blob: 864c80dbdb72d11cdd24183cec3769222b339ccc [file] [log] [blame]
Oliver Hartkoppc18ce102007-11-16 15:53:09 -08001/*
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 *
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080040 */
41
42#include <linux/module.h>
43#include <linux/init.h>
44#include <linux/uio.h>
45#include <linux/net.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090046#include <linux/slab.h>
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080047#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>
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +010053#include <linux/can/skb.h>
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080054#include <linux/can/raw.h>
55#include <net/sock.h>
56#include <net/net_namespace.h>
57
58#define CAN_RAW_VERSION CAN_VERSION
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080059
60MODULE_DESCRIPTION("PF_CAN raw protocol");
61MODULE_LICENSE("Dual BSD/GPL");
62MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
Lothar Waßmannb13bb2e2009-07-14 23:12:25 +000063MODULE_ALIAS("can-proto-1");
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080064
65#define MASK_ALL 0
66
67/*
68 * A raw socket has a list of can_filters attached to it, each receiving
69 * the CAN frames matching that filter. If the filter list is empty,
70 * no CAN frames will be received by the socket. The default after
71 * opening the socket, is to have one filter which receives all frames.
72 * The filter list is allocated dynamically with the exception of the
73 * list containing only one item. This common case is optimized by
74 * storing the single filter in dfilter, to avoid using dynamic memory.
75 */
76
Oliver Hartkopp514ac992015-04-01 07:50:28 +020077struct uniqframe {
Oliver Hartkoppd3b58c42015-06-26 11:58:19 +020078 int skbcnt;
Oliver Hartkopp514ac992015-04-01 07:50:28 +020079 const struct sk_buff *skb;
Oliver Hartkoppa5581ef2015-04-01 07:50:29 +020080 unsigned int join_rx_count;
Oliver Hartkopp514ac992015-04-01 07:50:28 +020081};
82
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080083struct raw_sock {
84 struct sock sk;
85 int bound;
86 int ifindex;
87 struct notifier_block notifier;
88 int loopback;
89 int recv_own_msgs;
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +020090 int fd_frames;
Oliver Hartkoppa5581ef2015-04-01 07:50:29 +020091 int join_filters;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080092 int count; /* number of active filters */
93 struct can_filter dfilter; /* default/single filter */
94 struct can_filter *filter; /* pointer to filter(s) */
95 can_err_mask_t err_mask;
Oliver Hartkopp514ac992015-04-01 07:50:28 +020096 struct uniqframe __percpu *uniq;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -080097};
98
Oliver Hartkopp1e556592010-10-19 09:32:04 +000099/*
100 * Return pointer to store the extra msg flags for raw_recvmsg().
101 * We use the space of one unsigned int beyond the 'struct sockaddr_can'
102 * in skb->cb.
103 */
104static inline unsigned int *raw_flags(struct sk_buff *skb)
105{
Eyal Birgerb4772ef2015-03-01 14:58:29 +0200106 sock_skb_cb_check_size(sizeof(struct sockaddr_can) +
107 sizeof(unsigned int));
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000108
109 /* return pointer after struct sockaddr_can */
110 return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
111}
112
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800113static inline struct raw_sock *raw_sk(const struct sock *sk)
114{
115 return (struct raw_sock *)sk;
116}
117
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000118static void raw_rcv(struct sk_buff *oskb, void *data)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800119{
120 struct sock *sk = (struct sock *)data;
121 struct raw_sock *ro = raw_sk(sk);
122 struct sockaddr_can *addr;
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000123 struct sk_buff *skb;
124 unsigned int *pflags;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800125
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800126 /* check the received tx sock reference */
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000127 if (!ro->recv_own_msgs && oskb->sk == sk)
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800128 return;
129
Oliver Hartkopp821047c2014-03-01 15:31:53 +0100130 /* do not pass non-CAN2.0 frames to a legacy socket */
131 if (!ro->fd_frames && oskb->len != CAN_MTU)
132 return;
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200133
Oliver Hartkopp514ac992015-04-01 07:50:28 +0200134 /* eliminate multiple filter matches for the same skb */
135 if (this_cpu_ptr(ro->uniq)->skb == oskb &&
Oliver Hartkoppd3b58c42015-06-26 11:58:19 +0200136 this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
Oliver Hartkoppa5581ef2015-04-01 07:50:29 +0200137 if (ro->join_filters) {
138 this_cpu_inc(ro->uniq->join_rx_count);
139 /* drop frame until all enabled filters matched */
140 if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count)
141 return;
142 } else {
143 return;
144 }
Oliver Hartkopp514ac992015-04-01 07:50:28 +0200145 } else {
146 this_cpu_ptr(ro->uniq)->skb = oskb;
Oliver Hartkoppd3b58c42015-06-26 11:58:19 +0200147 this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
Oliver Hartkoppa5581ef2015-04-01 07:50:29 +0200148 this_cpu_ptr(ro->uniq)->join_rx_count = 1;
149 /* drop first frame to check all enabled filters? */
150 if (ro->join_filters && ro->count > 1)
151 return;
Oliver Hartkopp514ac992015-04-01 07:50:28 +0200152 }
153
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800154 /* clone the given skb to be able to enqueue it into the rcv queue */
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000155 skb = skb_clone(oskb, GFP_ATOMIC);
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800156 if (!skb)
157 return;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800158
159 /*
160 * Put the datagram to the queue so that raw_recvmsg() can
161 * get it from there. We need to pass the interface index to
162 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
163 * containing the interface index.
164 */
165
Eyal Birgerb4772ef2015-03-01 14:58:29 +0200166 sock_skb_cb_check_size(sizeof(struct sockaddr_can));
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800167 addr = (struct sockaddr_can *)skb->cb;
168 memset(addr, 0, sizeof(*addr));
169 addr->can_family = AF_CAN;
170 addr->can_ifindex = skb->dev->ifindex;
171
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000172 /* add CAN specific message flags for raw_recvmsg() */
173 pflags = raw_flags(skb);
174 *pflags = 0;
175 if (oskb->sk)
176 *pflags |= MSG_DONTROUTE;
177 if (oskb->sk == sk)
178 *pflags |= MSG_CONFIRM;
179
Urs Thuermanna2199942008-02-07 18:05:04 -0800180 if (sock_queue_rcv_skb(sk, skb) < 0)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800181 kfree_skb(skb);
182}
183
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100184static int raw_enable_filters(struct net *net, struct net_device *dev,
185 struct sock *sk, struct can_filter *filter,
186 int count)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800187{
188 int err = 0;
189 int i;
190
191 for (i = 0; i < count; i++) {
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100192 err = can_rx_register(net, dev, filter[i].can_id,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800193 filter[i].can_mask,
Eric Dumazetf1712c72017-01-27 08:11:44 -0800194 raw_rcv, sk, "raw", sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800195 if (err) {
196 /* clean up successfully registered filters */
197 while (--i >= 0)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100198 can_rx_unregister(net, dev, filter[i].can_id,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800199 filter[i].can_mask,
200 raw_rcv, sk);
201 break;
202 }
203 }
204
205 return err;
206}
207
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100208static int raw_enable_errfilter(struct net *net, struct net_device *dev,
209 struct sock *sk, can_err_mask_t err_mask)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800210{
211 int err = 0;
212
213 if (err_mask)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100214 err = can_rx_register(net, dev, 0, err_mask | CAN_ERR_FLAG,
Eric Dumazetf1712c72017-01-27 08:11:44 -0800215 raw_rcv, sk, "raw", sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800216
217 return err;
218}
219
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100220static void raw_disable_filters(struct net *net, struct net_device *dev,
221 struct sock *sk, struct can_filter *filter,
222 int count)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800223{
224 int i;
225
226 for (i = 0; i < count; i++)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100227 can_rx_unregister(net, dev, filter[i].can_id,
228 filter[i].can_mask, raw_rcv, sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800229}
230
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100231static inline void raw_disable_errfilter(struct net *net,
232 struct net_device *dev,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800233 struct sock *sk,
234 can_err_mask_t err_mask)
235
236{
237 if (err_mask)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100238 can_rx_unregister(net, dev, 0, err_mask | CAN_ERR_FLAG,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800239 raw_rcv, sk);
240}
241
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100242static inline void raw_disable_allfilters(struct net *net,
243 struct net_device *dev,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800244 struct sock *sk)
245{
246 struct raw_sock *ro = raw_sk(sk);
247
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100248 raw_disable_filters(net, dev, sk, ro->filter, ro->count);
249 raw_disable_errfilter(net, dev, sk, ro->err_mask);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800250}
251
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100252static int raw_enable_allfilters(struct net *net, struct net_device *dev,
253 struct sock *sk)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800254{
255 struct raw_sock *ro = raw_sk(sk);
256 int err;
257
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100258 err = raw_enable_filters(net, dev, sk, ro->filter, ro->count);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800259 if (!err) {
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100260 err = raw_enable_errfilter(net, dev, sk, ro->err_mask);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800261 if (err)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100262 raw_disable_filters(net, dev, sk, ro->filter,
263 ro->count);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800264 }
265
266 return err;
267}
268
269static int raw_notifier(struct notifier_block *nb,
Jiri Pirko351638e2013-05-28 01:30:21 +0000270 unsigned long msg, void *ptr)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800271{
Jiri Pirko351638e2013-05-28 01:30:21 +0000272 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800273 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
274 struct sock *sk = &ro->sk;
275
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100276 if (!net_eq(dev_net(dev), sock_net(sk)))
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800277 return NOTIFY_DONE;
278
279 if (dev->type != ARPHRD_CAN)
280 return NOTIFY_DONE;
281
282 if (ro->ifindex != dev->ifindex)
283 return NOTIFY_DONE;
284
285 switch (msg) {
286
287 case NETDEV_UNREGISTER:
288 lock_sock(sk);
289 /* remove current filters & unregister */
290 if (ro->bound)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100291 raw_disable_allfilters(dev_net(dev), dev, sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800292
293 if (ro->count > 1)
294 kfree(ro->filter);
295
296 ro->ifindex = 0;
297 ro->bound = 0;
298 ro->count = 0;
299 release_sock(sk);
300
301 sk->sk_err = ENODEV;
302 if (!sock_flag(sk, SOCK_DEAD))
303 sk->sk_error_report(sk);
304 break;
305
306 case NETDEV_DOWN:
307 sk->sk_err = ENETDOWN;
308 if (!sock_flag(sk, SOCK_DEAD))
309 sk->sk_error_report(sk);
310 break;
311 }
312
313 return NOTIFY_DONE;
314}
315
316static int raw_init(struct sock *sk)
317{
318 struct raw_sock *ro = raw_sk(sk);
319
320 ro->bound = 0;
321 ro->ifindex = 0;
322
323 /* set default filter to single entry dfilter */
324 ro->dfilter.can_id = 0;
325 ro->dfilter.can_mask = MASK_ALL;
326 ro->filter = &ro->dfilter;
327 ro->count = 1;
328
329 /* set default loopback behaviour */
330 ro->loopback = 1;
331 ro->recv_own_msgs = 0;
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200332 ro->fd_frames = 0;
Oliver Hartkoppa5581ef2015-04-01 07:50:29 +0200333 ro->join_filters = 0;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800334
Oliver Hartkopp514ac992015-04-01 07:50:28 +0200335 /* alloc_percpu provides zero'ed memory */
336 ro->uniq = alloc_percpu(struct uniqframe);
337 if (unlikely(!ro->uniq))
338 return -ENOMEM;
339
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800340 /* set notifier */
341 ro->notifier.notifier_call = raw_notifier;
342
343 register_netdevice_notifier(&ro->notifier);
344
345 return 0;
346}
347
348static int raw_release(struct socket *sock)
349{
350 struct sock *sk = sock->sk;
Oliver Hartkopp10022a62011-04-20 01:57:15 +0000351 struct raw_sock *ro;
352
353 if (!sk)
354 return 0;
355
356 ro = raw_sk(sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800357
358 unregister_netdevice_notifier(&ro->notifier);
359
360 lock_sock(sk);
361
362 /* remove current filters & unregister */
363 if (ro->bound) {
364 if (ro->ifindex) {
365 struct net_device *dev;
366
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100367 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800368 if (dev) {
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100369 raw_disable_allfilters(dev_net(dev), dev, sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800370 dev_put(dev);
371 }
372 } else
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100373 raw_disable_allfilters(sock_net(sk), NULL, sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800374 }
375
376 if (ro->count > 1)
377 kfree(ro->filter);
378
379 ro->ifindex = 0;
380 ro->bound = 0;
381 ro->count = 0;
Oliver Hartkopp514ac992015-04-01 07:50:28 +0200382 free_percpu(ro->uniq);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800383
Lothar Waßmannf7e5cc02009-07-14 23:10:21 +0000384 sock_orphan(sk);
385 sock->sk = NULL;
386
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800387 release_sock(sk);
388 sock_put(sk);
389
390 return 0;
391}
392
393static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
394{
395 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
396 struct sock *sk = sock->sk;
397 struct raw_sock *ro = raw_sk(sk);
398 int ifindex;
399 int err = 0;
400 int notify_enetdown = 0;
401
402 if (len < sizeof(*addr))
403 return -EINVAL;
404
405 lock_sock(sk);
406
407 if (ro->bound && addr->can_ifindex == ro->ifindex)
408 goto out;
409
410 if (addr->can_ifindex) {
411 struct net_device *dev;
412
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100413 dev = dev_get_by_index(sock_net(sk), addr->can_ifindex);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800414 if (!dev) {
415 err = -ENODEV;
416 goto out;
417 }
418 if (dev->type != ARPHRD_CAN) {
419 dev_put(dev);
420 err = -ENODEV;
421 goto out;
422 }
423 if (!(dev->flags & IFF_UP))
424 notify_enetdown = 1;
425
426 ifindex = dev->ifindex;
427
428 /* filters set by default/setsockopt */
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100429 err = raw_enable_allfilters(sock_net(sk), dev, sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800430 dev_put(dev);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800431 } else {
432 ifindex = 0;
433
434 /* filters set by default/setsockopt */
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100435 err = raw_enable_allfilters(sock_net(sk), NULL, sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800436 }
437
438 if (!err) {
439 if (ro->bound) {
440 /* unregister old filters */
441 if (ro->ifindex) {
442 struct net_device *dev;
443
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100444 dev = dev_get_by_index(sock_net(sk),
445 ro->ifindex);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800446 if (dev) {
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100447 raw_disable_allfilters(dev_net(dev),
448 dev, sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800449 dev_put(dev);
450 }
451 } else
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100452 raw_disable_allfilters(sock_net(sk), NULL, sk);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800453 }
454 ro->ifindex = ifindex;
455 ro->bound = 1;
456 }
457
458 out:
459 release_sock(sk);
460
461 if (notify_enetdown) {
462 sk->sk_err = ENETDOWN;
463 if (!sock_flag(sk, SOCK_DEAD))
464 sk->sk_error_report(sk);
465 }
466
467 return err;
468}
469
470static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
471 int *len, int peer)
472{
473 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
474 struct sock *sk = sock->sk;
475 struct raw_sock *ro = raw_sk(sk);
476
477 if (peer)
478 return -EOPNOTSUPP;
479
Eric Dumazete84b90a2009-08-06 20:27:04 +0000480 memset(addr, 0, sizeof(*addr));
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800481 addr->can_family = AF_CAN;
482 addr->can_ifindex = ro->ifindex;
483
484 *len = sizeof(*addr);
485
486 return 0;
487}
488
489static int raw_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700490 char __user *optval, unsigned int optlen)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800491{
492 struct sock *sk = sock->sk;
493 struct raw_sock *ro = raw_sk(sk);
494 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
495 struct can_filter sfilter; /* single filter */
496 struct net_device *dev = NULL;
497 can_err_mask_t err_mask = 0;
498 int count = 0;
499 int err = 0;
500
501 if (level != SOL_CAN_RAW)
502 return -EINVAL;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800503
504 switch (optname) {
505
506 case CAN_RAW_FILTER:
507 if (optlen % sizeof(struct can_filter) != 0)
508 return -EINVAL;
509
Marc Kleine-Budde332b05c2016-12-05 11:44:23 +0100510 if (optlen > CAN_RAW_FILTER_MAX * sizeof(struct can_filter))
511 return -EINVAL;
512
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800513 count = optlen / sizeof(struct can_filter);
514
515 if (count > 1) {
516 /* filter does not fit into dfilter => alloc space */
Julia Lawall16dff912010-05-21 22:18:34 +0000517 filter = memdup_user(optval, optlen);
518 if (IS_ERR(filter))
519 return PTR_ERR(filter);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800520 } else if (count == 1) {
Eric Dumazet4ffa8702010-04-09 23:47:31 +0000521 if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700522 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800523 }
524
525 lock_sock(sk);
526
527 if (ro->bound && ro->ifindex)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100528 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800529
530 if (ro->bound) {
531 /* (try to) register the new filters */
532 if (count == 1)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100533 err = raw_enable_filters(sock_net(sk), dev, sk,
534 &sfilter, 1);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800535 else
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100536 err = raw_enable_filters(sock_net(sk), dev, sk,
537 filter, count);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800538 if (err) {
539 if (count > 1)
540 kfree(filter);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800541 goto out_fil;
542 }
543
544 /* remove old filter registrations */
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100545 raw_disable_filters(sock_net(sk), dev, sk, ro->filter,
546 ro->count);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800547 }
548
549 /* remove old filter space */
550 if (ro->count > 1)
551 kfree(ro->filter);
552
553 /* link new filters to the socket */
554 if (count == 1) {
555 /* copy filter data for single filter */
556 ro->dfilter = sfilter;
557 filter = &ro->dfilter;
558 }
559 ro->filter = filter;
560 ro->count = count;
561
562 out_fil:
563 if (dev)
564 dev_put(dev);
565
566 release_sock(sk);
567
568 break;
569
570 case CAN_RAW_ERR_FILTER:
571 if (optlen != sizeof(err_mask))
572 return -EINVAL;
573
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700574 if (copy_from_user(&err_mask, optval, optlen))
575 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800576
577 err_mask &= CAN_ERR_MASK;
578
579 lock_sock(sk);
580
581 if (ro->bound && ro->ifindex)
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100582 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800583
584 /* remove current error mask */
585 if (ro->bound) {
586 /* (try to) register the new err_mask */
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100587 err = raw_enable_errfilter(sock_net(sk), dev, sk,
588 err_mask);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800589
590 if (err)
591 goto out_err;
592
593 /* remove old err_mask registration */
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100594 raw_disable_errfilter(sock_net(sk), dev, sk,
595 ro->err_mask);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800596 }
597
598 /* link new err_mask to the socket */
599 ro->err_mask = err_mask;
600
601 out_err:
602 if (dev)
603 dev_put(dev);
604
605 release_sock(sk);
606
607 break;
608
609 case CAN_RAW_LOOPBACK:
610 if (optlen != sizeof(ro->loopback))
611 return -EINVAL;
612
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700613 if (copy_from_user(&ro->loopback, optval, optlen))
614 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800615
616 break;
617
618 case CAN_RAW_RECV_OWN_MSGS:
619 if (optlen != sizeof(ro->recv_own_msgs))
620 return -EINVAL;
621
Sam Ravnborg3f91bd42008-04-26 22:57:25 -0700622 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
623 return -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800624
625 break;
626
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200627 case CAN_RAW_FD_FRAMES:
628 if (optlen != sizeof(ro->fd_frames))
629 return -EINVAL;
630
631 if (copy_from_user(&ro->fd_frames, optval, optlen))
632 return -EFAULT;
633
634 break;
635
Oliver Hartkoppa5581ef2015-04-01 07:50:29 +0200636 case CAN_RAW_JOIN_FILTERS:
637 if (optlen != sizeof(ro->join_filters))
638 return -EINVAL;
639
640 if (copy_from_user(&ro->join_filters, optval, optlen))
641 return -EFAULT;
642
643 break;
644
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800645 default:
646 return -ENOPROTOOPT;
647 }
648 return err;
649}
650
651static int raw_getsockopt(struct socket *sock, int level, int optname,
652 char __user *optval, int __user *optlen)
653{
654 struct sock *sk = sock->sk;
655 struct raw_sock *ro = raw_sk(sk);
656 int len;
657 void *val;
658 int err = 0;
659
660 if (level != SOL_CAN_RAW)
661 return -EINVAL;
662 if (get_user(len, optlen))
663 return -EFAULT;
664 if (len < 0)
665 return -EINVAL;
666
667 switch (optname) {
668
669 case CAN_RAW_FILTER:
670 lock_sock(sk);
671 if (ro->count > 0) {
672 int fsize = ro->count * sizeof(struct can_filter);
673 if (len > fsize)
674 len = fsize;
Pavel Emelyanov653252c2008-04-25 01:49:48 -0700675 if (copy_to_user(optval, ro->filter, len))
676 err = -EFAULT;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800677 } else
678 len = 0;
679 release_sock(sk);
680
681 if (!err)
682 err = put_user(len, optlen);
683 return err;
684
685 case CAN_RAW_ERR_FILTER:
686 if (len > sizeof(can_err_mask_t))
687 len = sizeof(can_err_mask_t);
688 val = &ro->err_mask;
689 break;
690
691 case CAN_RAW_LOOPBACK:
692 if (len > sizeof(int))
693 len = sizeof(int);
694 val = &ro->loopback;
695 break;
696
697 case CAN_RAW_RECV_OWN_MSGS:
698 if (len > sizeof(int))
699 len = sizeof(int);
700 val = &ro->recv_own_msgs;
701 break;
702
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200703 case CAN_RAW_FD_FRAMES:
704 if (len > sizeof(int))
705 len = sizeof(int);
706 val = &ro->fd_frames;
707 break;
708
Oliver Hartkoppa5581ef2015-04-01 07:50:29 +0200709 case CAN_RAW_JOIN_FILTERS:
710 if (len > sizeof(int))
711 len = sizeof(int);
712 val = &ro->join_filters;
713 break;
714
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800715 default:
716 return -ENOPROTOOPT;
717 }
718
719 if (put_user(len, optlen))
720 return -EFAULT;
721 if (copy_to_user(optval, val, len))
722 return -EFAULT;
723 return 0;
724}
725
Ying Xue1b784142015-03-02 15:37:48 +0800726static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800727{
728 struct sock *sk = sock->sk;
729 struct raw_sock *ro = raw_sk(sk);
730 struct sk_buff *skb;
731 struct net_device *dev;
732 int ifindex;
733 int err;
734
735 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100736 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800737
Kurt Van Dijck5e5073282011-01-15 20:56:42 -0800738 if (msg->msg_namelen < sizeof(*addr))
739 return -EINVAL;
740
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800741 if (addr->can_family != AF_CAN)
742 return -EINVAL;
743
744 ifindex = addr->can_ifindex;
745 } else
746 ifindex = ro->ifindex;
747
Oliver Hartkoppe2d265d2012-06-13 20:41:31 +0200748 if (ro->fd_frames) {
749 if (unlikely(size != CANFD_MTU && size != CAN_MTU))
750 return -EINVAL;
751 } else {
752 if (unlikely(size != CAN_MTU))
753 return -EINVAL;
754 }
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700755
Mario Kicherer8e8cda62017-02-21 12:19:47 +0100756 dev = dev_get_by_index(sock_net(sk), ifindex);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800757 if (!dev)
758 return -ENXIO;
759
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +0100760 skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
761 msg->msg_flags & MSG_DONTWAIT, &err);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800762 if (!skb)
763 goto put_dev;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800764
Oliver Hartkopp2bf34402013-01-28 08:33:33 +0000765 can_skb_reserve(skb);
766 can_skb_prv(skb)->ifindex = dev->ifindex;
Oliver Hartkoppd3b58c42015-06-26 11:58:19 +0200767 can_skb_prv(skb)->skbcnt = 0;
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +0100768
Al Viro6ce8e9c2014-04-06 21:25:44 -0400769 err = memcpy_from_msg(skb_put(skb, size), msg, size);
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800770 if (err < 0)
771 goto free_skb;
Daniel Borkmannbf84a012013-04-14 08:08:13 +0000772
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400773 sock_tx_timestamp(sk, sk->sk_tsflags, &skb_shinfo(skb)->tx_flags);
Oliver Hartkoppcff0d6e2010-08-03 00:31:48 -0700774
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800775 skb->dev = dev;
776 skb->sk = sk;
Rostislav Lisovybb5ecb02014-01-24 13:17:37 +0100777 skb->priority = sk->sk_priority;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800778
779 err = can_send(skb, ro->loopback);
780
781 dev_put(dev);
782
783 if (err)
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800784 goto send_failed;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800785
786 return size;
Ilpo Järvinenebad5c02008-12-14 23:16:58 -0800787
788free_skb:
789 kfree_skb(skb);
790put_dev:
791 dev_put(dev);
792send_failed:
793 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800794}
795
Ying Xue1b784142015-03-02 15:37:48 +0800796static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
797 int flags)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800798{
799 struct sock *sk = sock->sk;
800 struct sk_buff *skb;
Urs Thuermanna2199942008-02-07 18:05:04 -0800801 int err = 0;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800802 int noblock;
803
804 noblock = flags & MSG_DONTWAIT;
805 flags &= ~MSG_DONTWAIT;
806
Urs Thuermanna2199942008-02-07 18:05:04 -0800807 skb = skb_recv_datagram(sk, flags, noblock, &err);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800808 if (!skb)
Urs Thuermanna2199942008-02-07 18:05:04 -0800809 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800810
Oliver Hartkopp821047c2014-03-01 15:31:53 +0100811 if (size < skb->len)
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800812 msg->msg_flags |= MSG_TRUNC;
813 else
Oliver Hartkopp821047c2014-03-01 15:31:53 +0100814 size = skb->len;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800815
Al Viro7eab8d92014-04-06 21:51:23 -0400816 err = memcpy_to_msg(msg, skb->data, size);
Urs Thuermanna2199942008-02-07 18:05:04 -0800817 if (err < 0) {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800818 skb_free_datagram(sk, skb);
Urs Thuermanna2199942008-02-07 18:05:04 -0800819 return err;
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800820 }
821
Neil Horman3b885782009-10-12 13:26:31 -0700822 sock_recv_ts_and_drops(msg, sk, skb);
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800823
824 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100825 __sockaddr_check_size(sizeof(struct sockaddr_can));
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800826 msg->msg_namelen = sizeof(struct sockaddr_can);
827 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
828 }
829
Oliver Hartkopp1e556592010-10-19 09:32:04 +0000830 /* assign the flags that have been recorded in raw_rcv() */
831 msg->msg_flags |= *(raw_flags(skb));
832
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800833 skb_free_datagram(sk, skb);
834
835 return size;
836}
837
Oliver Hartkopp53914b62011-03-22 08:27:25 +0000838static const struct proto_ops raw_ops = {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800839 .family = PF_CAN,
840 .release = raw_release,
841 .bind = raw_bind,
842 .connect = sock_no_connect,
843 .socketpair = sock_no_socketpair,
844 .accept = sock_no_accept,
845 .getname = raw_getname,
846 .poll = datagram_poll,
Oliver Hartkopp53914b62011-03-22 08:27:25 +0000847 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800848 .listen = sock_no_listen,
849 .shutdown = sock_no_shutdown,
850 .setsockopt = raw_setsockopt,
851 .getsockopt = raw_getsockopt,
852 .sendmsg = raw_sendmsg,
853 .recvmsg = raw_recvmsg,
854 .mmap = sock_no_mmap,
855 .sendpage = sock_no_sendpage,
856};
857
858static struct proto raw_proto __read_mostly = {
859 .name = "CAN_RAW",
860 .owner = THIS_MODULE,
861 .obj_size = sizeof(struct raw_sock),
862 .init = raw_init,
863};
864
Kurt Van Dijck16506292011-05-03 18:40:57 +0000865static const struct can_proto raw_can_proto = {
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800866 .type = SOCK_RAW,
867 .protocol = CAN_RAW,
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800868 .ops = &raw_ops,
869 .prot = &raw_proto,
870};
871
872static __init int raw_module_init(void)
873{
874 int err;
875
Jeremiah Mahlerb111b782014-11-21 23:42:35 -0800876 pr_info("can: raw protocol (rev " CAN_RAW_VERSION ")\n");
Oliver Hartkoppc18ce102007-11-16 15:53:09 -0800877
878 err = can_proto_register(&raw_can_proto);
879 if (err < 0)
880 printk(KERN_ERR "can: registration of raw protocol failed\n");
881
882 return err;
883}
884
885static __exit void raw_module_exit(void)
886{
887 can_proto_unregister(&raw_can_proto);
888}
889
890module_init(raw_module_init);
891module_exit(raw_module_exit);