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Commit | Line | Data |
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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 | * | |
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> | |
5a0e3ad6 | 48 | #include <linux/slab.h> |
c18ce101 OH |
49 | #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 | |
60 | static __initdata const char banner[] = | |
61 | KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n"; | |
62 | ||
63 | MODULE_DESCRIPTION("PF_CAN raw protocol"); | |
64 | MODULE_LICENSE("Dual BSD/GPL"); | |
65 | MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>"); | |
b13bb2e9 | 66 | MODULE_ALIAS("can-proto-1"); |
c18ce101 OH |
67 | |
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 | ||
80 | struct 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 | ||
1e55659c OH |
93 | /* |
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 | */ | |
98 | static 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 | ||
c18ce101 OH |
107 | static inline struct raw_sock *raw_sk(const struct sock *sk) |
108 | { | |
109 | return (struct raw_sock *)sk; | |
110 | } | |
111 | ||
1e55659c | 112 | static void raw_rcv(struct sk_buff *oskb, void *data) |
c18ce101 OH |
113 | { |
114 | struct sock *sk = (struct sock *)data; | |
115 | struct raw_sock *ro = raw_sk(sk); | |
116 | struct sockaddr_can *addr; | |
1e55659c OH |
117 | struct sk_buff *skb; |
118 | unsigned int *pflags; | |
c18ce101 | 119 | |
1fa17d4b | 120 | /* check the received tx sock reference */ |
1e55659c | 121 | if (!ro->recv_own_msgs && oskb->sk == sk) |
1fa17d4b OH |
122 | return; |
123 | ||
124 | /* clone the given skb to be able to enqueue it into the rcv queue */ | |
1e55659c | 125 | skb = skb_clone(oskb, GFP_ATOMIC); |
1fa17d4b OH |
126 | if (!skb) |
127 | return; | |
c18ce101 OH |
128 | |
129 | /* | |
130 | * Put the datagram to the queue so that raw_recvmsg() can | |
131 | * get it from there. We need to pass the interface index to | |
132 | * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
133 | * containing the interface index. | |
134 | */ | |
135 | ||
136 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
137 | addr = (struct sockaddr_can *)skb->cb; | |
138 | memset(addr, 0, sizeof(*addr)); | |
139 | addr->can_family = AF_CAN; | |
140 | addr->can_ifindex = skb->dev->ifindex; | |
141 | ||
1e55659c OH |
142 | /* add CAN specific message flags for raw_recvmsg() */ |
143 | pflags = raw_flags(skb); | |
144 | *pflags = 0; | |
145 | if (oskb->sk) | |
146 | *pflags |= MSG_DONTROUTE; | |
147 | if (oskb->sk == sk) | |
148 | *pflags |= MSG_CONFIRM; | |
149 | ||
a219994b | 150 | if (sock_queue_rcv_skb(sk, skb) < 0) |
c18ce101 OH |
151 | kfree_skb(skb); |
152 | } | |
153 | ||
154 | static int raw_enable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 155 | struct can_filter *filter, int count) |
c18ce101 OH |
156 | { |
157 | int err = 0; | |
158 | int i; | |
159 | ||
160 | for (i = 0; i < count; i++) { | |
161 | err = can_rx_register(dev, filter[i].can_id, | |
162 | filter[i].can_mask, | |
163 | raw_rcv, sk, "raw"); | |
164 | if (err) { | |
165 | /* clean up successfully registered filters */ | |
166 | while (--i >= 0) | |
167 | can_rx_unregister(dev, filter[i].can_id, | |
168 | filter[i].can_mask, | |
169 | raw_rcv, sk); | |
170 | break; | |
171 | } | |
172 | } | |
173 | ||
174 | return err; | |
175 | } | |
176 | ||
177 | static int raw_enable_errfilter(struct net_device *dev, struct sock *sk, | |
178 | can_err_mask_t err_mask) | |
179 | { | |
180 | int err = 0; | |
181 | ||
182 | if (err_mask) | |
183 | err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG, | |
184 | raw_rcv, sk, "raw"); | |
185 | ||
186 | return err; | |
187 | } | |
188 | ||
189 | static void raw_disable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 190 | struct can_filter *filter, int count) |
c18ce101 OH |
191 | { |
192 | int i; | |
193 | ||
194 | for (i = 0; i < count; i++) | |
195 | can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask, | |
196 | raw_rcv, sk); | |
197 | } | |
198 | ||
199 | static inline void raw_disable_errfilter(struct net_device *dev, | |
200 | struct sock *sk, | |
201 | can_err_mask_t err_mask) | |
202 | ||
203 | { | |
204 | if (err_mask) | |
205 | can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG, | |
206 | raw_rcv, sk); | |
207 | } | |
208 | ||
209 | static inline void raw_disable_allfilters(struct net_device *dev, | |
210 | struct sock *sk) | |
211 | { | |
212 | struct raw_sock *ro = raw_sk(sk); | |
213 | ||
214 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
215 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
216 | } | |
217 | ||
218 | static int raw_enable_allfilters(struct net_device *dev, struct sock *sk) | |
219 | { | |
220 | struct raw_sock *ro = raw_sk(sk); | |
221 | int err; | |
222 | ||
223 | err = raw_enable_filters(dev, sk, ro->filter, ro->count); | |
224 | if (!err) { | |
225 | err = raw_enable_errfilter(dev, sk, ro->err_mask); | |
226 | if (err) | |
227 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
228 | } | |
229 | ||
230 | return err; | |
231 | } | |
232 | ||
233 | static int raw_notifier(struct notifier_block *nb, | |
234 | unsigned long msg, void *data) | |
235 | { | |
236 | struct net_device *dev = (struct net_device *)data; | |
237 | struct raw_sock *ro = container_of(nb, struct raw_sock, notifier); | |
238 | struct sock *sk = &ro->sk; | |
239 | ||
721499e8 | 240 | if (!net_eq(dev_net(dev), &init_net)) |
c18ce101 OH |
241 | return NOTIFY_DONE; |
242 | ||
243 | if (dev->type != ARPHRD_CAN) | |
244 | return NOTIFY_DONE; | |
245 | ||
246 | if (ro->ifindex != dev->ifindex) | |
247 | return NOTIFY_DONE; | |
248 | ||
249 | switch (msg) { | |
250 | ||
251 | case NETDEV_UNREGISTER: | |
252 | lock_sock(sk); | |
253 | /* remove current filters & unregister */ | |
254 | if (ro->bound) | |
255 | raw_disable_allfilters(dev, sk); | |
256 | ||
257 | if (ro->count > 1) | |
258 | kfree(ro->filter); | |
259 | ||
260 | ro->ifindex = 0; | |
261 | ro->bound = 0; | |
262 | ro->count = 0; | |
263 | release_sock(sk); | |
264 | ||
265 | sk->sk_err = ENODEV; | |
266 | if (!sock_flag(sk, SOCK_DEAD)) | |
267 | sk->sk_error_report(sk); | |
268 | break; | |
269 | ||
270 | case NETDEV_DOWN: | |
271 | sk->sk_err = ENETDOWN; | |
272 | if (!sock_flag(sk, SOCK_DEAD)) | |
273 | sk->sk_error_report(sk); | |
274 | break; | |
275 | } | |
276 | ||
277 | return NOTIFY_DONE; | |
278 | } | |
279 | ||
280 | static int raw_init(struct sock *sk) | |
281 | { | |
282 | struct raw_sock *ro = raw_sk(sk); | |
283 | ||
284 | ro->bound = 0; | |
285 | ro->ifindex = 0; | |
286 | ||
287 | /* set default filter to single entry dfilter */ | |
288 | ro->dfilter.can_id = 0; | |
289 | ro->dfilter.can_mask = MASK_ALL; | |
290 | ro->filter = &ro->dfilter; | |
291 | ro->count = 1; | |
292 | ||
293 | /* set default loopback behaviour */ | |
294 | ro->loopback = 1; | |
295 | ro->recv_own_msgs = 0; | |
296 | ||
297 | /* set notifier */ | |
298 | ro->notifier.notifier_call = raw_notifier; | |
299 | ||
300 | register_netdevice_notifier(&ro->notifier); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static int raw_release(struct socket *sock) | |
306 | { | |
307 | struct sock *sk = sock->sk; | |
10022a6c OH |
308 | struct raw_sock *ro; |
309 | ||
310 | if (!sk) | |
311 | return 0; | |
312 | ||
313 | ro = raw_sk(sk); | |
c18ce101 OH |
314 | |
315 | unregister_netdevice_notifier(&ro->notifier); | |
316 | ||
317 | lock_sock(sk); | |
318 | ||
319 | /* remove current filters & unregister */ | |
320 | if (ro->bound) { | |
321 | if (ro->ifindex) { | |
322 | struct net_device *dev; | |
323 | ||
324 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
325 | if (dev) { | |
326 | raw_disable_allfilters(dev, sk); | |
327 | dev_put(dev); | |
328 | } | |
329 | } else | |
330 | raw_disable_allfilters(NULL, sk); | |
331 | } | |
332 | ||
333 | if (ro->count > 1) | |
334 | kfree(ro->filter); | |
335 | ||
336 | ro->ifindex = 0; | |
337 | ro->bound = 0; | |
338 | ro->count = 0; | |
339 | ||
f7e5cc0c LW |
340 | sock_orphan(sk); |
341 | sock->sk = NULL; | |
342 | ||
c18ce101 OH |
343 | release_sock(sk); |
344 | sock_put(sk); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len) | |
350 | { | |
351 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
352 | struct sock *sk = sock->sk; | |
353 | struct raw_sock *ro = raw_sk(sk); | |
354 | int ifindex; | |
355 | int err = 0; | |
356 | int notify_enetdown = 0; | |
357 | ||
358 | if (len < sizeof(*addr)) | |
359 | return -EINVAL; | |
360 | ||
361 | lock_sock(sk); | |
362 | ||
363 | if (ro->bound && addr->can_ifindex == ro->ifindex) | |
364 | goto out; | |
365 | ||
366 | if (addr->can_ifindex) { | |
367 | struct net_device *dev; | |
368 | ||
369 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
370 | if (!dev) { | |
371 | err = -ENODEV; | |
372 | goto out; | |
373 | } | |
374 | if (dev->type != ARPHRD_CAN) { | |
375 | dev_put(dev); | |
376 | err = -ENODEV; | |
377 | goto out; | |
378 | } | |
379 | if (!(dev->flags & IFF_UP)) | |
380 | notify_enetdown = 1; | |
381 | ||
382 | ifindex = dev->ifindex; | |
383 | ||
384 | /* filters set by default/setsockopt */ | |
385 | err = raw_enable_allfilters(dev, sk); | |
386 | dev_put(dev); | |
c18ce101 OH |
387 | } else { |
388 | ifindex = 0; | |
389 | ||
390 | /* filters set by default/setsockopt */ | |
391 | err = raw_enable_allfilters(NULL, sk); | |
392 | } | |
393 | ||
394 | if (!err) { | |
395 | if (ro->bound) { | |
396 | /* unregister old filters */ | |
397 | if (ro->ifindex) { | |
398 | struct net_device *dev; | |
399 | ||
400 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
401 | if (dev) { | |
402 | raw_disable_allfilters(dev, sk); | |
403 | dev_put(dev); | |
404 | } | |
405 | } else | |
406 | raw_disable_allfilters(NULL, sk); | |
407 | } | |
408 | ro->ifindex = ifindex; | |
409 | ro->bound = 1; | |
410 | } | |
411 | ||
412 | out: | |
413 | release_sock(sk); | |
414 | ||
415 | if (notify_enetdown) { | |
416 | sk->sk_err = ENETDOWN; | |
417 | if (!sock_flag(sk, SOCK_DEAD)) | |
418 | sk->sk_error_report(sk); | |
419 | } | |
420 | ||
421 | return err; | |
422 | } | |
423 | ||
424 | static int raw_getname(struct socket *sock, struct sockaddr *uaddr, | |
425 | int *len, int peer) | |
426 | { | |
427 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
428 | struct sock *sk = sock->sk; | |
429 | struct raw_sock *ro = raw_sk(sk); | |
430 | ||
431 | if (peer) | |
432 | return -EOPNOTSUPP; | |
433 | ||
e84b90ae | 434 | memset(addr, 0, sizeof(*addr)); |
c18ce101 OH |
435 | addr->can_family = AF_CAN; |
436 | addr->can_ifindex = ro->ifindex; | |
437 | ||
438 | *len = sizeof(*addr); | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | static int raw_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 444 | char __user *optval, unsigned int optlen) |
c18ce101 OH |
445 | { |
446 | struct sock *sk = sock->sk; | |
447 | struct raw_sock *ro = raw_sk(sk); | |
448 | struct can_filter *filter = NULL; /* dyn. alloc'ed filters */ | |
449 | struct can_filter sfilter; /* single filter */ | |
450 | struct net_device *dev = NULL; | |
451 | can_err_mask_t err_mask = 0; | |
452 | int count = 0; | |
453 | int err = 0; | |
454 | ||
455 | if (level != SOL_CAN_RAW) | |
456 | return -EINVAL; | |
c18ce101 OH |
457 | |
458 | switch (optname) { | |
459 | ||
460 | case CAN_RAW_FILTER: | |
461 | if (optlen % sizeof(struct can_filter) != 0) | |
462 | return -EINVAL; | |
463 | ||
464 | count = optlen / sizeof(struct can_filter); | |
465 | ||
466 | if (count > 1) { | |
467 | /* filter does not fit into dfilter => alloc space */ | |
16dff918 JL |
468 | filter = memdup_user(optval, optlen); |
469 | if (IS_ERR(filter)) | |
470 | return PTR_ERR(filter); | |
c18ce101 | 471 | } else if (count == 1) { |
4ffa8701 | 472 | if (copy_from_user(&sfilter, optval, sizeof(sfilter))) |
3f91bd42 | 473 | return -EFAULT; |
c18ce101 OH |
474 | } |
475 | ||
476 | lock_sock(sk); | |
477 | ||
478 | if (ro->bound && ro->ifindex) | |
479 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
480 | ||
481 | if (ro->bound) { | |
482 | /* (try to) register the new filters */ | |
483 | if (count == 1) | |
484 | err = raw_enable_filters(dev, sk, &sfilter, 1); | |
485 | else | |
486 | err = raw_enable_filters(dev, sk, filter, | |
487 | count); | |
488 | if (err) { | |
489 | if (count > 1) | |
490 | kfree(filter); | |
c18ce101 OH |
491 | goto out_fil; |
492 | } | |
493 | ||
494 | /* remove old filter registrations */ | |
495 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
496 | } | |
497 | ||
498 | /* remove old filter space */ | |
499 | if (ro->count > 1) | |
500 | kfree(ro->filter); | |
501 | ||
502 | /* link new filters to the socket */ | |
503 | if (count == 1) { | |
504 | /* copy filter data for single filter */ | |
505 | ro->dfilter = sfilter; | |
506 | filter = &ro->dfilter; | |
507 | } | |
508 | ro->filter = filter; | |
509 | ro->count = count; | |
510 | ||
511 | out_fil: | |
512 | if (dev) | |
513 | dev_put(dev); | |
514 | ||
515 | release_sock(sk); | |
516 | ||
517 | break; | |
518 | ||
519 | case CAN_RAW_ERR_FILTER: | |
520 | if (optlen != sizeof(err_mask)) | |
521 | return -EINVAL; | |
522 | ||
3f91bd42 SR |
523 | if (copy_from_user(&err_mask, optval, optlen)) |
524 | return -EFAULT; | |
c18ce101 OH |
525 | |
526 | err_mask &= CAN_ERR_MASK; | |
527 | ||
528 | lock_sock(sk); | |
529 | ||
530 | if (ro->bound && ro->ifindex) | |
531 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
532 | ||
533 | /* remove current error mask */ | |
534 | if (ro->bound) { | |
535 | /* (try to) register the new err_mask */ | |
536 | err = raw_enable_errfilter(dev, sk, err_mask); | |
537 | ||
538 | if (err) | |
539 | goto out_err; | |
540 | ||
541 | /* remove old err_mask registration */ | |
542 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
543 | } | |
544 | ||
545 | /* link new err_mask to the socket */ | |
546 | ro->err_mask = err_mask; | |
547 | ||
548 | out_err: | |
549 | if (dev) | |
550 | dev_put(dev); | |
551 | ||
552 | release_sock(sk); | |
553 | ||
554 | break; | |
555 | ||
556 | case CAN_RAW_LOOPBACK: | |
557 | if (optlen != sizeof(ro->loopback)) | |
558 | return -EINVAL; | |
559 | ||
3f91bd42 SR |
560 | if (copy_from_user(&ro->loopback, optval, optlen)) |
561 | return -EFAULT; | |
c18ce101 OH |
562 | |
563 | break; | |
564 | ||
565 | case CAN_RAW_RECV_OWN_MSGS: | |
566 | if (optlen != sizeof(ro->recv_own_msgs)) | |
567 | return -EINVAL; | |
568 | ||
3f91bd42 SR |
569 | if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) |
570 | return -EFAULT; | |
c18ce101 OH |
571 | |
572 | break; | |
573 | ||
574 | default: | |
575 | return -ENOPROTOOPT; | |
576 | } | |
577 | return err; | |
578 | } | |
579 | ||
580 | static int raw_getsockopt(struct socket *sock, int level, int optname, | |
581 | char __user *optval, int __user *optlen) | |
582 | { | |
583 | struct sock *sk = sock->sk; | |
584 | struct raw_sock *ro = raw_sk(sk); | |
585 | int len; | |
586 | void *val; | |
587 | int err = 0; | |
588 | ||
589 | if (level != SOL_CAN_RAW) | |
590 | return -EINVAL; | |
591 | if (get_user(len, optlen)) | |
592 | return -EFAULT; | |
593 | if (len < 0) | |
594 | return -EINVAL; | |
595 | ||
596 | switch (optname) { | |
597 | ||
598 | case CAN_RAW_FILTER: | |
599 | lock_sock(sk); | |
600 | if (ro->count > 0) { | |
601 | int fsize = ro->count * sizeof(struct can_filter); | |
602 | if (len > fsize) | |
603 | len = fsize; | |
653252c2 PE |
604 | if (copy_to_user(optval, ro->filter, len)) |
605 | err = -EFAULT; | |
c18ce101 OH |
606 | } else |
607 | len = 0; | |
608 | release_sock(sk); | |
609 | ||
610 | if (!err) | |
611 | err = put_user(len, optlen); | |
612 | return err; | |
613 | ||
614 | case CAN_RAW_ERR_FILTER: | |
615 | if (len > sizeof(can_err_mask_t)) | |
616 | len = sizeof(can_err_mask_t); | |
617 | val = &ro->err_mask; | |
618 | break; | |
619 | ||
620 | case CAN_RAW_LOOPBACK: | |
621 | if (len > sizeof(int)) | |
622 | len = sizeof(int); | |
623 | val = &ro->loopback; | |
624 | break; | |
625 | ||
626 | case CAN_RAW_RECV_OWN_MSGS: | |
627 | if (len > sizeof(int)) | |
628 | len = sizeof(int); | |
629 | val = &ro->recv_own_msgs; | |
630 | break; | |
631 | ||
632 | default: | |
633 | return -ENOPROTOOPT; | |
634 | } | |
635 | ||
636 | if (put_user(len, optlen)) | |
637 | return -EFAULT; | |
638 | if (copy_to_user(optval, val, len)) | |
639 | return -EFAULT; | |
640 | return 0; | |
641 | } | |
642 | ||
643 | static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, | |
644 | struct msghdr *msg, size_t size) | |
645 | { | |
646 | struct sock *sk = sock->sk; | |
647 | struct raw_sock *ro = raw_sk(sk); | |
648 | struct sk_buff *skb; | |
649 | struct net_device *dev; | |
650 | int ifindex; | |
651 | int err; | |
652 | ||
653 | if (msg->msg_name) { | |
654 | struct sockaddr_can *addr = | |
655 | (struct sockaddr_can *)msg->msg_name; | |
656 | ||
5e507328 KVD |
657 | if (msg->msg_namelen < sizeof(*addr)) |
658 | return -EINVAL; | |
659 | ||
c18ce101 OH |
660 | if (addr->can_family != AF_CAN) |
661 | return -EINVAL; | |
662 | ||
663 | ifindex = addr->can_ifindex; | |
664 | } else | |
665 | ifindex = ro->ifindex; | |
666 | ||
7f2d38eb OH |
667 | if (size != sizeof(struct can_frame)) |
668 | return -EINVAL; | |
669 | ||
c18ce101 OH |
670 | dev = dev_get_by_index(&init_net, ifindex); |
671 | if (!dev) | |
672 | return -ENXIO; | |
673 | ||
674 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, | |
675 | &err); | |
ebad5c09 IJ |
676 | if (!skb) |
677 | goto put_dev; | |
c18ce101 OH |
678 | |
679 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
51f31cab PO |
680 | if (err < 0) |
681 | goto free_skb; | |
2244d07b | 682 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ebad5c09 IJ |
683 | if (err < 0) |
684 | goto free_skb; | |
cff0d6e6 OH |
685 | |
686 | /* to be able to check the received tx sock reference in raw_rcv() */ | |
2244d07b | 687 | skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF; |
cff0d6e6 | 688 | |
c18ce101 OH |
689 | skb->dev = dev; |
690 | skb->sk = sk; | |
691 | ||
692 | err = can_send(skb, ro->loopback); | |
693 | ||
694 | dev_put(dev); | |
695 | ||
696 | if (err) | |
ebad5c09 | 697 | goto send_failed; |
c18ce101 OH |
698 | |
699 | return size; | |
ebad5c09 IJ |
700 | |
701 | free_skb: | |
702 | kfree_skb(skb); | |
703 | put_dev: | |
704 | dev_put(dev); | |
705 | send_failed: | |
706 | return err; | |
c18ce101 OH |
707 | } |
708 | ||
709 | static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, | |
710 | struct msghdr *msg, size_t size, int flags) | |
711 | { | |
712 | struct sock *sk = sock->sk; | |
713 | struct sk_buff *skb; | |
a219994b | 714 | int err = 0; |
c18ce101 OH |
715 | int noblock; |
716 | ||
717 | noblock = flags & MSG_DONTWAIT; | |
718 | flags &= ~MSG_DONTWAIT; | |
719 | ||
a219994b | 720 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
c18ce101 | 721 | if (!skb) |
a219994b | 722 | return err; |
c18ce101 OH |
723 | |
724 | if (size < skb->len) | |
725 | msg->msg_flags |= MSG_TRUNC; | |
726 | else | |
727 | size = skb->len; | |
728 | ||
a219994b UT |
729 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); |
730 | if (err < 0) { | |
c18ce101 | 731 | skb_free_datagram(sk, skb); |
a219994b | 732 | return err; |
c18ce101 OH |
733 | } |
734 | ||
3b885787 | 735 | sock_recv_ts_and_drops(msg, sk, skb); |
c18ce101 OH |
736 | |
737 | if (msg->msg_name) { | |
738 | msg->msg_namelen = sizeof(struct sockaddr_can); | |
739 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
740 | } | |
741 | ||
1e55659c OH |
742 | /* assign the flags that have been recorded in raw_rcv() */ |
743 | msg->msg_flags |= *(raw_flags(skb)); | |
744 | ||
c18ce101 OH |
745 | skb_free_datagram(sk, skb); |
746 | ||
747 | return size; | |
748 | } | |
749 | ||
53914b67 | 750 | static const struct proto_ops raw_ops = { |
c18ce101 OH |
751 | .family = PF_CAN, |
752 | .release = raw_release, | |
753 | .bind = raw_bind, | |
754 | .connect = sock_no_connect, | |
755 | .socketpair = sock_no_socketpair, | |
756 | .accept = sock_no_accept, | |
757 | .getname = raw_getname, | |
758 | .poll = datagram_poll, | |
53914b67 | 759 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
c18ce101 OH |
760 | .listen = sock_no_listen, |
761 | .shutdown = sock_no_shutdown, | |
762 | .setsockopt = raw_setsockopt, | |
763 | .getsockopt = raw_getsockopt, | |
764 | .sendmsg = raw_sendmsg, | |
765 | .recvmsg = raw_recvmsg, | |
766 | .mmap = sock_no_mmap, | |
767 | .sendpage = sock_no_sendpage, | |
768 | }; | |
769 | ||
770 | static struct proto raw_proto __read_mostly = { | |
771 | .name = "CAN_RAW", | |
772 | .owner = THIS_MODULE, | |
773 | .obj_size = sizeof(struct raw_sock), | |
774 | .init = raw_init, | |
775 | }; | |
776 | ||
777 | static struct can_proto raw_can_proto __read_mostly = { | |
778 | .type = SOCK_RAW, | |
779 | .protocol = CAN_RAW, | |
c18ce101 OH |
780 | .ops = &raw_ops, |
781 | .prot = &raw_proto, | |
782 | }; | |
783 | ||
784 | static __init int raw_module_init(void) | |
785 | { | |
786 | int err; | |
787 | ||
788 | printk(banner); | |
789 | ||
790 | err = can_proto_register(&raw_can_proto); | |
791 | if (err < 0) | |
792 | printk(KERN_ERR "can: registration of raw protocol failed\n"); | |
793 | ||
794 | return err; | |
795 | } | |
796 | ||
797 | static __exit void raw_module_exit(void) | |
798 | { | |
799 | can_proto_unregister(&raw_can_proto); | |
800 | } | |
801 | ||
802 | module_init(raw_module_init); | |
803 | module_exit(raw_module_exit); |