_and_drops(msg, sk, skb);
808
809 if (msg->msg_name) {
810 __sockaddr_check_size(sizeof(struct sockaddr_can));
811 msg->msg_namelen = sizeof(struct sockaddr_can);
812 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
813 }
814
815 /* assign the flags that have been recorded in raw_rcv() */
816 msg->msg_flags |= *(raw_flags(skb));
817
818 skb_free_datagram(sk, skb);
819
820 return size;
821}
822
823static const struct proto_ops raw_ops = {
824 .family = PF_CAN,
825 .release = raw_release,
826 .bind = raw_bind,
827 .connect = sock_no_connect,
828 .socketpair = sock_no_socketpair,
829 .accept = sock_no_accept,
830 .getname = raw_getname,
831 .poll = datagram_poll,
832 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
833 .listen = sock_no_listen,
834 .shutdown = sock_no_shutdown,
835 .setsockopt = raw_setsockopt,
836 .getsockopt = raw_getsockopt,
837 .sendmsg = raw_sendmsg,
838 .recvmsg = raw_recvmsg,
839 .mmap = sock_no_mmap,
840 .sendpage = sock_no_sendpage,
841};
842
843static struct proto raw_proto __read_mostly = {
844 .name = "CAN_RAW",
845 .owner = THIS_MODULE,
846 .obj_size = sizeof(struct raw_sock),
847 .init = raw_init,
848};
849
850static const struct can_proto raw_can_proto = {
851 .type = SOCK_RAW,
852 .protocol = CAN_RAW,
853 .ops = &raw_ops,
854 .prot = &raw_proto,
855};
856
857static __init int raw_module_init(void)
858{
859 int err;
860
861 pr_info("can: raw protocol (rev " CAN_RAW_VERSION ")\n");
862
863 err = can_proto_register(&raw_can_proto);
864 if (err < 0)
865 printk(KERN_ERR "can: registration of raw protocol failed\n");
866
867 return err;
868}
869
870static __exit void raw_module_exit(void)
871{
872 can_proto_unregister(&raw_can_proto);
873}
874
875module_init(raw_module_init);
876module_exit(raw_module_exit);