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 | * | |
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 | ||
e2d265d3 OH |
124 | /* do not pass frames with DLC > 8 to a legacy socket */ |
125 | if (!ro->fd_frames) { | |
126 | struct canfd_frame *cfd = (struct canfd_frame *)oskb->data; | |
127 | ||
128 | if (unlikely(cfd->len > CAN_MAX_DLEN)) | |
129 | return; | |
130 | } | |
131 | ||
1fa17d4b | 132 | /* clone the given skb to be able to enqueue it into the rcv queue */ |
1e55659c | 133 | skb = skb_clone(oskb, GFP_ATOMIC); |
1fa17d4b OH |
134 | if (!skb) |
135 | return; | |
c18ce101 OH |
136 | |
137 | /* | |
138 | * Put the datagram to the queue so that raw_recvmsg() can | |
139 | * get it from there. We need to pass the interface index to | |
140 | * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
141 | * containing the interface index. | |
142 | */ | |
143 | ||
144 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
145 | addr = (struct sockaddr_can *)skb->cb; | |
146 | memset(addr, 0, sizeof(*addr)); | |
147 | addr->can_family = AF_CAN; | |
148 | addr->can_ifindex = skb->dev->ifindex; | |
149 | ||
1e55659c OH |
150 | /* add CAN specific message flags for raw_recvmsg() */ |
151 | pflags = raw_flags(skb); | |
152 | *pflags = 0; | |
153 | if (oskb->sk) | |
154 | *pflags |= MSG_DONTROUTE; | |
155 | if (oskb->sk == sk) | |
156 | *pflags |= MSG_CONFIRM; | |
157 | ||
a219994b | 158 | if (sock_queue_rcv_skb(sk, skb) < 0) |
c18ce101 OH |
159 | kfree_skb(skb); |
160 | } | |
161 | ||
162 | static int raw_enable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 163 | struct can_filter *filter, int count) |
c18ce101 OH |
164 | { |
165 | int err = 0; | |
166 | int i; | |
167 | ||
168 | for (i = 0; i < count; i++) { | |
169 | err = can_rx_register(dev, filter[i].can_id, | |
170 | filter[i].can_mask, | |
171 | raw_rcv, sk, "raw"); | |
172 | if (err) { | |
173 | /* clean up successfully registered filters */ | |
174 | while (--i >= 0) | |
175 | can_rx_unregister(dev, filter[i].can_id, | |
176 | filter[i].can_mask, | |
177 | raw_rcv, sk); | |
178 | break; | |
179 | } | |
180 | } | |
181 | ||
182 | return err; | |
183 | } | |
184 | ||
185 | static int raw_enable_errfilter(struct net_device *dev, struct sock *sk, | |
186 | can_err_mask_t err_mask) | |
187 | { | |
188 | int err = 0; | |
189 | ||
190 | if (err_mask) | |
191 | err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG, | |
192 | raw_rcv, sk, "raw"); | |
193 | ||
194 | return err; | |
195 | } | |
196 | ||
197 | static void raw_disable_filters(struct net_device *dev, struct sock *sk, | |
a219994b | 198 | struct can_filter *filter, int count) |
c18ce101 OH |
199 | { |
200 | int i; | |
201 | ||
202 | for (i = 0; i < count; i++) | |
203 | can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask, | |
204 | raw_rcv, sk); | |
205 | } | |
206 | ||
207 | static inline void raw_disable_errfilter(struct net_device *dev, | |
208 | struct sock *sk, | |
209 | can_err_mask_t err_mask) | |
210 | ||
211 | { | |
212 | if (err_mask) | |
213 | can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG, | |
214 | raw_rcv, sk); | |
215 | } | |
216 | ||
217 | static inline void raw_disable_allfilters(struct net_device *dev, | |
218 | struct sock *sk) | |
219 | { | |
220 | struct raw_sock *ro = raw_sk(sk); | |
221 | ||
222 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
223 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
224 | } | |
225 | ||
226 | static int raw_enable_allfilters(struct net_device *dev, struct sock *sk) | |
227 | { | |
228 | struct raw_sock *ro = raw_sk(sk); | |
229 | int err; | |
230 | ||
231 | err = raw_enable_filters(dev, sk, ro->filter, ro->count); | |
232 | if (!err) { | |
233 | err = raw_enable_errfilter(dev, sk, ro->err_mask); | |
234 | if (err) | |
235 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
236 | } | |
237 | ||
238 | return err; | |
239 | } | |
240 | ||
241 | static int raw_notifier(struct notifier_block *nb, | |
242 | unsigned long msg, void *data) | |
243 | { | |
244 | struct net_device *dev = (struct net_device *)data; | |
245 | struct raw_sock *ro = container_of(nb, struct raw_sock, notifier); | |
246 | struct sock *sk = &ro->sk; | |
247 | ||
721499e8 | 248 | if (!net_eq(dev_net(dev), &init_net)) |
c18ce101 OH |
249 | return NOTIFY_DONE; |
250 | ||
251 | if (dev->type != ARPHRD_CAN) | |
252 | return NOTIFY_DONE; | |
253 | ||
254 | if (ro->ifindex != dev->ifindex) | |
255 | return NOTIFY_DONE; | |
256 | ||
257 | switch (msg) { | |
258 | ||
259 | case NETDEV_UNREGISTER: | |
260 | lock_sock(sk); | |
261 | /* remove current filters & unregister */ | |
262 | if (ro->bound) | |
263 | raw_disable_allfilters(dev, sk); | |
264 | ||
265 | if (ro->count > 1) | |
266 | kfree(ro->filter); | |
267 | ||
268 | ro->ifindex = 0; | |
269 | ro->bound = 0; | |
270 | ro->count = 0; | |
271 | release_sock(sk); | |
272 | ||
273 | sk->sk_err = ENODEV; | |
274 | if (!sock_flag(sk, SOCK_DEAD)) | |
275 | sk->sk_error_report(sk); | |
276 | break; | |
277 | ||
278 | case NETDEV_DOWN: | |
279 | sk->sk_err = ENETDOWN; | |
280 | if (!sock_flag(sk, SOCK_DEAD)) | |
281 | sk->sk_error_report(sk); | |
282 | break; | |
283 | } | |
284 | ||
285 | return NOTIFY_DONE; | |
286 | } | |
287 | ||
288 | static int raw_init(struct sock *sk) | |
289 | { | |
290 | struct raw_sock *ro = raw_sk(sk); | |
291 | ||
292 | ro->bound = 0; | |
293 | ro->ifindex = 0; | |
294 | ||
295 | /* set default filter to single entry dfilter */ | |
296 | ro->dfilter.can_id = 0; | |
297 | ro->dfilter.can_mask = MASK_ALL; | |
298 | ro->filter = &ro->dfilter; | |
299 | ro->count = 1; | |
300 | ||
301 | /* set default loopback behaviour */ | |
302 | ro->loopback = 1; | |
303 | ro->recv_own_msgs = 0; | |
e2d265d3 | 304 | ro->fd_frames = 0; |
c18ce101 OH |
305 | |
306 | /* set notifier */ | |
307 | ro->notifier.notifier_call = raw_notifier; | |
308 | ||
309 | register_netdevice_notifier(&ro->notifier); | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | static int raw_release(struct socket *sock) | |
315 | { | |
316 | struct sock *sk = sock->sk; | |
10022a6c OH |
317 | struct raw_sock *ro; |
318 | ||
319 | if (!sk) | |
320 | return 0; | |
321 | ||
322 | ro = raw_sk(sk); | |
c18ce101 OH |
323 | |
324 | unregister_netdevice_notifier(&ro->notifier); | |
325 | ||
326 | lock_sock(sk); | |
327 | ||
328 | /* remove current filters & unregister */ | |
329 | if (ro->bound) { | |
330 | if (ro->ifindex) { | |
331 | struct net_device *dev; | |
332 | ||
333 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
334 | if (dev) { | |
335 | raw_disable_allfilters(dev, sk); | |
336 | dev_put(dev); | |
337 | } | |
338 | } else | |
339 | raw_disable_allfilters(NULL, sk); | |
340 | } | |
341 | ||
342 | if (ro->count > 1) | |
343 | kfree(ro->filter); | |
344 | ||
345 | ro->ifindex = 0; | |
346 | ro->bound = 0; | |
347 | ro->count = 0; | |
348 | ||
f7e5cc0c LW |
349 | sock_orphan(sk); |
350 | sock->sk = NULL; | |
351 | ||
c18ce101 OH |
352 | release_sock(sk); |
353 | sock_put(sk); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len) | |
359 | { | |
360 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
361 | struct sock *sk = sock->sk; | |
362 | struct raw_sock *ro = raw_sk(sk); | |
363 | int ifindex; | |
364 | int err = 0; | |
365 | int notify_enetdown = 0; | |
366 | ||
367 | if (len < sizeof(*addr)) | |
368 | return -EINVAL; | |
369 | ||
370 | lock_sock(sk); | |
371 | ||
372 | if (ro->bound && addr->can_ifindex == ro->ifindex) | |
373 | goto out; | |
374 | ||
375 | if (addr->can_ifindex) { | |
376 | struct net_device *dev; | |
377 | ||
378 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
379 | if (!dev) { | |
380 | err = -ENODEV; | |
381 | goto out; | |
382 | } | |
383 | if (dev->type != ARPHRD_CAN) { | |
384 | dev_put(dev); | |
385 | err = -ENODEV; | |
386 | goto out; | |
387 | } | |
388 | if (!(dev->flags & IFF_UP)) | |
389 | notify_enetdown = 1; | |
390 | ||
391 | ifindex = dev->ifindex; | |
392 | ||
393 | /* filters set by default/setsockopt */ | |
394 | err = raw_enable_allfilters(dev, sk); | |
395 | dev_put(dev); | |
c18ce101 OH |
396 | } else { |
397 | ifindex = 0; | |
398 | ||
399 | /* filters set by default/setsockopt */ | |
400 | err = raw_enable_allfilters(NULL, sk); | |
401 | } | |
402 | ||
403 | if (!err) { | |
404 | if (ro->bound) { | |
405 | /* unregister old filters */ | |
406 | if (ro->ifindex) { | |
407 | struct net_device *dev; | |
408 | ||
409 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
410 | if (dev) { | |
411 | raw_disable_allfilters(dev, sk); | |
412 | dev_put(dev); | |
413 | } | |
414 | } else | |
415 | raw_disable_allfilters(NULL, sk); | |
416 | } | |
417 | ro->ifindex = ifindex; | |
418 | ro->bound = 1; | |
419 | } | |
420 | ||
421 | out: | |
422 | release_sock(sk); | |
423 | ||
424 | if (notify_enetdown) { | |
425 | sk->sk_err = ENETDOWN; | |
426 | if (!sock_flag(sk, SOCK_DEAD)) | |
427 | sk->sk_error_report(sk); | |
428 | } | |
429 | ||
430 | return err; | |
431 | } | |
432 | ||
433 | static int raw_getname(struct socket *sock, struct sockaddr *uaddr, | |
434 | int *len, int peer) | |
435 | { | |
436 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
437 | struct sock *sk = sock->sk; | |
438 | struct raw_sock *ro = raw_sk(sk); | |
439 | ||
440 | if (peer) | |
441 | return -EOPNOTSUPP; | |
442 | ||
e84b90ae | 443 | memset(addr, 0, sizeof(*addr)); |
c18ce101 OH |
444 | addr->can_family = AF_CAN; |
445 | addr->can_ifindex = ro->ifindex; | |
446 | ||
447 | *len = sizeof(*addr); | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static int raw_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 453 | char __user *optval, unsigned int optlen) |
c18ce101 OH |
454 | { |
455 | struct sock *sk = sock->sk; | |
456 | struct raw_sock *ro = raw_sk(sk); | |
457 | struct can_filter *filter = NULL; /* dyn. alloc'ed filters */ | |
458 | struct can_filter sfilter; /* single filter */ | |
459 | struct net_device *dev = NULL; | |
460 | can_err_mask_t err_mask = 0; | |
461 | int count = 0; | |
462 | int err = 0; | |
463 | ||
464 | if (level != SOL_CAN_RAW) | |
465 | return -EINVAL; | |
c18ce101 OH |
466 | |
467 | switch (optname) { | |
468 | ||
469 | case CAN_RAW_FILTER: | |
470 | if (optlen % sizeof(struct can_filter) != 0) | |
471 | return -EINVAL; | |
472 | ||
473 | count = optlen / sizeof(struct can_filter); | |
474 | ||
475 | if (count > 1) { | |
476 | /* filter does not fit into dfilter => alloc space */ | |
16dff918 JL |
477 | filter = memdup_user(optval, optlen); |
478 | if (IS_ERR(filter)) | |
479 | return PTR_ERR(filter); | |
c18ce101 | 480 | } else if (count == 1) { |
4ffa8701 | 481 | if (copy_from_user(&sfilter, optval, sizeof(sfilter))) |
3f91bd42 | 482 | return -EFAULT; |
c18ce101 OH |
483 | } |
484 | ||
485 | lock_sock(sk); | |
486 | ||
487 | if (ro->bound && ro->ifindex) | |
488 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
489 | ||
490 | if (ro->bound) { | |
491 | /* (try to) register the new filters */ | |
492 | if (count == 1) | |
493 | err = raw_enable_filters(dev, sk, &sfilter, 1); | |
494 | else | |
495 | err = raw_enable_filters(dev, sk, filter, | |
496 | count); | |
497 | if (err) { | |
498 | if (count > 1) | |
499 | kfree(filter); | |
c18ce101 OH |
500 | goto out_fil; |
501 | } | |
502 | ||
503 | /* remove old filter registrations */ | |
504 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
505 | } | |
506 | ||
507 | /* remove old filter space */ | |
508 | if (ro->count > 1) | |
509 | kfree(ro->filter); | |
510 | ||
511 | /* link new filters to the socket */ | |
512 | if (count == 1) { | |
513 | /* copy filter data for single filter */ | |
514 | ro->dfilter = sfilter; | |
515 | filter = &ro->dfilter; | |
516 | } | |
517 | ro->filter = filter; | |
518 | ro->count = count; | |
519 | ||
520 | out_fil: | |
521 | if (dev) | |
522 | dev_put(dev); | |
523 | ||
524 | release_sock(sk); | |
525 | ||
526 | break; | |
527 | ||
528 | case CAN_RAW_ERR_FILTER: | |
529 | if (optlen != sizeof(err_mask)) | |
530 | return -EINVAL; | |
531 | ||
3f91bd42 SR |
532 | if (copy_from_user(&err_mask, optval, optlen)) |
533 | return -EFAULT; | |
c18ce101 OH |
534 | |
535 | err_mask &= CAN_ERR_MASK; | |
536 | ||
537 | lock_sock(sk); | |
538 | ||
539 | if (ro->bound && ro->ifindex) | |
540 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
541 | ||
542 | /* remove current error mask */ | |
543 | if (ro->bound) { | |
544 | /* (try to) register the new err_mask */ | |
545 | err = raw_enable_errfilter(dev, sk, err_mask); | |
546 | ||
547 | if (err) | |
548 | goto out_err; | |
549 | ||
550 | /* remove old err_mask registration */ | |
551 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
552 | } | |
553 | ||
554 | /* link new err_mask to the socket */ | |
555 | ro->err_mask = err_mask; | |
556 | ||
557 | out_err: | |
558 | if (dev) | |
559 | dev_put(dev); | |
560 | ||
561 | release_sock(sk); | |
562 | ||
563 | break; | |
564 | ||
565 | case CAN_RAW_LOOPBACK: | |
566 | if (optlen != sizeof(ro->loopback)) | |
567 | return -EINVAL; | |
568 | ||
3f91bd42 SR |
569 | if (copy_from_user(&ro->loopback, optval, optlen)) |
570 | return -EFAULT; | |
c18ce101 OH |
571 | |
572 | break; | |
573 | ||
574 | case CAN_RAW_RECV_OWN_MSGS: | |
575 | if (optlen != sizeof(ro->recv_own_msgs)) | |
576 | return -EINVAL; | |
577 | ||
3f91bd42 SR |
578 | if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) |
579 | return -EFAULT; | |
c18ce101 OH |
580 | |
581 | break; | |
582 | ||
e2d265d3 OH |
583 | case CAN_RAW_FD_FRAMES: |
584 | if (optlen != sizeof(ro->fd_frames)) | |
585 | return -EINVAL; | |
586 | ||
587 | if (copy_from_user(&ro->fd_frames, optval, optlen)) | |
588 | return -EFAULT; | |
589 | ||
590 | break; | |
591 | ||
c18ce101 OH |
592 | default: |
593 | return -ENOPROTOOPT; | |
594 | } | |
595 | return err; | |
596 | } | |
597 | ||
598 | static int raw_getsockopt(struct socket *sock, int level, int optname, | |
599 | char __user *optval, int __user *optlen) | |
600 | { | |
601 | struct sock *sk = sock->sk; | |
602 | struct raw_sock *ro = raw_sk(sk); | |
603 | int len; | |
604 | void *val; | |
605 | int err = 0; | |
606 | ||
607 | if (level != SOL_CAN_RAW) | |
608 | return -EINVAL; | |
609 | if (get_user(len, optlen)) | |
610 | return -EFAULT; | |
611 | if (len < 0) | |
612 | return -EINVAL; | |
613 | ||
614 | switch (optname) { | |
615 | ||
616 | case CAN_RAW_FILTER: | |
617 | lock_sock(sk); | |
618 | if (ro->count > 0) { | |
619 | int fsize = ro->count * sizeof(struct can_filter); | |
620 | if (len > fsize) | |
621 | len = fsize; | |
653252c2 PE |
622 | if (copy_to_user(optval, ro->filter, len)) |
623 | err = -EFAULT; | |
c18ce101 OH |
624 | } else |
625 | len = 0; | |
626 | release_sock(sk); | |
627 | ||
628 | if (!err) | |
629 | err = put_user(len, optlen); | |
630 | return err; | |
631 | ||
632 | case CAN_RAW_ERR_FILTER: | |
633 | if (len > sizeof(can_err_mask_t)) | |
634 | len = sizeof(can_err_mask_t); | |
635 | val = &ro->err_mask; | |
636 | break; | |
637 | ||
638 | case CAN_RAW_LOOPBACK: | |
639 | if (len > sizeof(int)) | |
640 | len = sizeof(int); | |
641 | val = &ro->loopback; | |
642 | break; | |
643 | ||
644 | case CAN_RAW_RECV_OWN_MSGS: | |
645 | if (len > sizeof(int)) | |
646 | len = sizeof(int); | |
647 | val = &ro->recv_own_msgs; | |
648 | break; | |
649 | ||
e2d265d3 OH |
650 | case CAN_RAW_FD_FRAMES: |
651 | if (len > sizeof(int)) | |
652 | len = sizeof(int); | |
653 | val = &ro->fd_frames; | |
654 | break; | |
655 | ||
c18ce101 OH |
656 | default: |
657 | return -ENOPROTOOPT; | |
658 | } | |
659 | ||
660 | if (put_user(len, optlen)) | |
661 | return -EFAULT; | |
662 | if (copy_to_user(optval, val, len)) | |
663 | return -EFAULT; | |
664 | return 0; | |
665 | } | |
666 | ||
667 | static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, | |
668 | struct msghdr *msg, size_t size) | |
669 | { | |
670 | struct sock *sk = sock->sk; | |
671 | struct raw_sock *ro = raw_sk(sk); | |
672 | struct sk_buff *skb; | |
673 | struct net_device *dev; | |
674 | int ifindex; | |
675 | int err; | |
676 | ||
677 | if (msg->msg_name) { | |
678 | struct sockaddr_can *addr = | |
679 | (struct sockaddr_can *)msg->msg_name; | |
680 | ||
5e507328 KVD |
681 | if (msg->msg_namelen < sizeof(*addr)) |
682 | return -EINVAL; | |
683 | ||
c18ce101 OH |
684 | if (addr->can_family != AF_CAN) |
685 | return -EINVAL; | |
686 | ||
687 | ifindex = addr->can_ifindex; | |
688 | } else | |
689 | ifindex = ro->ifindex; | |
690 | ||
e2d265d3 OH |
691 | if (ro->fd_frames) { |
692 | if (unlikely(size != CANFD_MTU && size != CAN_MTU)) | |
693 | return -EINVAL; | |
694 | } else { | |
695 | if (unlikely(size != CAN_MTU)) | |
696 | return -EINVAL; | |
697 | } | |
7f2d38eb | 698 | |
c18ce101 OH |
699 | dev = dev_get_by_index(&init_net, ifindex); |
700 | if (!dev) | |
701 | return -ENXIO; | |
702 | ||
156c2bb9 OH |
703 | skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv), |
704 | msg->msg_flags & MSG_DONTWAIT, &err); | |
ebad5c09 IJ |
705 | if (!skb) |
706 | goto put_dev; | |
c18ce101 | 707 | |
156c2bb9 OH |
708 | skb_reserve(skb, sizeof(struct can_skb_priv)); |
709 | ((struct can_skb_priv *)(skb->head))->ifindex = dev->ifindex; | |
710 | ||
c18ce101 | 711 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
51f31cab PO |
712 | if (err < 0) |
713 | goto free_skb; | |
2244d07b | 714 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ebad5c09 IJ |
715 | if (err < 0) |
716 | goto free_skb; | |
cff0d6e6 | 717 | |
c18ce101 OH |
718 | skb->dev = dev; |
719 | skb->sk = sk; | |
720 | ||
721 | err = can_send(skb, ro->loopback); | |
722 | ||
723 | dev_put(dev); | |
724 | ||
725 | if (err) | |
ebad5c09 | 726 | goto send_failed; |
c18ce101 OH |
727 | |
728 | return size; | |
ebad5c09 IJ |
729 | |
730 | free_skb: | |
731 | kfree_skb(skb); | |
732 | put_dev: | |
733 | dev_put(dev); | |
734 | send_failed: | |
735 | return err; | |
c18ce101 OH |
736 | } |
737 | ||
738 | static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, | |
739 | struct msghdr *msg, size_t size, int flags) | |
740 | { | |
741 | struct sock *sk = sock->sk; | |
e2d265d3 | 742 | struct raw_sock *ro = raw_sk(sk); |
c18ce101 | 743 | struct sk_buff *skb; |
e2d265d3 | 744 | int rxmtu; |
a219994b | 745 | int err = 0; |
c18ce101 OH |
746 | int noblock; |
747 | ||
748 | noblock = flags & MSG_DONTWAIT; | |
749 | flags &= ~MSG_DONTWAIT; | |
750 | ||
a219994b | 751 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
c18ce101 | 752 | if (!skb) |
a219994b | 753 | return err; |
c18ce101 | 754 | |
e2d265d3 OH |
755 | /* |
756 | * when serving a legacy socket the DLC <= 8 is already checked inside | |
757 | * raw_rcv(). Now check if we need to pass a canfd_frame to a legacy | |
758 | * socket and cut the possible CANFD_MTU/CAN_MTU length to CAN_MTU | |
759 | */ | |
760 | if (!ro->fd_frames) | |
761 | rxmtu = CAN_MTU; | |
762 | else | |
763 | rxmtu = skb->len; | |
764 | ||
765 | if (size < rxmtu) | |
c18ce101 OH |
766 | msg->msg_flags |= MSG_TRUNC; |
767 | else | |
e2d265d3 | 768 | size = rxmtu; |
c18ce101 | 769 | |
a219994b UT |
770 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); |
771 | if (err < 0) { | |
c18ce101 | 772 | skb_free_datagram(sk, skb); |
a219994b | 773 | return err; |
c18ce101 OH |
774 | } |
775 | ||
3b885787 | 776 | sock_recv_ts_and_drops(msg, sk, skb); |
c18ce101 OH |
777 | |
778 | if (msg->msg_name) { | |
779 | msg->msg_namelen = sizeof(struct sockaddr_can); | |
780 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
781 | } | |
782 | ||
1e55659c OH |
783 | /* assign the flags that have been recorded in raw_rcv() */ |
784 | msg->msg_flags |= *(raw_flags(skb)); | |
785 | ||
c18ce101 OH |
786 | skb_free_datagram(sk, skb); |
787 | ||
788 | return size; | |
789 | } | |
790 | ||
53914b67 | 791 | static const struct proto_ops raw_ops = { |
c18ce101 OH |
792 | .family = PF_CAN, |
793 | .release = raw_release, | |
794 | .bind = raw_bind, | |
795 | .connect = sock_no_connect, | |
796 | .socketpair = sock_no_socketpair, | |
797 | .accept = sock_no_accept, | |
798 | .getname = raw_getname, | |
799 | .poll = datagram_poll, | |
53914b67 | 800 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
c18ce101 OH |
801 | .listen = sock_no_listen, |
802 | .shutdown = sock_no_shutdown, | |
803 | .setsockopt = raw_setsockopt, | |
804 | .getsockopt = raw_getsockopt, | |
805 | .sendmsg = raw_sendmsg, | |
806 | .recvmsg = raw_recvmsg, | |
807 | .mmap = sock_no_mmap, | |
808 | .sendpage = sock_no_sendpage, | |
809 | }; | |
810 | ||
811 | static struct proto raw_proto __read_mostly = { | |
812 | .name = "CAN_RAW", | |
813 | .owner = THIS_MODULE, | |
814 | .obj_size = sizeof(struct raw_sock), | |
815 | .init = raw_init, | |
816 | }; | |
817 | ||
1650629d | 818 | static const struct can_proto raw_can_proto = { |
c18ce101 OH |
819 | .type = SOCK_RAW, |
820 | .protocol = CAN_RAW, | |
c18ce101 OH |
821 | .ops = &raw_ops, |
822 | .prot = &raw_proto, | |
823 | }; | |
824 | ||
825 | static __init int raw_module_init(void) | |
826 | { | |
827 | int err; | |
828 | ||
829 | printk(banner); | |
830 | ||
831 | err = can_proto_register(&raw_can_proto); | |
832 | if (err < 0) | |
833 | printk(KERN_ERR "can: registration of raw protocol failed\n"); | |
834 | ||
835 | return err; | |
836 | } | |
837 | ||
838 | static __exit void raw_module_exit(void) | |
839 | { | |
840 | can_proto_unregister(&raw_can_proto); | |
841 | } | |
842 | ||
843 | module_init(raw_module_init); | |
844 | module_exit(raw_module_exit); |