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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; | |
101 | int error; | |
102 | ||
103 | if (!ro->recv_own_msgs) { | |
104 | /* check the received tx sock reference */ | |
105 | if (skb->sk == sk) { | |
106 | kfree_skb(skb); | |
107 | return; | |
108 | } | |
109 | } | |
110 | ||
111 | /* | |
112 | * Put the datagram to the queue so that raw_recvmsg() can | |
113 | * get it from there. We need to pass the interface index to | |
114 | * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
115 | * containing the interface index. | |
116 | */ | |
117 | ||
118 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
119 | addr = (struct sockaddr_can *)skb->cb; | |
120 | memset(addr, 0, sizeof(*addr)); | |
121 | addr->can_family = AF_CAN; | |
122 | addr->can_ifindex = skb->dev->ifindex; | |
123 | ||
124 | error = sock_queue_rcv_skb(sk, skb); | |
125 | if (error < 0) | |
126 | kfree_skb(skb); | |
127 | } | |
128 | ||
129 | static int raw_enable_filters(struct net_device *dev, struct sock *sk, | |
130 | struct can_filter *filter, | |
131 | int count) | |
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, | |
166 | struct can_filter *filter, | |
167 | int count) | |
168 | { | |
169 | int i; | |
170 | ||
171 | for (i = 0; i < count; i++) | |
172 | can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask, | |
173 | raw_rcv, sk); | |
174 | } | |
175 | ||
176 | static inline void raw_disable_errfilter(struct net_device *dev, | |
177 | struct sock *sk, | |
178 | can_err_mask_t err_mask) | |
179 | ||
180 | { | |
181 | if (err_mask) | |
182 | can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG, | |
183 | raw_rcv, sk); | |
184 | } | |
185 | ||
186 | static inline void raw_disable_allfilters(struct net_device *dev, | |
187 | struct sock *sk) | |
188 | { | |
189 | struct raw_sock *ro = raw_sk(sk); | |
190 | ||
191 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
192 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
193 | } | |
194 | ||
195 | static int raw_enable_allfilters(struct net_device *dev, struct sock *sk) | |
196 | { | |
197 | struct raw_sock *ro = raw_sk(sk); | |
198 | int err; | |
199 | ||
200 | err = raw_enable_filters(dev, sk, ro->filter, ro->count); | |
201 | if (!err) { | |
202 | err = raw_enable_errfilter(dev, sk, ro->err_mask); | |
203 | if (err) | |
204 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
205 | } | |
206 | ||
207 | return err; | |
208 | } | |
209 | ||
210 | static int raw_notifier(struct notifier_block *nb, | |
211 | unsigned long msg, void *data) | |
212 | { | |
213 | struct net_device *dev = (struct net_device *)data; | |
214 | struct raw_sock *ro = container_of(nb, struct raw_sock, notifier); | |
215 | struct sock *sk = &ro->sk; | |
216 | ||
217 | if (dev->nd_net != &init_net) | |
218 | return NOTIFY_DONE; | |
219 | ||
220 | if (dev->type != ARPHRD_CAN) | |
221 | return NOTIFY_DONE; | |
222 | ||
223 | if (ro->ifindex != dev->ifindex) | |
224 | return NOTIFY_DONE; | |
225 | ||
226 | switch (msg) { | |
227 | ||
228 | case NETDEV_UNREGISTER: | |
229 | lock_sock(sk); | |
230 | /* remove current filters & unregister */ | |
231 | if (ro->bound) | |
232 | raw_disable_allfilters(dev, sk); | |
233 | ||
234 | if (ro->count > 1) | |
235 | kfree(ro->filter); | |
236 | ||
237 | ro->ifindex = 0; | |
238 | ro->bound = 0; | |
239 | ro->count = 0; | |
240 | release_sock(sk); | |
241 | ||
242 | sk->sk_err = ENODEV; | |
243 | if (!sock_flag(sk, SOCK_DEAD)) | |
244 | sk->sk_error_report(sk); | |
245 | break; | |
246 | ||
247 | case NETDEV_DOWN: | |
248 | sk->sk_err = ENETDOWN; | |
249 | if (!sock_flag(sk, SOCK_DEAD)) | |
250 | sk->sk_error_report(sk); | |
251 | break; | |
252 | } | |
253 | ||
254 | return NOTIFY_DONE; | |
255 | } | |
256 | ||
257 | static int raw_init(struct sock *sk) | |
258 | { | |
259 | struct raw_sock *ro = raw_sk(sk); | |
260 | ||
261 | ro->bound = 0; | |
262 | ro->ifindex = 0; | |
263 | ||
264 | /* set default filter to single entry dfilter */ | |
265 | ro->dfilter.can_id = 0; | |
266 | ro->dfilter.can_mask = MASK_ALL; | |
267 | ro->filter = &ro->dfilter; | |
268 | ro->count = 1; | |
269 | ||
270 | /* set default loopback behaviour */ | |
271 | ro->loopback = 1; | |
272 | ro->recv_own_msgs = 0; | |
273 | ||
274 | /* set notifier */ | |
275 | ro->notifier.notifier_call = raw_notifier; | |
276 | ||
277 | register_netdevice_notifier(&ro->notifier); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int raw_release(struct socket *sock) | |
283 | { | |
284 | struct sock *sk = sock->sk; | |
285 | struct raw_sock *ro = raw_sk(sk); | |
286 | ||
287 | unregister_netdevice_notifier(&ro->notifier); | |
288 | ||
289 | lock_sock(sk); | |
290 | ||
291 | /* remove current filters & unregister */ | |
292 | if (ro->bound) { | |
293 | if (ro->ifindex) { | |
294 | struct net_device *dev; | |
295 | ||
296 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
297 | if (dev) { | |
298 | raw_disable_allfilters(dev, sk); | |
299 | dev_put(dev); | |
300 | } | |
301 | } else | |
302 | raw_disable_allfilters(NULL, sk); | |
303 | } | |
304 | ||
305 | if (ro->count > 1) | |
306 | kfree(ro->filter); | |
307 | ||
308 | ro->ifindex = 0; | |
309 | ro->bound = 0; | |
310 | ro->count = 0; | |
311 | ||
312 | release_sock(sk); | |
313 | sock_put(sk); | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len) | |
319 | { | |
320 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
321 | struct sock *sk = sock->sk; | |
322 | struct raw_sock *ro = raw_sk(sk); | |
323 | int ifindex; | |
324 | int err = 0; | |
325 | int notify_enetdown = 0; | |
326 | ||
327 | if (len < sizeof(*addr)) | |
328 | return -EINVAL; | |
329 | ||
330 | lock_sock(sk); | |
331 | ||
332 | if (ro->bound && addr->can_ifindex == ro->ifindex) | |
333 | goto out; | |
334 | ||
335 | if (addr->can_ifindex) { | |
336 | struct net_device *dev; | |
337 | ||
338 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
339 | if (!dev) { | |
340 | err = -ENODEV; | |
341 | goto out; | |
342 | } | |
343 | if (dev->type != ARPHRD_CAN) { | |
344 | dev_put(dev); | |
345 | err = -ENODEV; | |
346 | goto out; | |
347 | } | |
348 | if (!(dev->flags & IFF_UP)) | |
349 | notify_enetdown = 1; | |
350 | ||
351 | ifindex = dev->ifindex; | |
352 | ||
353 | /* filters set by default/setsockopt */ | |
354 | err = raw_enable_allfilters(dev, sk); | |
355 | dev_put(dev); | |
356 | ||
357 | } else { | |
358 | ifindex = 0; | |
359 | ||
360 | /* filters set by default/setsockopt */ | |
361 | err = raw_enable_allfilters(NULL, sk); | |
362 | } | |
363 | ||
364 | if (!err) { | |
365 | if (ro->bound) { | |
366 | /* unregister old filters */ | |
367 | if (ro->ifindex) { | |
368 | struct net_device *dev; | |
369 | ||
370 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
371 | if (dev) { | |
372 | raw_disable_allfilters(dev, sk); | |
373 | dev_put(dev); | |
374 | } | |
375 | } else | |
376 | raw_disable_allfilters(NULL, sk); | |
377 | } | |
378 | ro->ifindex = ifindex; | |
379 | ro->bound = 1; | |
380 | } | |
381 | ||
382 | out: | |
383 | release_sock(sk); | |
384 | ||
385 | if (notify_enetdown) { | |
386 | sk->sk_err = ENETDOWN; | |
387 | if (!sock_flag(sk, SOCK_DEAD)) | |
388 | sk->sk_error_report(sk); | |
389 | } | |
390 | ||
391 | return err; | |
392 | } | |
393 | ||
394 | static int raw_getname(struct socket *sock, struct sockaddr *uaddr, | |
395 | int *len, int peer) | |
396 | { | |
397 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
398 | struct sock *sk = sock->sk; | |
399 | struct raw_sock *ro = raw_sk(sk); | |
400 | ||
401 | if (peer) | |
402 | return -EOPNOTSUPP; | |
403 | ||
404 | addr->can_family = AF_CAN; | |
405 | addr->can_ifindex = ro->ifindex; | |
406 | ||
407 | *len = sizeof(*addr); | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static int raw_setsockopt(struct socket *sock, int level, int optname, | |
413 | char __user *optval, int optlen) | |
414 | { | |
415 | struct sock *sk = sock->sk; | |
416 | struct raw_sock *ro = raw_sk(sk); | |
417 | struct can_filter *filter = NULL; /* dyn. alloc'ed filters */ | |
418 | struct can_filter sfilter; /* single filter */ | |
419 | struct net_device *dev = NULL; | |
420 | can_err_mask_t err_mask = 0; | |
421 | int count = 0; | |
422 | int err = 0; | |
423 | ||
424 | if (level != SOL_CAN_RAW) | |
425 | return -EINVAL; | |
426 | if (optlen < 0) | |
427 | return -EINVAL; | |
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 | ||
443 | err = copy_from_user(filter, optval, optlen); | |
444 | if (err) { | |
445 | kfree(filter); | |
446 | return err; | |
447 | } | |
448 | } else if (count == 1) { | |
449 | err = copy_from_user(&sfilter, optval, optlen); | |
450 | if (err) | |
451 | return err; | |
452 | } | |
453 | ||
454 | lock_sock(sk); | |
455 | ||
456 | if (ro->bound && ro->ifindex) | |
457 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
458 | ||
459 | if (ro->bound) { | |
460 | /* (try to) register the new filters */ | |
461 | if (count == 1) | |
462 | err = raw_enable_filters(dev, sk, &sfilter, 1); | |
463 | else | |
464 | err = raw_enable_filters(dev, sk, filter, | |
465 | count); | |
466 | if (err) { | |
467 | if (count > 1) | |
468 | kfree(filter); | |
469 | ||
470 | goto out_fil; | |
471 | } | |
472 | ||
473 | /* remove old filter registrations */ | |
474 | raw_disable_filters(dev, sk, ro->filter, ro->count); | |
475 | } | |
476 | ||
477 | /* remove old filter space */ | |
478 | if (ro->count > 1) | |
479 | kfree(ro->filter); | |
480 | ||
481 | /* link new filters to the socket */ | |
482 | if (count == 1) { | |
483 | /* copy filter data for single filter */ | |
484 | ro->dfilter = sfilter; | |
485 | filter = &ro->dfilter; | |
486 | } | |
487 | ro->filter = filter; | |
488 | ro->count = count; | |
489 | ||
490 | out_fil: | |
491 | if (dev) | |
492 | dev_put(dev); | |
493 | ||
494 | release_sock(sk); | |
495 | ||
496 | break; | |
497 | ||
498 | case CAN_RAW_ERR_FILTER: | |
499 | if (optlen != sizeof(err_mask)) | |
500 | return -EINVAL; | |
501 | ||
502 | err = copy_from_user(&err_mask, optval, optlen); | |
503 | if (err) | |
504 | return err; | |
505 | ||
506 | err_mask &= CAN_ERR_MASK; | |
507 | ||
508 | lock_sock(sk); | |
509 | ||
510 | if (ro->bound && ro->ifindex) | |
511 | dev = dev_get_by_index(&init_net, ro->ifindex); | |
512 | ||
513 | /* remove current error mask */ | |
514 | if (ro->bound) { | |
515 | /* (try to) register the new err_mask */ | |
516 | err = raw_enable_errfilter(dev, sk, err_mask); | |
517 | ||
518 | if (err) | |
519 | goto out_err; | |
520 | ||
521 | /* remove old err_mask registration */ | |
522 | raw_disable_errfilter(dev, sk, ro->err_mask); | |
523 | } | |
524 | ||
525 | /* link new err_mask to the socket */ | |
526 | ro->err_mask = err_mask; | |
527 | ||
528 | out_err: | |
529 | if (dev) | |
530 | dev_put(dev); | |
531 | ||
532 | release_sock(sk); | |
533 | ||
534 | break; | |
535 | ||
536 | case CAN_RAW_LOOPBACK: | |
537 | if (optlen != sizeof(ro->loopback)) | |
538 | return -EINVAL; | |
539 | ||
540 | err = copy_from_user(&ro->loopback, optval, optlen); | |
541 | ||
542 | break; | |
543 | ||
544 | case CAN_RAW_RECV_OWN_MSGS: | |
545 | if (optlen != sizeof(ro->recv_own_msgs)) | |
546 | return -EINVAL; | |
547 | ||
548 | err = copy_from_user(&ro->recv_own_msgs, optval, optlen); | |
549 | ||
550 | break; | |
551 | ||
552 | default: | |
553 | return -ENOPROTOOPT; | |
554 | } | |
555 | return err; | |
556 | } | |
557 | ||
558 | static int raw_getsockopt(struct socket *sock, int level, int optname, | |
559 | char __user *optval, int __user *optlen) | |
560 | { | |
561 | struct sock *sk = sock->sk; | |
562 | struct raw_sock *ro = raw_sk(sk); | |
563 | int len; | |
564 | void *val; | |
565 | int err = 0; | |
566 | ||
567 | if (level != SOL_CAN_RAW) | |
568 | return -EINVAL; | |
569 | if (get_user(len, optlen)) | |
570 | return -EFAULT; | |
571 | if (len < 0) | |
572 | return -EINVAL; | |
573 | ||
574 | switch (optname) { | |
575 | ||
576 | case CAN_RAW_FILTER: | |
577 | lock_sock(sk); | |
578 | if (ro->count > 0) { | |
579 | int fsize = ro->count * sizeof(struct can_filter); | |
580 | if (len > fsize) | |
581 | len = fsize; | |
582 | err = copy_to_user(optval, ro->filter, len); | |
583 | } else | |
584 | len = 0; | |
585 | release_sock(sk); | |
586 | ||
587 | if (!err) | |
588 | err = put_user(len, optlen); | |
589 | return err; | |
590 | ||
591 | case CAN_RAW_ERR_FILTER: | |
592 | if (len > sizeof(can_err_mask_t)) | |
593 | len = sizeof(can_err_mask_t); | |
594 | val = &ro->err_mask; | |
595 | break; | |
596 | ||
597 | case CAN_RAW_LOOPBACK: | |
598 | if (len > sizeof(int)) | |
599 | len = sizeof(int); | |
600 | val = &ro->loopback; | |
601 | break; | |
602 | ||
603 | case CAN_RAW_RECV_OWN_MSGS: | |
604 | if (len > sizeof(int)) | |
605 | len = sizeof(int); | |
606 | val = &ro->recv_own_msgs; | |
607 | break; | |
608 | ||
609 | default: | |
610 | return -ENOPROTOOPT; | |
611 | } | |
612 | ||
613 | if (put_user(len, optlen)) | |
614 | return -EFAULT; | |
615 | if (copy_to_user(optval, val, len)) | |
616 | return -EFAULT; | |
617 | return 0; | |
618 | } | |
619 | ||
620 | static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, | |
621 | struct msghdr *msg, size_t size) | |
622 | { | |
623 | struct sock *sk = sock->sk; | |
624 | struct raw_sock *ro = raw_sk(sk); | |
625 | struct sk_buff *skb; | |
626 | struct net_device *dev; | |
627 | int ifindex; | |
628 | int err; | |
629 | ||
630 | if (msg->msg_name) { | |
631 | struct sockaddr_can *addr = | |
632 | (struct sockaddr_can *)msg->msg_name; | |
633 | ||
634 | if (addr->can_family != AF_CAN) | |
635 | return -EINVAL; | |
636 | ||
637 | ifindex = addr->can_ifindex; | |
638 | } else | |
639 | ifindex = ro->ifindex; | |
640 | ||
641 | dev = dev_get_by_index(&init_net, ifindex); | |
642 | if (!dev) | |
643 | return -ENXIO; | |
644 | ||
645 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, | |
646 | &err); | |
647 | if (!skb) { | |
648 | dev_put(dev); | |
649 | return err; | |
650 | } | |
651 | ||
652 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
653 | if (err < 0) { | |
654 | kfree_skb(skb); | |
655 | dev_put(dev); | |
656 | return err; | |
657 | } | |
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) | |
666 | return err; | |
667 | ||
668 | return size; | |
669 | } | |
670 | ||
671 | static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, | |
672 | struct msghdr *msg, size_t size, int flags) | |
673 | { | |
674 | struct sock *sk = sock->sk; | |
675 | struct sk_buff *skb; | |
676 | int error = 0; | |
677 | int noblock; | |
678 | ||
679 | noblock = flags & MSG_DONTWAIT; | |
680 | flags &= ~MSG_DONTWAIT; | |
681 | ||
682 | skb = skb_recv_datagram(sk, flags, noblock, &error); | |
683 | if (!skb) | |
684 | return error; | |
685 | ||
686 | if (size < skb->len) | |
687 | msg->msg_flags |= MSG_TRUNC; | |
688 | else | |
689 | size = skb->len; | |
690 | ||
691 | error = memcpy_toiovec(msg->msg_iov, skb->data, size); | |
692 | if (error < 0) { | |
693 | skb_free_datagram(sk, skb); | |
694 | return error; | |
695 | } | |
696 | ||
697 | sock_recv_timestamp(msg, sk, skb); | |
698 | ||
699 | if (msg->msg_name) { | |
700 | msg->msg_namelen = sizeof(struct sockaddr_can); | |
701 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
702 | } | |
703 | ||
704 | skb_free_datagram(sk, skb); | |
705 | ||
706 | return size; | |
707 | } | |
708 | ||
709 | static struct proto_ops raw_ops __read_mostly = { | |
710 | .family = PF_CAN, | |
711 | .release = raw_release, | |
712 | .bind = raw_bind, | |
713 | .connect = sock_no_connect, | |
714 | .socketpair = sock_no_socketpair, | |
715 | .accept = sock_no_accept, | |
716 | .getname = raw_getname, | |
717 | .poll = datagram_poll, | |
718 | .ioctl = NULL, /* use can_ioctl() from af_can.c */ | |
719 | .listen = sock_no_listen, | |
720 | .shutdown = sock_no_shutdown, | |
721 | .setsockopt = raw_setsockopt, | |
722 | .getsockopt = raw_getsockopt, | |
723 | .sendmsg = raw_sendmsg, | |
724 | .recvmsg = raw_recvmsg, | |
725 | .mmap = sock_no_mmap, | |
726 | .sendpage = sock_no_sendpage, | |
727 | }; | |
728 | ||
729 | static struct proto raw_proto __read_mostly = { | |
730 | .name = "CAN_RAW", | |
731 | .owner = THIS_MODULE, | |
732 | .obj_size = sizeof(struct raw_sock), | |
733 | .init = raw_init, | |
734 | }; | |
735 | ||
736 | static struct can_proto raw_can_proto __read_mostly = { | |
737 | .type = SOCK_RAW, | |
738 | .protocol = CAN_RAW, | |
739 | .capability = -1, | |
740 | .ops = &raw_ops, | |
741 | .prot = &raw_proto, | |
742 | }; | |
743 | ||
744 | static __init int raw_module_init(void) | |
745 | { | |
746 | int err; | |
747 | ||
748 | printk(banner); | |
749 | ||
750 | err = can_proto_register(&raw_can_proto); | |
751 | if (err < 0) | |
752 | printk(KERN_ERR "can: registration of raw protocol failed\n"); | |
753 | ||
754 | return err; | |
755 | } | |
756 | ||
757 | static __exit void raw_module_exit(void) | |
758 | { | |
759 | can_proto_unregister(&raw_can_proto); | |
760 | } | |
761 | ||
762 | module_init(raw_module_init); | |
763 | module_exit(raw_module_exit); |