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