blob: 081e81fd017fa53f7a6ed3afd341601b43377531 [file] [log] [blame]
Oliver Hartkoppc18ce102007-11-16 15:53:09 -08001/*
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 *
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080040 */
41
42#include <linux/module.h>
43#include <linux/init.h>
44#include <linux/uio.h>
45#include <linux/net.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090046#include <linux/slab.h>
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080047#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>
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +010053#include <linux/can/skb.h>
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080054#include <linux/can/raw.h>
55#include <net/sock.h>
56#include <net/net_namespace.h>
57
58#define CAN_RAW_VERSION CAN_VERSION
Andi Kleen6299b662012-10-04 17:12:08 -070059static __initconst const char banner[] =
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080060 KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
61
62MODULE_DESCRIPTION("PF_CAN raw protocol");
63MODULE_LICENSE("Dual BSD/GPL");
64MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
Lothar Waßmannb13bb2e2009-07-14 23:12:25 +000065MODULE_ALIAS("can-proto-1");
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080066
67#define MASK_ALL 0
68
69/*
70 * A raw socket has a list of can_filters attached to it, each receiving
71 * the CAN frames matching that filter. If the filter list is empty,
72 * no CAN frames will be received by the socket. The default after
73 * opening the socket, is to have one filter which receives all frames.
74 * The filter list is allocated dynamically with the exception of the
75 * list containing only one item. This common case is optimized by
76 * storing the single filter in dfilter, to avoid using dynamic memory.
77 */
78
79struct raw_sock {
80 struct sock sk;
81 int bound;
82 int ifindex;
83 struct notifier_block notifier;
84 int loopback;
85 int recv_own_msgs;
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +020086 int fd_frames;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080087 int count; /* number of active filters */
88 struct can_filter dfilter; /* default/single filter */
89 struct can_filter *filter; /* pointer to filter(s) */
90 can_err_mask_t err_mask;
91};
92
Oliver Hartkopp1e556592010-10-19 09:32:04 +000093/*
94 * Return pointer to store the extra msg flags for raw_recvmsg().
95 * We use the space of one unsigned int beyond the 'struct sockaddr_can'
96 * in skb->cb.
97 */
98static inline unsigned int *raw_flags(struct sk_buff *skb)
99{
100 BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) +
101 sizeof(unsigned int)));
102
103 /* return pointer after struct sockaddr_can */
104 return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
105}
106
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800107static inline struct raw_sock *raw_sk(const struct sock *sk)
108{
109 return (struct raw_sock *)sk;
110}
111
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000112static void raw_rcv(struct sk_buff *oskb, void *data)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800113{
114 struct sock *sk = (struct sock *)data;
115 struct raw_sock *ro = raw_sk(sk);
116 struct sockaddr_can *addr;
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000117 struct sk_buff *skb;
118 unsigned int *pflags;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800119
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800120 /* check the received tx sock reference */
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000121 if (!ro->recv_own_msgs && oskb->sk == sk)
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800122 return;
123
Oliver Hartkopp821047c2014-03-01 15:31:53 +0100124 /* do not pass non-CAN2.0 frames to a legacy socket */
125 if (!ro->fd_frames && oskb->len != CAN_MTU)
126 return;
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200127
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800128 /* clone the given skb to be able to enqueue it into the rcv queue */
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000129 skb = skb_clone(oskb, GFP_ATOMIC);
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800130 if (!skb)
131 return;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800132
133 /*
134 * Put the datagram to the queue so that raw_recvmsg() can
135 * get it from there. We need to pass the interface index to
136 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
137 * containing the interface index.
138 */
139
140 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
141 addr = (struct sockaddr_can *)skb->cb;
142 memset(addr, 0, sizeof(*addr));
143 addr->can_family = AF_CAN;
144 addr->can_ifindex = skb->dev->ifindex;
145
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000146 /* add CAN specific message flags for raw_recvmsg() */
147 pflags = raw_flags(skb);
148 *pflags = 0;
149 if (oskb->sk)
150 *pflags |= MSG_DONTROUTE;
151 if (oskb->sk == sk)
152 *pflags |= MSG_CONFIRM;
153
Urs Thuermanna2199942008-02-07 18:05:04 -0800154 if (sock_queue_rcv_skb(sk, skb) < 0)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800155 kfree_skb(skb);
156}
157
158static int raw_enable_filters(struct net_device *dev, struct sock *sk,
Urs Thuermanna2199942008-02-07 18:05:04 -0800159 struct can_filter *filter, int count)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800160{
161 int err = 0;
162 int i;
163
164 for (i = 0; i < count; i++) {
165 err = can_rx_register(dev, filter[i].can_id,
166 filter[i].can_mask,
167 raw_rcv, sk, "raw");
168 if (err) {
169 /* clean up successfully registered filters */
170 while (--i >= 0)
171 can_rx_unregister(dev, filter[i].can_id,
172 filter[i].can_mask,
173 raw_rcv, sk);
174 break;
175 }
176 }
177
178 return err;
179}
180
181static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
182 can_err_mask_t err_mask)
183{
184 int err = 0;
185
186 if (err_mask)
187 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
188 raw_rcv, sk, "raw");
189
190 return err;
191}
192
193static void raw_disable_filters(struct net_device *dev, struct sock *sk,
Urs Thuermanna2199942008-02-07 18:05:04 -0800194 struct can_filter *filter, int count)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800195{
196 int i;
197
198 for (i = 0; i < count; i++)
199 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
200 raw_rcv, sk);
201}
202
203static inline void raw_disable_errfilter(struct net_device *dev,
204 struct sock *sk,
205 can_err_mask_t err_mask)
206
207{
208 if (err_mask)
209 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
210 raw_rcv, sk);
211}
212
213static inline void raw_disable_allfilters(struct net_device *dev,
214 struct sock *sk)
215{
216 struct raw_sock *ro = raw_sk(sk);
217
218 raw_disable_filters(dev, sk, ro->filter, ro->count);
219 raw_disable_errfilter(dev, sk, ro->err_mask);
220}
221
222static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
223{
224 struct raw_sock *ro = raw_sk(sk);
225 int err;
226
227 err = raw_enable_filters(dev, sk, ro->filter, ro->count);
228 if (!err) {
229 err = raw_enable_errfilter(dev, sk, ro->err_mask);
230 if (err)
231 raw_disable_filters(dev, sk, ro->filter, ro->count);
232 }
233
234 return err;
235}
236
237static int raw_notifier(struct notifier_block *nb,
Jiri Pirko351638e2013-05-28 01:30:21 +0000238 unsigned long msg, void *ptr)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800239{
Jiri Pirko351638e2013-05-28 01:30:21 +0000240 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800241 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
242 struct sock *sk = &ro->sk;
243
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700244 if (!net_eq(dev_net(dev), &init_net))
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800245 return NOTIFY_DONE;
246
247 if (dev->type != ARPHRD_CAN)
248 return NOTIFY_DONE;
249
250 if (ro->ifindex != dev->ifindex)
251 return NOTIFY_DONE;
252
253 switch (msg) {
254
255 case NETDEV_UNREGISTER:
256 lock_sock(sk);
257 /* remove current filters & unregister */
258 if (ro->bound)
259 raw_disable_allfilters(dev, sk);
260
261 if (ro->count > 1)
262 kfree(ro->filter);
263
264 ro->ifindex = 0;
265 ro->bound = 0;
266 ro->count = 0;
267 release_sock(sk);
268
269 sk->sk_err = ENODEV;
270 if (!sock_flag(sk, SOCK_DEAD))
271 sk->sk_error_report(sk);
272 break;
273
274 case NETDEV_DOWN:
275 sk->sk_err = ENETDOWN;
276 if (!sock_flag(sk, SOCK_DEAD))
277 sk->sk_error_report(sk);
278 break;
279 }
280
281 return NOTIFY_DONE;
282}
283
284static int raw_init(struct sock *sk)
285{
286 struct raw_sock *ro = raw_sk(sk);
287
288 ro->bound = 0;
289 ro->ifindex = 0;
290
291 /* set default filter to single entry dfilter */
292 ro->dfilter.can_id = 0;
293 ro->dfilter.can_mask = MASK_ALL;
294 ro->filter = &ro->dfilter;
295 ro->count = 1;
296
297 /* set default loopback behaviour */
298 ro->loopback = 1;
299 ro->recv_own_msgs = 0;
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200300 ro->fd_frames = 0;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800301
302 /* set notifier */
303 ro->notifier.notifier_call = raw_notifier;
304
305 register_netdevice_notifier(&ro->notifier);
306
307 return 0;
308}
309
310static int raw_release(struct socket *sock)
311{
312 struct sock *sk = sock->sk;
Oliver Hartkopp10022a62011-04-20 01:57:15 +0000313 struct raw_sock *ro;
314
315 if (!sk)
316 return 0;
317
318 ro = raw_sk(sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800319
320 unregister_netdevice_notifier(&ro->notifier);
321
322 lock_sock(sk);
323
324 /* remove current filters & unregister */
325 if (ro->bound) {
326 if (ro->ifindex) {
327 struct net_device *dev;
328
329 dev = dev_get_by_index(&init_net, ro->ifindex);
330 if (dev) {
331 raw_disable_allfilters(dev, sk);
332 dev_put(dev);
333 }
334 } else
335 raw_disable_allfilters(NULL, sk);
336 }
337
338 if (ro->count > 1)
339 kfree(ro->filter);
340
341 ro->ifindex = 0;
342 ro->bound = 0;
343 ro->count = 0;
344
Lothar Waßmannf7e5cc02009-07-14 23:10:21 +0000345 sock_orphan(sk);
346 sock->sk = NULL;
347
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800348 release_sock(sk);
349 sock_put(sk);
350
351 return 0;
352}
353
354static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
355{
356 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
357 struct sock *sk = sock->sk;
358 struct raw_sock *ro = raw_sk(sk);
359 int ifindex;
360 int err = 0;
361 int notify_enetdown = 0;
362
363 if (len < sizeof(*addr))
364 return -EINVAL;
365
366 lock_sock(sk);
367
368 if (ro->bound && addr->can_ifindex == ro->ifindex)
369 goto out;
370
371 if (addr->can_ifindex) {
372 struct net_device *dev;
373
374 dev = dev_get_by_index(&init_net, addr->can_ifindex);
375 if (!dev) {
376 err = -ENODEV;
377 goto out;
378 }
379 if (dev->type != ARPHRD_CAN) {
380 dev_put(dev);
381 err = -ENODEV;
382 goto out;
383 }
384 if (!(dev->flags & IFF_UP))
385 notify_enetdown = 1;
386
387 ifindex = dev->ifindex;
388
389 /* filters set by default/setsockopt */
390 err = raw_enable_allfilters(dev, sk);
391 dev_put(dev);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800392 } else {
393 ifindex = 0;
394
395 /* filters set by default/setsockopt */
396 err = raw_enable_allfilters(NULL, sk);
397 }
398
399 if (!err) {
400 if (ro->bound) {
401 /* unregister old filters */
402 if (ro->ifindex) {
403 struct net_device *dev;
404
405 dev = dev_get_by_index(&init_net, ro->ifindex);
406 if (dev) {
407 raw_disable_allfilters(dev, sk);
408 dev_put(dev);
409 }
410 } else
411 raw_disable_allfilters(NULL, sk);
412 }
413 ro->ifindex = ifindex;
414 ro->bound = 1;
415 }
416
417 out:
418 release_sock(sk);
419
420 if (notify_enetdown) {
421 sk->sk_err = ENETDOWN;
422 if (!sock_flag(sk, SOCK_DEAD))
423 sk->sk_error_report(sk);
424 }
425
426 return err;
427}
428
429static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
430 int *len, int peer)
431{
432 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
433 struct sock *sk = sock->sk;
434 struct raw_sock *ro = raw_sk(sk);
435
436 if (peer)
437 return -EOPNOTSUPP;
438
Eric Dumazete84b90a2009-08-06 20:27:04 +0000439 memset(addr, 0, sizeof(*addr));
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800440 addr->can_family = AF_CAN;
441 addr->can_ifindex = ro->ifindex;
442
443 *len = sizeof(*addr);
444
445 return 0;
446}
447
448static int raw_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700449 char __user *optval, unsigned int optlen)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800450{
451 struct sock *sk = sock->sk;
452 struct raw_sock *ro = raw_sk(sk);
453 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
454 struct can_filter sfilter; /* single filter */
455 struct net_device *dev = NULL;
456 can_err_mask_t err_mask = 0;
457 int count = 0;
458 int err = 0;
459
460 if (level != SOL_CAN_RAW)
461 return -EINVAL;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800462
463 switch (optname) {
464
465 case CAN_RAW_FILTER:
466 if (optlen % sizeof(struct can_filter) != 0)
467 return -EINVAL;
468
469 count = optlen / sizeof(struct can_filter);
470
471 if (count > 1) {
472 /* filter does not fit into dfilter => alloc space */
Julia Lawall16dff912010-05-21 22:18:34 +0000473 filter = memdup_user(optval, optlen);
474 if (IS_ERR(filter))
475 return PTR_ERR(filter);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800476 } else if (count == 1) {
Eric Dumazet4ffa8702010-04-09 23:47:31 +0000477 if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700478 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800479 }
480
481 lock_sock(sk);
482
483 if (ro->bound && ro->ifindex)
484 dev = dev_get_by_index(&init_net, ro->ifindex);
485
486 if (ro->bound) {
487 /* (try to) register the new filters */
488 if (count == 1)
489 err = raw_enable_filters(dev, sk, &sfilter, 1);
490 else
491 err = raw_enable_filters(dev, sk, filter,
492 count);
493 if (err) {
494 if (count > 1)
495 kfree(filter);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800496 goto out_fil;
497 }
498
499 /* remove old filter registrations */
500 raw_disable_filters(dev, sk, ro->filter, ro->count);
501 }
502
503 /* remove old filter space */
504 if (ro->count > 1)
505 kfree(ro->filter);
506
507 /* link new filters to the socket */
508 if (count == 1) {
509 /* copy filter data for single filter */
510 ro->dfilter = sfilter;
511 filter = &ro->dfilter;
512 }
513 ro->filter = filter;
514 ro->count = count;
515
516 out_fil:
517 if (dev)
518 dev_put(dev);
519
520 release_sock(sk);
521
522 break;
523
524 case CAN_RAW_ERR_FILTER:
525 if (optlen != sizeof(err_mask))
526 return -EINVAL;
527
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700528 if (copy_from_user(&err_mask, optval, optlen))
529 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800530
531 err_mask &= CAN_ERR_MASK;
532
533 lock_sock(sk);
534
535 if (ro->bound && ro->ifindex)
536 dev = dev_get_by_index(&init_net, ro->ifindex);
537
538 /* remove current error mask */
539 if (ro->bound) {
540 /* (try to) register the new err_mask */
541 err = raw_enable_errfilter(dev, sk, err_mask);
542
543 if (err)
544 goto out_err;
545
546 /* remove old err_mask registration */
547 raw_disable_errfilter(dev, sk, ro->err_mask);
548 }
549
550 /* link new err_mask to the socket */
551 ro->err_mask = err_mask;
552
553 out_err:
554 if (dev)
555 dev_put(dev);
556
557 release_sock(sk);
558
559 break;
560
561 case CAN_RAW_LOOPBACK:
562 if (optlen != sizeof(ro->loopback))
563 return -EINVAL;
564
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700565 if (copy_from_user(&ro->loopback, optval, optlen))
566 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800567
568 break;
569
570 case CAN_RAW_RECV_OWN_MSGS:
571 if (optlen != sizeof(ro->recv_own_msgs))
572 return -EINVAL;
573
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700574 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
575 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800576
577 break;
578
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200579 case CAN_RAW_FD_FRAMES:
580 if (optlen != sizeof(ro->fd_frames))
581 return -EINVAL;
582
583 if (copy_from_user(&ro->fd_frames, optval, optlen))
584 return -EFAULT;
585
586 break;
587
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800588 default:
589 return -ENOPROTOOPT;
590 }
591 return err;
592}
593
594static int raw_getsockopt(struct socket *sock, int level, int optname,
595 char __user *optval, int __user *optlen)
596{
597 struct sock *sk = sock->sk;
598 struct raw_sock *ro = raw_sk(sk);
599 int len;
600 void *val;
601 int err = 0;
602
603 if (level != SOL_CAN_RAW)
604 return -EINVAL;
605 if (get_user(len, optlen))
606 return -EFAULT;
607 if (len < 0)
608 return -EINVAL;
609
610 switch (optname) {
611
612 case CAN_RAW_FILTER:
613 lock_sock(sk);
614 if (ro->count > 0) {
615 int fsize = ro->count * sizeof(struct can_filter);
616 if (len > fsize)
617 len = fsize;
Pavel Emelyanov653252c2008-04-25 01:49:48 -0700618 if (copy_to_user(optval, ro->filter, len))
619 err = -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800620 } else
621 len = 0;
622 release_sock(sk);
623
624 if (!err)
625 err = put_user(len, optlen);
626 return err;
627
628 case CAN_RAW_ERR_FILTER:
629 if (len > sizeof(can_err_mask_t))
630 len = sizeof(can_err_mask_t);
631 val = &ro->err_mask;
632 break;
633
634 case CAN_RAW_LOOPBACK:
635 if (len > sizeof(int))
636 len = sizeof(int);
637 val = &ro->loopback;
638 break;
639
640 case CAN_RAW_RECV_OWN_MSGS:
641 if (len > sizeof(int))
642 len = sizeof(int);
643 val = &ro->recv_own_msgs;
644 break;
645
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200646 case CAN_RAW_FD_FRAMES:
647 if (len > sizeof(int))
648 len = sizeof(int);
649 val = &ro->fd_frames;
650 break;
651
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800652 default:
653 return -ENOPROTOOPT;
654 }
655
656 if (put_user(len, optlen))
657 return -EFAULT;
658 if (copy_to_user(optval, val, len))
659 return -EFAULT;
660 return 0;
661}
662
663static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
664 struct msghdr *msg, size_t size)
665{
666 struct sock *sk = sock->sk;
667 struct raw_sock *ro = raw_sk(sk);
668 struct sk_buff *skb;
669 struct net_device *dev;
670 int ifindex;
671 int err;
672
673 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100674 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800675
Kurt Van Dijck5e507322011-01-15 20:56:42 -0800676 if (msg->msg_namelen < sizeof(*addr))
677 return -EINVAL;
678
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800679 if (addr->can_family != AF_CAN)
680 return -EINVAL;
681
682 ifindex = addr->can_ifindex;
683 } else
684 ifindex = ro->ifindex;
685
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200686 if (ro->fd_frames) {
687 if (unlikely(size != CANFD_MTU && size != CAN_MTU))
688 return -EINVAL;
689 } else {
690 if (unlikely(size != CAN_MTU))
691 return -EINVAL;
692 }
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700693
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800694 dev = dev_get_by_index(&init_net, ifindex);
695 if (!dev)
696 return -ENXIO;
697
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +0100698 skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
699 msg->msg_flags & MSG_DONTWAIT, &err);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800700 if (!skb)
701 goto put_dev;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800702
Oliver Hartkopp2bf34402013-01-28 08:33:33 +0000703 can_skb_reserve(skb);
704 can_skb_prv(skb)->ifindex = dev->ifindex;
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +0100705
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800706 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800707 if (err < 0)
708 goto free_skb;
Daniel Borkmannbf84a012013-04-14 08:08:13 +0000709
710 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
Oliver Hartkoppcff0d6e2010-08-03 00:31:48 -0700711
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800712 skb->dev = dev;
713 skb->sk = sk;
Rostislav Lisovybb5ecb02014-01-24 13:17:37 +0100714 skb->priority = sk->sk_priority;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800715
716 err = can_send(skb, ro->loopback);
717
718 dev_put(dev);
719
720 if (err)
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800721 goto send_failed;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800722
723 return size;
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800724
725free_skb:
726 kfree_skb(skb);
727put_dev:
728 dev_put(dev);
729send_failed:
730 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800731}
732
733static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
734 struct msghdr *msg, size_t size, int flags)
735{
736 struct sock *sk = sock->sk;
737 struct sk_buff *skb;
Urs Thuermanna2199942008-02-07 18:05:04 -0800738 int err = 0;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800739 int noblock;
740
741 noblock = flags & MSG_DONTWAIT;
742 flags &= ~MSG_DONTWAIT;
743
Urs Thuermanna2199942008-02-07 18:05:04 -0800744 skb = skb_recv_datagram(sk, flags, noblock, &err);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800745 if (!skb)
Urs Thuermanna2199942008-02-07 18:05:04 -0800746 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800747
Oliver Hartkopp821047c2014-03-01 15:31:53 +0100748 if (size < skb->len)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800749 msg->msg_flags |= MSG_TRUNC;
750 else
Oliver Hartkopp821047c2014-03-01 15:31:53 +0100751 size = skb->len;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800752
Urs Thuermanna2199942008-02-07 18:05:04 -0800753 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
754 if (err < 0) {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800755 skb_free_datagram(sk, skb);
Urs Thuermanna2199942008-02-07 18:05:04 -0800756 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800757 }
758
Neil Horman3b885782009-10-12 13:26:31 -0700759 sock_recv_ts_and_drops(msg, sk, skb);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800760
761 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100762 __sockaddr_check_size(sizeof(struct sockaddr_can));
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800763 msg->msg_namelen = sizeof(struct sockaddr_can);
764 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
765 }
766
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000767 /* assign the flags that have been recorded in raw_rcv() */
768 msg->msg_flags |= *(raw_flags(skb));
769
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800770 skb_free_datagram(sk, skb);
771
772 return size;
773}
774
Oliver Hartkopp53914b62011-03-22 08:27:25 +0000775static const struct proto_ops raw_ops = {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800776 .family = PF_CAN,
777 .release = raw_release,
778 .bind = raw_bind,
779 .connect = sock_no_connect,
780 .socketpair = sock_no_socketpair,
781 .accept = sock_no_accept,
782 .getname = raw_getname,
783 .poll = datagram_poll,
Oliver Hartkopp53914b62011-03-22 08:27:25 +0000784 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800785 .listen = sock_no_listen,
786 .shutdown = sock_no_shutdown,
787 .setsockopt = raw_setsockopt,
788 .getsockopt = raw_getsockopt,
789 .sendmsg = raw_sendmsg,
790 .recvmsg = raw_recvmsg,
791 .mmap = sock_no_mmap,
792 .sendpage = sock_no_sendpage,
793};
794
795static struct proto raw_proto __read_mostly = {
796 .name = "CAN_RAW",
797 .owner = THIS_MODULE,
798 .obj_size = sizeof(struct raw_sock),
799 .init = raw_init,
800};
801
Kurt Van Dijck16506292011-05-03 18:40:57 +0000802static const struct can_proto raw_can_proto = {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800803 .type = SOCK_RAW,
804 .protocol = CAN_RAW,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800805 .ops = &raw_ops,
806 .prot = &raw_proto,
807};
808
809static __init int raw_module_init(void)
810{
811 int err;
812
813 printk(banner);
814
815 err = can_proto_register(&raw_can_proto);
816 if (err < 0)
817 printk(KERN_ERR "can: registration of raw protocol failed\n");
818
819 return err;
820}
821
822static __exit void raw_module_exit(void)
823{
824 can_proto_unregister(&raw_can_proto);
825}
826
827module_init(raw_module_init);
828module_exit(raw_module_exit);