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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 | ||
93 | static inline struct raw_sock *raw_sk(const struct sock *sk) | |
94 | { | |
95 | return (struct raw_sock *)sk; | |
96 | } | |
97 | ||
98 | static 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; | |
c18ce101 | 103 | |
1fa17d4b OH |
104 | /* 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; | |
c18ce101 OH |
112 | |
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 | ||
a219994b | 126 | if (sock_queue_rcv_skb(sk, skb) < 0) |
c18ce101 OH |
127 | kfree_skb(skb); |
128 | } | |
129 | ||
130 | static int raw_enable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 131 | struct can_filter *filter, int count) |
c18ce101 OH |
132 | { |
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 | ||
153 | static 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 | ||
165 | static void raw_disable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 166 | struct can_filter *filter, int count) |
c18ce101 OH |
167 | { |
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 | ||
175 | static 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 | ||
185 | static 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 | ||
194 | static 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 | ||
209 | static 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 | ||
721499e8 | 216 | if (!net_eq(dev_net(dev), &init_net)) |
c18ce101 OH |
217 | 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 | ||
256 | static 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 | ||
281 | static 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 | ||
f7e5cc0c LW |
311 | sock_orphan(sk); |
312 | sock->sk = NULL; | |
313 | ||
c18ce101 OH |
314 | release_sock(sk); |
315 | sock_put(sk); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static 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); | |
c18ce101 OH |
358 | } 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 | ||
395 | static 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 | ||
e84b90ae | 405 | memset(addr, 0, sizeof(*addr)); |
c18ce101 OH |
406 | addr->can_family = AF_CAN; |
407 | addr->can_ifindex = ro->ifindex; | |
408 | ||
409 | *len = sizeof(*addr); | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | static int raw_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 415 | char __user *optval, unsigned int optlen) |
c18ce101 OH |
416 | { |
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; | |
c18ce101 OH |
428 | |
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 | ||
3f91bd42 | 443 | if (copy_from_user(filter, optval, optlen)) { |
c18ce101 | 444 | kfree(filter); |
3f91bd42 | 445 | return -EFAULT; |
c18ce101 OH |
446 | } |
447 | } else if (count == 1) { | |
3f91bd42 SR |
448 | if (copy_from_user(&sfilter, optval, optlen)) |
449 | return -EFAULT; | |
c18ce101 OH |
450 | } |
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); | |
c18ce101 OH |
467 | 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 | ||
3f91bd42 SR |
499 | if (copy_from_user(&err_mask, optval, optlen)) |
500 | return -EFAULT; | |
c18ce101 OH |
501 | |
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 | ||
3f91bd42 SR |
536 | if (copy_from_user(&ro->loopback, optval, optlen)) |
537 | return -EFAULT; | |
c18ce101 OH |
538 | |
539 | break; | |
540 | ||
541 | case CAN_RAW_RECV_OWN_MSGS: | |
542 | if (optlen != sizeof(ro->recv_own_msgs)) | |
543 | return -EINVAL; | |
544 | ||
3f91bd42 SR |
545 | if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) |
546 | return -EFAULT; | |
c18ce101 OH |
547 | |
548 | break; | |
549 | ||
550 | default: | |
551 | return -ENOPROTOOPT; | |
552 | } | |
553 | return err; | |
554 | } | |
555 | ||
556 | static 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; | |
653252c2 PE |
580 | if (copy_to_user(optval, ro->filter, len)) |
581 | err = -EFAULT; | |
c18ce101 OH |
582 | } 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 | ||
619 | static 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 | ||
7f2d38eb OH |
640 | if (size != sizeof(struct can_frame)) |
641 | return -EINVAL; | |
642 | ||
c18ce101 OH |
643 | 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); | |
ebad5c09 IJ |
649 | if (!skb) |
650 | goto put_dev; | |
c18ce101 OH |
651 | |
652 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
51f31cab PO |
653 | if (err < 0) |
654 | goto free_skb; | |
655 | err = sock_tx_timestamp(msg, sk, skb_tx(skb)); | |
ebad5c09 IJ |
656 | if (err < 0) |
657 | goto free_skb; | |
c18ce101 OH |
658 | skb->dev = dev; |
659 | skb->sk = sk; | |
660 | ||
661 | err = can_send(skb, ro->loopback); | |
662 | ||
663 | dev_put(dev); | |
664 | ||
665 | if (err) | |
ebad5c09 | 666 | goto send_failed; |
c18ce101 OH |
667 | |
668 | return size; | |
ebad5c09 IJ |
669 | |
670 | free_skb: | |
671 | kfree_skb(skb); | |
672 | put_dev: | |
673 | dev_put(dev); | |
674 | send_failed: | |
675 | return err; | |
c18ce101 OH |
676 | } |
677 | ||
678 | static 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; | |
a219994b | 683 | int err = 0; |
c18ce101 OH |
684 | int noblock; |
685 | ||
686 | noblock = flags & MSG_DONTWAIT; | |
687 | flags &= ~MSG_DONTWAIT; | |
688 | ||
a219994b | 689 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
c18ce101 | 690 | if (!skb) |
a219994b | 691 | return err; |
c18ce101 OH |
692 | |
693 | if (size < skb->len) | |
694 | msg->msg_flags |= MSG_TRUNC; | |
695 | else | |
696 | size = skb->len; | |
697 | ||
a219994b UT |
698 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); |
699 | if (err < 0) { | |
c18ce101 | 700 | skb_free_datagram(sk, skb); |
a219994b | 701 | return err; |
c18ce101 OH |
702 | } |
703 | ||
3b885787 | 704 | sock_recv_ts_and_drops(msg, sk, skb); |
c18ce101 OH |
705 | |
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 | ||
716 | static 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 | ||
736 | static 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 | ||
743 | static struct can_proto raw_can_proto __read_mostly = { | |
744 | .type = SOCK_RAW, | |
745 | .protocol = CAN_RAW, | |
c18ce101 OH |
746 | .ops = &raw_ops, |
747 | .prot = &raw_proto, | |
748 | }; | |
749 | ||
750 | static __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 | ||
763 | static __exit void raw_module_exit(void) | |
764 | { | |
765 | can_proto_unregister(&raw_can_proto); | |
766 | } | |
767 | ||
768 | module_init(raw_module_init); | |
769 | module_exit(raw_module_exit); |