Commit | Line | Data |
---|---|---|
c18ce101 OH |
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 | * | |
c18ce101 OH |
40 | */ |
41 | ||
42 | #include <linux/module.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/uio.h> | |
45 | #include <linux/net.h> | |
5a0e3ad6 | 46 | #include <linux/slab.h> |
c18ce101 OH |
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/raw.h> | |
54 | #include <net/sock.h> | |
55 | #include <net/net_namespace.h> | |
56 | ||
57 | #define CAN_RAW_VERSION CAN_VERSION | |
58 | static __initdata const char banner[] = | |
59 | KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n"; | |
60 | ||
61 | MODULE_DESCRIPTION("PF_CAN raw protocol"); | |
62 | MODULE_LICENSE("Dual BSD/GPL"); | |
63 | MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>"); | |
b13bb2e9 | 64 | MODULE_ALIAS("can-proto-1"); |
c18ce101 OH |
65 | |
66 | #define MASK_ALL 0 | |
67 | ||
68 | /* | |
69 | * A raw socket has a list of can_filters attached to it, each receiving | |
70 | * the CAN frames matching that filter. If the filter list is empty, | |
71 | * no CAN frames will be received by the socket. The default after | |
72 | * opening the socket, is to have one filter which receives all frames. | |
73 | * The filter list is allocated dynamically with the exception of the | |
74 | * list containing only one item. This common case is optimized by | |
75 | * storing the single filter in dfilter, to avoid using dynamic memory. | |
76 | */ | |
77 | ||
78 | struct raw_sock { | |
79 | struct sock sk; | |
80 | int bound; | |
81 | int ifindex; | |
82 | struct notifier_block notifier; | |
83 | int loopback; | |
84 | int recv_own_msgs; | |
85 | int count; /* number of active filters */ | |
86 | struct can_filter dfilter; /* default/single filter */ | |
87 | struct can_filter *filter; /* pointer to filter(s) */ | |
88 | can_err_mask_t err_mask; | |
89 | }; | |
90 | ||
1e55659c OH |
91 | /* |
92 | * Return pointer to store the extra msg flags for raw_recvmsg(). | |
93 | * We use the space of one unsigned int beyond the 'struct sockaddr_can' | |
94 | * in skb->cb. | |
95 | */ | |
96 | static inline unsigned int *raw_flags(struct sk_buff *skb) | |
97 | { | |
98 | BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) + | |
99 | sizeof(unsigned int))); | |
100 | ||
101 | /* return pointer after struct sockaddr_can */ | |
102 | return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]); | |
103 | } | |
104 | ||
c18ce101 OH |
105 | static inline struct raw_sock *raw_sk(const struct sock *sk) |
106 | { | |
107 | return (struct raw_sock *)sk; | |
108 | } | |
109 | ||
1e55659c | 110 | static void raw_rcv(struct sk_buff *oskb, void *data) |
c18ce101 OH |
111 | { |
112 | struct sock *sk = (struct sock *)data; | |
113 | struct raw_sock *ro = raw_sk(sk); | |
114 | struct sockaddr_can *addr; | |
1e55659c OH |
115 | struct sk_buff *skb; |
116 | unsigned int *pflags; | |
c18ce101 | 117 | |
1fa17d4b | 118 | /* check the received tx sock reference */ |
1e55659c | 119 | if (!ro->recv_own_msgs && oskb->sk == sk) |
1fa17d4b OH |
120 | return; |
121 | ||
122 | /* clone the given skb to be able to enqueue it into the rcv queue */ | |
1e55659c | 123 | skb = skb_clone(oskb, GFP_ATOMIC); |
1fa17d4b OH |
124 | if (!skb) |
125 | return; | |
c18ce101 OH |
126 | |
127 | /* | |
128 | * Put the datagram to the queue so that raw_recvmsg() can | |
129 | * get it from there. We need to pass the interface index to | |
130 | * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
131 | * containing the interface index. | |
132 | */ | |
133 | ||
134 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
135 | addr = (struct sockaddr_can *)skb->cb; | |
136 | memset(addr, 0, sizeof(*addr)); | |
137 | addr->can_family = AF_CAN; | |
138 | addr->can_ifindex = skb->dev->ifindex; | |
139 | ||
1e55659c OH |
140 | /* add CAN specific message flags for raw_recvmsg() */ |
141 | pflags = raw_flags(skb); | |
142 | *pflags = 0; | |
143 | if (oskb->sk) | |
144 | *pflags |= MSG_DONTROUTE; | |
145 | if (oskb->sk == sk) | |
146 | *pflags |= MSG_CONFIRM; | |
147 | ||
a219994b | 148 | if (sock_queue_rcv_skb(sk, skb) < 0) |
c18ce101 OH |
149 | kfree_skb(skb); |
150 | } | |
151 | ||
152 | static int raw_enable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 153 | struct can_filter *filter, int count) |
c18ce101 OH |
154 | { |
155 | int err = 0; | |
156 | int i; | |
157 | ||
158 | for (i = 0; i < count; i++) { | |
159 | err = can_rx_register(dev, filter[i].can_id, | |
160 | filter[i].can_mask, | |
161 | raw_rcv, sk, "raw"); | |
162 | if (err) { | |
163 | /* clean up successfully registered filters */ | |
164 | while (--i >= 0) | |
165 | can_rx_unregister(dev, filter[i].can_id, | |
166 | filter[i].can_mask, | |
167 | raw_rcv, sk); | |
168 | break; | |
169 | } | |
170 | } | |
171 | ||
172 | return err; | |
173 | } | |
174 | ||
175 | static int raw_enable_errfilter(struct net_device *dev, struct sock *sk, | |
176 | can_err_mask_t err_mask) | |
177 | { | |
178 | int err = 0; | |
179 | ||
180 | if (err_mask) | |
181 | err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG, | |
182 | raw_rcv, sk, "raw"); | |
183 | ||
184 | return err; | |
185 | } | |
186 | ||
187 | static void raw_disable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 188 | struct can_filter *filter, int count) |
c18ce101 OH |
189 | { |
190 | int i; | |
191 | ||
192 | for (i = 0; i < count; i++) | |
193 | can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask, | |
194 | raw_rcv, sk); | |
195 | } | |
196 | ||
197 | static inline void raw_disable_errfilter(struct net_device *dev, | |
198 | struct sock *sk, | |
199 | can_err_mask_t err_mask) | |
200 | ||
201 | { | |
202 | if (err_mask) | |
203 | can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG, | |
204 | raw_rcv, sk); | |
205 | } | |
206 | ||
207 | static inline void raw_disable_allfilters(struct net_device *dev, | |
208 | struct sock *sk) | |
209 | { | |
210 | struct raw_sock *ro = raw_sk(sk); | |
211 | ||
212 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
213 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
214 | } | |
215 | ||
216 | static int raw_enable_allfilters(struct net_device *dev, struct sock *sk) | |
217 | { | |
218 | struct raw_sock *ro = raw_sk(sk); | |
219 | int err; | |
220 | ||
221 | err = raw_enable_filters(dev, sk, ro->filter, ro->count); | |
222 | if (!err) { | |
223 | err = raw_enable_errfilter(dev, sk, ro->err_mask); | |
224 | if (err) | |
225 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
226 | } | |
227 | ||
228 | return err; | |
229 | } | |
230 | ||
231 | static int raw_notifier(struct notifier_block *nb, | |
232 | unsigned long msg, void *data) | |
233 | { | |
234 | struct net_device *dev = (struct net_device *)data; | |
235 | struct raw_sock *ro = container_of(nb, struct raw_sock, notifier); | |
236 | struct sock *sk = &ro->sk; | |
237 | ||
721499e8 | 238 | if (!net_eq(dev_net(dev), &init_net)) |
c18ce101 OH |
239 | return NOTIFY_DONE; |
240 | ||
241 | if (dev->type != ARPHRD_CAN) | |
242 | return NOTIFY_DONE; | |
243 | ||
244 | if (ro->ifindex != dev->ifindex) | |
245 | return NOTIFY_DONE; | |
246 | ||
247 | switch (msg) { | |
248 | ||
249 | case NETDEV_UNREGISTER: | |
250 | lock_sock(sk); | |
251 | /* remove current filters & unregister */ | |
252 | if (ro->bound) | |
253 | raw_disable_allfilters(dev, sk); | |
254 | ||
255 | if (ro->count > 1) | |
256 | kfree(ro->filter); | |
257 | ||
258 | ro->ifindex = 0; | |
259 | ro->bound = 0; | |
260 | ro->count = 0; | |
261 | release_sock(sk); | |
262 | ||
263 | sk->sk_err = ENODEV; | |
264 | if (!sock_flag(sk, SOCK_DEAD)) | |
265 | sk->sk_error_report(sk); | |
266 | break; | |
267 | ||
268 | case NETDEV_DOWN: | |
269 | sk->sk_err = ENETDOWN; | |
270 | if (!sock_flag(sk, SOCK_DEAD)) | |
271 | sk->sk_error_report(sk); | |
272 | break; | |
273 | } | |
274 | ||
275 | return NOTIFY_DONE; | |
276 | } | |
277 | ||
278 | static int raw_init(struct sock *sk) | |
279 | { | |
280 | struct raw_sock *ro = raw_sk(sk); | |
281 | ||
282 | ro->bound = 0; | |
283 | ro->ifindex = 0; | |
284 | ||
285 | /* set default filter to single entry dfilter */ | |
286 | ro->dfilter.can_id = 0; | |
287 | ro->dfilter.can_mask = MASK_ALL; | |
288 | ro->filter = &ro->dfilter; | |
289 | ro->count = 1; | |
290 | ||
291 | /* set default loopback behaviour */ | |
292 | ro->loopback = 1; | |
293 | ro->recv_own_msgs = 0; | |
294 | ||
295 | /* set notifier */ | |
296 | ro->notifier.notifier_call = raw_notifier; | |
297 | ||
298 | register_netdevice_notifier(&ro->notifier); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static int raw_release(struct socket *sock) | |
304 | { | |
305 | struct sock *sk = sock->sk; | |
10022a6c OH |
306 | struct raw_sock *ro; |
307 | ||
308 | if (!sk) | |
309 | return 0; | |
310 | ||
311 | ro = raw_sk(sk); | |
c18ce101 OH |
312 | |
313 | unregister_netdevice_notifier(&ro->notifier); | |
314 | ||
315 | lock_sock(sk); | |
316 | ||
317 | /* remove current filters & unregister */ | |
318 | if (ro->bound) { | |
319 | if (ro->ifindex) { | |
320 | struct net_device *dev; | |
321 | ||
322 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
323 | if (dev) { | |
324 | raw_disable_allfilters(dev, sk); | |
325 | dev_put(dev); | |
326 | } | |
327 | } else | |
328 | raw_disable_allfilters(NULL, sk); | |
329 | } | |
330 | ||
331 | if (ro->count > 1) | |
332 | kfree(ro->filter); | |
333 | ||
334 | ro->ifindex = 0; | |
335 | ro->bound = 0; | |
336 | ro->count = 0; | |
337 | ||
f7e5cc0c LW |
338 | sock_orphan(sk); |
339 | sock->sk = NULL; | |
340 | ||
c18ce101 OH |
341 | release_sock(sk); |
342 | sock_put(sk); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len) | |
348 | { | |
349 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
350 | struct sock *sk = sock->sk; | |
351 | struct raw_sock *ro = raw_sk(sk); | |
352 | int ifindex; | |
353 | int err = 0; | |
354 | int notify_enetdown = 0; | |
355 | ||
356 | if (len < sizeof(*addr)) | |
357 | return -EINVAL; | |
358 | ||
359 | lock_sock(sk); | |
360 | ||
361 | if (ro->bound && addr->can_ifindex == ro->ifindex) | |
362 | goto out; | |
363 | ||
364 | if (addr->can_ifindex) { | |
365 | struct net_device *dev; | |
366 | ||
367 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
368 | if (!dev) { | |
369 | err = -ENODEV; | |
370 | goto out; | |
371 | } | |
372 | if (dev->type != ARPHRD_CAN) { | |
373 | dev_put(dev); | |
374 | err = -ENODEV; | |
375 | goto out; | |
376 | } | |
377 | if (!(dev->flags & IFF_UP)) | |
378 | notify_enetdown = 1; | |
379 | ||
380 | ifindex = dev->ifindex; | |
381 | ||
382 | /* filters set by default/setsockopt */ | |
383 | err = raw_enable_allfilters(dev, sk); | |
384 | dev_put(dev); | |
c18ce101 OH |
385 | } else { |
386 | ifindex = 0; | |
387 | ||
388 | /* filters set by default/setsockopt */ | |
389 | err = raw_enable_allfilters(NULL, sk); | |
390 | } | |
391 | ||
392 | if (!err) { | |
393 | if (ro->bound) { | |
394 | /* unregister old filters */ | |
395 | if (ro->ifindex) { | |
396 | struct net_device *dev; | |
397 | ||
398 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
399 | if (dev) { | |
400 | raw_disable_allfilters(dev, sk); | |
401 | dev_put(dev); | |
402 | } | |
403 | } else | |
404 | raw_disable_allfilters(NULL, sk); | |
405 | } | |
406 | ro->ifindex = ifindex; | |
407 | ro->bound = 1; | |
408 | } | |
409 | ||
410 | out: | |
411 | release_sock(sk); | |
412 | ||
413 | if (notify_enetdown) { | |
414 | sk->sk_err = ENETDOWN; | |
415 | if (!sock_flag(sk, SOCK_DEAD)) | |
416 | sk->sk_error_report(sk); | |
417 | } | |
418 | ||
419 | return err; | |
420 | } | |
421 | ||
422 | static int raw_getname(struct socket *sock, struct sockaddr *uaddr, | |
423 | int *len, int peer) | |
424 | { | |
425 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
426 | struct sock *sk = sock->sk; | |
427 | struct raw_sock *ro = raw_sk(sk); | |
428 | ||
429 | if (peer) | |
430 | return -EOPNOTSUPP; | |
431 | ||
e84b90ae | 432 | memset(addr, 0, sizeof(*addr)); |
c18ce101 OH |
433 | addr->can_family = AF_CAN; |
434 | addr->can_ifindex = ro->ifindex; | |
435 | ||
436 | *len = sizeof(*addr); | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
441 | static int raw_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 442 | char __user *optval, unsigned int optlen) |
c18ce101 OH |
443 | { |
444 | struct sock *sk = sock->sk; | |
445 | struct raw_sock *ro = raw_sk(sk); | |
446 | struct can_filter *filter = NULL; /* dyn. alloc'ed filters */ | |
447 | struct can_filter sfilter; /* single filter */ | |
448 | struct net_device *dev = NULL; | |
449 | can_err_mask_t err_mask = 0; | |
450 | int count = 0; | |
451 | int err = 0; | |
452 | ||
453 | if (level != SOL_CAN_RAW) | |
454 | return -EINVAL; | |
c18ce101 OH |
455 | |
456 | switch (optname) { | |
457 | ||
458 | case CAN_RAW_FILTER: | |
459 | if (optlen % sizeof(struct can_filter) != 0) | |
460 | return -EINVAL; | |
461 | ||
462 | count = optlen / sizeof(struct can_filter); | |
463 | ||
464 | if (count > 1) { | |
465 | /* filter does not fit into dfilter => alloc space */ | |
16dff918 JL |
466 | filter = memdup_user(optval, optlen); |
467 | if (IS_ERR(filter)) | |
468 | return PTR_ERR(filter); | |
c18ce101 | 469 | } else if (count == 1) { |
4ffa8701 | 470 | if (copy_from_user(&sfilter, optval, sizeof(sfilter))) |
3f91bd42 | 471 | return -EFAULT; |
c18ce101 OH |
472 | } |
473 | ||
474 | lock_sock(sk); | |
475 | ||
476 | if (ro->bound && ro->ifindex) | |
477 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
478 | ||
479 | if (ro->bound) { | |
480 | /* (try to) register the new filters */ | |
481 | if (count == 1) | |
482 | err = raw_enable_filters(dev, sk, &sfilter, 1); | |
483 | else | |
484 | err = raw_enable_filters(dev, sk, filter, | |
485 | count); | |
486 | if (err) { | |
487 | if (count > 1) | |
488 | kfree(filter); | |
c18ce101 OH |
489 | goto out_fil; |
490 | } | |
491 | ||
492 | /* remove old filter registrations */ | |
493 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
494 | } | |
495 | ||
496 | /* remove old filter space */ | |
497 | if (ro->count > 1) | |
498 | kfree(ro->filter); | |
499 | ||
500 | /* link new filters to the socket */ | |
501 | if (count == 1) { | |
502 | /* copy filter data for single filter */ | |
503 | ro->dfilter = sfilter; | |
504 | filter = &ro->dfilter; | |
505 | } | |
506 | ro->filter = filter; | |
507 | ro->count = count; | |
508 | ||
509 | out_fil: | |
510 | if (dev) | |
511 | dev_put(dev); | |
512 | ||
513 | release_sock(sk); | |
514 | ||
515 | break; | |
516 | ||
517 | case CAN_RAW_ERR_FILTER: | |
518 | if (optlen != sizeof(err_mask)) | |
519 | return -EINVAL; | |
520 | ||
3f91bd42 SR |
521 | if (copy_from_user(&err_mask, optval, optlen)) |
522 | return -EFAULT; | |
c18ce101 OH |
523 | |
524 | err_mask &= CAN_ERR_MASK; | |
525 | ||
526 | lock_sock(sk); | |
527 | ||
528 | if (ro->bound && ro->ifindex) | |
529 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
530 | ||
531 | /* remove current error mask */ | |
532 | if (ro->bound) { | |
533 | /* (try to) register the new err_mask */ | |
534 | err = raw_enable_errfilter(dev, sk, err_mask); | |
535 | ||
536 | if (err) | |
537 | goto out_err; | |
538 | ||
539 | /* remove old err_mask registration */ | |
540 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
541 | } | |
542 | ||
543 | /* link new err_mask to the socket */ | |
544 | ro->err_mask = err_mask; | |
545 | ||
546 | out_err: | |
547 | if (dev) | |
548 | dev_put(dev); | |
549 | ||
550 | release_sock(sk); | |
551 | ||
552 | break; | |
553 | ||
554 | case CAN_RAW_LOOPBACK: | |
555 | if (optlen != sizeof(ro->loopback)) | |
556 | return -EINVAL; | |
557 | ||
3f91bd42 SR |
558 | if (copy_from_user(&ro->loopback, optval, optlen)) |
559 | return -EFAULT; | |
c18ce101 OH |
560 | |
561 | break; | |
562 | ||
563 | case CAN_RAW_RECV_OWN_MSGS: | |
564 | if (optlen != sizeof(ro->recv_own_msgs)) | |
565 | return -EINVAL; | |
566 | ||
3f91bd42 SR |
567 | if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) |
568 | return -EFAULT; | |
c18ce101 OH |
569 | |
570 | break; | |
571 | ||
572 | default: | |
573 | return -ENOPROTOOPT; | |
574 | } | |
575 | return err; | |
576 | } | |
577 | ||
578 | static int raw_getsockopt(struct socket *sock, int level, int optname, | |
579 | char __user *optval, int __user *optlen) | |
580 | { | |
581 | struct sock *sk = sock->sk; | |
582 | struct raw_sock *ro = raw_sk(sk); | |
583 | int len; | |
584 | void *val; | |
585 | int err = 0; | |
586 | ||
587 | if (level != SOL_CAN_RAW) | |
588 | return -EINVAL; | |
589 | if (get_user(len, optlen)) | |
590 | return -EFAULT; | |
591 | if (len < 0) | |
592 | return -EINVAL; | |
593 | ||
594 | switch (optname) { | |
595 | ||
596 | case CAN_RAW_FILTER: | |
597 | lock_sock(sk); | |
598 | if (ro->count > 0) { | |
599 | int fsize = ro->count * sizeof(struct can_filter); | |
600 | if (len > fsize) | |
601 | len = fsize; | |
653252c2 PE |
602 | if (copy_to_user(optval, ro->filter, len)) |
603 | err = -EFAULT; | |
c18ce101 OH |
604 | } else |
605 | len = 0; | |
606 | release_sock(sk); | |
607 | ||
608 | if (!err) | |
609 | err = put_user(len, optlen); | |
610 | return err; | |
611 | ||
612 | case CAN_RAW_ERR_FILTER: | |
613 | if (len > sizeof(can_err_mask_t)) | |
614 | len = sizeof(can_err_mask_t); | |
615 | val = &ro->err_mask; | |
616 | break; | |
617 | ||
618 | case CAN_RAW_LOOPBACK: | |
619 | if (len > sizeof(int)) | |
620 | len = sizeof(int); | |
621 | val = &ro->loopback; | |
622 | break; | |
623 | ||
624 | case CAN_RAW_RECV_OWN_MSGS: | |
625 | if (len > sizeof(int)) | |
626 | len = sizeof(int); | |
627 | val = &ro->recv_own_msgs; | |
628 | break; | |
629 | ||
630 | default: | |
631 | return -ENOPROTOOPT; | |
632 | } | |
633 | ||
634 | if (put_user(len, optlen)) | |
635 | return -EFAULT; | |
636 | if (copy_to_user(optval, val, len)) | |
637 | return -EFAULT; | |
638 | return 0; | |
639 | } | |
640 | ||
641 | static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, | |
642 | struct msghdr *msg, size_t size) | |
643 | { | |
644 | struct sock *sk = sock->sk; | |
645 | struct raw_sock *ro = raw_sk(sk); | |
646 | struct sk_buff *skb; | |
647 | struct net_device *dev; | |
648 | int ifindex; | |
649 | int err; | |
650 | ||
651 | if (msg->msg_name) { | |
652 | struct sockaddr_can *addr = | |
653 | (struct sockaddr_can *)msg->msg_name; | |
654 | ||
5e507328 KVD |
655 | if (msg->msg_namelen < sizeof(*addr)) |
656 | return -EINVAL; | |
657 | ||
c18ce101 OH |
658 | if (addr->can_family != AF_CAN) |
659 | return -EINVAL; | |
660 | ||
661 | ifindex = addr->can_ifindex; | |
662 | } else | |
663 | ifindex = ro->ifindex; | |
664 | ||
7f2d38eb OH |
665 | if (size != sizeof(struct can_frame)) |
666 | return -EINVAL; | |
667 | ||
c18ce101 OH |
668 | dev = dev_get_by_index(&init_net, ifindex); |
669 | if (!dev) | |
670 | return -ENXIO; | |
671 | ||
672 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, | |
673 | &err); | |
ebad5c09 IJ |
674 | if (!skb) |
675 | goto put_dev; | |
c18ce101 OH |
676 | |
677 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
51f31cab PO |
678 | if (err < 0) |
679 | goto free_skb; | |
2244d07b | 680 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ebad5c09 IJ |
681 | if (err < 0) |
682 | goto free_skb; | |
cff0d6e6 | 683 | |
c18ce101 OH |
684 | skb->dev = dev; |
685 | skb->sk = sk; | |
686 | ||
687 | err = can_send(skb, ro->loopback); | |
688 | ||
689 | dev_put(dev); | |
690 | ||
691 | if (err) | |
ebad5c09 | 692 | goto send_failed; |
c18ce101 OH |
693 | |
694 | return size; | |
ebad5c09 IJ |
695 | |
696 | free_skb: | |
697 | kfree_skb(skb); | |
698 | put_dev: | |
699 | dev_put(dev); | |
700 | send_failed: | |
701 | return err; | |
c18ce101 OH |
702 | } |
703 | ||
704 | static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, | |
705 | struct msghdr *msg, size_t size, int flags) | |
706 | { | |
707 | struct sock *sk = sock->sk; | |
708 | struct sk_buff *skb; | |
a219994b | 709 | int err = 0; |
c18ce101 OH |
710 | int noblock; |
711 | ||
712 | noblock = flags & MSG_DONTWAIT; | |
713 | flags &= ~MSG_DONTWAIT; | |
714 | ||
a219994b | 715 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
c18ce101 | 716 | if (!skb) |
a219994b | 717 | return err; |
c18ce101 OH |
718 | |
719 | if (size < skb->len) | |
720 | msg->msg_flags |= MSG_TRUNC; | |
721 | else | |
722 | size = skb->len; | |
723 | ||
a219994b UT |
724 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); |
725 | if (err < 0) { | |
c18ce101 | 726 | skb_free_datagram(sk, skb); |
a219994b | 727 | return err; |
c18ce101 OH |
728 | } |
729 | ||
3b885787 | 730 | sock_recv_ts_and_drops(msg, sk, skb); |
c18ce101 OH |
731 | |
732 | if (msg->msg_name) { | |
733 | msg->msg_namelen = sizeof(struct sockaddr_can); | |
734 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
735 | } | |
736 | ||
1e55659c OH |
737 | /* assign the flags that have been recorded in raw_rcv() */ |
738 | msg->msg_flags |= *(raw_flags(skb)); | |
739 | ||
c18ce101 OH |
740 | skb_free_datagram(sk, skb); |
741 | ||
742 | return size; | |
743 | } | |
744 | ||
53914b67 | 745 | static const struct proto_ops raw_ops = { |
c18ce101 OH |
746 | .family = PF_CAN, |
747 | .release = raw_release, | |
748 | .bind = raw_bind, | |
749 | .connect = sock_no_connect, | |
750 | .socketpair = sock_no_socketpair, | |
751 | .accept = sock_no_accept, | |
752 | .getname = raw_getname, | |
753 | .poll = datagram_poll, | |
53914b67 | 754 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
c18ce101 OH |
755 | .listen = sock_no_listen, |
756 | .shutdown = sock_no_shutdown, | |
757 | .setsockopt = raw_setsockopt, | |
758 | .getsockopt = raw_getsockopt, | |
759 | .sendmsg = raw_sendmsg, | |
760 | .recvmsg = raw_recvmsg, | |
761 | .mmap = sock_no_mmap, | |
762 | .sendpage = sock_no_sendpage, | |
763 | }; | |
764 | ||
765 | static struct proto raw_proto __read_mostly = { | |
766 | .name = "CAN_RAW", | |
767 | .owner = THIS_MODULE, | |
768 | .obj_size = sizeof(struct raw_sock), | |
769 | .init = raw_init, | |
770 | }; | |
771 | ||
1650629d | 772 | static const struct can_proto raw_can_proto = { |
c18ce101 OH |
773 | .type = SOCK_RAW, |
774 | .protocol = CAN_RAW, | |
c18ce101 OH |
775 | .ops = &raw_ops, |
776 | .prot = &raw_proto, | |
777 | }; | |
778 | ||
779 | static __init int raw_module_init(void) | |
780 | { | |
781 | int err; | |
782 | ||
783 | printk(banner); | |
784 | ||
785 | err = can_proto_register(&raw_can_proto); | |
786 | if (err < 0) | |
787 | printk(KERN_ERR "can: registration of raw protocol failed\n"); | |
788 | ||
789 | return err; | |
790 | } | |
791 | ||
792 | static __exit void raw_module_exit(void) | |
793 | { | |
794 | can_proto_unregister(&raw_can_proto); | |
795 | } | |
796 | ||
797 | module_init(raw_module_init); | |
798 | module_exit(raw_module_exit); |