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> | |
156c2bb9 | 53 | #include <linux/can/skb.h> |
c18ce101 OH |
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 | |
6299b669 | 59 | static __initconst const char banner[] = |
c18ce101 OH |
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>"); | |
b13bb2e9 | 65 | MODULE_ALIAS("can-proto-1"); |
c18ce101 OH |
66 | |
67 | #define MASK_ALL 0 | |
68 | ||
69 | /* | |
70 | * A raw socket has a list of can_filters attached to it, each receiving | |
71 | * the CAN frames matching that filter. If the filter list is empty, | |
72 | * no CAN frames will be received by the socket. The default after | |
73 | * opening the socket, is to have one filter which receives all frames. | |
74 | * The filter list is allocated dynamically with the exception of the | |
75 | * list containing only one item. This common case is optimized by | |
76 | * storing the single filter in dfilter, to avoid using dynamic memory. | |
77 | */ | |
78 | ||
79 | struct raw_sock { | |
80 | struct sock sk; | |
81 | int bound; | |
82 | int ifindex; | |
83 | struct notifier_block notifier; | |
84 | int loopback; | |
85 | int recv_own_msgs; | |
e2d265d3 | 86 | int fd_frames; |
c18ce101 OH |
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 | ||
821047c4 OH |
124 | /* do not pass non-CAN2.0 frames to a legacy socket */ |
125 | if (!ro->fd_frames && oskb->len != CAN_MTU) | |
126 | return; | |
e2d265d3 | 127 | |
1fa17d4b | 128 | /* clone the given skb to be able to enqueue it into the rcv queue */ |
1e55659c | 129 | skb = skb_clone(oskb, GFP_ATOMIC); |
1fa17d4b OH |
130 | if (!skb) |
131 | return; | |
c18ce101 OH |
132 | |
133 | /* | |
134 | * Put the datagram to the queue so that raw_recvmsg() can | |
135 | * get it from there. We need to pass the interface index to | |
136 | * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
137 | * containing the interface index. | |
138 | */ | |
139 | ||
140 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
141 | addr = (struct sockaddr_can *)skb->cb; | |
142 | memset(addr, 0, sizeof(*addr)); | |
143 | addr->can_family = AF_CAN; | |
144 | addr->can_ifindex = skb->dev->ifindex; | |
145 | ||
1e55659c OH |
146 | /* add CAN specific message flags for raw_recvmsg() */ |
147 | pflags = raw_flags(skb); | |
148 | *pflags = 0; | |
149 | if (oskb->sk) | |
150 | *pflags |= MSG_DONTROUTE; | |
151 | if (oskb->sk == sk) | |
152 | *pflags |= MSG_CONFIRM; | |
153 | ||
a219994b | 154 | if (sock_queue_rcv_skb(sk, skb) < 0) |
c18ce101 OH |
155 | kfree_skb(skb); |
156 | } | |
157 | ||
158 | static int raw_enable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 159 | struct can_filter *filter, int count) |
c18ce101 OH |
160 | { |
161 | int err = 0; | |
162 | int i; | |
163 | ||
164 | for (i = 0; i < count; i++) { | |
165 | err = can_rx_register(dev, filter[i].can_id, | |
166 | filter[i].can_mask, | |
167 | raw_rcv, sk, "raw"); | |
168 | if (err) { | |
169 | /* clean up successfully registered filters */ | |
170 | while (--i >= 0) | |
171 | can_rx_unregister(dev, filter[i].can_id, | |
172 | filter[i].can_mask, | |
173 | raw_rcv, sk); | |
174 | break; | |
175 | } | |
176 | } | |
177 | ||
178 | return err; | |
179 | } | |
180 | ||
181 | static int raw_enable_errfilter(struct net_device *dev, struct sock *sk, | |
182 | can_err_mask_t err_mask) | |
183 | { | |
184 | int err = 0; | |
185 | ||
186 | if (err_mask) | |
187 | err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG, | |
188 | raw_rcv, sk, "raw"); | |
189 | ||
190 | return err; | |
191 | } | |
192 | ||
193 | static void raw_disable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 194 | struct can_filter *filter, int count) |
c18ce101 OH |
195 | { |
196 | int i; | |
197 | ||
198 | for (i = 0; i < count; i++) | |
199 | can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask, | |
200 | raw_rcv, sk); | |
201 | } | |
202 | ||
203 | static inline void raw_disable_errfilter(struct net_device *dev, | |
204 | struct sock *sk, | |
205 | can_err_mask_t err_mask) | |
206 | ||
207 | { | |
208 | if (err_mask) | |
209 | can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG, | |
210 | raw_rcv, sk); | |
211 | } | |
212 | ||
213 | static inline void raw_disable_allfilters(struct net_device *dev, | |
214 | struct sock *sk) | |
215 | { | |
216 | struct raw_sock *ro = raw_sk(sk); | |
217 | ||
218 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
219 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
220 | } | |
221 | ||
222 | static int raw_enable_allfilters(struct net_device *dev, struct sock *sk) | |
223 | { | |
224 | struct raw_sock *ro = raw_sk(sk); | |
225 | int err; | |
226 | ||
227 | err = raw_enable_filters(dev, sk, ro->filter, ro->count); | |
228 | if (!err) { | |
229 | err = raw_enable_errfilter(dev, sk, ro->err_mask); | |
230 | if (err) | |
231 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
232 | } | |
233 | ||
234 | return err; | |
235 | } | |
236 | ||
237 | static int raw_notifier(struct notifier_block *nb, | |
351638e7 | 238 | unsigned long msg, void *ptr) |
c18ce101 | 239 | { |
351638e7 | 240 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c18ce101 OH |
241 | struct raw_sock *ro = container_of(nb, struct raw_sock, notifier); |
242 | struct sock *sk = &ro->sk; | |
243 | ||
721499e8 | 244 | if (!net_eq(dev_net(dev), &init_net)) |
c18ce101 OH |
245 | return NOTIFY_DONE; |
246 | ||
247 | if (dev->type != ARPHRD_CAN) | |
248 | return NOTIFY_DONE; | |
249 | ||
250 | if (ro->ifindex != dev->ifindex) | |
251 | return NOTIFY_DONE; | |
252 | ||
253 | switch (msg) { | |
254 | ||
255 | case NETDEV_UNREGISTER: | |
256 | lock_sock(sk); | |
257 | /* remove current filters & unregister */ | |
258 | if (ro->bound) | |
259 | raw_disable_allfilters(dev, sk); | |
260 | ||
261 | if (ro->count > 1) | |
262 | kfree(ro->filter); | |
263 | ||
264 | ro->ifindex = 0; | |
265 | ro->bound = 0; | |
266 | ro->count = 0; | |
267 | release_sock(sk); | |
268 | ||
269 | sk->sk_err = ENODEV; | |
270 | if (!sock_flag(sk, SOCK_DEAD)) | |
271 | sk->sk_error_report(sk); | |
272 | break; | |
273 | ||
274 | case NETDEV_DOWN: | |
275 | sk->sk_err = ENETDOWN; | |
276 | if (!sock_flag(sk, SOCK_DEAD)) | |
277 | sk->sk_error_report(sk); | |
278 | break; | |
279 | } | |
280 | ||
281 | return NOTIFY_DONE; | |
282 | } | |
283 | ||
284 | static int raw_init(struct sock *sk) | |
285 | { | |
286 | struct raw_sock *ro = raw_sk(sk); | |
287 | ||
288 | ro->bound = 0; | |
289 | ro->ifindex = 0; | |
290 | ||
291 | /* set default filter to single entry dfilter */ | |
292 | ro->dfilter.can_id = 0; | |
293 | ro->dfilter.can_mask = MASK_ALL; | |
294 | ro->filter = &ro->dfilter; | |
295 | ro->count = 1; | |
296 | ||
297 | /* set default loopback behaviour */ | |
298 | ro->loopback = 1; | |
299 | ro->recv_own_msgs = 0; | |
e2d265d3 | 300 | ro->fd_frames = 0; |
c18ce101 OH |
301 | |
302 | /* set notifier */ | |
303 | ro->notifier.notifier_call = raw_notifier; | |
304 | ||
305 | register_netdevice_notifier(&ro->notifier); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static int raw_release(struct socket *sock) | |
311 | { | |
312 | struct sock *sk = sock->sk; | |
10022a6c OH |
313 | struct raw_sock *ro; |
314 | ||
315 | if (!sk) | |
316 | return 0; | |
317 | ||
318 | ro = raw_sk(sk); | |
c18ce101 OH |
319 | |
320 | unregister_netdevice_notifier(&ro->notifier); | |
321 | ||
322 | lock_sock(sk); | |
323 | ||
324 | /* remove current filters & unregister */ | |
325 | if (ro->bound) { | |
326 | if (ro->ifindex) { | |
327 | struct net_device *dev; | |
328 | ||
329 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
330 | if (dev) { | |
331 | raw_disable_allfilters(dev, sk); | |
332 | dev_put(dev); | |
333 | } | |
334 | } else | |
335 | raw_disable_allfilters(NULL, sk); | |
336 | } | |
337 | ||
338 | if (ro->count > 1) | |
339 | kfree(ro->filter); | |
340 | ||
341 | ro->ifindex = 0; | |
342 | ro->bound = 0; | |
343 | ro->count = 0; | |
344 | ||
f7e5cc0c LW |
345 | sock_orphan(sk); |
346 | sock->sk = NULL; | |
347 | ||
c18ce101 OH |
348 | release_sock(sk); |
349 | sock_put(sk); | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len) | |
355 | { | |
356 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
357 | struct sock *sk = sock->sk; | |
358 | struct raw_sock *ro = raw_sk(sk); | |
359 | int ifindex; | |
360 | int err = 0; | |
361 | int notify_enetdown = 0; | |
362 | ||
363 | if (len < sizeof(*addr)) | |
364 | return -EINVAL; | |
365 | ||
366 | lock_sock(sk); | |
367 | ||
368 | if (ro->bound && addr->can_ifindex == ro->ifindex) | |
369 | goto out; | |
370 | ||
371 | if (addr->can_ifindex) { | |
372 | struct net_device *dev; | |
373 | ||
374 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
375 | if (!dev) { | |
376 | err = -ENODEV; | |
377 | goto out; | |
378 | } | |
379 | if (dev->type != ARPHRD_CAN) { | |
380 | dev_put(dev); | |
381 | err = -ENODEV; | |
382 | goto out; | |
383 | } | |
384 | if (!(dev->flags & IFF_UP)) | |
385 | notify_enetdown = 1; | |
386 | ||
387 | ifindex = dev->ifindex; | |
388 | ||
389 | /* filters set by default/setsockopt */ | |
390 | err = raw_enable_allfilters(dev, sk); | |
391 | dev_put(dev); | |
c18ce101 OH |
392 | } else { |
393 | ifindex = 0; | |
394 | ||
395 | /* filters set by default/setsockopt */ | |
396 | err = raw_enable_allfilters(NULL, sk); | |
397 | } | |
398 | ||
399 | if (!err) { | |
400 | if (ro->bound) { | |
401 | /* unregister old filters */ | |
402 | if (ro->ifindex) { | |
403 | struct net_device *dev; | |
404 | ||
405 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
406 | if (dev) { | |
407 | raw_disable_allfilters(dev, sk); | |
408 | dev_put(dev); | |
409 | } | |
410 | } else | |
411 | raw_disable_allfilters(NULL, sk); | |
412 | } | |
413 | ro->ifindex = ifindex; | |
414 | ro->bound = 1; | |
415 | } | |
416 | ||
417 | out: | |
418 | release_sock(sk); | |
419 | ||
420 | if (notify_enetdown) { | |
421 | sk->sk_err = ENETDOWN; | |
422 | if (!sock_flag(sk, SOCK_DEAD)) | |
423 | sk->sk_error_report(sk); | |
424 | } | |
425 | ||
426 | return err; | |
427 | } | |
428 | ||
429 | static int raw_getname(struct socket *sock, struct sockaddr *uaddr, | |
430 | int *len, int peer) | |
431 | { | |
432 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
433 | struct sock *sk = sock->sk; | |
434 | struct raw_sock *ro = raw_sk(sk); | |
435 | ||
436 | if (peer) | |
437 | return -EOPNOTSUPP; | |
438 | ||
e84b90ae | 439 | memset(addr, 0, sizeof(*addr)); |
c18ce101 OH |
440 | addr->can_family = AF_CAN; |
441 | addr->can_ifindex = ro->ifindex; | |
442 | ||
443 | *len = sizeof(*addr); | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | static int raw_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 449 | char __user *optval, unsigned int optlen) |
c18ce101 OH |
450 | { |
451 | struct sock *sk = sock->sk; | |
452 | struct raw_sock *ro = raw_sk(sk); | |
453 | struct can_filter *filter = NULL; /* dyn. alloc'ed filters */ | |
454 | struct can_filter sfilter; /* single filter */ | |
455 | struct net_device *dev = NULL; | |
456 | can_err_mask_t err_mask = 0; | |
457 | int count = 0; | |
458 | int err = 0; | |
459 | ||
460 | if (level != SOL_CAN_RAW) | |
461 | return -EINVAL; | |
c18ce101 OH |
462 | |
463 | switch (optname) { | |
464 | ||
465 | case CAN_RAW_FILTER: | |
466 | if (optlen % sizeof(struct can_filter) != 0) | |
467 | return -EINVAL; | |
468 | ||
469 | count = optlen / sizeof(struct can_filter); | |
470 | ||
471 | if (count > 1) { | |
472 | /* filter does not fit into dfilter => alloc space */ | |
16dff918 JL |
473 | filter = memdup_user(optval, optlen); |
474 | if (IS_ERR(filter)) | |
475 | return PTR_ERR(filter); | |
c18ce101 | 476 | } else if (count == 1) { |
4ffa8701 | 477 | if (copy_from_user(&sfilter, optval, sizeof(sfilter))) |
3f91bd42 | 478 | return -EFAULT; |
c18ce101 OH |
479 | } |
480 | ||
481 | lock_sock(sk); | |
482 | ||
483 | if (ro->bound && ro->ifindex) | |
484 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
485 | ||
486 | if (ro->bound) { | |
487 | /* (try to) register the new filters */ | |
488 | if (count == 1) | |
489 | err = raw_enable_filters(dev, sk, &sfilter, 1); | |
490 | else | |
491 | err = raw_enable_filters(dev, sk, filter, | |
492 | count); | |
493 | if (err) { | |
494 | if (count > 1) | |
495 | kfree(filter); | |
c18ce101 OH |
496 | goto out_fil; |
497 | } | |
498 | ||
499 | /* remove old filter registrations */ | |
500 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
501 | } | |
502 | ||
503 | /* remove old filter space */ | |
504 | if (ro->count > 1) | |
505 | kfree(ro->filter); | |
506 | ||
507 | /* link new filters to the socket */ | |
508 | if (count == 1) { | |
509 | /* copy filter data for single filter */ | |
510 | ro->dfilter = sfilter; | |
511 | filter = &ro->dfilter; | |
512 | } | |
513 | ro->filter = filter; | |
514 | ro->count = count; | |
515 | ||
516 | out_fil: | |
517 | if (dev) | |
518 | dev_put(dev); | |
519 | ||
520 | release_sock(sk); | |
521 | ||
522 | break; | |
523 | ||
524 | case CAN_RAW_ERR_FILTER: | |
525 | if (optlen != sizeof(err_mask)) | |
526 | return -EINVAL; | |
527 | ||
3f91bd42 SR |
528 | if (copy_from_user(&err_mask, optval, optlen)) |
529 | return -EFAULT; | |
c18ce101 OH |
530 | |
531 | err_mask &= CAN_ERR_MASK; | |
532 | ||
533 | lock_sock(sk); | |
534 | ||
535 | if (ro->bound && ro->ifindex) | |
536 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
537 | ||
538 | /* remove current error mask */ | |
539 | if (ro->bound) { | |
540 | /* (try to) register the new err_mask */ | |
541 | err = raw_enable_errfilter(dev, sk, err_mask); | |
542 | ||
543 | if (err) | |
544 | goto out_err; | |
545 | ||
546 | /* remove old err_mask registration */ | |
547 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
548 | } | |
549 | ||
550 | /* link new err_mask to the socket */ | |
551 | ro->err_mask = err_mask; | |
552 | ||
553 | out_err: | |
554 | if (dev) | |
555 | dev_put(dev); | |
556 | ||
557 | release_sock(sk); | |
558 | ||
559 | break; | |
560 | ||
561 | case CAN_RAW_LOOPBACK: | |
562 | if (optlen != sizeof(ro->loopback)) | |
563 | return -EINVAL; | |
564 | ||
3f91bd42 SR |
565 | if (copy_from_user(&ro->loopback, optval, optlen)) |
566 | return -EFAULT; | |
c18ce101 OH |
567 | |
568 | break; | |
569 | ||
570 | case CAN_RAW_RECV_OWN_MSGS: | |
571 | if (optlen != sizeof(ro->recv_own_msgs)) | |
572 | return -EINVAL; | |
573 | ||
3f91bd42 SR |
574 | if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) |
575 | return -EFAULT; | |
c18ce101 OH |
576 | |
577 | break; | |
578 | ||
e2d265d3 OH |
579 | case CAN_RAW_FD_FRAMES: |
580 | if (optlen != sizeof(ro->fd_frames)) | |
581 | return -EINVAL; | |
582 | ||
583 | if (copy_from_user(&ro->fd_frames, optval, optlen)) | |
584 | return -EFAULT; | |
585 | ||
586 | break; | |
587 | ||
c18ce101 OH |
588 | default: |
589 | return -ENOPROTOOPT; | |
590 | } | |
591 | return err; | |
592 | } | |
593 | ||
594 | static int raw_getsockopt(struct socket *sock, int level, int optname, | |
595 | char __user *optval, int __user *optlen) | |
596 | { | |
597 | struct sock *sk = sock->sk; | |
598 | struct raw_sock *ro = raw_sk(sk); | |
599 | int len; | |
600 | void *val; | |
601 | int err = 0; | |
602 | ||
603 | if (level != SOL_CAN_RAW) | |
604 | return -EINVAL; | |
605 | if (get_user(len, optlen)) | |
606 | return -EFAULT; | |
607 | if (len < 0) | |
608 | return -EINVAL; | |
609 | ||
610 | switch (optname) { | |
611 | ||
612 | case CAN_RAW_FILTER: | |
613 | lock_sock(sk); | |
614 | if (ro->count > 0) { | |
615 | int fsize = ro->count * sizeof(struct can_filter); | |
616 | if (len > fsize) | |
617 | len = fsize; | |
653252c2 PE |
618 | if (copy_to_user(optval, ro->filter, len)) |
619 | err = -EFAULT; | |
c18ce101 OH |
620 | } else |
621 | len = 0; | |
622 | release_sock(sk); | |
623 | ||
624 | if (!err) | |
625 | err = put_user(len, optlen); | |
626 | return err; | |
627 | ||
628 | case CAN_RAW_ERR_FILTER: | |
629 | if (len > sizeof(can_err_mask_t)) | |
630 | len = sizeof(can_err_mask_t); | |
631 | val = &ro->err_mask; | |
632 | break; | |
633 | ||
634 | case CAN_RAW_LOOPBACK: | |
635 | if (len > sizeof(int)) | |
636 | len = sizeof(int); | |
637 | val = &ro->loopback; | |
638 | break; | |
639 | ||
640 | case CAN_RAW_RECV_OWN_MSGS: | |
641 | if (len > sizeof(int)) | |
642 | len = sizeof(int); | |
643 | val = &ro->recv_own_msgs; | |
644 | break; | |
645 | ||
e2d265d3 OH |
646 | case CAN_RAW_FD_FRAMES: |
647 | if (len > sizeof(int)) | |
648 | len = sizeof(int); | |
649 | val = &ro->fd_frames; | |
650 | break; | |
651 | ||
c18ce101 OH |
652 | default: |
653 | return -ENOPROTOOPT; | |
654 | } | |
655 | ||
656 | if (put_user(len, optlen)) | |
657 | return -EFAULT; | |
658 | if (copy_to_user(optval, val, len)) | |
659 | return -EFAULT; | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, | |
664 | struct msghdr *msg, size_t size) | |
665 | { | |
666 | struct sock *sk = sock->sk; | |
667 | struct raw_sock *ro = raw_sk(sk); | |
668 | struct sk_buff *skb; | |
669 | struct net_device *dev; | |
670 | int ifindex; | |
671 | int err; | |
672 | ||
673 | if (msg->msg_name) { | |
342dfc30 | 674 | DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); |
c18ce101 | 675 | |
5e507328 KVD |
676 | if (msg->msg_namelen < sizeof(*addr)) |
677 | return -EINVAL; | |
678 | ||
c18ce101 OH |
679 | if (addr->can_family != AF_CAN) |
680 | return -EINVAL; | |
681 | ||
682 | ifindex = addr->can_ifindex; | |
683 | } else | |
684 | ifindex = ro->ifindex; | |
685 | ||
e2d265d3 OH |
686 | if (ro->fd_frames) { |
687 | if (unlikely(size != CANFD_MTU && size != CAN_MTU)) | |
688 | return -EINVAL; | |
689 | } else { | |
690 | if (unlikely(size != CAN_MTU)) | |
691 | return -EINVAL; | |
692 | } | |
7f2d38eb | 693 | |
c18ce101 OH |
694 | dev = dev_get_by_index(&init_net, ifindex); |
695 | if (!dev) | |
696 | return -ENXIO; | |
697 | ||
156c2bb9 OH |
698 | skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv), |
699 | msg->msg_flags & MSG_DONTWAIT, &err); | |
ebad5c09 IJ |
700 | if (!skb) |
701 | goto put_dev; | |
c18ce101 | 702 | |
2bf3440d OH |
703 | can_skb_reserve(skb); |
704 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
156c2bb9 | 705 | |
6ce8e9ce | 706 | err = memcpy_from_msg(skb_put(skb, size), msg, size); |
51f31cab PO |
707 | if (err < 0) |
708 | goto free_skb; | |
bf84a010 DB |
709 | |
710 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); | |
cff0d6e6 | 711 | |
c18ce101 OH |
712 | skb->dev = dev; |
713 | skb->sk = sk; | |
bb5ecb0c | 714 | skb->priority = sk->sk_priority; |
c18ce101 OH |
715 | |
716 | err = can_send(skb, ro->loopback); | |
717 | ||
718 | dev_put(dev); | |
719 | ||
720 | if (err) | |
ebad5c09 | 721 | goto send_failed; |
c18ce101 OH |
722 | |
723 | return size; | |
ebad5c09 IJ |
724 | |
725 | free_skb: | |
726 | kfree_skb(skb); | |
727 | put_dev: | |
728 | dev_put(dev); | |
729 | send_failed: | |
730 | return err; | |
c18ce101 OH |
731 | } |
732 | ||
733 | static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, | |
734 | struct msghdr *msg, size_t size, int flags) | |
735 | { | |
736 | struct sock *sk = sock->sk; | |
737 | struct sk_buff *skb; | |
a219994b | 738 | int err = 0; |
c18ce101 OH |
739 | int noblock; |
740 | ||
741 | noblock = flags & MSG_DONTWAIT; | |
742 | flags &= ~MSG_DONTWAIT; | |
743 | ||
a219994b | 744 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
c18ce101 | 745 | if (!skb) |
a219994b | 746 | return err; |
c18ce101 | 747 | |
821047c4 | 748 | if (size < skb->len) |
c18ce101 OH |
749 | msg->msg_flags |= MSG_TRUNC; |
750 | else | |
821047c4 | 751 | size = skb->len; |
c18ce101 | 752 | |
a219994b UT |
753 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); |
754 | if (err < 0) { | |
c18ce101 | 755 | skb_free_datagram(sk, skb); |
a219994b | 756 | return err; |
c18ce101 OH |
757 | } |
758 | ||
3b885787 | 759 | sock_recv_ts_and_drops(msg, sk, skb); |
c18ce101 OH |
760 | |
761 | if (msg->msg_name) { | |
342dfc30 | 762 | __sockaddr_check_size(sizeof(struct sockaddr_can)); |
c18ce101 OH |
763 | msg->msg_namelen = sizeof(struct sockaddr_can); |
764 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
765 | } | |
766 | ||
1e55659c OH |
767 | /* assign the flags that have been recorded in raw_rcv() */ |
768 | msg->msg_flags |= *(raw_flags(skb)); | |
769 | ||
c18ce101 OH |
770 | skb_free_datagram(sk, skb); |
771 | ||
772 | return size; | |
773 | } | |
774 | ||
53914b67 | 775 | static const struct proto_ops raw_ops = { |
c18ce101 OH |
776 | .family = PF_CAN, |
777 | .release = raw_release, | |
778 | .bind = raw_bind, | |
779 | .connect = sock_no_connect, | |
780 | .socketpair = sock_no_socketpair, | |
781 | .accept = sock_no_accept, | |
782 | .getname = raw_getname, | |
783 | .poll = datagram_poll, | |
53914b67 | 784 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
c18ce101 OH |
785 | .listen = sock_no_listen, |
786 | .shutdown = sock_no_shutdown, | |
787 | .setsockopt = raw_setsockopt, | |
788 | .getsockopt = raw_getsockopt, | |
789 | .sendmsg = raw_sendmsg, | |
790 | .recvmsg = raw_recvmsg, | |
791 | .mmap = sock_no_mmap, | |
792 | .sendpage = sock_no_sendpage, | |
793 | }; | |
794 | ||
795 | static struct proto raw_proto __read_mostly = { | |
796 | .name = "CAN_RAW", | |
797 | .owner = THIS_MODULE, | |
798 | .obj_size = sizeof(struct raw_sock), | |
799 | .init = raw_init, | |
800 | }; | |
801 | ||
1650629d | 802 | static const struct can_proto raw_can_proto = { |
c18ce101 OH |
803 | .type = SOCK_RAW, |
804 | .protocol = CAN_RAW, | |
c18ce101 OH |
805 | .ops = &raw_ops, |
806 | .prot = &raw_proto, | |
807 | }; | |
808 | ||
809 | static __init int raw_module_init(void) | |
810 | { | |
811 | int err; | |
812 | ||
813 | printk(banner); | |
814 | ||
815 | err = can_proto_register(&raw_can_proto); | |
816 | if (err < 0) | |
817 | printk(KERN_ERR "can: registration of raw protocol failed\n"); | |
818 | ||
819 | return err; | |
820 | } | |
821 | ||
822 | static __exit void raw_module_exit(void) | |
823 | { | |
824 | can_proto_unregister(&raw_can_proto); | |
825 | } | |
826 | ||
827 | module_init(raw_module_init); | |
828 | module_exit(raw_module_exit); |