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> | |
48 | #include <linux/netdevice.h> | |
49 | #include <linux/socket.h> | |
50 | #include <linux/if_arp.h> | |
51 | #include <linux/skbuff.h> | |
52 | #include <linux/can.h> | |
53 | #include <linux/can/core.h> | |
54 | #include <linux/can/raw.h> | |
55 | #include <net/sock.h> | |
56 | #include <net/net_namespace.h> | |
57 | ||
58 | #define CAN_RAW_VERSION CAN_VERSION | |
59 | static __initdata const char banner[] = | |
60 | KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n"; | |
61 | ||
62 | MODULE_DESCRIPTION("PF_CAN raw protocol"); | |
63 | MODULE_LICENSE("Dual BSD/GPL"); | |
64 | MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>"); | |
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 | ||
91 | static inline struct raw_sock *raw_sk(const struct sock *sk) | |
92 | { | |
93 | return (struct raw_sock *)sk; | |
94 | } | |
95 | ||
96 | static void raw_rcv(struct sk_buff *skb, void *data) | |
97 | { | |
98 | struct sock *sk = (struct sock *)data; | |
99 | struct raw_sock *ro = raw_sk(sk); | |
100 | struct sockaddr_can *addr; | |
c18ce101 OH |
101 | |
102 | if (!ro->recv_own_msgs) { | |
103 | /* check the received tx sock reference */ | |
104 | if (skb->sk == sk) { | |
105 | kfree_skb(skb); | |
106 | return; | |
107 | } | |
108 | } | |
109 | ||
110 | /* | |
111 | * Put the datagram to the queue so that raw_recvmsg() can | |
112 | * get it from there. We need to pass the interface index to | |
113 | * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
114 | * containing the interface index. | |
115 | */ | |
116 | ||
117 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
118 | addr = (struct sockaddr_can *)skb->cb; | |
119 | memset(addr, 0, sizeof(*addr)); | |
120 | addr->can_family = AF_CAN; | |
121 | addr->can_ifindex = skb->dev->ifindex; | |
122 | ||
a219994b | 123 | if (sock_queue_rcv_skb(sk, skb) < 0) |
c18ce101 OH |
124 | kfree_skb(skb); |
125 | } | |
126 | ||
127 | static int raw_enable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 128 | struct can_filter *filter, int count) |
c18ce101 OH |
129 | { |
130 | int err = 0; | |
131 | int i; | |
132 | ||
133 | for (i = 0; i < count; i++) { | |
134 | err = can_rx_register(dev, filter[i].can_id, | |
135 | filter[i].can_mask, | |
136 | raw_rcv, sk, "raw"); | |
137 | if (err) { | |
138 | /* clean up successfully registered filters */ | |
139 | while (--i >= 0) | |
140 | can_rx_unregister(dev, filter[i].can_id, | |
141 | filter[i].can_mask, | |
142 | raw_rcv, sk); | |
143 | break; | |
144 | } | |
145 | } | |
146 | ||
147 | return err; | |
148 | } | |
149 | ||
150 | static int raw_enable_errfilter(struct net_device *dev, struct sock *sk, | |
151 | can_err_mask_t err_mask) | |
152 | { | |
153 | int err = 0; | |
154 | ||
155 | if (err_mask) | |
156 | err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG, | |
157 | raw_rcv, sk, "raw"); | |
158 | ||
159 | return err; | |
160 | } | |
161 | ||
162 | static void raw_disable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 163 | struct can_filter *filter, int count) |
c18ce101 OH |
164 | { |
165 | int i; | |
166 | ||
167 | for (i = 0; i < count; i++) | |
168 | can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask, | |
169 | raw_rcv, sk); | |
170 | } | |
171 | ||
172 | static inline void raw_disable_errfilter(struct net_device *dev, | |
173 | struct sock *sk, | |
174 | can_err_mask_t err_mask) | |
175 | ||
176 | { | |
177 | if (err_mask) | |
178 | can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG, | |
179 | raw_rcv, sk); | |
180 | } | |
181 | ||
182 | static inline void raw_disable_allfilters(struct net_device *dev, | |
183 | struct sock *sk) | |
184 | { | |
185 | struct raw_sock *ro = raw_sk(sk); | |
186 | ||
187 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
188 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
189 | } | |
190 | ||
191 | static int raw_enable_allfilters(struct net_device *dev, struct sock *sk) | |
192 | { | |
193 | struct raw_sock *ro = raw_sk(sk); | |
194 | int err; | |
195 | ||
196 | err = raw_enable_filters(dev, sk, ro->filter, ro->count); | |
197 | if (!err) { | |
198 | err = raw_enable_errfilter(dev, sk, ro->err_mask); | |
199 | if (err) | |
200 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
201 | } | |
202 | ||
203 | return err; | |
204 | } | |
205 | ||
206 | static int raw_notifier(struct notifier_block *nb, | |
207 | unsigned long msg, void *data) | |
208 | { | |
209 | struct net_device *dev = (struct net_device *)data; | |
210 | struct raw_sock *ro = container_of(nb, struct raw_sock, notifier); | |
211 | struct sock *sk = &ro->sk; | |
212 | ||
721499e8 | 213 | if (!net_eq(dev_net(dev), &init_net)) |
c18ce101 OH |
214 | return NOTIFY_DONE; |
215 | ||
216 | if (dev->type != ARPHRD_CAN) | |
217 | return NOTIFY_DONE; | |
218 | ||
219 | if (ro->ifindex != dev->ifindex) | |
220 | return NOTIFY_DONE; | |
221 | ||
222 | switch (msg) { | |
223 | ||
224 | case NETDEV_UNREGISTER: | |
225 | lock_sock(sk); | |
226 | /* remove current filters & unregister */ | |
227 | if (ro->bound) | |
228 | raw_disable_allfilters(dev, sk); | |
229 | ||
230 | if (ro->count > 1) | |
231 | kfree(ro->filter); | |
232 | ||
233 | ro->ifindex = 0; | |
234 | ro->bound = 0; | |
235 | ro->count = 0; | |
236 | release_sock(sk); | |
237 | ||
238 | sk->sk_err = ENODEV; | |
239 | if (!sock_flag(sk, SOCK_DEAD)) | |
240 | sk->sk_error_report(sk); | |
241 | break; | |
242 | ||
243 | case NETDEV_DOWN: | |
244 | sk->sk_err = ENETDOWN; | |
245 | if (!sock_flag(sk, SOCK_DEAD)) | |
246 | sk->sk_error_report(sk); | |
247 | break; | |
248 | } | |
249 | ||
250 | return NOTIFY_DONE; | |
251 | } | |
252 | ||
253 | static int raw_init(struct sock *sk) | |
254 | { | |
255 | struct raw_sock *ro = raw_sk(sk); | |
256 | ||
257 | ro->bound = 0; | |
258 | ro->ifindex = 0; | |
259 | ||
260 | /* set default filter to single entry dfilter */ | |
261 | ro->dfilter.can_id = 0; | |
262 | ro->dfilter.can_mask = MASK_ALL; | |
263 | ro->filter = &ro->dfilter; | |
264 | ro->count = 1; | |
265 | ||
266 | /* set default loopback behaviour */ | |
267 | ro->loopback = 1; | |
268 | ro->recv_own_msgs = 0; | |
269 | ||
270 | /* set notifier */ | |
271 | ro->notifier.notifier_call = raw_notifier; | |
272 | ||
273 | register_netdevice_notifier(&ro->notifier); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static int raw_release(struct socket *sock) | |
279 | { | |
280 | struct sock *sk = sock->sk; | |
281 | struct raw_sock *ro = raw_sk(sk); | |
282 | ||
283 | unregister_netdevice_notifier(&ro->notifier); | |
284 | ||
285 | lock_sock(sk); | |
286 | ||
287 | /* remove current filters & unregister */ | |
288 | if (ro->bound) { | |
289 | if (ro->ifindex) { | |
290 | struct net_device *dev; | |
291 | ||
292 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
293 | if (dev) { | |
294 | raw_disable_allfilters(dev, sk); | |
295 | dev_put(dev); | |
296 | } | |
297 | } else | |
298 | raw_disable_allfilters(NULL, sk); | |
299 | } | |
300 | ||
301 | if (ro->count > 1) | |
302 | kfree(ro->filter); | |
303 | ||
304 | ro->ifindex = 0; | |
305 | ro->bound = 0; | |
306 | ro->count = 0; | |
307 | ||
308 | release_sock(sk); | |
309 | sock_put(sk); | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len) | |
315 | { | |
316 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
317 | struct sock *sk = sock->sk; | |
318 | struct raw_sock *ro = raw_sk(sk); | |
319 | int ifindex; | |
320 | int err = 0; | |
321 | int notify_enetdown = 0; | |
322 | ||
323 | if (len < sizeof(*addr)) | |
324 | return -EINVAL; | |
325 | ||
326 | lock_sock(sk); | |
327 | ||
328 | if (ro->bound && addr->can_ifindex == ro->ifindex) | |
329 | goto out; | |
330 | ||
331 | if (addr->can_ifindex) { | |
332 | struct net_device *dev; | |
333 | ||
334 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
335 | if (!dev) { | |
336 | err = -ENODEV; | |
337 | goto out; | |
338 | } | |
339 | if (dev->type != ARPHRD_CAN) { | |
340 | dev_put(dev); | |
341 | err = -ENODEV; | |
342 | goto out; | |
343 | } | |
344 | if (!(dev->flags & IFF_UP)) | |
345 | notify_enetdown = 1; | |
346 | ||
347 | ifindex = dev->ifindex; | |
348 | ||
349 | /* filters set by default/setsockopt */ | |
350 | err = raw_enable_allfilters(dev, sk); | |
351 | dev_put(dev); | |
c18ce101 OH |
352 | } else { |
353 | ifindex = 0; | |
354 | ||
355 | /* filters set by default/setsockopt */ | |
356 | err = raw_enable_allfilters(NULL, sk); | |
357 | } | |
358 | ||
359 | if (!err) { | |
360 | if (ro->bound) { | |
361 | /* unregister old filters */ | |
362 | if (ro->ifindex) { | |
363 | struct net_device *dev; | |
364 | ||
365 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
366 | if (dev) { | |
367 | raw_disable_allfilters(dev, sk); | |
368 | dev_put(dev); | |
369 | } | |
370 | } else | |
371 | raw_disable_allfilters(NULL, sk); | |
372 | } | |
373 | ro->ifindex = ifindex; | |
374 | ro->bound = 1; | |
375 | } | |
376 | ||
377 | out: | |
378 | release_sock(sk); | |
379 | ||
380 | if (notify_enetdown) { | |
381 | sk->sk_err = ENETDOWN; | |
382 | if (!sock_flag(sk, SOCK_DEAD)) | |
383 | sk->sk_error_report(sk); | |
384 | } | |
385 | ||
386 | return err; | |
387 | } | |
388 | ||
389 | static int raw_getname(struct socket *sock, struct sockaddr *uaddr, | |
390 | int *len, int peer) | |
391 | { | |
392 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
393 | struct sock *sk = sock->sk; | |
394 | struct raw_sock *ro = raw_sk(sk); | |
395 | ||
396 | if (peer) | |
397 | return -EOPNOTSUPP; | |
398 | ||
399 | addr->can_family = AF_CAN; | |
400 | addr->can_ifindex = ro->ifindex; | |
401 | ||
402 | *len = sizeof(*addr); | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | static int raw_setsockopt(struct socket *sock, int level, int optname, | |
408 | char __user *optval, int optlen) | |
409 | { | |
410 | struct sock *sk = sock->sk; | |
411 | struct raw_sock *ro = raw_sk(sk); | |
412 | struct can_filter *filter = NULL; /* dyn. alloc'ed filters */ | |
413 | struct can_filter sfilter; /* single filter */ | |
414 | struct net_device *dev = NULL; | |
415 | can_err_mask_t err_mask = 0; | |
416 | int count = 0; | |
417 | int err = 0; | |
418 | ||
419 | if (level != SOL_CAN_RAW) | |
420 | return -EINVAL; | |
421 | if (optlen < 0) | |
422 | return -EINVAL; | |
423 | ||
424 | switch (optname) { | |
425 | ||
426 | case CAN_RAW_FILTER: | |
427 | if (optlen % sizeof(struct can_filter) != 0) | |
428 | return -EINVAL; | |
429 | ||
430 | count = optlen / sizeof(struct can_filter); | |
431 | ||
432 | if (count > 1) { | |
433 | /* filter does not fit into dfilter => alloc space */ | |
434 | filter = kmalloc(optlen, GFP_KERNEL); | |
435 | if (!filter) | |
436 | return -ENOMEM; | |
437 | ||
3f91bd42 | 438 | if (copy_from_user(filter, optval, optlen)) { |
c18ce101 | 439 | kfree(filter); |
3f91bd42 | 440 | return -EFAULT; |
c18ce101 OH |
441 | } |
442 | } else if (count == 1) { | |
3f91bd42 SR |
443 | if (copy_from_user(&sfilter, optval, optlen)) |
444 | return -EFAULT; | |
c18ce101 OH |
445 | } |
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); | |
c18ce101 OH |
462 | 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 | ||
3f91bd42 SR |
494 | if (copy_from_user(&err_mask, optval, optlen)) |
495 | return -EFAULT; | |
c18ce101 OH |
496 | |
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 | ||
3f91bd42 SR |
531 | if (copy_from_user(&ro->loopback, optval, optlen)) |
532 | return -EFAULT; | |
c18ce101 OH |
533 | |
534 | break; | |
535 | ||
536 | case CAN_RAW_RECV_OWN_MSGS: | |
537 | if (optlen != sizeof(ro->recv_own_msgs)) | |
538 | return -EINVAL; | |
539 | ||
3f91bd42 SR |
540 | if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) |
541 | return -EFAULT; | |
c18ce101 OH |
542 | |
543 | break; | |
544 | ||
545 | default: | |
546 | return -ENOPROTOOPT; | |
547 | } | |
548 | return err; | |
549 | } | |
550 | ||
551 | static 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; | |
653252c2 PE |
575 | if (copy_to_user(optval, ro->filter, len)) |
576 | err = -EFAULT; | |
c18ce101 OH |
577 | } 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 | ||
614 | static 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 | ||
7f2d38eb OH |
635 | if (size != sizeof(struct can_frame)) |
636 | return -EINVAL; | |
637 | ||
c18ce101 OH |
638 | 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); | |
644 | if (!skb) { | |
645 | dev_put(dev); | |
646 | return err; | |
647 | } | |
648 | ||
649 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
650 | if (err < 0) { | |
651 | kfree_skb(skb); | |
652 | dev_put(dev); | |
653 | return err; | |
654 | } | |
655 | skb->dev = dev; | |
656 | skb->sk = sk; | |
657 | ||
658 | err = can_send(skb, ro->loopback); | |
659 | ||
660 | dev_put(dev); | |
661 | ||
662 | if (err) | |
663 | return err; | |
664 | ||
665 | return size; | |
666 | } | |
667 | ||
668 | static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, | |
669 | struct msghdr *msg, size_t size, int flags) | |
670 | { | |
671 | struct sock *sk = sock->sk; | |
672 | struct sk_buff *skb; | |
a219994b | 673 | int err = 0; |
c18ce101 OH |
674 | int noblock; |
675 | ||
676 | noblock = flags & MSG_DONTWAIT; | |
677 | flags &= ~MSG_DONTWAIT; | |
678 | ||
a219994b | 679 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
c18ce101 | 680 | if (!skb) |
a219994b | 681 | return err; |
c18ce101 OH |
682 | |
683 | if (size < skb->len) | |
684 | msg->msg_flags |= MSG_TRUNC; | |
685 | else | |
686 | size = skb->len; | |
687 | ||
a219994b UT |
688 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); |
689 | if (err < 0) { | |
c18ce101 | 690 | skb_free_datagram(sk, skb); |
a219994b | 691 | return err; |
c18ce101 OH |
692 | } |
693 | ||
694 | sock_recv_timestamp(msg, sk, skb); | |
695 | ||
696 | if (msg->msg_name) { | |
697 | msg->msg_namelen = sizeof(struct sockaddr_can); | |
698 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
699 | } | |
700 | ||
701 | skb_free_datagram(sk, skb); | |
702 | ||
703 | return size; | |
704 | } | |
705 | ||
706 | static struct proto_ops raw_ops __read_mostly = { | |
707 | .family = PF_CAN, | |
708 | .release = raw_release, | |
709 | .bind = raw_bind, | |
710 | .connect = sock_no_connect, | |
711 | .socketpair = sock_no_socketpair, | |
712 | .accept = sock_no_accept, | |
713 | .getname = raw_getname, | |
714 | .poll = datagram_poll, | |
715 | .ioctl = NULL, /* use can_ioctl() from af_can.c */ | |
716 | .listen = sock_no_listen, | |
717 | .shutdown = sock_no_shutdown, | |
718 | .setsockopt = raw_setsockopt, | |
719 | .getsockopt = raw_getsockopt, | |
720 | .sendmsg = raw_sendmsg, | |
721 | .recvmsg = raw_recvmsg, | |
722 | .mmap = sock_no_mmap, | |
723 | .sendpage = sock_no_sendpage, | |
724 | }; | |
725 | ||
726 | static struct proto raw_proto __read_mostly = { | |
727 | .name = "CAN_RAW", | |
728 | .owner = THIS_MODULE, | |
729 | .obj_size = sizeof(struct raw_sock), | |
730 | .init = raw_init, | |
731 | }; | |
732 | ||
733 | static struct can_proto raw_can_proto __read_mostly = { | |
734 | .type = SOCK_RAW, | |
735 | .protocol = CAN_RAW, | |
736 | .capability = -1, | |
737 | .ops = &raw_ops, | |
738 | .prot = &raw_proto, | |
739 | }; | |
740 | ||
741 | static __init int raw_module_init(void) | |
742 | { | |
743 | int err; | |
744 | ||
745 | printk(banner); | |
746 | ||
747 | err = can_proto_register(&raw_can_proto); | |
748 | if (err < 0) | |
749 | printk(KERN_ERR "can: registration of raw protocol failed\n"); | |
750 | ||
751 | return err; | |
752 | } | |
753 | ||
754 | static __exit void raw_module_exit(void) | |
755 | { | |
756 | can_proto_unregister(&raw_can_proto); | |
757 | } | |
758 | ||
759 | module_init(raw_module_init); | |
760 | module_exit(raw_module_exit); |