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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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090048#include <linux/slab.h>
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080049#include <linux/netdevice.h>
50#include <linux/socket.h>
51#include <linux/if_arp.h>
52#include <linux/skbuff.h>
53#include <linux/can.h>
54#include <linux/can/core.h>
55#include <linux/can/raw.h>
56#include <net/sock.h>
57#include <net/net_namespace.h>
58
59#define CAN_RAW_VERSION CAN_VERSION
60static __initdata const char banner[] =
61 KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
62
63MODULE_DESCRIPTION("PF_CAN raw protocol");
64MODULE_LICENSE("Dual BSD/GPL");
65MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
Lothar Waßmannb13bb2e2009-07-14 23:12:25 +000066MODULE_ALIAS("can-proto-1");
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080067
68#define MASK_ALL 0
69
70/*
71 * A raw socket has a list of can_filters attached to it, each receiving
72 * the CAN frames matching that filter. If the filter list is empty,
73 * no CAN frames will be received by the socket. The default after
74 * opening the socket, is to have one filter which receives all frames.
75 * The filter list is allocated dynamically with the exception of the
76 * list containing only one item. This common case is optimized by
77 * storing the single filter in dfilter, to avoid using dynamic memory.
78 */
79
80struct raw_sock {
81 struct sock sk;
82 int bound;
83 int ifindex;
84 struct notifier_block notifier;
85 int loopback;
86 int recv_own_msgs;
87 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
93static inline struct raw_sock *raw_sk(const struct sock *sk)
94{
95 return (struct raw_sock *)sk;
96}
97
98static void raw_rcv(struct sk_buff *skb, void *data)
99{
100 struct sock *sk = (struct sock *)data;
101 struct raw_sock *ro = raw_sk(sk);
102 struct sockaddr_can *addr;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800103
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800104 /* check the received tx sock reference */
105 if (!ro->recv_own_msgs && skb->sk == sk)
106 return;
107
108 /* clone the given skb to be able to enqueue it into the rcv queue */
109 skb = skb_clone(skb, GFP_ATOMIC);
110 if (!skb)
111 return;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800112
113 /*
114 * Put the datagram to the queue so that raw_recvmsg() can
115 * get it from there. We need to pass the interface index to
116 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
117 * containing the interface index.
118 */
119
120 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
121 addr = (struct sockaddr_can *)skb->cb;
122 memset(addr, 0, sizeof(*addr));
123 addr->can_family = AF_CAN;
124 addr->can_ifindex = skb->dev->ifindex;
125
Urs Thuermanna2199942008-02-07 18:05:04 -0800126 if (sock_queue_rcv_skb(sk, skb) < 0)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800127 kfree_skb(skb);
128}
129
130static int raw_enable_filters(struct net_device *dev, struct sock *sk,
Urs Thuermanna2199942008-02-07 18:05:04 -0800131 struct can_filter *filter, int count)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800132{
133 int err = 0;
134 int i;
135
136 for (i = 0; i < count; i++) {
137 err = can_rx_register(dev, filter[i].can_id,
138 filter[i].can_mask,
139 raw_rcv, sk, "raw");
140 if (err) {
141 /* clean up successfully registered filters */
142 while (--i >= 0)
143 can_rx_unregister(dev, filter[i].can_id,
144 filter[i].can_mask,
145 raw_rcv, sk);
146 break;
147 }
148 }
149
150 return err;
151}
152
153static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
154 can_err_mask_t err_mask)
155{
156 int err = 0;
157
158 if (err_mask)
159 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
160 raw_rcv, sk, "raw");
161
162 return err;
163}
164
165static void raw_disable_filters(struct net_device *dev, struct sock *sk,
Urs Thuermanna2199942008-02-07 18:05:04 -0800166 struct can_filter *filter, int count)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800167{
168 int i;
169
170 for (i = 0; i < count; i++)
171 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
172 raw_rcv, sk);
173}
174
175static inline void raw_disable_errfilter(struct net_device *dev,
176 struct sock *sk,
177 can_err_mask_t err_mask)
178
179{
180 if (err_mask)
181 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
182 raw_rcv, sk);
183}
184
185static inline void raw_disable_allfilters(struct net_device *dev,
186 struct sock *sk)
187{
188 struct raw_sock *ro = raw_sk(sk);
189
190 raw_disable_filters(dev, sk, ro->filter, ro->count);
191 raw_disable_errfilter(dev, sk, ro->err_mask);
192}
193
194static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
195{
196 struct raw_sock *ro = raw_sk(sk);
197 int err;
198
199 err = raw_enable_filters(dev, sk, ro->filter, ro->count);
200 if (!err) {
201 err = raw_enable_errfilter(dev, sk, ro->err_mask);
202 if (err)
203 raw_disable_filters(dev, sk, ro->filter, ro->count);
204 }
205
206 return err;
207}
208
209static int raw_notifier(struct notifier_block *nb,
210 unsigned long msg, void *data)
211{
212 struct net_device *dev = (struct net_device *)data;
213 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
214 struct sock *sk = &ro->sk;
215
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700216 if (!net_eq(dev_net(dev), &init_net))
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800217 return NOTIFY_DONE;
218
219 if (dev->type != ARPHRD_CAN)
220 return NOTIFY_DONE;
221
222 if (ro->ifindex != dev->ifindex)
223 return NOTIFY_DONE;
224
225 switch (msg) {
226
227 case NETDEV_UNREGISTER:
228 lock_sock(sk);
229 /* remove current filters & unregister */
230 if (ro->bound)
231 raw_disable_allfilters(dev, sk);
232
233 if (ro->count > 1)
234 kfree(ro->filter);
235
236 ro->ifindex = 0;
237 ro->bound = 0;
238 ro->count = 0;
239 release_sock(sk);
240
241 sk->sk_err = ENODEV;
242 if (!sock_flag(sk, SOCK_DEAD))
243 sk->sk_error_report(sk);
244 break;
245
246 case NETDEV_DOWN:
247 sk->sk_err = ENETDOWN;
248 if (!sock_flag(sk, SOCK_DEAD))
249 sk->sk_error_report(sk);
250 break;
251 }
252
253 return NOTIFY_DONE;
254}
255
256static int raw_init(struct sock *sk)
257{
258 struct raw_sock *ro = raw_sk(sk);
259
260 ro->bound = 0;
261 ro->ifindex = 0;
262
263 /* set default filter to single entry dfilter */
264 ro->dfilter.can_id = 0;
265 ro->dfilter.can_mask = MASK_ALL;
266 ro->filter = &ro->dfilter;
267 ro->count = 1;
268
269 /* set default loopback behaviour */
270 ro->loopback = 1;
271 ro->recv_own_msgs = 0;
272
273 /* set notifier */
274 ro->notifier.notifier_call = raw_notifier;
275
276 register_netdevice_notifier(&ro->notifier);
277
278 return 0;
279}
280
281static int raw_release(struct socket *sock)
282{
283 struct sock *sk = sock->sk;
284 struct raw_sock *ro = raw_sk(sk);
285
286 unregister_netdevice_notifier(&ro->notifier);
287
288 lock_sock(sk);
289
290 /* remove current filters & unregister */
291 if (ro->bound) {
292 if (ro->ifindex) {
293 struct net_device *dev;
294
295 dev = dev_get_by_index(&init_net, ro->ifindex);
296 if (dev) {
297 raw_disable_allfilters(dev, sk);
298 dev_put(dev);
299 }
300 } else
301 raw_disable_allfilters(NULL, sk);
302 }
303
304 if (ro->count > 1)
305 kfree(ro->filter);
306
307 ro->ifindex = 0;
308 ro->bound = 0;
309 ro->count = 0;
310
Lothar Waßmannf7e5cc02009-07-14 23:10:21 +0000311 sock_orphan(sk);
312 sock->sk = NULL;
313
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800314 release_sock(sk);
315 sock_put(sk);
316
317 return 0;
318}
319
320static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
321{
322 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
323 struct sock *sk = sock->sk;
324 struct raw_sock *ro = raw_sk(sk);
325 int ifindex;
326 int err = 0;
327 int notify_enetdown = 0;
328
329 if (len < sizeof(*addr))
330 return -EINVAL;
331
332 lock_sock(sk);
333
334 if (ro->bound && addr->can_ifindex == ro->ifindex)
335 goto out;
336
337 if (addr->can_ifindex) {
338 struct net_device *dev;
339
340 dev = dev_get_by_index(&init_net, addr->can_ifindex);
341 if (!dev) {
342 err = -ENODEV;
343 goto out;
344 }
345 if (dev->type != ARPHRD_CAN) {
346 dev_put(dev);
347 err = -ENODEV;
348 goto out;
349 }
350 if (!(dev->flags & IFF_UP))
351 notify_enetdown = 1;
352
353 ifindex = dev->ifindex;
354
355 /* filters set by default/setsockopt */
356 err = raw_enable_allfilters(dev, sk);
357 dev_put(dev);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800358 } else {
359 ifindex = 0;
360
361 /* filters set by default/setsockopt */
362 err = raw_enable_allfilters(NULL, sk);
363 }
364
365 if (!err) {
366 if (ro->bound) {
367 /* unregister old filters */
368 if (ro->ifindex) {
369 struct net_device *dev;
370
371 dev = dev_get_by_index(&init_net, ro->ifindex);
372 if (dev) {
373 raw_disable_allfilters(dev, sk);
374 dev_put(dev);
375 }
376 } else
377 raw_disable_allfilters(NULL, sk);
378 }
379 ro->ifindex = ifindex;
380 ro->bound = 1;
381 }
382
383 out:
384 release_sock(sk);
385
386 if (notify_enetdown) {
387 sk->sk_err = ENETDOWN;
388 if (!sock_flag(sk, SOCK_DEAD))
389 sk->sk_error_report(sk);
390 }
391
392 return err;
393}
394
395static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
396 int *len, int peer)
397{
398 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
399 struct sock *sk = sock->sk;
400 struct raw_sock *ro = raw_sk(sk);
401
402 if (peer)
403 return -EOPNOTSUPP;
404
Eric Dumazete84b90a2009-08-06 20:27:04 +0000405 memset(addr, 0, sizeof(*addr));
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800406 addr->can_family = AF_CAN;
407 addr->can_ifindex = ro->ifindex;
408
409 *len = sizeof(*addr);
410
411 return 0;
412}
413
414static int raw_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700415 char __user *optval, unsigned int optlen)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800416{
417 struct sock *sk = sock->sk;
418 struct raw_sock *ro = raw_sk(sk);
419 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
420 struct can_filter sfilter; /* single filter */
421 struct net_device *dev = NULL;
422 can_err_mask_t err_mask = 0;
423 int count = 0;
424 int err = 0;
425
426 if (level != SOL_CAN_RAW)
427 return -EINVAL;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800428
429 switch (optname) {
430
431 case CAN_RAW_FILTER:
432 if (optlen % sizeof(struct can_filter) != 0)
433 return -EINVAL;
434
435 count = optlen / sizeof(struct can_filter);
436
437 if (count > 1) {
438 /* filter does not fit into dfilter => alloc space */
439 filter = kmalloc(optlen, GFP_KERNEL);
440 if (!filter)
441 return -ENOMEM;
442
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700443 if (copy_from_user(filter, optval, optlen)) {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800444 kfree(filter);
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700445 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800446 }
447 } else if (count == 1) {
Eric Dumazet4ffa8702010-04-09 23:47:31 +0000448 if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700449 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800450 }
451
452 lock_sock(sk);
453
454 if (ro->bound && ro->ifindex)
455 dev = dev_get_by_index(&init_net, ro->ifindex);
456
457 if (ro->bound) {
458 /* (try to) register the new filters */
459 if (count == 1)
460 err = raw_enable_filters(dev, sk, &sfilter, 1);
461 else
462 err = raw_enable_filters(dev, sk, filter,
463 count);
464 if (err) {
465 if (count > 1)
466 kfree(filter);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800467 goto out_fil;
468 }
469
470 /* remove old filter registrations */
471 raw_disable_filters(dev, sk, ro->filter, ro->count);
472 }
473
474 /* remove old filter space */
475 if (ro->count > 1)
476 kfree(ro->filter);
477
478 /* link new filters to the socket */
479 if (count == 1) {
480 /* copy filter data for single filter */
481 ro->dfilter = sfilter;
482 filter = &ro->dfilter;
483 }
484 ro->filter = filter;
485 ro->count = count;
486
487 out_fil:
488 if (dev)
489 dev_put(dev);
490
491 release_sock(sk);
492
493 break;
494
495 case CAN_RAW_ERR_FILTER:
496 if (optlen != sizeof(err_mask))
497 return -EINVAL;
498
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700499 if (copy_from_user(&err_mask, optval, optlen))
500 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800501
502 err_mask &= CAN_ERR_MASK;
503
504 lock_sock(sk);
505
506 if (ro->bound && ro->ifindex)
507 dev = dev_get_by_index(&init_net, ro->ifindex);
508
509 /* remove current error mask */
510 if (ro->bound) {
511 /* (try to) register the new err_mask */
512 err = raw_enable_errfilter(dev, sk, err_mask);
513
514 if (err)
515 goto out_err;
516
517 /* remove old err_mask registration */
518 raw_disable_errfilter(dev, sk, ro->err_mask);
519 }
520
521 /* link new err_mask to the socket */
522 ro->err_mask = err_mask;
523
524 out_err:
525 if (dev)
526 dev_put(dev);
527
528 release_sock(sk);
529
530 break;
531
532 case CAN_RAW_LOOPBACK:
533 if (optlen != sizeof(ro->loopback))
534 return -EINVAL;
535
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700536 if (copy_from_user(&ro->loopback, optval, optlen))
537 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800538
539 break;
540
541 case CAN_RAW_RECV_OWN_MSGS:
542 if (optlen != sizeof(ro->recv_own_msgs))
543 return -EINVAL;
544
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700545 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
546 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800547
548 break;
549
550 default:
551 return -ENOPROTOOPT;
552 }
553 return err;
554}
555
556static int raw_getsockopt(struct socket *sock, int level, int optname,
557 char __user *optval, int __user *optlen)
558{
559 struct sock *sk = sock->sk;
560 struct raw_sock *ro = raw_sk(sk);
561 int len;
562 void *val;
563 int err = 0;
564
565 if (level != SOL_CAN_RAW)
566 return -EINVAL;
567 if (get_user(len, optlen))
568 return -EFAULT;
569 if (len < 0)
570 return -EINVAL;
571
572 switch (optname) {
573
574 case CAN_RAW_FILTER:
575 lock_sock(sk);
576 if (ro->count > 0) {
577 int fsize = ro->count * sizeof(struct can_filter);
578 if (len > fsize)
579 len = fsize;
Pavel Emelyanov653252c2008-04-25 01:49:48 -0700580 if (copy_to_user(optval, ro->filter, len))
581 err = -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800582 } else
583 len = 0;
584 release_sock(sk);
585
586 if (!err)
587 err = put_user(len, optlen);
588 return err;
589
590 case CAN_RAW_ERR_FILTER:
591 if (len > sizeof(can_err_mask_t))
592 len = sizeof(can_err_mask_t);
593 val = &ro->err_mask;
594 break;
595
596 case CAN_RAW_LOOPBACK:
597 if (len > sizeof(int))
598 len = sizeof(int);
599 val = &ro->loopback;
600 break;
601
602 case CAN_RAW_RECV_OWN_MSGS:
603 if (len > sizeof(int))
604 len = sizeof(int);
605 val = &ro->recv_own_msgs;
606 break;
607
608 default:
609 return -ENOPROTOOPT;
610 }
611
612 if (put_user(len, optlen))
613 return -EFAULT;
614 if (copy_to_user(optval, val, len))
615 return -EFAULT;
616 return 0;
617}
618
619static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
620 struct msghdr *msg, size_t size)
621{
622 struct sock *sk = sock->sk;
623 struct raw_sock *ro = raw_sk(sk);
624 struct sk_buff *skb;
625 struct net_device *dev;
626 int ifindex;
627 int err;
628
629 if (msg->msg_name) {
630 struct sockaddr_can *addr =
631 (struct sockaddr_can *)msg->msg_name;
632
633 if (addr->can_family != AF_CAN)
634 return -EINVAL;
635
636 ifindex = addr->can_ifindex;
637 } else
638 ifindex = ro->ifindex;
639
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700640 if (size != sizeof(struct can_frame))
641 return -EINVAL;
642
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800643 dev = dev_get_by_index(&init_net, ifindex);
644 if (!dev)
645 return -ENXIO;
646
647 skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
648 &err);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800649 if (!skb)
650 goto put_dev;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800651
652 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800653 if (err < 0)
654 goto free_skb;
Patrick Ohly51f31ca2009-02-12 05:03:39 +0000655 err = sock_tx_timestamp(msg, sk, skb_tx(skb));
656 if (err < 0)
657 goto free_skb;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800658 skb->dev = dev;
659 skb->sk = sk;
660
661 err = can_send(skb, ro->loopback);
662
663 dev_put(dev);
664
665 if (err)
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800666 goto send_failed;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800667
668 return size;
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800669
670free_skb:
671 kfree_skb(skb);
672put_dev:
673 dev_put(dev);
674send_failed:
675 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800676}
677
678static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
679 struct msghdr *msg, size_t size, int flags)
680{
681 struct sock *sk = sock->sk;
682 struct sk_buff *skb;
Urs Thuermanna2199942008-02-07 18:05:04 -0800683 int err = 0;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800684 int noblock;
685
686 noblock = flags & MSG_DONTWAIT;
687 flags &= ~MSG_DONTWAIT;
688
Urs Thuermanna2199942008-02-07 18:05:04 -0800689 skb = skb_recv_datagram(sk, flags, noblock, &err);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800690 if (!skb)
Urs Thuermanna2199942008-02-07 18:05:04 -0800691 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800692
693 if (size < skb->len)
694 msg->msg_flags |= MSG_TRUNC;
695 else
696 size = skb->len;
697
Urs Thuermanna2199942008-02-07 18:05:04 -0800698 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
699 if (err < 0) {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800700 skb_free_datagram(sk, skb);
Urs Thuermanna2199942008-02-07 18:05:04 -0800701 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800702 }
703
Neil Horman3b885782009-10-12 13:26:31 -0700704 sock_recv_ts_and_drops(msg, sk, skb);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800705
706 if (msg->msg_name) {
707 msg->msg_namelen = sizeof(struct sockaddr_can);
708 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
709 }
710
711 skb_free_datagram(sk, skb);
712
713 return size;
714}
715
716static struct proto_ops raw_ops __read_mostly = {
717 .family = PF_CAN,
718 .release = raw_release,
719 .bind = raw_bind,
720 .connect = sock_no_connect,
721 .socketpair = sock_no_socketpair,
722 .accept = sock_no_accept,
723 .getname = raw_getname,
724 .poll = datagram_poll,
725 .ioctl = NULL, /* use can_ioctl() from af_can.c */
726 .listen = sock_no_listen,
727 .shutdown = sock_no_shutdown,
728 .setsockopt = raw_setsockopt,
729 .getsockopt = raw_getsockopt,
730 .sendmsg = raw_sendmsg,
731 .recvmsg = raw_recvmsg,
732 .mmap = sock_no_mmap,
733 .sendpage = sock_no_sendpage,
734};
735
736static struct proto raw_proto __read_mostly = {
737 .name = "CAN_RAW",
738 .owner = THIS_MODULE,
739 .obj_size = sizeof(struct raw_sock),
740 .init = raw_init,
741};
742
743static struct can_proto raw_can_proto __read_mostly = {
744 .type = SOCK_RAW,
745 .protocol = CAN_RAW,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800746 .ops = &raw_ops,
747 .prot = &raw_proto,
748};
749
750static __init int raw_module_init(void)
751{
752 int err;
753
754 printk(banner);
755
756 err = can_proto_register(&raw_can_proto);
757 if (err < 0)
758 printk(KERN_ERR "can: registration of raw protocol failed\n");
759
760 return err;
761}
762
763static __exit void raw_module_exit(void)
764{
765 can_proto_unregister(&raw_can_proto);
766}
767
768module_init(raw_module_init);
769module_exit(raw_module_exit);