Commit | Line | Data |
---|---|---|
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 | * | |
40 | * Send feedback to <socketcan-users@lists.berlios.de> | |
41 | * | |
42 | */ | |
43 | ||
44 | #include <linux/module.h> | |
45 | #include <linux/init.h> | |
a6b7a407 | 46 | #include <linux/interrupt.h> |
73e87e02 | 47 | #include <linux/hrtimer.h> |
ffd980f9 OH |
48 | #include <linux/list.h> |
49 | #include <linux/proc_fs.h> | |
ea00b8e2 | 50 | #include <linux/seq_file.h> |
ffd980f9 OH |
51 | #include <linux/uio.h> |
52 | #include <linux/net.h> | |
53 | #include <linux/netdevice.h> | |
54 | #include <linux/socket.h> | |
55 | #include <linux/if_arp.h> | |
56 | #include <linux/skbuff.h> | |
57 | #include <linux/can.h> | |
58 | #include <linux/can/core.h> | |
59 | #include <linux/can/bcm.h> | |
5a0e3ad6 | 60 | #include <linux/slab.h> |
ffd980f9 OH |
61 | #include <net/sock.h> |
62 | #include <net/net_namespace.h> | |
63 | ||
5b75c497 OH |
64 | /* |
65 | * To send multiple CAN frame content within TX_SETUP or to filter | |
66 | * CAN messages with multiplex index within RX_SETUP, the number of | |
67 | * different filters is limited to 256 due to the one byte index value. | |
68 | */ | |
69 | #define MAX_NFRAMES 256 | |
70 | ||
ffd980f9 OH |
71 | /* use of last_frames[index].can_dlc */ |
72 | #define RX_RECV 0x40 /* received data for this element */ | |
73 | #define RX_THR 0x80 /* element not been sent due to throttle feature */ | |
74 | #define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */ | |
75 | ||
76 | /* get best masking value for can_rx_register() for a given single can_id */ | |
d253eee2 OH |
77 | #define REGMASK(id) ((id & CAN_EFF_FLAG) ? \ |
78 | (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ | |
79 | (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) | |
ffd980f9 | 80 | |
d253eee2 | 81 | #define CAN_BCM_VERSION CAN_VERSION |
ffd980f9 | 82 | static __initdata const char banner[] = KERN_INFO |
6e5c172c | 83 | "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"; |
ffd980f9 OH |
84 | |
85 | MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); | |
86 | MODULE_LICENSE("Dual BSD/GPL"); | |
87 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); | |
b13bb2e9 | 88 | MODULE_ALIAS("can-proto-2"); |
ffd980f9 OH |
89 | |
90 | /* easy access to can_frame payload */ | |
91 | static inline u64 GET_U64(const struct can_frame *cp) | |
92 | { | |
93 | return *(u64 *)cp->data; | |
94 | } | |
95 | ||
96 | struct bcm_op { | |
97 | struct list_head list; | |
98 | int ifindex; | |
99 | canid_t can_id; | |
5b75c497 | 100 | u32 flags; |
ffd980f9 | 101 | unsigned long frames_abs, frames_filtered; |
ffd980f9 | 102 | struct timeval ival1, ival2; |
73e87e02 | 103 | struct hrtimer timer, thrtimer; |
6e5c172c | 104 | struct tasklet_struct tsklet, thrtsklet; |
73e87e02 | 105 | ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; |
ffd980f9 | 106 | int rx_ifindex; |
5b75c497 OH |
107 | u32 count; |
108 | u32 nframes; | |
109 | u32 currframe; | |
ffd980f9 OH |
110 | struct can_frame *frames; |
111 | struct can_frame *last_frames; | |
112 | struct can_frame sframe; | |
113 | struct can_frame last_sframe; | |
114 | struct sock *sk; | |
115 | struct net_device *rx_reg_dev; | |
116 | }; | |
117 | ||
118 | static struct proc_dir_entry *proc_dir; | |
119 | ||
120 | struct bcm_sock { | |
121 | struct sock sk; | |
122 | int bound; | |
123 | int ifindex; | |
124 | struct notifier_block notifier; | |
125 | struct list_head rx_ops; | |
126 | struct list_head tx_ops; | |
127 | unsigned long dropped_usr_msgs; | |
128 | struct proc_dir_entry *bcm_proc_read; | |
9f260e0e | 129 | char procname [32]; /* inode number in decimal with \0 */ |
ffd980f9 OH |
130 | }; |
131 | ||
132 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) | |
133 | { | |
134 | return (struct bcm_sock *)sk; | |
135 | } | |
136 | ||
137 | #define CFSIZ sizeof(struct can_frame) | |
138 | #define OPSIZ sizeof(struct bcm_op) | |
139 | #define MHSIZ sizeof(struct bcm_msg_head) | |
140 | ||
ffd980f9 OH |
141 | /* |
142 | * procfs functions | |
143 | */ | |
6755aeba | 144 | static char *bcm_proc_getifname(char *result, int ifindex) |
ffd980f9 OH |
145 | { |
146 | struct net_device *dev; | |
147 | ||
148 | if (!ifindex) | |
149 | return "any"; | |
150 | ||
ff879eb6 | 151 | rcu_read_lock(); |
152 | dev = dev_get_by_index_rcu(&init_net, ifindex); | |
ffd980f9 | 153 | if (dev) |
6755aeba ED |
154 | strcpy(result, dev->name); |
155 | else | |
156 | strcpy(result, "???"); | |
ff879eb6 | 157 | rcu_read_unlock(); |
ffd980f9 | 158 | |
6755aeba | 159 | return result; |
ffd980f9 OH |
160 | } |
161 | ||
ea00b8e2 | 162 | static int bcm_proc_show(struct seq_file *m, void *v) |
ffd980f9 | 163 | { |
6755aeba | 164 | char ifname[IFNAMSIZ]; |
ea00b8e2 | 165 | struct sock *sk = (struct sock *)m->private; |
ffd980f9 OH |
166 | struct bcm_sock *bo = bcm_sk(sk); |
167 | struct bcm_op *op; | |
168 | ||
71338aa7 DR |
169 | seq_printf(m, ">>> socket %pK", sk->sk_socket); |
170 | seq_printf(m, " / sk %pK", sk); | |
171 | seq_printf(m, " / bo %pK", bo); | |
ea00b8e2 | 172 | seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); |
6755aeba | 173 | seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); |
ea00b8e2 | 174 | seq_printf(m, " <<<\n"); |
ffd980f9 OH |
175 | |
176 | list_for_each_entry(op, &bo->rx_ops, list) { | |
177 | ||
178 | unsigned long reduction; | |
179 | ||
180 | /* print only active entries & prevent division by zero */ | |
181 | if (!op->frames_abs) | |
182 | continue; | |
183 | ||
ea00b8e2 | 184 | seq_printf(m, "rx_op: %03X %-5s ", |
6755aeba | 185 | op->can_id, bcm_proc_getifname(ifname, op->ifindex)); |
5b75c497 | 186 | seq_printf(m, "[%u]%c ", op->nframes, |
ffd980f9 | 187 | (op->flags & RX_CHECK_DLC)?'d':' '); |
73e87e02 | 188 | if (op->kt_ival1.tv64) |
ea00b8e2 | 189 | seq_printf(m, "timeo=%lld ", |
73e87e02 OH |
190 | (long long) |
191 | ktime_to_us(op->kt_ival1)); | |
ffd980f9 | 192 | |
73e87e02 | 193 | if (op->kt_ival2.tv64) |
ea00b8e2 | 194 | seq_printf(m, "thr=%lld ", |
73e87e02 OH |
195 | (long long) |
196 | ktime_to_us(op->kt_ival2)); | |
ffd980f9 | 197 | |
ea00b8e2 | 198 | seq_printf(m, "# recv %ld (%ld) => reduction: ", |
ffd980f9 OH |
199 | op->frames_filtered, op->frames_abs); |
200 | ||
201 | reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; | |
202 | ||
ea00b8e2 | 203 | seq_printf(m, "%s%ld%%\n", |
ffd980f9 | 204 | (reduction == 100)?"near ":"", reduction); |
ffd980f9 OH |
205 | } |
206 | ||
207 | list_for_each_entry(op, &bo->tx_ops, list) { | |
208 | ||
5b75c497 | 209 | seq_printf(m, "tx_op: %03X %s [%u] ", |
6755aeba ED |
210 | op->can_id, |
211 | bcm_proc_getifname(ifname, op->ifindex), | |
ffd980f9 | 212 | op->nframes); |
ffd980f9 | 213 | |
73e87e02 | 214 | if (op->kt_ival1.tv64) |
ea00b8e2 | 215 | seq_printf(m, "t1=%lld ", |
73e87e02 OH |
216 | (long long) ktime_to_us(op->kt_ival1)); |
217 | ||
218 | if (op->kt_ival2.tv64) | |
ea00b8e2 | 219 | seq_printf(m, "t2=%lld ", |
73e87e02 | 220 | (long long) ktime_to_us(op->kt_ival2)); |
ffd980f9 | 221 | |
ea00b8e2 | 222 | seq_printf(m, "# sent %ld\n", op->frames_abs); |
ffd980f9 | 223 | } |
ea00b8e2 AD |
224 | seq_putc(m, '\n'); |
225 | return 0; | |
226 | } | |
ffd980f9 | 227 | |
ea00b8e2 AD |
228 | static int bcm_proc_open(struct inode *inode, struct file *file) |
229 | { | |
230 | return single_open(file, bcm_proc_show, PDE(inode)->data); | |
ffd980f9 OH |
231 | } |
232 | ||
ea00b8e2 AD |
233 | static const struct file_operations bcm_proc_fops = { |
234 | .owner = THIS_MODULE, | |
235 | .open = bcm_proc_open, | |
236 | .read = seq_read, | |
237 | .llseek = seq_lseek, | |
238 | .release = single_release, | |
239 | }; | |
240 | ||
ffd980f9 OH |
241 | /* |
242 | * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface | |
243 | * of the given bcm tx op | |
244 | */ | |
245 | static void bcm_can_tx(struct bcm_op *op) | |
246 | { | |
247 | struct sk_buff *skb; | |
248 | struct net_device *dev; | |
249 | struct can_frame *cf = &op->frames[op->currframe]; | |
250 | ||
251 | /* no target device? => exit */ | |
252 | if (!op->ifindex) | |
253 | return; | |
254 | ||
255 | dev = dev_get_by_index(&init_net, op->ifindex); | |
256 | if (!dev) { | |
257 | /* RFC: should this bcm_op remove itself here? */ | |
258 | return; | |
259 | } | |
260 | ||
261 | skb = alloc_skb(CFSIZ, gfp_any()); | |
262 | if (!skb) | |
263 | goto out; | |
264 | ||
265 | memcpy(skb_put(skb, CFSIZ), cf, CFSIZ); | |
266 | ||
267 | /* send with loopback */ | |
268 | skb->dev = dev; | |
269 | skb->sk = op->sk; | |
270 | can_send(skb, 1); | |
271 | ||
272 | /* update statistics */ | |
273 | op->currframe++; | |
274 | op->frames_abs++; | |
275 | ||
276 | /* reached last frame? */ | |
277 | if (op->currframe >= op->nframes) | |
278 | op->currframe = 0; | |
279 | out: | |
280 | dev_put(dev); | |
281 | } | |
282 | ||
283 | /* | |
284 | * bcm_send_to_user - send a BCM message to the userspace | |
285 | * (consisting of bcm_msg_head + x CAN frames) | |
286 | */ | |
287 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, | |
288 | struct can_frame *frames, int has_timestamp) | |
289 | { | |
290 | struct sk_buff *skb; | |
291 | struct can_frame *firstframe; | |
292 | struct sockaddr_can *addr; | |
293 | struct sock *sk = op->sk; | |
5b75c497 | 294 | unsigned int datalen = head->nframes * CFSIZ; |
ffd980f9 OH |
295 | int err; |
296 | ||
297 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); | |
298 | if (!skb) | |
299 | return; | |
300 | ||
301 | memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); | |
302 | ||
303 | if (head->nframes) { | |
304 | /* can_frames starting here */ | |
7f2d38eb | 305 | firstframe = (struct can_frame *)skb_tail_pointer(skb); |
ffd980f9 OH |
306 | |
307 | memcpy(skb_put(skb, datalen), frames, datalen); | |
308 | ||
309 | /* | |
310 | * the BCM uses the can_dlc-element of the can_frame | |
311 | * structure for internal purposes. This is only | |
312 | * relevant for updates that are generated by the | |
313 | * BCM, where nframes is 1 | |
314 | */ | |
315 | if (head->nframes == 1) | |
316 | firstframe->can_dlc &= BCM_CAN_DLC_MASK; | |
317 | } | |
318 | ||
319 | if (has_timestamp) { | |
320 | /* restore rx timestamp */ | |
321 | skb->tstamp = op->rx_stamp; | |
322 | } | |
323 | ||
324 | /* | |
325 | * Put the datagram to the queue so that bcm_recvmsg() can | |
326 | * get it from there. We need to pass the interface index to | |
327 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
328 | * containing the interface index. | |
329 | */ | |
330 | ||
331 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
332 | addr = (struct sockaddr_can *)skb->cb; | |
333 | memset(addr, 0, sizeof(*addr)); | |
334 | addr->can_family = AF_CAN; | |
335 | addr->can_ifindex = op->rx_ifindex; | |
336 | ||
337 | err = sock_queue_rcv_skb(sk, skb); | |
338 | if (err < 0) { | |
339 | struct bcm_sock *bo = bcm_sk(sk); | |
340 | ||
341 | kfree_skb(skb); | |
342 | /* don't care about overflows in this statistic */ | |
343 | bo->dropped_usr_msgs++; | |
344 | } | |
345 | } | |
346 | ||
6e5c172c OH |
347 | static void bcm_tx_timeout_tsklet(unsigned long data) |
348 | { | |
349 | struct bcm_op *op = (struct bcm_op *)data; | |
350 | struct bcm_msg_head msg_head; | |
351 | ||
73e87e02 | 352 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
ffd980f9 OH |
353 | |
354 | op->count--; | |
c53a6ee8 OH |
355 | if (!op->count && (op->flags & TX_COUNTEVT)) { |
356 | ||
357 | /* create notification to user */ | |
358 | msg_head.opcode = TX_EXPIRED; | |
359 | msg_head.flags = op->flags; | |
360 | msg_head.count = op->count; | |
361 | msg_head.ival1 = op->ival1; | |
362 | msg_head.ival2 = op->ival2; | |
363 | msg_head.can_id = op->can_id; | |
364 | msg_head.nframes = 0; | |
365 | ||
366 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
367 | } | |
ffd980f9 OH |
368 | } |
369 | ||
73e87e02 | 370 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
ffd980f9 OH |
371 | |
372 | /* send (next) frame */ | |
373 | bcm_can_tx(op); | |
c53a6ee8 OH |
374 | hrtimer_start(&op->timer, |
375 | ktime_add(ktime_get(), op->kt_ival1), | |
376 | HRTIMER_MODE_ABS); | |
ffd980f9 OH |
377 | |
378 | } else { | |
73e87e02 | 379 | if (op->kt_ival2.tv64) { |
ffd980f9 OH |
380 | |
381 | /* send (next) frame */ | |
382 | bcm_can_tx(op); | |
c53a6ee8 OH |
383 | hrtimer_start(&op->timer, |
384 | ktime_add(ktime_get(), op->kt_ival2), | |
385 | HRTIMER_MODE_ABS); | |
ffd980f9 OH |
386 | } |
387 | } | |
c53a6ee8 OH |
388 | } |
389 | ||
390 | /* | |
25985edc | 391 | * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions |
c53a6ee8 OH |
392 | */ |
393 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) | |
394 | { | |
395 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
396 | ||
397 | tasklet_schedule(&op->tsklet); | |
ffd980f9 | 398 | |
c53a6ee8 | 399 | return HRTIMER_NORESTART; |
ffd980f9 OH |
400 | } |
401 | ||
402 | /* | |
403 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content | |
404 | */ | |
405 | static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) | |
406 | { | |
407 | struct bcm_msg_head head; | |
408 | ||
ffd980f9 OH |
409 | /* update statistics */ |
410 | op->frames_filtered++; | |
411 | ||
412 | /* prevent statistics overflow */ | |
413 | if (op->frames_filtered > ULONG_MAX/100) | |
414 | op->frames_filtered = op->frames_abs = 0; | |
415 | ||
6e5c172c OH |
416 | /* this element is not throttled anymore */ |
417 | data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV); | |
418 | ||
ffd980f9 OH |
419 | head.opcode = RX_CHANGED; |
420 | head.flags = op->flags; | |
421 | head.count = op->count; | |
422 | head.ival1 = op->ival1; | |
423 | head.ival2 = op->ival2; | |
424 | head.can_id = op->can_id; | |
425 | head.nframes = 1; | |
426 | ||
427 | bcm_send_to_user(op, &head, data, 1); | |
428 | } | |
429 | ||
430 | /* | |
431 | * bcm_rx_update_and_send - process a detected relevant receive content change | |
432 | * 1. update the last received data | |
433 | * 2. send a notification to the user (if possible) | |
434 | */ | |
435 | static void bcm_rx_update_and_send(struct bcm_op *op, | |
436 | struct can_frame *lastdata, | |
6e5c172c | 437 | const struct can_frame *rxdata) |
ffd980f9 | 438 | { |
ffd980f9 OH |
439 | memcpy(lastdata, rxdata, CFSIZ); |
440 | ||
6e5c172c OH |
441 | /* mark as used and throttled by default */ |
442 | lastdata->can_dlc |= (RX_RECV|RX_THR); | |
ffd980f9 | 443 | |
6e5c172c OH |
444 | /* throtteling mode inactive ? */ |
445 | if (!op->kt_ival2.tv64) { | |
73e87e02 | 446 | /* send RX_CHANGED to the user immediately */ |
6e5c172c | 447 | bcm_rx_changed(op, lastdata); |
73e87e02 OH |
448 | return; |
449 | } | |
ffd980f9 | 450 | |
6e5c172c OH |
451 | /* with active throttling timer we are just done here */ |
452 | if (hrtimer_active(&op->thrtimer)) | |
73e87e02 | 453 | return; |
ffd980f9 | 454 | |
6e5c172c OH |
455 | /* first receiption with enabled throttling mode */ |
456 | if (!op->kt_lastmsg.tv64) | |
457 | goto rx_changed_settime; | |
73e87e02 | 458 | |
6e5c172c | 459 | /* got a second frame inside a potential throttle period? */ |
73e87e02 OH |
460 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
461 | ktime_to_us(op->kt_ival2)) { | |
6e5c172c | 462 | /* do not send the saved data - only start throttle timer */ |
73e87e02 OH |
463 | hrtimer_start(&op->thrtimer, |
464 | ktime_add(op->kt_lastmsg, op->kt_ival2), | |
465 | HRTIMER_MODE_ABS); | |
466 | return; | |
467 | } | |
468 | ||
469 | /* the gap was that big, that throttling was not needed here */ | |
6e5c172c OH |
470 | rx_changed_settime: |
471 | bcm_rx_changed(op, lastdata); | |
73e87e02 | 472 | op->kt_lastmsg = ktime_get(); |
ffd980f9 OH |
473 | } |
474 | ||
475 | /* | |
476 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly | |
477 | * received data stored in op->last_frames[] | |
478 | */ | |
5b75c497 | 479 | static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
6e5c172c | 480 | const struct can_frame *rxdata) |
ffd980f9 OH |
481 | { |
482 | /* | |
483 | * no one uses the MSBs of can_dlc for comparation, | |
484 | * so we use it here to detect the first time of reception | |
485 | */ | |
486 | ||
487 | if (!(op->last_frames[index].can_dlc & RX_RECV)) { | |
488 | /* received data for the first time => send update to user */ | |
489 | bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); | |
490 | return; | |
491 | } | |
492 | ||
493 | /* do a real check in can_frame data section */ | |
494 | ||
495 | if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) != | |
496 | (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) { | |
497 | bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); | |
498 | return; | |
499 | } | |
500 | ||
501 | if (op->flags & RX_CHECK_DLC) { | |
502 | /* do a real check in can_frame dlc */ | |
503 | if (rxdata->can_dlc != (op->last_frames[index].can_dlc & | |
504 | BCM_CAN_DLC_MASK)) { | |
505 | bcm_rx_update_and_send(op, &op->last_frames[index], | |
506 | rxdata); | |
507 | return; | |
508 | } | |
509 | } | |
510 | } | |
511 | ||
512 | /* | |
513 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption | |
514 | */ | |
515 | static void bcm_rx_starttimer(struct bcm_op *op) | |
516 | { | |
517 | if (op->flags & RX_NO_AUTOTIMER) | |
518 | return; | |
519 | ||
73e87e02 OH |
520 | if (op->kt_ival1.tv64) |
521 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); | |
ffd980f9 OH |
522 | } |
523 | ||
6e5c172c | 524 | static void bcm_rx_timeout_tsklet(unsigned long data) |
ffd980f9 | 525 | { |
6e5c172c | 526 | struct bcm_op *op = (struct bcm_op *)data; |
ffd980f9 OH |
527 | struct bcm_msg_head msg_head; |
528 | ||
6e5c172c | 529 | /* create notification to user */ |
ffd980f9 OH |
530 | msg_head.opcode = RX_TIMEOUT; |
531 | msg_head.flags = op->flags; | |
532 | msg_head.count = op->count; | |
533 | msg_head.ival1 = op->ival1; | |
534 | msg_head.ival2 = op->ival2; | |
535 | msg_head.can_id = op->can_id; | |
536 | msg_head.nframes = 0; | |
537 | ||
538 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
6e5c172c OH |
539 | } |
540 | ||
541 | /* | |
542 | * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out | |
543 | */ | |
544 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) | |
545 | { | |
546 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
547 | ||
548 | /* schedule before NET_RX_SOFTIRQ */ | |
549 | tasklet_hi_schedule(&op->tsklet); | |
ffd980f9 OH |
550 | |
551 | /* no restart of the timer is done here! */ | |
552 | ||
553 | /* if user wants to be informed, when cyclic CAN-Messages come back */ | |
554 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { | |
555 | /* clear received can_frames to indicate 'nothing received' */ | |
556 | memset(op->last_frames, 0, op->nframes * CFSIZ); | |
557 | } | |
73e87e02 OH |
558 | |
559 | return HRTIMER_NORESTART; | |
ffd980f9 OH |
560 | } |
561 | ||
6e5c172c OH |
562 | /* |
563 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush | |
564 | */ | |
5b75c497 OH |
565 | static inline int bcm_rx_do_flush(struct bcm_op *op, int update, |
566 | unsigned int index) | |
6e5c172c OH |
567 | { |
568 | if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) { | |
569 | if (update) | |
570 | bcm_rx_changed(op, &op->last_frames[index]); | |
571 | return 1; | |
572 | } | |
573 | return 0; | |
574 | } | |
575 | ||
ffd980f9 | 576 | /* |
73e87e02 | 577 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
6e5c172c OH |
578 | * |
579 | * update == 0 : just check if throttled data is available (any irq context) | |
580 | * update == 1 : check and send throttled data to userspace (soft_irq context) | |
ffd980f9 | 581 | */ |
6e5c172c | 582 | static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
ffd980f9 | 583 | { |
73e87e02 | 584 | int updated = 0; |
ffd980f9 OH |
585 | |
586 | if (op->nframes > 1) { | |
5b75c497 | 587 | unsigned int i; |
73e87e02 | 588 | |
ffd980f9 | 589 | /* for MUX filter we start at index 1 */ |
6e5c172c OH |
590 | for (i = 1; i < op->nframes; i++) |
591 | updated += bcm_rx_do_flush(op, update, i); | |
ffd980f9 OH |
592 | |
593 | } else { | |
594 | /* for RX_FILTER_ID and simple filter */ | |
6e5c172c | 595 | updated += bcm_rx_do_flush(op, update, 0); |
ffd980f9 | 596 | } |
73e87e02 OH |
597 | |
598 | return updated; | |
599 | } | |
600 | ||
6e5c172c OH |
601 | static void bcm_rx_thr_tsklet(unsigned long data) |
602 | { | |
603 | struct bcm_op *op = (struct bcm_op *)data; | |
604 | ||
605 | /* push the changed data to the userspace */ | |
606 | bcm_rx_thr_flush(op, 1); | |
607 | } | |
608 | ||
73e87e02 OH |
609 | /* |
610 | * bcm_rx_thr_handler - the time for blocked content updates is over now: | |
611 | * Check for throttled data and send it to the userspace | |
612 | */ | |
613 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) | |
614 | { | |
615 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); | |
616 | ||
6e5c172c OH |
617 | tasklet_schedule(&op->thrtsklet); |
618 | ||
619 | if (bcm_rx_thr_flush(op, 0)) { | |
73e87e02 OH |
620 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
621 | return HRTIMER_RESTART; | |
622 | } else { | |
623 | /* rearm throttle handling */ | |
624 | op->kt_lastmsg = ktime_set(0, 0); | |
625 | return HRTIMER_NORESTART; | |
626 | } | |
ffd980f9 OH |
627 | } |
628 | ||
629 | /* | |
630 | * bcm_rx_handler - handle a CAN frame receiption | |
631 | */ | |
632 | static void bcm_rx_handler(struct sk_buff *skb, void *data) | |
633 | { | |
634 | struct bcm_op *op = (struct bcm_op *)data; | |
6e5c172c | 635 | const struct can_frame *rxframe = (struct can_frame *)skb->data; |
5b75c497 | 636 | unsigned int i; |
ffd980f9 OH |
637 | |
638 | /* disable timeout */ | |
73e87e02 | 639 | hrtimer_cancel(&op->timer); |
ffd980f9 | 640 | |
6e5c172c | 641 | if (op->can_id != rxframe->can_id) |
1fa17d4b | 642 | return; |
ffd980f9 | 643 | |
6e5c172c OH |
644 | /* save rx timestamp */ |
645 | op->rx_stamp = skb->tstamp; | |
646 | /* save originator for recvfrom() */ | |
647 | op->rx_ifindex = skb->dev->ifindex; | |
648 | /* update statistics */ | |
649 | op->frames_abs++; | |
ffd980f9 OH |
650 | |
651 | if (op->flags & RX_RTR_FRAME) { | |
652 | /* send reply for RTR-request (placed in op->frames[0]) */ | |
653 | bcm_can_tx(op); | |
1fa17d4b | 654 | return; |
ffd980f9 OH |
655 | } |
656 | ||
657 | if (op->flags & RX_FILTER_ID) { | |
658 | /* the easiest case */ | |
6e5c172c | 659 | bcm_rx_update_and_send(op, &op->last_frames[0], rxframe); |
1fa17d4b | 660 | goto rx_starttimer; |
ffd980f9 OH |
661 | } |
662 | ||
663 | if (op->nframes == 1) { | |
664 | /* simple compare with index 0 */ | |
6e5c172c | 665 | bcm_rx_cmp_to_index(op, 0, rxframe); |
1fa17d4b | 666 | goto rx_starttimer; |
ffd980f9 OH |
667 | } |
668 | ||
669 | if (op->nframes > 1) { | |
670 | /* | |
671 | * multiplex compare | |
672 | * | |
673 | * find the first multiplex mask that fits. | |
674 | * Remark: The MUX-mask is stored in index 0 | |
675 | */ | |
676 | ||
677 | for (i = 1; i < op->nframes; i++) { | |
6e5c172c | 678 | if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) == |
ffd980f9 OH |
679 | (GET_U64(&op->frames[0]) & |
680 | GET_U64(&op->frames[i]))) { | |
6e5c172c | 681 | bcm_rx_cmp_to_index(op, i, rxframe); |
ffd980f9 OH |
682 | break; |
683 | } | |
684 | } | |
ffd980f9 | 685 | } |
6e5c172c | 686 | |
1fa17d4b | 687 | rx_starttimer: |
6e5c172c | 688 | bcm_rx_starttimer(op); |
ffd980f9 OH |
689 | } |
690 | ||
691 | /* | |
692 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements | |
693 | */ | |
694 | static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id, | |
695 | int ifindex) | |
696 | { | |
697 | struct bcm_op *op; | |
698 | ||
699 | list_for_each_entry(op, ops, list) { | |
700 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) | |
701 | return op; | |
702 | } | |
703 | ||
704 | return NULL; | |
705 | } | |
706 | ||
707 | static void bcm_remove_op(struct bcm_op *op) | |
708 | { | |
73e87e02 OH |
709 | hrtimer_cancel(&op->timer); |
710 | hrtimer_cancel(&op->thrtimer); | |
ffd980f9 | 711 | |
6e5c172c OH |
712 | if (op->tsklet.func) |
713 | tasklet_kill(&op->tsklet); | |
714 | ||
715 | if (op->thrtsklet.func) | |
716 | tasklet_kill(&op->thrtsklet); | |
717 | ||
ffd980f9 OH |
718 | if ((op->frames) && (op->frames != &op->sframe)) |
719 | kfree(op->frames); | |
720 | ||
721 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) | |
722 | kfree(op->last_frames); | |
723 | ||
724 | kfree(op); | |
ffd980f9 OH |
725 | } |
726 | ||
727 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) | |
728 | { | |
729 | if (op->rx_reg_dev == dev) { | |
730 | can_rx_unregister(dev, op->can_id, REGMASK(op->can_id), | |
731 | bcm_rx_handler, op); | |
732 | ||
733 | /* mark as removed subscription */ | |
734 | op->rx_reg_dev = NULL; | |
735 | } else | |
736 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " | |
737 | "mismatch %p %p\n", op->rx_reg_dev, dev); | |
738 | } | |
739 | ||
740 | /* | |
741 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) | |
742 | */ | |
743 | static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex) | |
744 | { | |
745 | struct bcm_op *op, *n; | |
746 | ||
747 | list_for_each_entry_safe(op, n, ops, list) { | |
748 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) { | |
749 | ||
750 | /* | |
751 | * Don't care if we're bound or not (due to netdev | |
752 | * problems) can_rx_unregister() is always a save | |
753 | * thing to do here. | |
754 | */ | |
755 | if (op->ifindex) { | |
756 | /* | |
757 | * Only remove subscriptions that had not | |
758 | * been removed due to NETDEV_UNREGISTER | |
759 | * in bcm_notifier() | |
760 | */ | |
761 | if (op->rx_reg_dev) { | |
762 | struct net_device *dev; | |
763 | ||
764 | dev = dev_get_by_index(&init_net, | |
765 | op->ifindex); | |
766 | if (dev) { | |
767 | bcm_rx_unreg(dev, op); | |
768 | dev_put(dev); | |
769 | } | |
770 | } | |
771 | } else | |
772 | can_rx_unregister(NULL, op->can_id, | |
773 | REGMASK(op->can_id), | |
774 | bcm_rx_handler, op); | |
775 | ||
776 | list_del(&op->list); | |
777 | bcm_remove_op(op); | |
778 | return 1; /* done */ | |
779 | } | |
780 | } | |
781 | ||
782 | return 0; /* not found */ | |
783 | } | |
784 | ||
785 | /* | |
786 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) | |
787 | */ | |
788 | static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex) | |
789 | { | |
790 | struct bcm_op *op, *n; | |
791 | ||
792 | list_for_each_entry_safe(op, n, ops, list) { | |
793 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) { | |
794 | list_del(&op->list); | |
795 | bcm_remove_op(op); | |
796 | return 1; /* done */ | |
797 | } | |
798 | } | |
799 | ||
800 | return 0; /* not found */ | |
801 | } | |
802 | ||
803 | /* | |
804 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) | |
805 | */ | |
806 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, | |
807 | int ifindex) | |
808 | { | |
809 | struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex); | |
810 | ||
811 | if (!op) | |
812 | return -EINVAL; | |
813 | ||
814 | /* put current values into msg_head */ | |
815 | msg_head->flags = op->flags; | |
816 | msg_head->count = op->count; | |
817 | msg_head->ival1 = op->ival1; | |
818 | msg_head->ival2 = op->ival2; | |
819 | msg_head->nframes = op->nframes; | |
820 | ||
821 | bcm_send_to_user(op, msg_head, op->frames, 0); | |
822 | ||
823 | return MHSIZ; | |
824 | } | |
825 | ||
826 | /* | |
827 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) | |
828 | */ | |
829 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
830 | int ifindex, struct sock *sk) | |
831 | { | |
832 | struct bcm_sock *bo = bcm_sk(sk); | |
833 | struct bcm_op *op; | |
5b75c497 OH |
834 | unsigned int i; |
835 | int err; | |
ffd980f9 OH |
836 | |
837 | /* we need a real device to send frames */ | |
838 | if (!ifindex) | |
839 | return -ENODEV; | |
840 | ||
5b75c497 OH |
841 | /* check nframes boundaries - we need at least one can_frame */ |
842 | if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) | |
ffd980f9 OH |
843 | return -EINVAL; |
844 | ||
845 | /* check the given can_id */ | |
846 | op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex); | |
847 | ||
848 | if (op) { | |
849 | /* update existing BCM operation */ | |
850 | ||
851 | /* | |
852 | * Do we need more space for the can_frames than currently | |
853 | * allocated? -> This is a _really_ unusual use-case and | |
854 | * therefore (complexity / locking) it is not supported. | |
855 | */ | |
856 | if (msg_head->nframes > op->nframes) | |
857 | return -E2BIG; | |
858 | ||
859 | /* update can_frames content */ | |
860 | for (i = 0; i < msg_head->nframes; i++) { | |
861 | err = memcpy_fromiovec((u8 *)&op->frames[i], | |
862 | msg->msg_iov, CFSIZ); | |
7f2d38eb OH |
863 | |
864 | if (op->frames[i].can_dlc > 8) | |
865 | err = -EINVAL; | |
866 | ||
ffd980f9 OH |
867 | if (err < 0) |
868 | return err; | |
869 | ||
870 | if (msg_head->flags & TX_CP_CAN_ID) { | |
871 | /* copy can_id into frame */ | |
872 | op->frames[i].can_id = msg_head->can_id; | |
873 | } | |
874 | } | |
875 | ||
876 | } else { | |
877 | /* insert new BCM operation for the given can_id */ | |
878 | ||
879 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
880 | if (!op) | |
881 | return -ENOMEM; | |
882 | ||
883 | op->can_id = msg_head->can_id; | |
884 | ||
885 | /* create array for can_frames and copy the data */ | |
886 | if (msg_head->nframes > 1) { | |
887 | op->frames = kmalloc(msg_head->nframes * CFSIZ, | |
888 | GFP_KERNEL); | |
889 | if (!op->frames) { | |
890 | kfree(op); | |
891 | return -ENOMEM; | |
892 | } | |
893 | } else | |
894 | op->frames = &op->sframe; | |
895 | ||
896 | for (i = 0; i < msg_head->nframes; i++) { | |
897 | err = memcpy_fromiovec((u8 *)&op->frames[i], | |
898 | msg->msg_iov, CFSIZ); | |
7f2d38eb OH |
899 | |
900 | if (op->frames[i].can_dlc > 8) | |
901 | err = -EINVAL; | |
902 | ||
ffd980f9 OH |
903 | if (err < 0) { |
904 | if (op->frames != &op->sframe) | |
905 | kfree(op->frames); | |
906 | kfree(op); | |
907 | return err; | |
908 | } | |
909 | ||
910 | if (msg_head->flags & TX_CP_CAN_ID) { | |
911 | /* copy can_id into frame */ | |
912 | op->frames[i].can_id = msg_head->can_id; | |
913 | } | |
914 | } | |
915 | ||
916 | /* tx_ops never compare with previous received messages */ | |
917 | op->last_frames = NULL; | |
918 | ||
919 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
920 | op->sk = sk; | |
921 | op->ifindex = ifindex; | |
922 | ||
923 | /* initialize uninitialized (kzalloc) structure */ | |
73e87e02 OH |
924 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
925 | op->timer.function = bcm_tx_timeout_handler; | |
ffd980f9 | 926 | |
6e5c172c OH |
927 | /* initialize tasklet for tx countevent notification */ |
928 | tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, | |
929 | (unsigned long) op); | |
930 | ||
ffd980f9 | 931 | /* currently unused in tx_ops */ |
73e87e02 | 932 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffd980f9 OH |
933 | |
934 | /* add this bcm_op to the list of the tx_ops */ | |
935 | list_add(&op->list, &bo->tx_ops); | |
936 | ||
937 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ | |
938 | ||
939 | if (op->nframes != msg_head->nframes) { | |
940 | op->nframes = msg_head->nframes; | |
941 | /* start multiple frame transmission with index 0 */ | |
942 | op->currframe = 0; | |
943 | } | |
944 | ||
945 | /* check flags */ | |
946 | ||
947 | op->flags = msg_head->flags; | |
948 | ||
949 | if (op->flags & TX_RESET_MULTI_IDX) { | |
950 | /* start multiple frame transmission with index 0 */ | |
951 | op->currframe = 0; | |
952 | } | |
953 | ||
954 | if (op->flags & SETTIMER) { | |
955 | /* set timer values */ | |
956 | op->count = msg_head->count; | |
957 | op->ival1 = msg_head->ival1; | |
958 | op->ival2 = msg_head->ival2; | |
73e87e02 OH |
959 | op->kt_ival1 = timeval_to_ktime(msg_head->ival1); |
960 | op->kt_ival2 = timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
961 | |
962 | /* disable an active timer due to zero values? */ | |
73e87e02 OH |
963 | if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) |
964 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
965 | } |
966 | ||
967 | if ((op->flags & STARTTIMER) && | |
73e87e02 | 968 | ((op->kt_ival1.tv64 && op->count) || op->kt_ival2.tv64)) { |
ffd980f9 OH |
969 | |
970 | /* spec: send can_frame when starting timer */ | |
971 | op->flags |= TX_ANNOUNCE; | |
972 | ||
73e87e02 | 973 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
ffd980f9 | 974 | /* op->count-- is done in bcm_tx_timeout_handler */ |
73e87e02 OH |
975 | hrtimer_start(&op->timer, op->kt_ival1, |
976 | HRTIMER_MODE_REL); | |
ffd980f9 | 977 | } else |
73e87e02 OH |
978 | hrtimer_start(&op->timer, op->kt_ival2, |
979 | HRTIMER_MODE_REL); | |
ffd980f9 OH |
980 | } |
981 | ||
982 | if (op->flags & TX_ANNOUNCE) | |
983 | bcm_can_tx(op); | |
984 | ||
985 | return msg_head->nframes * CFSIZ + MHSIZ; | |
986 | } | |
987 | ||
988 | /* | |
989 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) | |
990 | */ | |
991 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
992 | int ifindex, struct sock *sk) | |
993 | { | |
994 | struct bcm_sock *bo = bcm_sk(sk); | |
995 | struct bcm_op *op; | |
996 | int do_rx_register; | |
997 | int err = 0; | |
998 | ||
999 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { | |
1000 | /* be robust against wrong usage ... */ | |
1001 | msg_head->flags |= RX_FILTER_ID; | |
1002 | /* ignore trailing garbage */ | |
1003 | msg_head->nframes = 0; | |
1004 | } | |
1005 | ||
5b75c497 OH |
1006 | /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ |
1007 | if (msg_head->nframes > MAX_NFRAMES + 1) | |
1008 | return -EINVAL; | |
1009 | ||
ffd980f9 OH |
1010 | if ((msg_head->flags & RX_RTR_FRAME) && |
1011 | ((msg_head->nframes != 1) || | |
1012 | (!(msg_head->can_id & CAN_RTR_FLAG)))) | |
1013 | return -EINVAL; | |
1014 | ||
1015 | /* check the given can_id */ | |
1016 | op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex); | |
1017 | if (op) { | |
1018 | /* update existing BCM operation */ | |
1019 | ||
1020 | /* | |
1021 | * Do we need more space for the can_frames than currently | |
1022 | * allocated? -> This is a _really_ unusual use-case and | |
1023 | * therefore (complexity / locking) it is not supported. | |
1024 | */ | |
1025 | if (msg_head->nframes > op->nframes) | |
1026 | return -E2BIG; | |
1027 | ||
1028 | if (msg_head->nframes) { | |
1029 | /* update can_frames content */ | |
1030 | err = memcpy_fromiovec((u8 *)op->frames, | |
1031 | msg->msg_iov, | |
1032 | msg_head->nframes * CFSIZ); | |
1033 | if (err < 0) | |
1034 | return err; | |
1035 | ||
1036 | /* clear last_frames to indicate 'nothing received' */ | |
1037 | memset(op->last_frames, 0, msg_head->nframes * CFSIZ); | |
1038 | } | |
1039 | ||
1040 | op->nframes = msg_head->nframes; | |
1041 | ||
1042 | /* Only an update -> do not call can_rx_register() */ | |
1043 | do_rx_register = 0; | |
1044 | ||
1045 | } else { | |
1046 | /* insert new BCM operation for the given can_id */ | |
1047 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
1048 | if (!op) | |
1049 | return -ENOMEM; | |
1050 | ||
1051 | op->can_id = msg_head->can_id; | |
1052 | op->nframes = msg_head->nframes; | |
1053 | ||
1054 | if (msg_head->nframes > 1) { | |
1055 | /* create array for can_frames and copy the data */ | |
1056 | op->frames = kmalloc(msg_head->nframes * CFSIZ, | |
1057 | GFP_KERNEL); | |
1058 | if (!op->frames) { | |
1059 | kfree(op); | |
1060 | return -ENOMEM; | |
1061 | } | |
1062 | ||
1063 | /* create and init array for received can_frames */ | |
1064 | op->last_frames = kzalloc(msg_head->nframes * CFSIZ, | |
1065 | GFP_KERNEL); | |
1066 | if (!op->last_frames) { | |
1067 | kfree(op->frames); | |
1068 | kfree(op); | |
1069 | return -ENOMEM; | |
1070 | } | |
1071 | ||
1072 | } else { | |
1073 | op->frames = &op->sframe; | |
1074 | op->last_frames = &op->last_sframe; | |
1075 | } | |
1076 | ||
1077 | if (msg_head->nframes) { | |
1078 | err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov, | |
1079 | msg_head->nframes * CFSIZ); | |
1080 | if (err < 0) { | |
1081 | if (op->frames != &op->sframe) | |
1082 | kfree(op->frames); | |
1083 | if (op->last_frames != &op->last_sframe) | |
1084 | kfree(op->last_frames); | |
1085 | kfree(op); | |
1086 | return err; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
1091 | op->sk = sk; | |
1092 | op->ifindex = ifindex; | |
1093 | ||
1094 | /* initialize uninitialized (kzalloc) structure */ | |
73e87e02 OH |
1095 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1096 | op->timer.function = bcm_rx_timeout_handler; | |
ffd980f9 | 1097 | |
6e5c172c OH |
1098 | /* initialize tasklet for rx timeout notification */ |
1099 | tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, | |
1100 | (unsigned long) op); | |
1101 | ||
73e87e02 OH |
1102 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1103 | op->thrtimer.function = bcm_rx_thr_handler; | |
ffd980f9 | 1104 | |
6e5c172c OH |
1105 | /* initialize tasklet for rx throttle handling */ |
1106 | tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, | |
1107 | (unsigned long) op); | |
1108 | ||
ffd980f9 OH |
1109 | /* add this bcm_op to the list of the rx_ops */ |
1110 | list_add(&op->list, &bo->rx_ops); | |
1111 | ||
1112 | /* call can_rx_register() */ | |
1113 | do_rx_register = 1; | |
1114 | ||
1115 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ | |
1116 | ||
1117 | /* check flags */ | |
1118 | op->flags = msg_head->flags; | |
1119 | ||
1120 | if (op->flags & RX_RTR_FRAME) { | |
1121 | ||
1122 | /* no timers in RTR-mode */ | |
73e87e02 OH |
1123 | hrtimer_cancel(&op->thrtimer); |
1124 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1125 | |
1126 | /* | |
1127 | * funny feature in RX(!)_SETUP only for RTR-mode: | |
1128 | * copy can_id into frame BUT without RTR-flag to | |
1129 | * prevent a full-load-loopback-test ... ;-] | |
1130 | */ | |
1131 | if ((op->flags & TX_CP_CAN_ID) || | |
1132 | (op->frames[0].can_id == op->can_id)) | |
1133 | op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG; | |
1134 | ||
1135 | } else { | |
1136 | if (op->flags & SETTIMER) { | |
1137 | ||
1138 | /* set timer value */ | |
1139 | op->ival1 = msg_head->ival1; | |
1140 | op->ival2 = msg_head->ival2; | |
73e87e02 OH |
1141 | op->kt_ival1 = timeval_to_ktime(msg_head->ival1); |
1142 | op->kt_ival2 = timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1143 | |
1144 | /* disable an active timer due to zero value? */ | |
73e87e02 OH |
1145 | if (!op->kt_ival1.tv64) |
1146 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1147 | |
1148 | /* | |
73e87e02 OH |
1149 | * In any case cancel the throttle timer, flush |
1150 | * potentially blocked msgs and reset throttle handling | |
ffd980f9 | 1151 | */ |
73e87e02 OH |
1152 | op->kt_lastmsg = ktime_set(0, 0); |
1153 | hrtimer_cancel(&op->thrtimer); | |
6e5c172c | 1154 | bcm_rx_thr_flush(op, 1); |
ffd980f9 OH |
1155 | } |
1156 | ||
73e87e02 OH |
1157 | if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) |
1158 | hrtimer_start(&op->timer, op->kt_ival1, | |
1159 | HRTIMER_MODE_REL); | |
ffd980f9 OH |
1160 | } |
1161 | ||
1162 | /* now we can register for can_ids, if we added a new bcm_op */ | |
1163 | if (do_rx_register) { | |
1164 | if (ifindex) { | |
1165 | struct net_device *dev; | |
1166 | ||
1167 | dev = dev_get_by_index(&init_net, ifindex); | |
1168 | if (dev) { | |
1169 | err = can_rx_register(dev, op->can_id, | |
1170 | REGMASK(op->can_id), | |
1171 | bcm_rx_handler, op, | |
1172 | "bcm"); | |
1173 | ||
1174 | op->rx_reg_dev = dev; | |
1175 | dev_put(dev); | |
1176 | } | |
1177 | ||
1178 | } else | |
1179 | err = can_rx_register(NULL, op->can_id, | |
1180 | REGMASK(op->can_id), | |
1181 | bcm_rx_handler, op, "bcm"); | |
1182 | if (err) { | |
1183 | /* this bcm rx op is broken -> remove it */ | |
1184 | list_del(&op->list); | |
1185 | bcm_remove_op(op); | |
1186 | return err; | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | return msg_head->nframes * CFSIZ + MHSIZ; | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) | |
1195 | */ | |
1196 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) | |
1197 | { | |
1198 | struct sk_buff *skb; | |
1199 | struct net_device *dev; | |
1200 | int err; | |
1201 | ||
1202 | /* we need a real device to send frames */ | |
1203 | if (!ifindex) | |
1204 | return -ENODEV; | |
1205 | ||
1206 | skb = alloc_skb(CFSIZ, GFP_KERNEL); | |
1207 | ||
1208 | if (!skb) | |
1209 | return -ENOMEM; | |
1210 | ||
1211 | err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ); | |
1212 | if (err < 0) { | |
1213 | kfree_skb(skb); | |
1214 | return err; | |
1215 | } | |
1216 | ||
1217 | dev = dev_get_by_index(&init_net, ifindex); | |
1218 | if (!dev) { | |
1219 | kfree_skb(skb); | |
1220 | return -ENODEV; | |
1221 | } | |
1222 | ||
1223 | skb->dev = dev; | |
1224 | skb->sk = sk; | |
7f2d38eb | 1225 | err = can_send(skb, 1); /* send with loopback */ |
ffd980f9 OH |
1226 | dev_put(dev); |
1227 | ||
7f2d38eb OH |
1228 | if (err) |
1229 | return err; | |
1230 | ||
ffd980f9 OH |
1231 | return CFSIZ + MHSIZ; |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace | |
1236 | */ | |
1237 | static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, | |
1238 | struct msghdr *msg, size_t size) | |
1239 | { | |
1240 | struct sock *sk = sock->sk; | |
1241 | struct bcm_sock *bo = bcm_sk(sk); | |
1242 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ | |
1243 | struct bcm_msg_head msg_head; | |
1244 | int ret; /* read bytes or error codes as return value */ | |
1245 | ||
1246 | if (!bo->bound) | |
1247 | return -ENOTCONN; | |
1248 | ||
7f2d38eb OH |
1249 | /* check for valid message length from userspace */ |
1250 | if (size < MHSIZ || (size - MHSIZ) % CFSIZ) | |
1251 | return -EINVAL; | |
1252 | ||
ffd980f9 OH |
1253 | /* check for alternative ifindex for this bcm_op */ |
1254 | ||
1255 | if (!ifindex && msg->msg_name) { | |
1256 | /* no bound device as default => check msg_name */ | |
1257 | struct sockaddr_can *addr = | |
1258 | (struct sockaddr_can *)msg->msg_name; | |
1259 | ||
5e507328 KVD |
1260 | if (msg->msg_namelen < sizeof(*addr)) |
1261 | return -EINVAL; | |
1262 | ||
ffd980f9 OH |
1263 | if (addr->can_family != AF_CAN) |
1264 | return -EINVAL; | |
1265 | ||
1266 | /* ifindex from sendto() */ | |
1267 | ifindex = addr->can_ifindex; | |
1268 | ||
1269 | if (ifindex) { | |
1270 | struct net_device *dev; | |
1271 | ||
1272 | dev = dev_get_by_index(&init_net, ifindex); | |
1273 | if (!dev) | |
1274 | return -ENODEV; | |
1275 | ||
1276 | if (dev->type != ARPHRD_CAN) { | |
1277 | dev_put(dev); | |
1278 | return -ENODEV; | |
1279 | } | |
1280 | ||
1281 | dev_put(dev); | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | /* read message head information */ | |
1286 | ||
1287 | ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ); | |
1288 | if (ret < 0) | |
1289 | return ret; | |
1290 | ||
1291 | lock_sock(sk); | |
1292 | ||
1293 | switch (msg_head.opcode) { | |
1294 | ||
1295 | case TX_SETUP: | |
1296 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); | |
1297 | break; | |
1298 | ||
1299 | case RX_SETUP: | |
1300 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); | |
1301 | break; | |
1302 | ||
1303 | case TX_DELETE: | |
1304 | if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex)) | |
1305 | ret = MHSIZ; | |
1306 | else | |
1307 | ret = -EINVAL; | |
1308 | break; | |
1309 | ||
1310 | case RX_DELETE: | |
1311 | if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex)) | |
1312 | ret = MHSIZ; | |
1313 | else | |
1314 | ret = -EINVAL; | |
1315 | break; | |
1316 | ||
1317 | case TX_READ: | |
1318 | /* reuse msg_head for the reply to TX_READ */ | |
1319 | msg_head.opcode = TX_STATUS; | |
1320 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); | |
1321 | break; | |
1322 | ||
1323 | case RX_READ: | |
1324 | /* reuse msg_head for the reply to RX_READ */ | |
1325 | msg_head.opcode = RX_STATUS; | |
1326 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); | |
1327 | break; | |
1328 | ||
1329 | case TX_SEND: | |
7f2d38eb OH |
1330 | /* we need exactly one can_frame behind the msg head */ |
1331 | if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ)) | |
ffd980f9 OH |
1332 | ret = -EINVAL; |
1333 | else | |
1334 | ret = bcm_tx_send(msg, ifindex, sk); | |
1335 | break; | |
1336 | ||
1337 | default: | |
1338 | ret = -EINVAL; | |
1339 | break; | |
1340 | } | |
1341 | ||
1342 | release_sock(sk); | |
1343 | ||
1344 | return ret; | |
1345 | } | |
1346 | ||
1347 | /* | |
1348 | * notification handler for netdevice status changes | |
1349 | */ | |
1350 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, | |
1351 | void *data) | |
1352 | { | |
1353 | struct net_device *dev = (struct net_device *)data; | |
1354 | struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); | |
1355 | struct sock *sk = &bo->sk; | |
1356 | struct bcm_op *op; | |
1357 | int notify_enodev = 0; | |
1358 | ||
721499e8 | 1359 | if (!net_eq(dev_net(dev), &init_net)) |
ffd980f9 OH |
1360 | return NOTIFY_DONE; |
1361 | ||
1362 | if (dev->type != ARPHRD_CAN) | |
1363 | return NOTIFY_DONE; | |
1364 | ||
1365 | switch (msg) { | |
1366 | ||
1367 | case NETDEV_UNREGISTER: | |
1368 | lock_sock(sk); | |
1369 | ||
1370 | /* remove device specific receive entries */ | |
1371 | list_for_each_entry(op, &bo->rx_ops, list) | |
1372 | if (op->rx_reg_dev == dev) | |
1373 | bcm_rx_unreg(dev, op); | |
1374 | ||
1375 | /* remove device reference, if this is our bound device */ | |
1376 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1377 | bo->bound = 0; | |
1378 | bo->ifindex = 0; | |
1379 | notify_enodev = 1; | |
1380 | } | |
1381 | ||
1382 | release_sock(sk); | |
1383 | ||
1384 | if (notify_enodev) { | |
1385 | sk->sk_err = ENODEV; | |
1386 | if (!sock_flag(sk, SOCK_DEAD)) | |
1387 | sk->sk_error_report(sk); | |
1388 | } | |
1389 | break; | |
1390 | ||
1391 | case NETDEV_DOWN: | |
1392 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1393 | sk->sk_err = ENETDOWN; | |
1394 | if (!sock_flag(sk, SOCK_DEAD)) | |
1395 | sk->sk_error_report(sk); | |
1396 | } | |
1397 | } | |
1398 | ||
1399 | return NOTIFY_DONE; | |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * initial settings for all BCM sockets to be set at socket creation time | |
1404 | */ | |
1405 | static int bcm_init(struct sock *sk) | |
1406 | { | |
1407 | struct bcm_sock *bo = bcm_sk(sk); | |
1408 | ||
1409 | bo->bound = 0; | |
1410 | bo->ifindex = 0; | |
1411 | bo->dropped_usr_msgs = 0; | |
1412 | bo->bcm_proc_read = NULL; | |
1413 | ||
1414 | INIT_LIST_HEAD(&bo->tx_ops); | |
1415 | INIT_LIST_HEAD(&bo->rx_ops); | |
1416 | ||
1417 | /* set notifier */ | |
1418 | bo->notifier.notifier_call = bcm_notifier; | |
1419 | ||
1420 | register_netdevice_notifier(&bo->notifier); | |
1421 | ||
1422 | return 0; | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * standard socket functions | |
1427 | */ | |
1428 | static int bcm_release(struct socket *sock) | |
1429 | { | |
1430 | struct sock *sk = sock->sk; | |
c6914a6f | 1431 | struct bcm_sock *bo; |
ffd980f9 OH |
1432 | struct bcm_op *op, *next; |
1433 | ||
c6914a6f DJ |
1434 | if (sk == NULL) |
1435 | return 0; | |
1436 | ||
1437 | bo = bcm_sk(sk); | |
1438 | ||
ffd980f9 OH |
1439 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
1440 | ||
1441 | unregister_netdevice_notifier(&bo->notifier); | |
1442 | ||
1443 | lock_sock(sk); | |
1444 | ||
1445 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) | |
1446 | bcm_remove_op(op); | |
1447 | ||
1448 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { | |
1449 | /* | |
1450 | * Don't care if we're bound or not (due to netdev problems) | |
1451 | * can_rx_unregister() is always a save thing to do here. | |
1452 | */ | |
1453 | if (op->ifindex) { | |
1454 | /* | |
1455 | * Only remove subscriptions that had not | |
1456 | * been removed due to NETDEV_UNREGISTER | |
1457 | * in bcm_notifier() | |
1458 | */ | |
1459 | if (op->rx_reg_dev) { | |
1460 | struct net_device *dev; | |
1461 | ||
1462 | dev = dev_get_by_index(&init_net, op->ifindex); | |
1463 | if (dev) { | |
1464 | bcm_rx_unreg(dev, op); | |
1465 | dev_put(dev); | |
1466 | } | |
1467 | } | |
1468 | } else | |
1469 | can_rx_unregister(NULL, op->can_id, | |
1470 | REGMASK(op->can_id), | |
1471 | bcm_rx_handler, op); | |
1472 | ||
1473 | bcm_remove_op(op); | |
1474 | } | |
1475 | ||
1476 | /* remove procfs entry */ | |
1477 | if (proc_dir && bo->bcm_proc_read) | |
1478 | remove_proc_entry(bo->procname, proc_dir); | |
1479 | ||
1480 | /* remove device reference */ | |
1481 | if (bo->bound) { | |
1482 | bo->bound = 0; | |
1483 | bo->ifindex = 0; | |
1484 | } | |
1485 | ||
f7e5cc0c LW |
1486 | sock_orphan(sk); |
1487 | sock->sk = NULL; | |
1488 | ||
ffd980f9 OH |
1489 | release_sock(sk); |
1490 | sock_put(sk); | |
1491 | ||
1492 | return 0; | |
1493 | } | |
1494 | ||
1495 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, | |
1496 | int flags) | |
1497 | { | |
1498 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1499 | struct sock *sk = sock->sk; | |
1500 | struct bcm_sock *bo = bcm_sk(sk); | |
1501 | ||
6503d961 CG |
1502 | if (len < sizeof(*addr)) |
1503 | return -EINVAL; | |
1504 | ||
ffd980f9 OH |
1505 | if (bo->bound) |
1506 | return -EISCONN; | |
1507 | ||
1508 | /* bind a device to this socket */ | |
1509 | if (addr->can_ifindex) { | |
1510 | struct net_device *dev; | |
1511 | ||
1512 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
1513 | if (!dev) | |
1514 | return -ENODEV; | |
1515 | ||
1516 | if (dev->type != ARPHRD_CAN) { | |
1517 | dev_put(dev); | |
1518 | return -ENODEV; | |
1519 | } | |
1520 | ||
1521 | bo->ifindex = dev->ifindex; | |
1522 | dev_put(dev); | |
1523 | ||
1524 | } else { | |
1525 | /* no interface reference for ifindex = 0 ('any' CAN device) */ | |
1526 | bo->ifindex = 0; | |
1527 | } | |
1528 | ||
1529 | bo->bound = 1; | |
1530 | ||
1531 | if (proc_dir) { | |
1532 | /* unique socket address as filename */ | |
9f260e0e | 1533 | sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
ea00b8e2 AD |
1534 | bo->bcm_proc_read = proc_create_data(bo->procname, 0644, |
1535 | proc_dir, | |
1536 | &bcm_proc_fops, sk); | |
ffd980f9 OH |
1537 | } |
1538 | ||
1539 | return 0; | |
1540 | } | |
1541 | ||
1542 | static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1543 | struct msghdr *msg, size_t size, int flags) | |
1544 | { | |
1545 | struct sock *sk = sock->sk; | |
1546 | struct sk_buff *skb; | |
1547 | int error = 0; | |
1548 | int noblock; | |
1549 | int err; | |
1550 | ||
1551 | noblock = flags & MSG_DONTWAIT; | |
1552 | flags &= ~MSG_DONTWAIT; | |
1553 | skb = skb_recv_datagram(sk, flags, noblock, &error); | |
1554 | if (!skb) | |
1555 | return error; | |
1556 | ||
1557 | if (skb->len < size) | |
1558 | size = skb->len; | |
1559 | ||
1560 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); | |
1561 | if (err < 0) { | |
1562 | skb_free_datagram(sk, skb); | |
1563 | return err; | |
1564 | } | |
1565 | ||
3b885787 | 1566 | sock_recv_ts_and_drops(msg, sk, skb); |
ffd980f9 OH |
1567 | |
1568 | if (msg->msg_name) { | |
1569 | msg->msg_namelen = sizeof(struct sockaddr_can); | |
1570 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1571 | } | |
1572 | ||
1573 | skb_free_datagram(sk, skb); | |
1574 | ||
1575 | return size; | |
1576 | } | |
1577 | ||
53914b67 | 1578 | static const struct proto_ops bcm_ops = { |
ffd980f9 OH |
1579 | .family = PF_CAN, |
1580 | .release = bcm_release, | |
1581 | .bind = sock_no_bind, | |
1582 | .connect = bcm_connect, | |
1583 | .socketpair = sock_no_socketpair, | |
1584 | .accept = sock_no_accept, | |
1585 | .getname = sock_no_getname, | |
1586 | .poll = datagram_poll, | |
53914b67 | 1587 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
ffd980f9 OH |
1588 | .listen = sock_no_listen, |
1589 | .shutdown = sock_no_shutdown, | |
1590 | .setsockopt = sock_no_setsockopt, | |
1591 | .getsockopt = sock_no_getsockopt, | |
1592 | .sendmsg = bcm_sendmsg, | |
1593 | .recvmsg = bcm_recvmsg, | |
1594 | .mmap = sock_no_mmap, | |
1595 | .sendpage = sock_no_sendpage, | |
1596 | }; | |
1597 | ||
1598 | static struct proto bcm_proto __read_mostly = { | |
1599 | .name = "CAN_BCM", | |
1600 | .owner = THIS_MODULE, | |
1601 | .obj_size = sizeof(struct bcm_sock), | |
1602 | .init = bcm_init, | |
1603 | }; | |
1604 | ||
1650629d | 1605 | static const struct can_proto bcm_can_proto = { |
ffd980f9 OH |
1606 | .type = SOCK_DGRAM, |
1607 | .protocol = CAN_BCM, | |
ffd980f9 OH |
1608 | .ops = &bcm_ops, |
1609 | .prot = &bcm_proto, | |
1610 | }; | |
1611 | ||
1612 | static int __init bcm_module_init(void) | |
1613 | { | |
1614 | int err; | |
1615 | ||
1616 | printk(banner); | |
1617 | ||
1618 | err = can_proto_register(&bcm_can_proto); | |
1619 | if (err < 0) { | |
1620 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); | |
1621 | return err; | |
1622 | } | |
1623 | ||
1624 | /* create /proc/net/can-bcm directory */ | |
1625 | proc_dir = proc_mkdir("can-bcm", init_net.proc_net); | |
ffd980f9 OH |
1626 | return 0; |
1627 | } | |
1628 | ||
1629 | static void __exit bcm_module_exit(void) | |
1630 | { | |
1631 | can_proto_unregister(&bcm_can_proto); | |
1632 | ||
1633 | if (proc_dir) | |
1634 | proc_net_remove(&init_net, "can-bcm"); | |
1635 | } | |
1636 | ||
1637 | module_init(bcm_module_init); | |
1638 | module_exit(bcm_module_exit); |