blob: db3152df7d2b627fd2484c14734e9a084d3e93a0 [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 *
40 * Send feedback to <socketcan-users@lists.berlios.de>
41 *
42 */
43
44#include <linux/module.h>
45#include <linux/init.h>
46#include <linux/uio.h>
47#include <linux/net.h>
48#include <linux/netdevice.h>
49#include <linux/socket.h>
50#include <linux/if_arp.h>
51#include <linux/skbuff.h>
52#include <linux/can.h>
53#include <linux/can/core.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
59static __initdata const char banner[] =
60 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;
86 int count; /* number of active filters */
87 struct can_filter dfilter; /* default/single filter */
88 struct can_filter *filter; /* pointer to filter(s) */
89 can_err_mask_t err_mask;
90};
91
92static inline struct raw_sock *raw_sk(const struct sock *sk)
93{
94 return (struct raw_sock *)sk;
95}
96
97static void raw_rcv(struct sk_buff *skb, void *data)
98{
99 struct sock *sk = (struct sock *)data;
100 struct raw_sock *ro = raw_sk(sk);
101 struct sockaddr_can *addr;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800102
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800103 /* check the received tx sock reference */
104 if (!ro->recv_own_msgs && skb->sk == sk)
105 return;
106
107 /* clone the given skb to be able to enqueue it into the rcv queue */
108 skb = skb_clone(skb, GFP_ATOMIC);
109 if (!skb)
110 return;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800111
112 /*
113 * Put the datagram to the queue so that raw_recvmsg() can
114 * get it from there. We need to pass the interface index to
115 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
116 * containing the interface index.
117 */
118
119 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
120 addr = (struct sockaddr_can *)skb->cb;
121 memset(addr, 0, sizeof(*addr));
122 addr->can_family = AF_CAN;
123 addr->can_ifindex = skb->dev->ifindex;
124
Urs Thuermanna2199942008-02-07 18:05:04 -0800125 if (sock_queue_rcv_skb(sk, skb) < 0)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800126 kfree_skb(skb);
127}
128
129static int raw_enable_filters(struct net_device *dev, struct sock *sk,
Urs Thuermanna2199942008-02-07 18:05:04 -0800130 struct can_filter *filter, int count)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800131{
132 int err = 0;
133 int i;
134
135 for (i = 0; i < count; i++) {
136 err = can_rx_register(dev, filter[i].can_id,
137 filter[i].can_mask,
138 raw_rcv, sk, "raw");
139 if (err) {
140 /* clean up successfully registered filters */
141 while (--i >= 0)
142 can_rx_unregister(dev, filter[i].can_id,
143 filter[i].can_mask,
144 raw_rcv, sk);
145 break;
146 }
147 }
148
149 return err;
150}
151
152static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
153 can_err_mask_t err_mask)
154{
155 int err = 0;
156
157 if (err_mask)
158 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
159 raw_rcv, sk, "raw");
160
161 return err;
162}
163
164static void raw_disable_filters(struct net_device *dev, struct sock *sk,
Urs Thuermanna2199942008-02-07 18:05:04 -0800165 struct can_filter *filter, int count)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800166{
167 int i;
168
169 for (i = 0; i < count; i++)
170 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
171 raw_rcv, sk);
172}
173
174static inline void raw_disable_errfilter(struct net_device *dev,
175 struct sock *sk,
176 can_err_mask_t err_mask)
177
178{
179 if (err_mask)
180 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
181 raw_rcv, sk);
182}
183
184static inline void raw_disable_allfilters(struct net_device *dev,
185 struct sock *sk)
186{
187 struct raw_sock *ro = raw_sk(sk);
188
189 raw_disable_filters(dev, sk, ro->filter, ro->count);
190 raw_disable_errfilter(dev, sk, ro->err_mask);
191}
192
193static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
194{
195 struct raw_sock *ro = raw_sk(sk);
196 int err;
197
198 err = raw_enable_filters(dev, sk, ro->filter, ro->count);
199 if (!err) {
200 err = raw_enable_errfilter(dev, sk, ro->err_mask);
201 if (err)
202 raw_disable_filters(dev, sk, ro->filter, ro->count);
203 }
204
205 return err;
206}
207
208static int raw_notifier(struct notifier_block *nb,
209 unsigned long msg, void *data)
210{
211 struct net_device *dev = (struct net_device *)data;
212 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
213 struct sock *sk = &ro->sk;
214
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700215 if (!net_eq(dev_net(dev), &init_net))
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800216 return NOTIFY_DONE;
217
218 if (dev->type != ARPHRD_CAN)
219 return NOTIFY_DONE;
220
221 if (ro->ifindex != dev->ifindex)
222 return NOTIFY_DONE;
223
224 switch (msg) {
225
226 case NETDEV_UNREGISTER:
227 lock_sock(sk);
228 /* remove current filters & unregister */
229 if (ro->bound)
230 raw_disable_allfilters(dev, sk);
231
232 if (ro->count > 1)
233 kfree(ro->filter);
234
235 ro->ifindex = 0;
236 ro->bound = 0;
237 ro->count = 0;
238 release_sock(sk);
239
240 sk->sk_err = ENODEV;
241 if (!sock_flag(sk, SOCK_DEAD))
242 sk->sk_error_report(sk);
243 break;
244
245 case NETDEV_DOWN:
246 sk->sk_err = ENETDOWN;
247 if (!sock_flag(sk, SOCK_DEAD))
248 sk->sk_error_report(sk);
249 break;
250 }
251
252 return NOTIFY_DONE;
253}
254
255static int raw_init(struct sock *sk)
256{
257 struct raw_sock *ro = raw_sk(sk);
258
259 ro->bound = 0;
260 ro->ifindex = 0;
261
262 /* set default filter to single entry dfilter */
263 ro->dfilter.can_id = 0;
264 ro->dfilter.can_mask = MASK_ALL;
265 ro->filter = &ro->dfilter;
266 ro->count = 1;
267
268 /* set default loopback behaviour */
269 ro->loopback = 1;
270 ro->recv_own_msgs = 0;
271
272 /* set notifier */
273 ro->notifier.notifier_call = raw_notifier;
274
275 register_netdevice_notifier(&ro->notifier);
276
277 return 0;
278}
279
280static int raw_release(struct socket *sock)
281{
282 struct sock *sk = sock->sk;
283 struct raw_sock *ro = raw_sk(sk);
284
285 unregister_netdevice_notifier(&ro->notifier);
286
287 lock_sock(sk);
288
289 /* remove current filters & unregister */
290 if (ro->bound) {
291 if (ro->ifindex) {
292 struct net_device *dev;
293
294 dev = dev_get_by_index(&init_net, ro->ifindex);
295 if (dev) {
296 raw_disable_allfilters(dev, sk);
297 dev_put(dev);
298 }
299 } else
300 raw_disable_allfilters(NULL, sk);
301 }
302
303 if (ro->count > 1)
304 kfree(ro->filter);
305
306 ro->ifindex = 0;
307 ro->bound = 0;
308 ro->count = 0;
309
Lothar Waßmannf7e5cc02009-07-14 23:10:21 +0000310 sock_orphan(sk);
311 sock->sk = NULL;
312
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800313 release_sock(sk);
314 sock_put(sk);
315
316 return 0;
317}
318
319static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
320{
321 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
322 struct sock *sk = sock->sk;
323 struct raw_sock *ro = raw_sk(sk);
324 int ifindex;
325 int err = 0;
326 int notify_enetdown = 0;
327
328 if (len < sizeof(*addr))
329 return -EINVAL;
330
331 lock_sock(sk);
332
333 if (ro->bound && addr->can_ifindex == ro->ifindex)
334 goto out;
335
336 if (addr->can_ifindex) {
337 struct net_device *dev;
338
339 dev = dev_get_by_index(&init_net, addr->can_ifindex);
340 if (!dev) {
341 err = -ENODEV;
342 goto out;
343 }
344 if (dev->type != ARPHRD_CAN) {
345 dev_put(dev);
346 err = -ENODEV;
347 goto out;
348 }
349 if (!(dev->flags & IFF_UP))
350 notify_enetdown = 1;
351
352 ifindex = dev->ifindex;
353
354 /* filters set by default/setsockopt */
355 err = raw_enable_allfilters(dev, sk);
356 dev_put(dev);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800357 } else {
358 ifindex = 0;
359
360 /* filters set by default/setsockopt */
361 err = raw_enable_allfilters(NULL, sk);
362 }
363
364 if (!err) {
365 if (ro->bound) {
366 /* unregister old filters */
367 if (ro->ifindex) {
368 struct net_device *dev;
369
370 dev = dev_get_by_index(&init_net, ro->ifindex);
371 if (dev) {
372 raw_disable_allfilters(dev, sk);
373 dev_put(dev);
374 }
375 } else
376 raw_disable_allfilters(NULL, sk);
377 }
378 ro->ifindex = ifindex;
379 ro->bound = 1;
380 }
381
382 out:
383 release_sock(sk);
384
385 if (notify_enetdown) {
386 sk->sk_err = ENETDOWN;
387 if (!sock_flag(sk, SOCK_DEAD))
388 sk->sk_error_report(sk);
389 }
390
391 return err;
392}
393
394static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
395 int *len, int peer)
396{
397 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
398 struct sock *sk = sock->sk;
399 struct raw_sock *ro = raw_sk(sk);
400
401 if (peer)
402 return -EOPNOTSUPP;
403
Eric Dumazete84b90a2009-08-06 20:27:04 +0000404 memset(addr, 0, sizeof(*addr));
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800405 addr->can_family = AF_CAN;
406 addr->can_ifindex = ro->ifindex;
407
408 *len = sizeof(*addr);
409
410 return 0;
411}
412
413static int raw_setsockopt(struct socket *sock, int level, int optname,
414 char __user *optval, int optlen)
415{
416 struct sock *sk = sock->sk;
417 struct raw_sock *ro = raw_sk(sk);
418 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
419 struct can_filter sfilter; /* single filter */
420 struct net_device *dev = NULL;
421 can_err_mask_t err_mask = 0;
422 int count = 0;
423 int err = 0;
424
425 if (level != SOL_CAN_RAW)
426 return -EINVAL;
427 if (optlen < 0)
428 return -EINVAL;
429
430 switch (optname) {
431
432 case CAN_RAW_FILTER:
433 if (optlen % sizeof(struct can_filter) != 0)
434 return -EINVAL;
435
436 count = optlen / sizeof(struct can_filter);
437
438 if (count > 1) {
439 /* filter does not fit into dfilter => alloc space */
440 filter = kmalloc(optlen, GFP_KERNEL);
441 if (!filter)
442 return -ENOMEM;
443
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700444 if (copy_from_user(filter, optval, optlen)) {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800445 kfree(filter);
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700446 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800447 }
448 } else if (count == 1) {
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700449 if (copy_from_user(&sfilter, optval, optlen))
450 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800451 }
452
453 lock_sock(sk);
454
455 if (ro->bound && ro->ifindex)
456 dev = dev_get_by_index(&init_net, ro->ifindex);
457
458 if (ro->bound) {
459 /* (try to) register the new filters */
460 if (count == 1)
461 err = raw_enable_filters(dev, sk, &sfilter, 1);
462 else
463 err = raw_enable_filters(dev, sk, filter,
464 count);
465 if (err) {
466 if (count > 1)
467 kfree(filter);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800468 goto out_fil;
469 }
470
471 /* remove old filter registrations */
472 raw_disable_filters(dev, sk, ro->filter, ro->count);
473 }
474
475 /* remove old filter space */
476 if (ro->count > 1)
477 kfree(ro->filter);
478
479 /* link new filters to the socket */
480 if (count == 1) {
481 /* copy filter data for single filter */
482 ro->dfilter = sfilter;
483 filter = &ro->dfilter;
484 }
485 ro->filter = filter;
486 ro->count = count;
487
488 out_fil:
489 if (dev)
490 dev_put(dev);
491
492 release_sock(sk);
493
494 break;
495
496 case CAN_RAW_ERR_FILTER:
497 if (optlen != sizeof(err_mask))
498 return -EINVAL;
499
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700500 if (copy_from_user(&err_mask, optval, optlen))
501 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800502
503 err_mask &= CAN_ERR_MASK;
504
505 lock_sock(sk);
506
507 if (ro->bound && ro->ifindex)
508 dev = dev_get_by_index(&init_net, ro->ifindex);
509
510 /* remove current error mask */
511 if (ro->bound) {
512 /* (try to) register the new err_mask */
513 err = raw_enable_errfilter(dev, sk, err_mask);
514
515 if (err)
516 goto out_err;
517
518 /* remove old err_mask registration */
519 raw_disable_errfilter(dev, sk, ro->err_mask);
520 }
521
522 /* link new err_mask to the socket */
523 ro->err_mask = err_mask;
524
525 out_err:
526 if (dev)
527 dev_put(dev);
528
529 release_sock(sk);
530
531 break;
532
533 case CAN_RAW_LOOPBACK:
534 if (optlen != sizeof(ro->loopback))
535 return -EINVAL;
536
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700537 if (copy_from_user(&ro->loopback, optval, optlen))
538 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800539
540 break;
541
542 case CAN_RAW_RECV_OWN_MSGS:
543 if (optlen != sizeof(ro->recv_own_msgs))
544 return -EINVAL;
545
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700546 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
547 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800548
549 break;
550
551 default:
552 return -ENOPROTOOPT;
553 }
554 return err;
555}
556
557static int raw_getsockopt(struct socket *sock, int level, int optname,
558 char __user *optval, int __user *optlen)
559{
560 struct sock *sk = sock->sk;
561 struct raw_sock *ro = raw_sk(sk);
562 int len;
563 void *val;
564 int err = 0;
565
566 if (level != SOL_CAN_RAW)
567 return -EINVAL;
568 if (get_user(len, optlen))
569 return -EFAULT;
570 if (len < 0)
571 return -EINVAL;
572
573 switch (optname) {
574
575 case CAN_RAW_FILTER:
576 lock_sock(sk);
577 if (ro->count > 0) {
578 int fsize = ro->count * sizeof(struct can_filter);
579 if (len > fsize)
580 len = fsize;
Pavel Emelyanov653252c2008-04-25 01:49:48 -0700581 if (copy_to_user(optval, ro->filter, len))
582 err = -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800583 } else
584 len = 0;
585 release_sock(sk);
586
587 if (!err)
588 err = put_user(len, optlen);
589 return err;
590
591 case CAN_RAW_ERR_FILTER:
592 if (len > sizeof(can_err_mask_t))
593 len = sizeof(can_err_mask_t);
594 val = &ro->err_mask;
595 break;
596
597 case CAN_RAW_LOOPBACK:
598 if (len > sizeof(int))
599 len = sizeof(int);
600 val = &ro->loopback;
601 break;
602
603 case CAN_RAW_RECV_OWN_MSGS:
604 if (len > sizeof(int))
605 len = sizeof(int);
606 val = &ro->recv_own_msgs;
607 break;
608
609 default:
610 return -ENOPROTOOPT;
611 }
612
613 if (put_user(len, optlen))
614 return -EFAULT;
615 if (copy_to_user(optval, val, len))
616 return -EFAULT;
617 return 0;
618}
619
620static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
621 struct msghdr *msg, size_t size)
622{
623 struct sock *sk = sock->sk;
624 struct raw_sock *ro = raw_sk(sk);
625 struct sk_buff *skb;
626 struct net_device *dev;
627 int ifindex;
628 int err;
629
630 if (msg->msg_name) {
631 struct sockaddr_can *addr =
632 (struct sockaddr_can *)msg->msg_name;
633
634 if (addr->can_family != AF_CAN)
635 return -EINVAL;
636
637 ifindex = addr->can_ifindex;
638 } else
639 ifindex = ro->ifindex;
640
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700641 if (size != sizeof(struct can_frame))
642 return -EINVAL;
643
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800644 dev = dev_get_by_index(&init_net, ifindex);
645 if (!dev)
646 return -ENXIO;
647
648 skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
649 &err);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800650 if (!skb)
651 goto put_dev;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800652
653 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800654 if (err < 0)
655 goto free_skb;
Patrick Ohly51f31ca2009-02-12 05:03:39 +0000656 err = sock_tx_timestamp(msg, sk, skb_tx(skb));
657 if (err < 0)
658 goto free_skb;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800659 skb->dev = dev;
660 skb->sk = sk;
661
662 err = can_send(skb, ro->loopback);
663
664 dev_put(dev);
665
666 if (err)
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800667 goto send_failed;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800668
669 return size;
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800670
671free_skb:
672 kfree_skb(skb);
673put_dev:
674 dev_put(dev);
675send_failed:
676 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800677}
678
679static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
680 struct msghdr *msg, size_t size, int flags)
681{
682 struct sock *sk = sock->sk;
683 struct sk_buff *skb;
Urs Thuermanna2199942008-02-07 18:05:04 -0800684 int err = 0;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800685 int noblock;
686
687 noblock = flags & MSG_DONTWAIT;
688 flags &= ~MSG_DONTWAIT;
689
Urs Thuermanna2199942008-02-07 18:05:04 -0800690 skb = skb_recv_datagram(sk, flags, noblock, &err);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800691 if (!skb)
Urs Thuermanna2199942008-02-07 18:05:04 -0800692 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800693
694 if (size < skb->len)
695 msg->msg_flags |= MSG_TRUNC;
696 else
697 size = skb->len;
698
Urs Thuermanna2199942008-02-07 18:05:04 -0800699 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
700 if (err < 0) {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800701 skb_free_datagram(sk, skb);
Urs Thuermanna2199942008-02-07 18:05:04 -0800702 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800703 }
704
705 sock_recv_timestamp(msg, sk, skb);
706
707 if (msg->msg_name) {
708 msg->msg_namelen = sizeof(struct sockaddr_can);
709 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
710 }
711
712 skb_free_datagram(sk, skb);
713
714 return size;
715}
716
717static struct proto_ops raw_ops __read_mostly = {
718 .family = PF_CAN,
719 .release = raw_release,
720 .bind = raw_bind,
721 .connect = sock_no_connect,
722 .socketpair = sock_no_socketpair,
723 .accept = sock_no_accept,
724 .getname = raw_getname,
725 .poll = datagram_poll,
726 .ioctl = NULL, /* use can_ioctl() from af_can.c */
727 .listen = sock_no_listen,
728 .shutdown = sock_no_shutdown,
729 .setsockopt = raw_setsockopt,
730 .getsockopt = raw_getsockopt,
731 .sendmsg = raw_sendmsg,
732 .recvmsg = raw_recvmsg,
733 .mmap = sock_no_mmap,
734 .sendpage = sock_no_sendpage,
735};
736
737static struct proto raw_proto __read_mostly = {
738 .name = "CAN_RAW",
739 .owner = THIS_MODULE,
740 .obj_size = sizeof(struct raw_sock),
741 .init = raw_init,
742};
743
744static struct can_proto raw_can_proto __read_mostly = {
745 .type = SOCK_RAW,
746 .protocol = CAN_RAW,
747 .capability = -1,
748 .ops = &raw_ops,
749 .prot = &raw_proto,
750};
751
752static __init int raw_module_init(void)
753{
754 int err;
755
756 printk(banner);
757
758 err = can_proto_register(&raw_can_proto);
759 if (err < 0)
760 printk(KERN_ERR "can: registration of raw protocol failed\n");
761
762 return err;
763}
764
765static __exit void raw_module_exit(void)
766{
767 can_proto_unregister(&raw_can_proto);
768}
769
770module_init(raw_module_init);
771module_exit(raw_module_exit);