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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 */
Julia Lawall16dff912010-05-21 22:18:34 +0000439 filter = memdup_user(optval, optlen);
440 if (IS_ERR(filter))
441 return PTR_ERR(filter);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800442 } else if (count == 1) {
Eric Dumazet4ffa8702010-04-09 23:47:31 +0000443 if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700444 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800445 }
446
447 lock_sock(sk);
448
449 if (ro->bound && ro->ifindex)
450 dev = dev_get_by_index(&init_net, ro->ifindex);
451
452 if (ro->bound) {
453 /* (try to) register the new filters */
454 if (count == 1)
455 err = raw_enable_filters(dev, sk, &sfilter, 1);
456 else
457 err = raw_enable_filters(dev, sk, filter,
458 count);
459 if (err) {
460 if (count > 1)
461 kfree(filter);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800462 goto out_fil;
463 }
464
465 /* remove old filter registrations */
466 raw_disable_filters(dev, sk, ro->filter, ro->count);
467 }
468
469 /* remove old filter space */
470 if (ro->count > 1)
471 kfree(ro->filter);
472
473 /* link new filters to the socket */
474 if (count == 1) {
475 /* copy filter data for single filter */
476 ro->dfilter = sfilter;
477 filter = &ro->dfilter;
478 }
479 ro->filter = filter;
480 ro->count = count;
481
482 out_fil:
483 if (dev)
484 dev_put(dev);
485
486 release_sock(sk);
487
488 break;
489
490 case CAN_RAW_ERR_FILTER:
491 if (optlen != sizeof(err_mask))
492 return -EINVAL;
493
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700494 if (copy_from_user(&err_mask, optval, optlen))
495 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800496
497 err_mask &= CAN_ERR_MASK;
498
499 lock_sock(sk);
500
501 if (ro->bound && ro->ifindex)
502 dev = dev_get_by_index(&init_net, ro->ifindex);
503
504 /* remove current error mask */
505 if (ro->bound) {
506 /* (try to) register the new err_mask */
507 err = raw_enable_errfilter(dev, sk, err_mask);
508
509 if (err)
510 goto out_err;
511
512 /* remove old err_mask registration */
513 raw_disable_errfilter(dev, sk, ro->err_mask);
514 }
515
516 /* link new err_mask to the socket */
517 ro->err_mask = err_mask;
518
519 out_err:
520 if (dev)
521 dev_put(dev);
522
523 release_sock(sk);
524
525 break;
526
527 case CAN_RAW_LOOPBACK:
528 if (optlen != sizeof(ro->loopback))
529 return -EINVAL;
530
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700531 if (copy_from_user(&ro->loopback, optval, optlen))
532 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800533
534 break;
535
536 case CAN_RAW_RECV_OWN_MSGS:
537 if (optlen != sizeof(ro->recv_own_msgs))
538 return -EINVAL;
539
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700540 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
541 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800542
543 break;
544
545 default:
546 return -ENOPROTOOPT;
547 }
548 return err;
549}
550
551static int raw_getsockopt(struct socket *sock, int level, int optname,
552 char __user *optval, int __user *optlen)
553{
554 struct sock *sk = sock->sk;
555 struct raw_sock *ro = raw_sk(sk);
556 int len;
557 void *val;
558 int err = 0;
559
560 if (level != SOL_CAN_RAW)
561 return -EINVAL;
562 if (get_user(len, optlen))
563 return -EFAULT;
564 if (len < 0)
565 return -EINVAL;
566
567 switch (optname) {
568
569 case CAN_RAW_FILTER:
570 lock_sock(sk);
571 if (ro->count > 0) {
572 int fsize = ro->count * sizeof(struct can_filter);
573 if (len > fsize)
574 len = fsize;
Pavel Emelyanov653252c2008-04-25 01:49:48 -0700575 if (copy_to_user(optval, ro->filter, len))
576 err = -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800577 } else
578 len = 0;
579 release_sock(sk);
580
581 if (!err)
582 err = put_user(len, optlen);
583 return err;
584
585 case CAN_RAW_ERR_FILTER:
586 if (len > sizeof(can_err_mask_t))
587 len = sizeof(can_err_mask_t);
588 val = &ro->err_mask;
589 break;
590
591 case CAN_RAW_LOOPBACK:
592 if (len > sizeof(int))
593 len = sizeof(int);
594 val = &ro->loopback;
595 break;
596
597 case CAN_RAW_RECV_OWN_MSGS:
598 if (len > sizeof(int))
599 len = sizeof(int);
600 val = &ro->recv_own_msgs;
601 break;
602
603 default:
604 return -ENOPROTOOPT;
605 }
606
607 if (put_user(len, optlen))
608 return -EFAULT;
609 if (copy_to_user(optval, val, len))
610 return -EFAULT;
611 return 0;
612}
613
614static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
615 struct msghdr *msg, size_t size)
616{
617 struct sock *sk = sock->sk;
618 struct raw_sock *ro = raw_sk(sk);
619 struct sk_buff *skb;
620 struct net_device *dev;
621 int ifindex;
622 int err;
623
624 if (msg->msg_name) {
625 struct sockaddr_can *addr =
626 (struct sockaddr_can *)msg->msg_name;
627
628 if (addr->can_family != AF_CAN)
629 return -EINVAL;
630
631 ifindex = addr->can_ifindex;
632 } else
633 ifindex = ro->ifindex;
634
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700635 if (size != sizeof(struct can_frame))
636 return -EINVAL;
637
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800638 dev = dev_get_by_index(&init_net, ifindex);
639 if (!dev)
640 return -ENXIO;
641
642 skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
643 &err);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800644 if (!skb)
645 goto put_dev;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800646
647 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800648 if (err < 0)
649 goto free_skb;
Patrick Ohly51f31ca2009-02-12 05:03:39 +0000650 err = sock_tx_timestamp(msg, sk, skb_tx(skb));
651 if (err < 0)
652 goto free_skb;
Oliver Hartkoppcff0d6e2010-08-03 00:31:48 -0700653
654 /* to be able to check the received tx sock reference in raw_rcv() */
655 skb_tx(skb)->prevent_sk_orphan = 1;
656
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800657 skb->dev = dev;
658 skb->sk = sk;
659
660 err = can_send(skb, ro->loopback);
661
662 dev_put(dev);
663
664 if (err)
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800665 goto send_failed;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800666
667 return size;
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800668
669free_skb:
670 kfree_skb(skb);
671put_dev:
672 dev_put(dev);
673send_failed:
674 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800675}
676
677static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
678 struct msghdr *msg, size_t size, int flags)
679{
680 struct sock *sk = sock->sk;
681 struct sk_buff *skb;
Urs Thuermanna2199942008-02-07 18:05:04 -0800682 int err = 0;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800683 int noblock;
684
685 noblock = flags & MSG_DONTWAIT;
686 flags &= ~MSG_DONTWAIT;
687
Urs Thuermanna2199942008-02-07 18:05:04 -0800688 skb = skb_recv_datagram(sk, flags, noblock, &err);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800689 if (!skb)
Urs Thuermanna2199942008-02-07 18:05:04 -0800690 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800691
692 if (size < skb->len)
693 msg->msg_flags |= MSG_TRUNC;
694 else
695 size = skb->len;
696
Urs Thuermanna2199942008-02-07 18:05:04 -0800697 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
698 if (err < 0) {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800699 skb_free_datagram(sk, skb);
Urs Thuermanna2199942008-02-07 18:05:04 -0800700 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800701 }
702
Neil Horman3b885782009-10-12 13:26:31 -0700703 sock_recv_ts_and_drops(msg, sk, skb);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800704
705 if (msg->msg_name) {
706 msg->msg_namelen = sizeof(struct sockaddr_can);
707 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
708 }
709
710 skb_free_datagram(sk, skb);
711
712 return size;
713}
714
715static struct proto_ops raw_ops __read_mostly = {
716 .family = PF_CAN,
717 .release = raw_release,
718 .bind = raw_bind,
719 .connect = sock_no_connect,
720 .socketpair = sock_no_socketpair,
721 .accept = sock_no_accept,
722 .getname = raw_getname,
723 .poll = datagram_poll,
724 .ioctl = NULL, /* use can_ioctl() from af_can.c */
725 .listen = sock_no_listen,
726 .shutdown = sock_no_shutdown,
727 .setsockopt = raw_setsockopt,
728 .getsockopt = raw_getsockopt,
729 .sendmsg = raw_sendmsg,
730 .recvmsg = raw_recvmsg,
731 .mmap = sock_no_mmap,
732 .sendpage = sock_no_sendpage,
733};
734
735static struct proto raw_proto __read_mostly = {
736 .name = "CAN_RAW",
737 .owner = THIS_MODULE,
738 .obj_size = sizeof(struct raw_sock),
739 .init = raw_init,
740};
741
742static struct can_proto raw_can_proto __read_mostly = {
743 .type = SOCK_RAW,
744 .protocol = CAN_RAW,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800745 .ops = &raw_ops,
746 .prot = &raw_proto,
747};
748
749static __init int raw_module_init(void)
750{
751 int err;
752
753 printk(banner);
754
755 err = can_proto_register(&raw_can_proto);
756 if (err < 0)
757 printk(KERN_ERR "can: registration of raw protocol failed\n");
758
759 return err;
760}
761
762static __exit void raw_module_exit(void)
763{
764 can_proto_unregister(&raw_can_proto);
765}
766
767module_init(raw_module_init);
768module_exit(raw_module_exit);