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Commit | Line | Data |
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ffd980f9 OH |
1 | /* |
2 | * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content | |
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 | * | |
ffd980f9 OH |
40 | */ |
41 | ||
42 | #include <linux/module.h> | |
43 | #include <linux/init.h> | |
a6b7a407 | 44 | #include <linux/interrupt.h> |
73e87e02 | 45 | #include <linux/hrtimer.h> |
ffd980f9 OH |
46 | #include <linux/list.h> |
47 | #include <linux/proc_fs.h> | |
ea00b8e2 | 48 | #include <linux/seq_file.h> |
ffd980f9 OH |
49 | #include <linux/uio.h> |
50 | #include <linux/net.h> | |
51 | #include <linux/netdevice.h> | |
52 | #include <linux/socket.h> | |
53 | #include <linux/if_arp.h> | |
54 | #include <linux/skbuff.h> | |
55 | #include <linux/can.h> | |
56 | #include <linux/can/core.h> | |
57 | #include <linux/can/bcm.h> | |
5a0e3ad6 | 58 | #include <linux/slab.h> |
ffd980f9 OH |
59 | #include <net/sock.h> |
60 | #include <net/net_namespace.h> | |
61 | ||
5b75c497 OH |
62 | /* |
63 | * To send multiple CAN frame content within TX_SETUP or to filter | |
64 | * CAN messages with multiplex index within RX_SETUP, the number of | |
65 | * different filters is limited to 256 due to the one byte index value. | |
66 | */ | |
67 | #define MAX_NFRAMES 256 | |
68 | ||
ffd980f9 OH |
69 | /* use of last_frames[index].can_dlc */ |
70 | #define RX_RECV 0x40 /* received data for this element */ | |
71 | #define RX_THR 0x80 /* element not been sent due to throttle feature */ | |
72 | #define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */ | |
73 | ||
74 | /* get best masking value for can_rx_register() for a given single can_id */ | |
d253eee2 OH |
75 | #define REGMASK(id) ((id & CAN_EFF_FLAG) ? \ |
76 | (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ | |
77 | (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) | |
ffd980f9 | 78 | |
d253eee2 | 79 | #define CAN_BCM_VERSION CAN_VERSION |
ffd980f9 | 80 | static __initdata const char banner[] = KERN_INFO |
6e5c172c | 81 | "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"; |
ffd980f9 OH |
82 | |
83 | MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); | |
84 | MODULE_LICENSE("Dual BSD/GPL"); | |
85 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); | |
b13bb2e9 | 86 | MODULE_ALIAS("can-proto-2"); |
ffd980f9 OH |
87 | |
88 | /* easy access to can_frame payload */ | |
89 | static inline u64 GET_U64(const struct can_frame *cp) | |
90 | { | |
91 | return *(u64 *)cp->data; | |
92 | } | |
93 | ||
94 | struct bcm_op { | |
95 | struct list_head list; | |
96 | int ifindex; | |
97 | canid_t can_id; | |
5b75c497 | 98 | u32 flags; |
ffd980f9 | 99 | unsigned long frames_abs, frames_filtered; |
ffd980f9 | 100 | struct timeval ival1, ival2; |
73e87e02 | 101 | struct hrtimer timer, thrtimer; |
6e5c172c | 102 | struct tasklet_struct tsklet, thrtsklet; |
73e87e02 | 103 | ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; |
ffd980f9 | 104 | int rx_ifindex; |
5b75c497 OH |
105 | u32 count; |
106 | u32 nframes; | |
107 | u32 currframe; | |
ffd980f9 OH |
108 | struct can_frame *frames; |
109 | struct can_frame *last_frames; | |
110 | struct can_frame sframe; | |
111 | struct can_frame last_sframe; | |
112 | struct sock *sk; | |
113 | struct net_device *rx_reg_dev; | |
114 | }; | |
115 | ||
116 | static struct proc_dir_entry *proc_dir; | |
117 | ||
118 | struct bcm_sock { | |
119 | struct sock sk; | |
120 | int bound; | |
121 | int ifindex; | |
122 | struct notifier_block notifier; | |
123 | struct list_head rx_ops; | |
124 | struct list_head tx_ops; | |
125 | unsigned long dropped_usr_msgs; | |
126 | struct proc_dir_entry *bcm_proc_read; | |
9f260e0e | 127 | char procname [32]; /* inode number in decimal with \0 */ |
ffd980f9 OH |
128 | }; |
129 | ||
130 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) | |
131 | { | |
132 | return (struct bcm_sock *)sk; | |
133 | } | |
134 | ||
135 | #define CFSIZ sizeof(struct can_frame) | |
136 | #define OPSIZ sizeof(struct bcm_op) | |
137 | #define MHSIZ sizeof(struct bcm_msg_head) | |
138 | ||
ffd980f9 OH |
139 | /* |
140 | * procfs functions | |
141 | */ | |
6755aeba | 142 | static char *bcm_proc_getifname(char *result, int ifindex) |
ffd980f9 OH |
143 | { |
144 | struct net_device *dev; | |
145 | ||
146 | if (!ifindex) | |
147 | return "any"; | |
148 | ||
ff879eb6 | 149 | rcu_read_lock(); |
150 | dev = dev_get_by_index_rcu(&init_net, ifindex); | |
ffd980f9 | 151 | if (dev) |
6755aeba ED |
152 | strcpy(result, dev->name); |
153 | else | |
154 | strcpy(result, "???"); | |
ff879eb6 | 155 | rcu_read_unlock(); |
ffd980f9 | 156 | |
6755aeba | 157 | return result; |
ffd980f9 OH |
158 | } |
159 | ||
ea00b8e2 | 160 | static int bcm_proc_show(struct seq_file *m, void *v) |
ffd980f9 | 161 | { |
6755aeba | 162 | char ifname[IFNAMSIZ]; |
ea00b8e2 | 163 | struct sock *sk = (struct sock *)m->private; |
ffd980f9 OH |
164 | struct bcm_sock *bo = bcm_sk(sk); |
165 | struct bcm_op *op; | |
166 | ||
71338aa7 DR |
167 | seq_printf(m, ">>> socket %pK", sk->sk_socket); |
168 | seq_printf(m, " / sk %pK", sk); | |
169 | seq_printf(m, " / bo %pK", bo); | |
ea00b8e2 | 170 | seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); |
6755aeba | 171 | seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); |
ea00b8e2 | 172 | seq_printf(m, " <<<\n"); |
ffd980f9 OH |
173 | |
174 | list_for_each_entry(op, &bo->rx_ops, list) { | |
175 | ||
176 | unsigned long reduction; | |
177 | ||
178 | /* print only active entries & prevent division by zero */ | |
179 | if (!op->frames_abs) | |
180 | continue; | |
181 | ||
ea00b8e2 | 182 | seq_printf(m, "rx_op: %03X %-5s ", |
6755aeba | 183 | op->can_id, bcm_proc_getifname(ifname, op->ifindex)); |
5b75c497 | 184 | seq_printf(m, "[%u]%c ", op->nframes, |
ffd980f9 | 185 | (op->flags & RX_CHECK_DLC)?'d':' '); |
73e87e02 | 186 | if (op->kt_ival1.tv64) |
ea00b8e2 | 187 | seq_printf(m, "timeo=%lld ", |
73e87e02 OH |
188 | (long long) |
189 | ktime_to_us(op->kt_ival1)); | |
ffd980f9 | 190 | |
73e87e02 | 191 | if (op->kt_ival2.tv64) |
ea00b8e2 | 192 | seq_printf(m, "thr=%lld ", |
73e87e02 OH |
193 | (long long) |
194 | ktime_to_us(op->kt_ival2)); | |
ffd980f9 | 195 | |
ea00b8e2 | 196 | seq_printf(m, "# recv %ld (%ld) => reduction: ", |
ffd980f9 OH |
197 | op->frames_filtered, op->frames_abs); |
198 | ||
199 | reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; | |
200 | ||
ea00b8e2 | 201 | seq_printf(m, "%s%ld%%\n", |
ffd980f9 | 202 | (reduction == 100)?"near ":"", reduction); |
ffd980f9 OH |
203 | } |
204 | ||
205 | list_for_each_entry(op, &bo->tx_ops, list) { | |
206 | ||
5b75c497 | 207 | seq_printf(m, "tx_op: %03X %s [%u] ", |
6755aeba ED |
208 | op->can_id, |
209 | bcm_proc_getifname(ifname, op->ifindex), | |
ffd980f9 | 210 | op->nframes); |
ffd980f9 | 211 | |
73e87e02 | 212 | if (op->kt_ival1.tv64) |
ea00b8e2 | 213 | seq_printf(m, "t1=%lld ", |
73e87e02 OH |
214 | (long long) ktime_to_us(op->kt_ival1)); |
215 | ||
216 | if (op->kt_ival2.tv64) | |
ea00b8e2 | 217 | seq_printf(m, "t2=%lld ", |
73e87e02 | 218 | (long long) ktime_to_us(op->kt_ival2)); |
ffd980f9 | 219 | |
ea00b8e2 | 220 | seq_printf(m, "# sent %ld\n", op->frames_abs); |
ffd980f9 | 221 | } |
ea00b8e2 AD |
222 | seq_putc(m, '\n'); |
223 | return 0; | |
224 | } | |
ffd980f9 | 225 | |
ea00b8e2 AD |
226 | static int bcm_proc_open(struct inode *inode, struct file *file) |
227 | { | |
228 | return single_open(file, bcm_proc_show, PDE(inode)->data); | |
ffd980f9 OH |
229 | } |
230 | ||
ea00b8e2 AD |
231 | static const struct file_operations bcm_proc_fops = { |
232 | .owner = THIS_MODULE, | |
233 | .open = bcm_proc_open, | |
234 | .read = seq_read, | |
235 | .llseek = seq_lseek, | |
236 | .release = single_release, | |
237 | }; | |
238 | ||
ffd980f9 OH |
239 | /* |
240 | * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface | |
241 | * of the given bcm tx op | |
242 | */ | |
243 | static void bcm_can_tx(struct bcm_op *op) | |
244 | { | |
245 | struct sk_buff *skb; | |
246 | struct net_device *dev; | |
247 | struct can_frame *cf = &op->frames[op->currframe]; | |
248 | ||
249 | /* no target device? => exit */ | |
250 | if (!op->ifindex) | |
251 | return; | |
252 | ||
253 | dev = dev_get_by_index(&init_net, op->ifindex); | |
254 | if (!dev) { | |
255 | /* RFC: should this bcm_op remove itself here? */ | |
256 | return; | |
257 | } | |
258 | ||
259 | skb = alloc_skb(CFSIZ, gfp_any()); | |
260 | if (!skb) | |
261 | goto out; | |
262 | ||
263 | memcpy(skb_put(skb, CFSIZ), cf, CFSIZ); | |
264 | ||
265 | /* send with loopback */ | |
266 | skb->dev = dev; | |
267 | skb->sk = op->sk; | |
268 | can_send(skb, 1); | |
269 | ||
270 | /* update statistics */ | |
271 | op->currframe++; | |
272 | op->frames_abs++; | |
273 | ||
274 | /* reached last frame? */ | |
275 | if (op->currframe >= op->nframes) | |
276 | op->currframe = 0; | |
277 | out: | |
278 | dev_put(dev); | |
279 | } | |
280 | ||
281 | /* | |
282 | * bcm_send_to_user - send a BCM message to the userspace | |
283 | * (consisting of bcm_msg_head + x CAN frames) | |
284 | */ | |
285 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, | |
286 | struct can_frame *frames, int has_timestamp) | |
287 | { | |
288 | struct sk_buff *skb; | |
289 | struct can_frame *firstframe; | |
290 | struct sockaddr_can *addr; | |
291 | struct sock *sk = op->sk; | |
5b75c497 | 292 | unsigned int datalen = head->nframes * CFSIZ; |
ffd980f9 OH |
293 | int err; |
294 | ||
295 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); | |
296 | if (!skb) | |
297 | return; | |
298 | ||
299 | memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); | |
300 | ||
301 | if (head->nframes) { | |
302 | /* can_frames starting here */ | |
7f2d38eb | 303 | firstframe = (struct can_frame *)skb_tail_pointer(skb); |
ffd980f9 OH |
304 | |
305 | memcpy(skb_put(skb, datalen), frames, datalen); | |
306 | ||
307 | /* | |
308 | * the BCM uses the can_dlc-element of the can_frame | |
309 | * structure for internal purposes. This is only | |
310 | * relevant for updates that are generated by the | |
311 | * BCM, where nframes is 1 | |
312 | */ | |
313 | if (head->nframes == 1) | |
314 | firstframe->can_dlc &= BCM_CAN_DLC_MASK; | |
315 | } | |
316 | ||
317 | if (has_timestamp) { | |
318 | /* restore rx timestamp */ | |
319 | skb->tstamp = op->rx_stamp; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Put the datagram to the queue so that bcm_recvmsg() can | |
324 | * get it from there. We need to pass the interface index to | |
325 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
326 | * containing the interface index. | |
327 | */ | |
328 | ||
329 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
330 | addr = (struct sockaddr_can *)skb->cb; | |
331 | memset(addr, 0, sizeof(*addr)); | |
332 | addr->can_family = AF_CAN; | |
333 | addr->can_ifindex = op->rx_ifindex; | |
334 | ||
335 | err = sock_queue_rcv_skb(sk, skb); | |
336 | if (err < 0) { | |
337 | struct bcm_sock *bo = bcm_sk(sk); | |
338 | ||
339 | kfree_skb(skb); | |
340 | /* don't care about overflows in this statistic */ | |
341 | bo->dropped_usr_msgs++; | |
342 | } | |
343 | } | |
344 | ||
12d0d0d3 OH |
345 | static void bcm_tx_start_timer(struct bcm_op *op) |
346 | { | |
347 | if (op->kt_ival1.tv64 && op->count) | |
348 | hrtimer_start(&op->timer, | |
349 | ktime_add(ktime_get(), op->kt_ival1), | |
350 | HRTIMER_MODE_ABS); | |
351 | else if (op->kt_ival2.tv64) | |
352 | hrtimer_start(&op->timer, | |
353 | ktime_add(ktime_get(), op->kt_ival2), | |
354 | HRTIMER_MODE_ABS); | |
355 | } | |
356 | ||
6e5c172c OH |
357 | static void bcm_tx_timeout_tsklet(unsigned long data) |
358 | { | |
359 | struct bcm_op *op = (struct bcm_op *)data; | |
360 | struct bcm_msg_head msg_head; | |
361 | ||
73e87e02 | 362 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
ffd980f9 OH |
363 | |
364 | op->count--; | |
c53a6ee8 OH |
365 | if (!op->count && (op->flags & TX_COUNTEVT)) { |
366 | ||
367 | /* create notification to user */ | |
368 | msg_head.opcode = TX_EXPIRED; | |
369 | msg_head.flags = op->flags; | |
370 | msg_head.count = op->count; | |
371 | msg_head.ival1 = op->ival1; | |
372 | msg_head.ival2 = op->ival2; | |
373 | msg_head.can_id = op->can_id; | |
374 | msg_head.nframes = 0; | |
375 | ||
376 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
377 | } | |
ffd980f9 | 378 | bcm_can_tx(op); |
ffd980f9 | 379 | |
12d0d0d3 OH |
380 | } else if (op->kt_ival2.tv64) |
381 | bcm_can_tx(op); | |
ffd980f9 | 382 | |
12d0d0d3 | 383 | bcm_tx_start_timer(op); |
c53a6ee8 OH |
384 | } |
385 | ||
386 | /* | |
25985edc | 387 | * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions |
c53a6ee8 OH |
388 | */ |
389 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) | |
390 | { | |
391 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
392 | ||
393 | tasklet_schedule(&op->tsklet); | |
ffd980f9 | 394 | |
c53a6ee8 | 395 | return HRTIMER_NORESTART; |
ffd980f9 OH |
396 | } |
397 | ||
398 | /* | |
399 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content | |
400 | */ | |
401 | static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) | |
402 | { | |
403 | struct bcm_msg_head head; | |
404 | ||
ffd980f9 OH |
405 | /* update statistics */ |
406 | op->frames_filtered++; | |
407 | ||
408 | /* prevent statistics overflow */ | |
409 | if (op->frames_filtered > ULONG_MAX/100) | |
410 | op->frames_filtered = op->frames_abs = 0; | |
411 | ||
6e5c172c OH |
412 | /* this element is not throttled anymore */ |
413 | data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV); | |
414 | ||
ffd980f9 OH |
415 | head.opcode = RX_CHANGED; |
416 | head.flags = op->flags; | |
417 | head.count = op->count; | |
418 | head.ival1 = op->ival1; | |
419 | head.ival2 = op->ival2; | |
420 | head.can_id = op->can_id; | |
421 | head.nframes = 1; | |
422 | ||
423 | bcm_send_to_user(op, &head, data, 1); | |
424 | } | |
425 | ||
426 | /* | |
427 | * bcm_rx_update_and_send - process a detected relevant receive content change | |
428 | * 1. update the last received data | |
429 | * 2. send a notification to the user (if possible) | |
430 | */ | |
431 | static void bcm_rx_update_and_send(struct bcm_op *op, | |
432 | struct can_frame *lastdata, | |
6e5c172c | 433 | const struct can_frame *rxdata) |
ffd980f9 | 434 | { |
ffd980f9 OH |
435 | memcpy(lastdata, rxdata, CFSIZ); |
436 | ||
6e5c172c OH |
437 | /* mark as used and throttled by default */ |
438 | lastdata->can_dlc |= (RX_RECV|RX_THR); | |
ffd980f9 | 439 | |
6e5c172c OH |
440 | /* throtteling mode inactive ? */ |
441 | if (!op->kt_ival2.tv64) { | |
73e87e02 | 442 | /* send RX_CHANGED to the user immediately */ |
6e5c172c | 443 | bcm_rx_changed(op, lastdata); |
73e87e02 OH |
444 | return; |
445 | } | |
ffd980f9 | 446 | |
6e5c172c OH |
447 | /* with active throttling timer we are just done here */ |
448 | if (hrtimer_active(&op->thrtimer)) | |
73e87e02 | 449 | return; |
ffd980f9 | 450 | |
6e5c172c OH |
451 | /* first receiption with enabled throttling mode */ |
452 | if (!op->kt_lastmsg.tv64) | |
453 | goto rx_changed_settime; | |
73e87e02 | 454 | |
6e5c172c | 455 | /* got a second frame inside a potential throttle period? */ |
73e87e02 OH |
456 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
457 | ktime_to_us(op->kt_ival2)) { | |
6e5c172c | 458 | /* do not send the saved data - only start throttle timer */ |
73e87e02 OH |
459 | hrtimer_start(&op->thrtimer, |
460 | ktime_add(op->kt_lastmsg, op->kt_ival2), | |
461 | HRTIMER_MODE_ABS); | |
462 | return; | |
463 | } | |
464 | ||
465 | /* the gap was that big, that throttling was not needed here */ | |
6e5c172c OH |
466 | rx_changed_settime: |
467 | bcm_rx_changed(op, lastdata); | |
73e87e02 | 468 | op->kt_lastmsg = ktime_get(); |
ffd980f9 OH |
469 | } |
470 | ||
471 | /* | |
472 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly | |
473 | * received data stored in op->last_frames[] | |
474 | */ | |
5b75c497 | 475 | static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
6e5c172c | 476 | const struct can_frame *rxdata) |
ffd980f9 OH |
477 | { |
478 | /* | |
479 | * no one uses the MSBs of can_dlc for comparation, | |
480 | * so we use it here to detect the first time of reception | |
481 | */ | |
482 | ||
483 | if (!(op->last_frames[index].can_dlc & RX_RECV)) { | |
484 | /* received data for the first time => send update to user */ | |
485 | bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); | |
486 | return; | |
487 | } | |
488 | ||
489 | /* do a real check in can_frame data section */ | |
490 | ||
491 | if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) != | |
492 | (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) { | |
493 | bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); | |
494 | return; | |
495 | } | |
496 | ||
497 | if (op->flags & RX_CHECK_DLC) { | |
498 | /* do a real check in can_frame dlc */ | |
499 | if (rxdata->can_dlc != (op->last_frames[index].can_dlc & | |
500 | BCM_CAN_DLC_MASK)) { | |
501 | bcm_rx_update_and_send(op, &op->last_frames[index], | |
502 | rxdata); | |
503 | return; | |
504 | } | |
505 | } | |
506 | } | |
507 | ||
508 | /* | |
509 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption | |
510 | */ | |
511 | static void bcm_rx_starttimer(struct bcm_op *op) | |
512 | { | |
513 | if (op->flags & RX_NO_AUTOTIMER) | |
514 | return; | |
515 | ||
73e87e02 OH |
516 | if (op->kt_ival1.tv64) |
517 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); | |
ffd980f9 OH |
518 | } |
519 | ||
6e5c172c | 520 | static void bcm_rx_timeout_tsklet(unsigned long data) |
ffd980f9 | 521 | { |
6e5c172c | 522 | struct bcm_op *op = (struct bcm_op *)data; |
ffd980f9 OH |
523 | struct bcm_msg_head msg_head; |
524 | ||
6e5c172c | 525 | /* create notification to user */ |
ffd980f9 OH |
526 | msg_head.opcode = RX_TIMEOUT; |
527 | msg_head.flags = op->flags; | |
528 | msg_head.count = op->count; | |
529 | msg_head.ival1 = op->ival1; | |
530 | msg_head.ival2 = op->ival2; | |
531 | msg_head.can_id = op->can_id; | |
532 | msg_head.nframes = 0; | |
533 | ||
534 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
6e5c172c OH |
535 | } |
536 | ||
537 | /* | |
538 | * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out | |
539 | */ | |
540 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) | |
541 | { | |
542 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
543 | ||
544 | /* schedule before NET_RX_SOFTIRQ */ | |
545 | tasklet_hi_schedule(&op->tsklet); | |
ffd980f9 OH |
546 | |
547 | /* no restart of the timer is done here! */ | |
548 | ||
549 | /* if user wants to be informed, when cyclic CAN-Messages come back */ | |
550 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { | |
551 | /* clear received can_frames to indicate 'nothing received' */ | |
552 | memset(op->last_frames, 0, op->nframes * CFSIZ); | |
553 | } | |
73e87e02 OH |
554 | |
555 | return HRTIMER_NORESTART; | |
ffd980f9 OH |
556 | } |
557 | ||
6e5c172c OH |
558 | /* |
559 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush | |
560 | */ | |
5b75c497 OH |
561 | static inline int bcm_rx_do_flush(struct bcm_op *op, int update, |
562 | unsigned int index) | |
6e5c172c OH |
563 | { |
564 | if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) { | |
565 | if (update) | |
566 | bcm_rx_changed(op, &op->last_frames[index]); | |
567 | return 1; | |
568 | } | |
569 | return 0; | |
570 | } | |
571 | ||
ffd980f9 | 572 | /* |
73e87e02 | 573 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
6e5c172c OH |
574 | * |
575 | * update == 0 : just check if throttled data is available (any irq context) | |
576 | * update == 1 : check and send throttled data to userspace (soft_irq context) | |
ffd980f9 | 577 | */ |
6e5c172c | 578 | static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
ffd980f9 | 579 | { |
73e87e02 | 580 | int updated = 0; |
ffd980f9 OH |
581 | |
582 | if (op->nframes > 1) { | |
5b75c497 | 583 | unsigned int i; |
73e87e02 | 584 | |
ffd980f9 | 585 | /* for MUX filter we start at index 1 */ |
6e5c172c OH |
586 | for (i = 1; i < op->nframes; i++) |
587 | updated += bcm_rx_do_flush(op, update, i); | |
ffd980f9 OH |
588 | |
589 | } else { | |
590 | /* for RX_FILTER_ID and simple filter */ | |
6e5c172c | 591 | updated += bcm_rx_do_flush(op, update, 0); |
ffd980f9 | 592 | } |
73e87e02 OH |
593 | |
594 | return updated; | |
595 | } | |
596 | ||
6e5c172c OH |
597 | static void bcm_rx_thr_tsklet(unsigned long data) |
598 | { | |
599 | struct bcm_op *op = (struct bcm_op *)data; | |
600 | ||
601 | /* push the changed data to the userspace */ | |
602 | bcm_rx_thr_flush(op, 1); | |
603 | } | |
604 | ||
73e87e02 OH |
605 | /* |
606 | * bcm_rx_thr_handler - the time for blocked content updates is over now: | |
607 | * Check for throttled data and send it to the userspace | |
608 | */ | |
609 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) | |
610 | { | |
611 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); | |
612 | ||
6e5c172c OH |
613 | tasklet_schedule(&op->thrtsklet); |
614 | ||
615 | if (bcm_rx_thr_flush(op, 0)) { | |
73e87e02 OH |
616 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
617 | return HRTIMER_RESTART; | |
618 | } else { | |
619 | /* rearm throttle handling */ | |
620 | op->kt_lastmsg = ktime_set(0, 0); | |
621 | return HRTIMER_NORESTART; | |
622 | } | |
ffd980f9 OH |
623 | } |
624 | ||
625 | /* | |
626 | * bcm_rx_handler - handle a CAN frame receiption | |
627 | */ | |
628 | static void bcm_rx_handler(struct sk_buff *skb, void *data) | |
629 | { | |
630 | struct bcm_op *op = (struct bcm_op *)data; | |
6e5c172c | 631 | const struct can_frame *rxframe = (struct can_frame *)skb->data; |
5b75c497 | 632 | unsigned int i; |
ffd980f9 OH |
633 | |
634 | /* disable timeout */ | |
73e87e02 | 635 | hrtimer_cancel(&op->timer); |
ffd980f9 | 636 | |
6e5c172c | 637 | if (op->can_id != rxframe->can_id) |
1fa17d4b | 638 | return; |
ffd980f9 | 639 | |
6e5c172c OH |
640 | /* save rx timestamp */ |
641 | op->rx_stamp = skb->tstamp; | |
642 | /* save originator for recvfrom() */ | |
643 | op->rx_ifindex = skb->dev->ifindex; | |
644 | /* update statistics */ | |
645 | op->frames_abs++; | |
ffd980f9 OH |
646 | |
647 | if (op->flags & RX_RTR_FRAME) { | |
648 | /* send reply for RTR-request (placed in op->frames[0]) */ | |
649 | bcm_can_tx(op); | |
1fa17d4b | 650 | return; |
ffd980f9 OH |
651 | } |
652 | ||
653 | if (op->flags & RX_FILTER_ID) { | |
654 | /* the easiest case */ | |
6e5c172c | 655 | bcm_rx_update_and_send(op, &op->last_frames[0], rxframe); |
1fa17d4b | 656 | goto rx_starttimer; |
ffd980f9 OH |
657 | } |
658 | ||
659 | if (op->nframes == 1) { | |
660 | /* simple compare with index 0 */ | |
6e5c172c | 661 | bcm_rx_cmp_to_index(op, 0, rxframe); |
1fa17d4b | 662 | goto rx_starttimer; |
ffd980f9 OH |
663 | } |
664 | ||
665 | if (op->nframes > 1) { | |
666 | /* | |
667 | * multiplex compare | |
668 | * | |
669 | * find the first multiplex mask that fits. | |
670 | * Remark: The MUX-mask is stored in index 0 | |
671 | */ | |
672 | ||
673 | for (i = 1; i < op->nframes; i++) { | |
6e5c172c | 674 | if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) == |
ffd980f9 OH |
675 | (GET_U64(&op->frames[0]) & |
676 | GET_U64(&op->frames[i]))) { | |
6e5c172c | 677 | bcm_rx_cmp_to_index(op, i, rxframe); |
ffd980f9 OH |
678 | break; |
679 | } | |
680 | } | |
ffd980f9 | 681 | } |
6e5c172c | 682 | |
1fa17d4b | 683 | rx_starttimer: |
6e5c172c | 684 | bcm_rx_starttimer(op); |
ffd980f9 OH |
685 | } |
686 | ||
687 | /* | |
688 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements | |
689 | */ | |
690 | static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id, | |
691 | int ifindex) | |
692 | { | |
693 | struct bcm_op *op; | |
694 | ||
695 | list_for_each_entry(op, ops, list) { | |
696 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) | |
697 | return op; | |
698 | } | |
699 | ||
700 | return NULL; | |
701 | } | |
702 | ||
703 | static void bcm_remove_op(struct bcm_op *op) | |
704 | { | |
73e87e02 OH |
705 | hrtimer_cancel(&op->timer); |
706 | hrtimer_cancel(&op->thrtimer); | |
ffd980f9 | 707 | |
6e5c172c OH |
708 | if (op->tsklet.func) |
709 | tasklet_kill(&op->tsklet); | |
710 | ||
711 | if (op->thrtsklet.func) | |
712 | tasklet_kill(&op->thrtsklet); | |
713 | ||
ffd980f9 OH |
714 | if ((op->frames) && (op->frames != &op->sframe)) |
715 | kfree(op->frames); | |
716 | ||
717 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) | |
718 | kfree(op->last_frames); | |
719 | ||
720 | kfree(op); | |
ffd980f9 OH |
721 | } |
722 | ||
723 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) | |
724 | { | |
725 | if (op->rx_reg_dev == dev) { | |
726 | can_rx_unregister(dev, op->can_id, REGMASK(op->can_id), | |
727 | bcm_rx_handler, op); | |
728 | ||
729 | /* mark as removed subscription */ | |
730 | op->rx_reg_dev = NULL; | |
731 | } else | |
732 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " | |
733 | "mismatch %p %p\n", op->rx_reg_dev, dev); | |
734 | } | |
735 | ||
736 | /* | |
737 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) | |
738 | */ | |
739 | static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex) | |
740 | { | |
741 | struct bcm_op *op, *n; | |
742 | ||
743 | list_for_each_entry_safe(op, n, ops, list) { | |
744 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) { | |
745 | ||
746 | /* | |
747 | * Don't care if we're bound or not (due to netdev | |
748 | * problems) can_rx_unregister() is always a save | |
749 | * thing to do here. | |
750 | */ | |
751 | if (op->ifindex) { | |
752 | /* | |
753 | * Only remove subscriptions that had not | |
754 | * been removed due to NETDEV_UNREGISTER | |
755 | * in bcm_notifier() | |
756 | */ | |
757 | if (op->rx_reg_dev) { | |
758 | struct net_device *dev; | |
759 | ||
760 | dev = dev_get_by_index(&init_net, | |
761 | op->ifindex); | |
762 | if (dev) { | |
763 | bcm_rx_unreg(dev, op); | |
764 | dev_put(dev); | |
765 | } | |
766 | } | |
767 | } else | |
768 | can_rx_unregister(NULL, op->can_id, | |
769 | REGMASK(op->can_id), | |
770 | bcm_rx_handler, op); | |
771 | ||
772 | list_del(&op->list); | |
773 | bcm_remove_op(op); | |
774 | return 1; /* done */ | |
775 | } | |
776 | } | |
777 | ||
778 | return 0; /* not found */ | |
779 | } | |
780 | ||
781 | /* | |
782 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) | |
783 | */ | |
784 | static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex) | |
785 | { | |
786 | struct bcm_op *op, *n; | |
787 | ||
788 | list_for_each_entry_safe(op, n, ops, list) { | |
789 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) { | |
790 | list_del(&op->list); | |
791 | bcm_remove_op(op); | |
792 | return 1; /* done */ | |
793 | } | |
794 | } | |
795 | ||
796 | return 0; /* not found */ | |
797 | } | |
798 | ||
799 | /* | |
800 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) | |
801 | */ | |
802 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, | |
803 | int ifindex) | |
804 | { | |
805 | struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex); | |
806 | ||
807 | if (!op) | |
808 | return -EINVAL; | |
809 | ||
810 | /* put current values into msg_head */ | |
811 | msg_head->flags = op->flags; | |
812 | msg_head->count = op->count; | |
813 | msg_head->ival1 = op->ival1; | |
814 | msg_head->ival2 = op->ival2; | |
815 | msg_head->nframes = op->nframes; | |
816 | ||
817 | bcm_send_to_user(op, msg_head, op->frames, 0); | |
818 | ||
819 | return MHSIZ; | |
820 | } | |
821 | ||
822 | /* | |
823 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) | |
824 | */ | |
825 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
826 | int ifindex, struct sock *sk) | |
827 | { | |
828 | struct bcm_sock *bo = bcm_sk(sk); | |
829 | struct bcm_op *op; | |
5b75c497 OH |
830 | unsigned int i; |
831 | int err; | |
ffd980f9 OH |
832 | |
833 | /* we need a real device to send frames */ | |
834 | if (!ifindex) | |
835 | return -ENODEV; | |
836 | ||
5b75c497 OH |
837 | /* check nframes boundaries - we need at least one can_frame */ |
838 | if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) | |
ffd980f9 OH |
839 | return -EINVAL; |
840 | ||
841 | /* check the given can_id */ | |
842 | op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex); | |
843 | ||
844 | if (op) { | |
845 | /* update existing BCM operation */ | |
846 | ||
847 | /* | |
848 | * Do we need more space for the can_frames than currently | |
849 | * allocated? -> This is a _really_ unusual use-case and | |
850 | * therefore (complexity / locking) it is not supported. | |
851 | */ | |
852 | if (msg_head->nframes > op->nframes) | |
853 | return -E2BIG; | |
854 | ||
855 | /* update can_frames content */ | |
856 | for (i = 0; i < msg_head->nframes; i++) { | |
857 | err = memcpy_fromiovec((u8 *)&op->frames[i], | |
858 | msg->msg_iov, CFSIZ); | |
7f2d38eb OH |
859 | |
860 | if (op->frames[i].can_dlc > 8) | |
861 | err = -EINVAL; | |
862 | ||
ffd980f9 OH |
863 | if (err < 0) |
864 | return err; | |
865 | ||
866 | if (msg_head->flags & TX_CP_CAN_ID) { | |
867 | /* copy can_id into frame */ | |
868 | op->frames[i].can_id = msg_head->can_id; | |
869 | } | |
870 | } | |
871 | ||
872 | } else { | |
873 | /* insert new BCM operation for the given can_id */ | |
874 | ||
875 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
876 | if (!op) | |
877 | return -ENOMEM; | |
878 | ||
879 | op->can_id = msg_head->can_id; | |
880 | ||
881 | /* create array for can_frames and copy the data */ | |
882 | if (msg_head->nframes > 1) { | |
883 | op->frames = kmalloc(msg_head->nframes * CFSIZ, | |
884 | GFP_KERNEL); | |
885 | if (!op->frames) { | |
886 | kfree(op); | |
887 | return -ENOMEM; | |
888 | } | |
889 | } else | |
890 | op->frames = &op->sframe; | |
891 | ||
892 | for (i = 0; i < msg_head->nframes; i++) { | |
893 | err = memcpy_fromiovec((u8 *)&op->frames[i], | |
894 | msg->msg_iov, CFSIZ); | |
7f2d38eb OH |
895 | |
896 | if (op->frames[i].can_dlc > 8) | |
897 | err = -EINVAL; | |
898 | ||
ffd980f9 OH |
899 | if (err < 0) { |
900 | if (op->frames != &op->sframe) | |
901 | kfree(op->frames); | |
902 | kfree(op); | |
903 | return err; | |
904 | } | |
905 | ||
906 | if (msg_head->flags & TX_CP_CAN_ID) { | |
907 | /* copy can_id into frame */ | |
908 | op->frames[i].can_id = msg_head->can_id; | |
909 | } | |
910 | } | |
911 | ||
912 | /* tx_ops never compare with previous received messages */ | |
913 | op->last_frames = NULL; | |
914 | ||
915 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
916 | op->sk = sk; | |
917 | op->ifindex = ifindex; | |
918 | ||
919 | /* initialize uninitialized (kzalloc) structure */ | |
73e87e02 OH |
920 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
921 | op->timer.function = bcm_tx_timeout_handler; | |
ffd980f9 | 922 | |
6e5c172c OH |
923 | /* initialize tasklet for tx countevent notification */ |
924 | tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, | |
925 | (unsigned long) op); | |
926 | ||
ffd980f9 | 927 | /* currently unused in tx_ops */ |
73e87e02 | 928 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffd980f9 OH |
929 | |
930 | /* add this bcm_op to the list of the tx_ops */ | |
931 | list_add(&op->list, &bo->tx_ops); | |
932 | ||
933 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ | |
934 | ||
935 | if (op->nframes != msg_head->nframes) { | |
936 | op->nframes = msg_head->nframes; | |
937 | /* start multiple frame transmission with index 0 */ | |
938 | op->currframe = 0; | |
939 | } | |
940 | ||
941 | /* check flags */ | |
942 | ||
943 | op->flags = msg_head->flags; | |
944 | ||
945 | if (op->flags & TX_RESET_MULTI_IDX) { | |
946 | /* start multiple frame transmission with index 0 */ | |
947 | op->currframe = 0; | |
948 | } | |
949 | ||
950 | if (op->flags & SETTIMER) { | |
951 | /* set timer values */ | |
952 | op->count = msg_head->count; | |
953 | op->ival1 = msg_head->ival1; | |
954 | op->ival2 = msg_head->ival2; | |
73e87e02 OH |
955 | op->kt_ival1 = timeval_to_ktime(msg_head->ival1); |
956 | op->kt_ival2 = timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
957 | |
958 | /* disable an active timer due to zero values? */ | |
73e87e02 OH |
959 | if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) |
960 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
961 | } |
962 | ||
12d0d0d3 OH |
963 | if (op->flags & STARTTIMER) { |
964 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
965 | /* spec: send can_frame when starting timer */ |
966 | op->flags |= TX_ANNOUNCE; | |
ffd980f9 OH |
967 | } |
968 | ||
aabdcb0b | 969 | if (op->flags & TX_ANNOUNCE) { |
ffd980f9 | 970 | bcm_can_tx(op); |
12d0d0d3 | 971 | if (op->count) |
aabdcb0b OH |
972 | op->count--; |
973 | } | |
ffd980f9 | 974 | |
12d0d0d3 OH |
975 | if (op->flags & STARTTIMER) |
976 | bcm_tx_start_timer(op); | |
977 | ||
ffd980f9 OH |
978 | return msg_head->nframes * CFSIZ + MHSIZ; |
979 | } | |
980 | ||
981 | /* | |
982 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) | |
983 | */ | |
984 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
985 | int ifindex, struct sock *sk) | |
986 | { | |
987 | struct bcm_sock *bo = bcm_sk(sk); | |
988 | struct bcm_op *op; | |
989 | int do_rx_register; | |
990 | int err = 0; | |
991 | ||
992 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { | |
993 | /* be robust against wrong usage ... */ | |
994 | msg_head->flags |= RX_FILTER_ID; | |
995 | /* ignore trailing garbage */ | |
996 | msg_head->nframes = 0; | |
997 | } | |
998 | ||
5b75c497 OH |
999 | /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ |
1000 | if (msg_head->nframes > MAX_NFRAMES + 1) | |
1001 | return -EINVAL; | |
1002 | ||
ffd980f9 OH |
1003 | if ((msg_head->flags & RX_RTR_FRAME) && |
1004 | ((msg_head->nframes != 1) || | |
1005 | (!(msg_head->can_id & CAN_RTR_FLAG)))) | |
1006 | return -EINVAL; | |
1007 | ||
1008 | /* check the given can_id */ | |
1009 | op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex); | |
1010 | if (op) { | |
1011 | /* update existing BCM operation */ | |
1012 | ||
1013 | /* | |
1014 | * Do we need more space for the can_frames than currently | |
1015 | * allocated? -> This is a _really_ unusual use-case and | |
1016 | * therefore (complexity / locking) it is not supported. | |
1017 | */ | |
1018 | if (msg_head->nframes > op->nframes) | |
1019 | return -E2BIG; | |
1020 | ||
1021 | if (msg_head->nframes) { | |
1022 | /* update can_frames content */ | |
1023 | err = memcpy_fromiovec((u8 *)op->frames, | |
1024 | msg->msg_iov, | |
1025 | msg_head->nframes * CFSIZ); | |
1026 | if (err < 0) | |
1027 | return err; | |
1028 | ||
1029 | /* clear last_frames to indicate 'nothing received' */ | |
1030 | memset(op->last_frames, 0, msg_head->nframes * CFSIZ); | |
1031 | } | |
1032 | ||
1033 | op->nframes = msg_head->nframes; | |
1034 | ||
1035 | /* Only an update -> do not call can_rx_register() */ | |
1036 | do_rx_register = 0; | |
1037 | ||
1038 | } else { | |
1039 | /* insert new BCM operation for the given can_id */ | |
1040 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
1041 | if (!op) | |
1042 | return -ENOMEM; | |
1043 | ||
1044 | op->can_id = msg_head->can_id; | |
1045 | op->nframes = msg_head->nframes; | |
1046 | ||
1047 | if (msg_head->nframes > 1) { | |
1048 | /* create array for can_frames and copy the data */ | |
1049 | op->frames = kmalloc(msg_head->nframes * CFSIZ, | |
1050 | GFP_KERNEL); | |
1051 | if (!op->frames) { | |
1052 | kfree(op); | |
1053 | return -ENOMEM; | |
1054 | } | |
1055 | ||
1056 | /* create and init array for received can_frames */ | |
1057 | op->last_frames = kzalloc(msg_head->nframes * CFSIZ, | |
1058 | GFP_KERNEL); | |
1059 | if (!op->last_frames) { | |
1060 | kfree(op->frames); | |
1061 | kfree(op); | |
1062 | return -ENOMEM; | |
1063 | } | |
1064 | ||
1065 | } else { | |
1066 | op->frames = &op->sframe; | |
1067 | op->last_frames = &op->last_sframe; | |
1068 | } | |
1069 | ||
1070 | if (msg_head->nframes) { | |
1071 | err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov, | |
1072 | msg_head->nframes * CFSIZ); | |
1073 | if (err < 0) { | |
1074 | if (op->frames != &op->sframe) | |
1075 | kfree(op->frames); | |
1076 | if (op->last_frames != &op->last_sframe) | |
1077 | kfree(op->last_frames); | |
1078 | kfree(op); | |
1079 | return err; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
1084 | op->sk = sk; | |
1085 | op->ifindex = ifindex; | |
1086 | ||
1087 | /* initialize uninitialized (kzalloc) structure */ | |
73e87e02 OH |
1088 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1089 | op->timer.function = bcm_rx_timeout_handler; | |
ffd980f9 | 1090 | |
6e5c172c OH |
1091 | /* initialize tasklet for rx timeout notification */ |
1092 | tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, | |
1093 | (unsigned long) op); | |
1094 | ||
73e87e02 OH |
1095 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1096 | op->thrtimer.function = bcm_rx_thr_handler; | |
ffd980f9 | 1097 | |
6e5c172c OH |
1098 | /* initialize tasklet for rx throttle handling */ |
1099 | tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, | |
1100 | (unsigned long) op); | |
1101 | ||
ffd980f9 OH |
1102 | /* add this bcm_op to the list of the rx_ops */ |
1103 | list_add(&op->list, &bo->rx_ops); | |
1104 | ||
1105 | /* call can_rx_register() */ | |
1106 | do_rx_register = 1; | |
1107 | ||
1108 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ | |
1109 | ||
1110 | /* check flags */ | |
1111 | op->flags = msg_head->flags; | |
1112 | ||
1113 | if (op->flags & RX_RTR_FRAME) { | |
1114 | ||
1115 | /* no timers in RTR-mode */ | |
73e87e02 OH |
1116 | hrtimer_cancel(&op->thrtimer); |
1117 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1118 | |
1119 | /* | |
1120 | * funny feature in RX(!)_SETUP only for RTR-mode: | |
1121 | * copy can_id into frame BUT without RTR-flag to | |
1122 | * prevent a full-load-loopback-test ... ;-] | |
1123 | */ | |
1124 | if ((op->flags & TX_CP_CAN_ID) || | |
1125 | (op->frames[0].can_id == op->can_id)) | |
1126 | op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG; | |
1127 | ||
1128 | } else { | |
1129 | if (op->flags & SETTIMER) { | |
1130 | ||
1131 | /* set timer value */ | |
1132 | op->ival1 = msg_head->ival1; | |
1133 | op->ival2 = msg_head->ival2; | |
73e87e02 OH |
1134 | op->kt_ival1 = timeval_to_ktime(msg_head->ival1); |
1135 | op->kt_ival2 = timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1136 | |
1137 | /* disable an active timer due to zero value? */ | |
73e87e02 OH |
1138 | if (!op->kt_ival1.tv64) |
1139 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1140 | |
1141 | /* | |
73e87e02 OH |
1142 | * In any case cancel the throttle timer, flush |
1143 | * potentially blocked msgs and reset throttle handling | |
ffd980f9 | 1144 | */ |
73e87e02 OH |
1145 | op->kt_lastmsg = ktime_set(0, 0); |
1146 | hrtimer_cancel(&op->thrtimer); | |
6e5c172c | 1147 | bcm_rx_thr_flush(op, 1); |
ffd980f9 OH |
1148 | } |
1149 | ||
73e87e02 OH |
1150 | if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) |
1151 | hrtimer_start(&op->timer, op->kt_ival1, | |
1152 | HRTIMER_MODE_REL); | |
ffd980f9 OH |
1153 | } |
1154 | ||
1155 | /* now we can register for can_ids, if we added a new bcm_op */ | |
1156 | if (do_rx_register) { | |
1157 | if (ifindex) { | |
1158 | struct net_device *dev; | |
1159 | ||
1160 | dev = dev_get_by_index(&init_net, ifindex); | |
1161 | if (dev) { | |
1162 | err = can_rx_register(dev, op->can_id, | |
1163 | REGMASK(op->can_id), | |
1164 | bcm_rx_handler, op, | |
1165 | "bcm"); | |
1166 | ||
1167 | op->rx_reg_dev = dev; | |
1168 | dev_put(dev); | |
1169 | } | |
1170 | ||
1171 | } else | |
1172 | err = can_rx_register(NULL, op->can_id, | |
1173 | REGMASK(op->can_id), | |
1174 | bcm_rx_handler, op, "bcm"); | |
1175 | if (err) { | |
1176 | /* this bcm rx op is broken -> remove it */ | |
1177 | list_del(&op->list); | |
1178 | bcm_remove_op(op); | |
1179 | return err; | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | return msg_head->nframes * CFSIZ + MHSIZ; | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) | |
1188 | */ | |
1189 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) | |
1190 | { | |
1191 | struct sk_buff *skb; | |
1192 | struct net_device *dev; | |
1193 | int err; | |
1194 | ||
1195 | /* we need a real device to send frames */ | |
1196 | if (!ifindex) | |
1197 | return -ENODEV; | |
1198 | ||
1199 | skb = alloc_skb(CFSIZ, GFP_KERNEL); | |
1200 | ||
1201 | if (!skb) | |
1202 | return -ENOMEM; | |
1203 | ||
1204 | err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ); | |
1205 | if (err < 0) { | |
1206 | kfree_skb(skb); | |
1207 | return err; | |
1208 | } | |
1209 | ||
1210 | dev = dev_get_by_index(&init_net, ifindex); | |
1211 | if (!dev) { | |
1212 | kfree_skb(skb); | |
1213 | return -ENODEV; | |
1214 | } | |
1215 | ||
1216 | skb->dev = dev; | |
1217 | skb->sk = sk; | |
7f2d38eb | 1218 | err = can_send(skb, 1); /* send with loopback */ |
ffd980f9 OH |
1219 | dev_put(dev); |
1220 | ||
7f2d38eb OH |
1221 | if (err) |
1222 | return err; | |
1223 | ||
ffd980f9 OH |
1224 | return CFSIZ + MHSIZ; |
1225 | } | |
1226 | ||
1227 | /* | |
1228 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace | |
1229 | */ | |
1230 | static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, | |
1231 | struct msghdr *msg, size_t size) | |
1232 | { | |
1233 | struct sock *sk = sock->sk; | |
1234 | struct bcm_sock *bo = bcm_sk(sk); | |
1235 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ | |
1236 | struct bcm_msg_head msg_head; | |
1237 | int ret; /* read bytes or error codes as return value */ | |
1238 | ||
1239 | if (!bo->bound) | |
1240 | return -ENOTCONN; | |
1241 | ||
7f2d38eb OH |
1242 | /* check for valid message length from userspace */ |
1243 | if (size < MHSIZ || (size - MHSIZ) % CFSIZ) | |
1244 | return -EINVAL; | |
1245 | ||
ffd980f9 OH |
1246 | /* check for alternative ifindex for this bcm_op */ |
1247 | ||
1248 | if (!ifindex && msg->msg_name) { | |
1249 | /* no bound device as default => check msg_name */ | |
1250 | struct sockaddr_can *addr = | |
1251 | (struct sockaddr_can *)msg->msg_name; | |
1252 | ||
5e507328 KVD |
1253 | if (msg->msg_namelen < sizeof(*addr)) |
1254 | return -EINVAL; | |
1255 | ||
ffd980f9 OH |
1256 | if (addr->can_family != AF_CAN) |
1257 | return -EINVAL; | |
1258 | ||
1259 | /* ifindex from sendto() */ | |
1260 | ifindex = addr->can_ifindex; | |
1261 | ||
1262 | if (ifindex) { | |
1263 | struct net_device *dev; | |
1264 | ||
1265 | dev = dev_get_by_index(&init_net, ifindex); | |
1266 | if (!dev) | |
1267 | return -ENODEV; | |
1268 | ||
1269 | if (dev->type != ARPHRD_CAN) { | |
1270 | dev_put(dev); | |
1271 | return -ENODEV; | |
1272 | } | |
1273 | ||
1274 | dev_put(dev); | |
1275 | } | |
1276 | } | |
1277 | ||
1278 | /* read message head information */ | |
1279 | ||
1280 | ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ); | |
1281 | if (ret < 0) | |
1282 | return ret; | |
1283 | ||
1284 | lock_sock(sk); | |
1285 | ||
1286 | switch (msg_head.opcode) { | |
1287 | ||
1288 | case TX_SETUP: | |
1289 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); | |
1290 | break; | |
1291 | ||
1292 | case RX_SETUP: | |
1293 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); | |
1294 | break; | |
1295 | ||
1296 | case TX_DELETE: | |
1297 | if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex)) | |
1298 | ret = MHSIZ; | |
1299 | else | |
1300 | ret = -EINVAL; | |
1301 | break; | |
1302 | ||
1303 | case RX_DELETE: | |
1304 | if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex)) | |
1305 | ret = MHSIZ; | |
1306 | else | |
1307 | ret = -EINVAL; | |
1308 | break; | |
1309 | ||
1310 | case TX_READ: | |
1311 | /* reuse msg_head for the reply to TX_READ */ | |
1312 | msg_head.opcode = TX_STATUS; | |
1313 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); | |
1314 | break; | |
1315 | ||
1316 | case RX_READ: | |
1317 | /* reuse msg_head for the reply to RX_READ */ | |
1318 | msg_head.opcode = RX_STATUS; | |
1319 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); | |
1320 | break; | |
1321 | ||
1322 | case TX_SEND: | |
7f2d38eb OH |
1323 | /* we need exactly one can_frame behind the msg head */ |
1324 | if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ)) | |
ffd980f9 OH |
1325 | ret = -EINVAL; |
1326 | else | |
1327 | ret = bcm_tx_send(msg, ifindex, sk); | |
1328 | break; | |
1329 | ||
1330 | default: | |
1331 | ret = -EINVAL; | |
1332 | break; | |
1333 | } | |
1334 | ||
1335 | release_sock(sk); | |
1336 | ||
1337 | return ret; | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * notification handler for netdevice status changes | |
1342 | */ | |
1343 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, | |
1344 | void *data) | |
1345 | { | |
1346 | struct net_device *dev = (struct net_device *)data; | |
1347 | struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); | |
1348 | struct sock *sk = &bo->sk; | |
1349 | struct bcm_op *op; | |
1350 | int notify_enodev = 0; | |
1351 | ||
721499e8 | 1352 | if (!net_eq(dev_net(dev), &init_net)) |
ffd980f9 OH |
1353 | return NOTIFY_DONE; |
1354 | ||
1355 | if (dev->type != ARPHRD_CAN) | |
1356 | return NOTIFY_DONE; | |
1357 | ||
1358 | switch (msg) { | |
1359 | ||
1360 | case NETDEV_UNREGISTER: | |
1361 | lock_sock(sk); | |
1362 | ||
1363 | /* remove device specific receive entries */ | |
1364 | list_for_each_entry(op, &bo->rx_ops, list) | |
1365 | if (op->rx_reg_dev == dev) | |
1366 | bcm_rx_unreg(dev, op); | |
1367 | ||
1368 | /* remove device reference, if this is our bound device */ | |
1369 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1370 | bo->bound = 0; | |
1371 | bo->ifindex = 0; | |
1372 | notify_enodev = 1; | |
1373 | } | |
1374 | ||
1375 | release_sock(sk); | |
1376 | ||
1377 | if (notify_enodev) { | |
1378 | sk->sk_err = ENODEV; | |
1379 | if (!sock_flag(sk, SOCK_DEAD)) | |
1380 | sk->sk_error_report(sk); | |
1381 | } | |
1382 | break; | |
1383 | ||
1384 | case NETDEV_DOWN: | |
1385 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1386 | sk->sk_err = ENETDOWN; | |
1387 | if (!sock_flag(sk, SOCK_DEAD)) | |
1388 | sk->sk_error_report(sk); | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | return NOTIFY_DONE; | |
1393 | } | |
1394 | ||
1395 | /* | |
1396 | * initial settings for all BCM sockets to be set at socket creation time | |
1397 | */ | |
1398 | static int bcm_init(struct sock *sk) | |
1399 | { | |
1400 | struct bcm_sock *bo = bcm_sk(sk); | |
1401 | ||
1402 | bo->bound = 0; | |
1403 | bo->ifindex = 0; | |
1404 | bo->dropped_usr_msgs = 0; | |
1405 | bo->bcm_proc_read = NULL; | |
1406 | ||
1407 | INIT_LIST_HEAD(&bo->tx_ops); | |
1408 | INIT_LIST_HEAD(&bo->rx_ops); | |
1409 | ||
1410 | /* set notifier */ | |
1411 | bo->notifier.notifier_call = bcm_notifier; | |
1412 | ||
1413 | register_netdevice_notifier(&bo->notifier); | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * standard socket functions | |
1420 | */ | |
1421 | static int bcm_release(struct socket *sock) | |
1422 | { | |
1423 | struct sock *sk = sock->sk; | |
c6914a6f | 1424 | struct bcm_sock *bo; |
ffd980f9 OH |
1425 | struct bcm_op *op, *next; |
1426 | ||
c6914a6f DJ |
1427 | if (sk == NULL) |
1428 | return 0; | |
1429 | ||
1430 | bo = bcm_sk(sk); | |
1431 | ||
ffd980f9 OH |
1432 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
1433 | ||
1434 | unregister_netdevice_notifier(&bo->notifier); | |
1435 | ||
1436 | lock_sock(sk); | |
1437 | ||
1438 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) | |
1439 | bcm_remove_op(op); | |
1440 | ||
1441 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { | |
1442 | /* | |
1443 | * Don't care if we're bound or not (due to netdev problems) | |
1444 | * can_rx_unregister() is always a save thing to do here. | |
1445 | */ | |
1446 | if (op->ifindex) { | |
1447 | /* | |
1448 | * Only remove subscriptions that had not | |
1449 | * been removed due to NETDEV_UNREGISTER | |
1450 | * in bcm_notifier() | |
1451 | */ | |
1452 | if (op->rx_reg_dev) { | |
1453 | struct net_device *dev; | |
1454 | ||
1455 | dev = dev_get_by_index(&init_net, op->ifindex); | |
1456 | if (dev) { | |
1457 | bcm_rx_unreg(dev, op); | |
1458 | dev_put(dev); | |
1459 | } | |
1460 | } | |
1461 | } else | |
1462 | can_rx_unregister(NULL, op->can_id, | |
1463 | REGMASK(op->can_id), | |
1464 | bcm_rx_handler, op); | |
1465 | ||
1466 | bcm_remove_op(op); | |
1467 | } | |
1468 | ||
1469 | /* remove procfs entry */ | |
1470 | if (proc_dir && bo->bcm_proc_read) | |
1471 | remove_proc_entry(bo->procname, proc_dir); | |
1472 | ||
1473 | /* remove device reference */ | |
1474 | if (bo->bound) { | |
1475 | bo->bound = 0; | |
1476 | bo->ifindex = 0; | |
1477 | } | |
1478 | ||
f7e5cc0c LW |
1479 | sock_orphan(sk); |
1480 | sock->sk = NULL; | |
1481 | ||
ffd980f9 OH |
1482 | release_sock(sk); |
1483 | sock_put(sk); | |
1484 | ||
1485 | return 0; | |
1486 | } | |
1487 | ||
1488 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, | |
1489 | int flags) | |
1490 | { | |
1491 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1492 | struct sock *sk = sock->sk; | |
1493 | struct bcm_sock *bo = bcm_sk(sk); | |
1494 | ||
6503d961 CG |
1495 | if (len < sizeof(*addr)) |
1496 | return -EINVAL; | |
1497 | ||
ffd980f9 OH |
1498 | if (bo->bound) |
1499 | return -EISCONN; | |
1500 | ||
1501 | /* bind a device to this socket */ | |
1502 | if (addr->can_ifindex) { | |
1503 | struct net_device *dev; | |
1504 | ||
1505 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
1506 | if (!dev) | |
1507 | return -ENODEV; | |
1508 | ||
1509 | if (dev->type != ARPHRD_CAN) { | |
1510 | dev_put(dev); | |
1511 | return -ENODEV; | |
1512 | } | |
1513 | ||
1514 | bo->ifindex = dev->ifindex; | |
1515 | dev_put(dev); | |
1516 | ||
1517 | } else { | |
1518 | /* no interface reference for ifindex = 0 ('any' CAN device) */ | |
1519 | bo->ifindex = 0; | |
1520 | } | |
1521 | ||
1522 | bo->bound = 1; | |
1523 | ||
1524 | if (proc_dir) { | |
1525 | /* unique socket address as filename */ | |
9f260e0e | 1526 | sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
ea00b8e2 AD |
1527 | bo->bcm_proc_read = proc_create_data(bo->procname, 0644, |
1528 | proc_dir, | |
1529 | &bcm_proc_fops, sk); | |
ffd980f9 OH |
1530 | } |
1531 | ||
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1536 | struct msghdr *msg, size_t size, int flags) | |
1537 | { | |
1538 | struct sock *sk = sock->sk; | |
1539 | struct sk_buff *skb; | |
1540 | int error = 0; | |
1541 | int noblock; | |
1542 | int err; | |
1543 | ||
1544 | noblock = flags & MSG_DONTWAIT; | |
1545 | flags &= ~MSG_DONTWAIT; | |
1546 | skb = skb_recv_datagram(sk, flags, noblock, &error); | |
1547 | if (!skb) | |
1548 | return error; | |
1549 | ||
1550 | if (skb->len < size) | |
1551 | size = skb->len; | |
1552 | ||
1553 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); | |
1554 | if (err < 0) { | |
1555 | skb_free_datagram(sk, skb); | |
1556 | return err; | |
1557 | } | |
1558 | ||
3b885787 | 1559 | sock_recv_ts_and_drops(msg, sk, skb); |
ffd980f9 OH |
1560 | |
1561 | if (msg->msg_name) { | |
1562 | msg->msg_namelen = sizeof(struct sockaddr_can); | |
1563 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1564 | } | |
1565 | ||
1566 | skb_free_datagram(sk, skb); | |
1567 | ||
1568 | return size; | |
1569 | } | |
1570 | ||
53914b67 | 1571 | static const struct proto_ops bcm_ops = { |
ffd980f9 OH |
1572 | .family = PF_CAN, |
1573 | .release = bcm_release, | |
1574 | .bind = sock_no_bind, | |
1575 | .connect = bcm_connect, | |
1576 | .socketpair = sock_no_socketpair, | |
1577 | .accept = sock_no_accept, | |
1578 | .getname = sock_no_getname, | |
1579 | .poll = datagram_poll, | |
53914b67 | 1580 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
ffd980f9 OH |
1581 | .listen = sock_no_listen, |
1582 | .shutdown = sock_no_shutdown, | |
1583 | .setsockopt = sock_no_setsockopt, | |
1584 | .getsockopt = sock_no_getsockopt, | |
1585 | .sendmsg = bcm_sendmsg, | |
1586 | .recvmsg = bcm_recvmsg, | |
1587 | .mmap = sock_no_mmap, | |
1588 | .sendpage = sock_no_sendpage, | |
1589 | }; | |
1590 | ||
1591 | static struct proto bcm_proto __read_mostly = { | |
1592 | .name = "CAN_BCM", | |
1593 | .owner = THIS_MODULE, | |
1594 | .obj_size = sizeof(struct bcm_sock), | |
1595 | .init = bcm_init, | |
1596 | }; | |
1597 | ||
1650629d | 1598 | static const struct can_proto bcm_can_proto = { |
ffd980f9 OH |
1599 | .type = SOCK_DGRAM, |
1600 | .protocol = CAN_BCM, | |
ffd980f9 OH |
1601 | .ops = &bcm_ops, |
1602 | .prot = &bcm_proto, | |
1603 | }; | |
1604 | ||
1605 | static int __init bcm_module_init(void) | |
1606 | { | |
1607 | int err; | |
1608 | ||
1609 | printk(banner); | |
1610 | ||
1611 | err = can_proto_register(&bcm_can_proto); | |
1612 | if (err < 0) { | |
1613 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); | |
1614 | return err; | |
1615 | } | |
1616 | ||
1617 | /* create /proc/net/can-bcm directory */ | |
1618 | proc_dir = proc_mkdir("can-bcm", init_net.proc_net); | |
ffd980f9 OH |
1619 | return 0; |
1620 | } | |
1621 | ||
1622 | static void __exit bcm_module_exit(void) | |
1623 | { | |
1624 | can_proto_unregister(&bcm_can_proto); | |
1625 | ||
1626 | if (proc_dir) | |
1627 | proc_net_remove(&init_net, "can-bcm"); | |
1628 | } | |
1629 | ||
1630 | module_init(bcm_module_init); | |
1631 | module_exit(bcm_module_exit); |