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 | * | |
ffd980f9 OH |
40 | */ |
41 | ||
42 | #include <linux/module.h> | |
43 | #include <linux/init.h> | |
a6b7a407 | 44 | #include <linux/interrupt.h> |
73e87e02 | 45 | #include <linux/hrtimer.h> |
ffd980f9 OH |
46 | #include <linux/list.h> |
47 | #include <linux/proc_fs.h> | |
ea00b8e2 | 48 | #include <linux/seq_file.h> |
ffd980f9 OH |
49 | #include <linux/uio.h> |
50 | #include <linux/net.h> | |
51 | #include <linux/netdevice.h> | |
52 | #include <linux/socket.h> | |
53 | #include <linux/if_arp.h> | |
54 | #include <linux/skbuff.h> | |
55 | #include <linux/can.h> | |
56 | #include <linux/can/core.h> | |
156c2bb9 | 57 | #include <linux/can/skb.h> |
ffd980f9 | 58 | #include <linux/can/bcm.h> |
5a0e3ad6 | 59 | #include <linux/slab.h> |
ffd980f9 OH |
60 | #include <net/sock.h> |
61 | #include <net/net_namespace.h> | |
62 | ||
5b75c497 OH |
63 | /* |
64 | * To send multiple CAN frame content within TX_SETUP or to filter | |
65 | * CAN messages with multiplex index within RX_SETUP, the number of | |
66 | * different filters is limited to 256 due to the one byte index value. | |
67 | */ | |
68 | #define MAX_NFRAMES 256 | |
69 | ||
ffd980f9 OH |
70 | /* use of last_frames[index].can_dlc */ |
71 | #define RX_RECV 0x40 /* received data for this element */ | |
72 | #define RX_THR 0x80 /* element not been sent due to throttle feature */ | |
73 | #define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */ | |
74 | ||
75 | /* get best masking value for can_rx_register() for a given single can_id */ | |
d253eee2 OH |
76 | #define REGMASK(id) ((id & CAN_EFF_FLAG) ? \ |
77 | (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ | |
78 | (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) | |
ffd980f9 | 79 | |
d253eee2 | 80 | #define CAN_BCM_VERSION CAN_VERSION |
ffd980f9 OH |
81 | |
82 | MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); | |
83 | MODULE_LICENSE("Dual BSD/GPL"); | |
84 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); | |
b13bb2e9 | 85 | MODULE_ALIAS("can-proto-2"); |
ffd980f9 OH |
86 | |
87 | /* easy access to can_frame payload */ | |
88 | static inline u64 GET_U64(const struct can_frame *cp) | |
89 | { | |
90 | return *(u64 *)cp->data; | |
91 | } | |
92 | ||
93 | struct bcm_op { | |
94 | struct list_head list; | |
95 | int ifindex; | |
96 | canid_t can_id; | |
5b75c497 | 97 | u32 flags; |
ffd980f9 | 98 | unsigned long frames_abs, frames_filtered; |
ffd980f9 | 99 | struct timeval ival1, ival2; |
73e87e02 | 100 | struct hrtimer timer, thrtimer; |
6e5c172c | 101 | struct tasklet_struct tsklet, thrtsklet; |
73e87e02 | 102 | ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; |
ffd980f9 | 103 | int rx_ifindex; |
5b75c497 OH |
104 | u32 count; |
105 | u32 nframes; | |
106 | u32 currframe; | |
ffd980f9 OH |
107 | struct can_frame *frames; |
108 | struct can_frame *last_frames; | |
109 | struct can_frame sframe; | |
110 | struct can_frame last_sframe; | |
111 | struct sock *sk; | |
112 | struct net_device *rx_reg_dev; | |
113 | }; | |
114 | ||
115 | static struct proc_dir_entry *proc_dir; | |
116 | ||
117 | struct bcm_sock { | |
118 | struct sock sk; | |
119 | int bound; | |
120 | int ifindex; | |
121 | struct notifier_block notifier; | |
122 | struct list_head rx_ops; | |
123 | struct list_head tx_ops; | |
124 | unsigned long dropped_usr_msgs; | |
125 | struct proc_dir_entry *bcm_proc_read; | |
9f260e0e | 126 | char procname [32]; /* inode number in decimal with \0 */ |
ffd980f9 OH |
127 | }; |
128 | ||
129 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) | |
130 | { | |
131 | return (struct bcm_sock *)sk; | |
132 | } | |
133 | ||
134 | #define CFSIZ sizeof(struct can_frame) | |
135 | #define OPSIZ sizeof(struct bcm_op) | |
136 | #define MHSIZ sizeof(struct bcm_msg_head) | |
137 | ||
ffd980f9 OH |
138 | /* |
139 | * procfs functions | |
140 | */ | |
6755aeba | 141 | static char *bcm_proc_getifname(char *result, int ifindex) |
ffd980f9 OH |
142 | { |
143 | struct net_device *dev; | |
144 | ||
145 | if (!ifindex) | |
146 | return "any"; | |
147 | ||
ff879eb6 | 148 | rcu_read_lock(); |
149 | dev = dev_get_by_index_rcu(&init_net, ifindex); | |
ffd980f9 | 150 | if (dev) |
6755aeba ED |
151 | strcpy(result, dev->name); |
152 | else | |
153 | strcpy(result, "???"); | |
ff879eb6 | 154 | rcu_read_unlock(); |
ffd980f9 | 155 | |
6755aeba | 156 | return result; |
ffd980f9 OH |
157 | } |
158 | ||
ea00b8e2 | 159 | static int bcm_proc_show(struct seq_file *m, void *v) |
ffd980f9 | 160 | { |
6755aeba | 161 | char ifname[IFNAMSIZ]; |
ea00b8e2 | 162 | struct sock *sk = (struct sock *)m->private; |
ffd980f9 OH |
163 | struct bcm_sock *bo = bcm_sk(sk); |
164 | struct bcm_op *op; | |
165 | ||
71338aa7 DR |
166 | seq_printf(m, ">>> socket %pK", sk->sk_socket); |
167 | seq_printf(m, " / sk %pK", sk); | |
168 | seq_printf(m, " / bo %pK", bo); | |
ea00b8e2 | 169 | seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); |
6755aeba | 170 | seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); |
ea00b8e2 | 171 | seq_printf(m, " <<<\n"); |
ffd980f9 OH |
172 | |
173 | list_for_each_entry(op, &bo->rx_ops, list) { | |
174 | ||
175 | unsigned long reduction; | |
176 | ||
177 | /* print only active entries & prevent division by zero */ | |
178 | if (!op->frames_abs) | |
179 | continue; | |
180 | ||
ea00b8e2 | 181 | seq_printf(m, "rx_op: %03X %-5s ", |
6755aeba | 182 | op->can_id, bcm_proc_getifname(ifname, op->ifindex)); |
5b75c497 | 183 | seq_printf(m, "[%u]%c ", op->nframes, |
ffd980f9 | 184 | (op->flags & RX_CHECK_DLC)?'d':' '); |
73e87e02 | 185 | if (op->kt_ival1.tv64) |
ea00b8e2 | 186 | seq_printf(m, "timeo=%lld ", |
73e87e02 OH |
187 | (long long) |
188 | ktime_to_us(op->kt_ival1)); | |
ffd980f9 | 189 | |
73e87e02 | 190 | if (op->kt_ival2.tv64) |
ea00b8e2 | 191 | seq_printf(m, "thr=%lld ", |
73e87e02 OH |
192 | (long long) |
193 | ktime_to_us(op->kt_ival2)); | |
ffd980f9 | 194 | |
ea00b8e2 | 195 | seq_printf(m, "# recv %ld (%ld) => reduction: ", |
ffd980f9 OH |
196 | op->frames_filtered, op->frames_abs); |
197 | ||
198 | reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; | |
199 | ||
ea00b8e2 | 200 | seq_printf(m, "%s%ld%%\n", |
ffd980f9 | 201 | (reduction == 100)?"near ":"", reduction); |
ffd980f9 OH |
202 | } |
203 | ||
204 | list_for_each_entry(op, &bo->tx_ops, list) { | |
205 | ||
5b75c497 | 206 | seq_printf(m, "tx_op: %03X %s [%u] ", |
6755aeba ED |
207 | op->can_id, |
208 | bcm_proc_getifname(ifname, op->ifindex), | |
ffd980f9 | 209 | op->nframes); |
ffd980f9 | 210 | |
73e87e02 | 211 | if (op->kt_ival1.tv64) |
ea00b8e2 | 212 | seq_printf(m, "t1=%lld ", |
73e87e02 OH |
213 | (long long) ktime_to_us(op->kt_ival1)); |
214 | ||
215 | if (op->kt_ival2.tv64) | |
ea00b8e2 | 216 | seq_printf(m, "t2=%lld ", |
73e87e02 | 217 | (long long) ktime_to_us(op->kt_ival2)); |
ffd980f9 | 218 | |
ea00b8e2 | 219 | seq_printf(m, "# sent %ld\n", op->frames_abs); |
ffd980f9 | 220 | } |
ea00b8e2 AD |
221 | seq_putc(m, '\n'); |
222 | return 0; | |
223 | } | |
ffd980f9 | 224 | |
ea00b8e2 AD |
225 | static int bcm_proc_open(struct inode *inode, struct file *file) |
226 | { | |
d9dda78b | 227 | return single_open(file, bcm_proc_show, PDE_DATA(inode)); |
ffd980f9 OH |
228 | } |
229 | ||
ea00b8e2 AD |
230 | static const struct file_operations bcm_proc_fops = { |
231 | .owner = THIS_MODULE, | |
232 | .open = bcm_proc_open, | |
233 | .read = seq_read, | |
234 | .llseek = seq_lseek, | |
235 | .release = single_release, | |
236 | }; | |
237 | ||
ffd980f9 OH |
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 | ||
156c2bb9 | 258 | skb = alloc_skb(CFSIZ + sizeof(struct can_skb_priv), gfp_any()); |
ffd980f9 OH |
259 | if (!skb) |
260 | goto out; | |
261 | ||
2bf3440d OH |
262 | can_skb_reserve(skb); |
263 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 264 | can_skb_prv(skb)->skbcnt = 0; |
156c2bb9 | 265 | |
ffd980f9 OH |
266 | memcpy(skb_put(skb, CFSIZ), cf, CFSIZ); |
267 | ||
268 | /* send with loopback */ | |
269 | skb->dev = dev; | |
0ae89beb | 270 | can_skb_set_owner(skb, op->sk); |
ffd980f9 OH |
271 | can_send(skb, 1); |
272 | ||
273 | /* update statistics */ | |
274 | op->currframe++; | |
275 | op->frames_abs++; | |
276 | ||
277 | /* reached last frame? */ | |
278 | if (op->currframe >= op->nframes) | |
279 | op->currframe = 0; | |
280 | out: | |
281 | dev_put(dev); | |
282 | } | |
283 | ||
284 | /* | |
285 | * bcm_send_to_user - send a BCM message to the userspace | |
286 | * (consisting of bcm_msg_head + x CAN frames) | |
287 | */ | |
288 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, | |
289 | struct can_frame *frames, int has_timestamp) | |
290 | { | |
291 | struct sk_buff *skb; | |
292 | struct can_frame *firstframe; | |
293 | struct sockaddr_can *addr; | |
294 | struct sock *sk = op->sk; | |
5b75c497 | 295 | unsigned int datalen = head->nframes * CFSIZ; |
ffd980f9 OH |
296 | int err; |
297 | ||
298 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); | |
299 | if (!skb) | |
300 | return; | |
301 | ||
302 | memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); | |
303 | ||
304 | if (head->nframes) { | |
305 | /* can_frames starting here */ | |
7f2d38eb | 306 | firstframe = (struct can_frame *)skb_tail_pointer(skb); |
ffd980f9 OH |
307 | |
308 | memcpy(skb_put(skb, datalen), frames, datalen); | |
309 | ||
310 | /* | |
311 | * the BCM uses the can_dlc-element of the can_frame | |
312 | * structure for internal purposes. This is only | |
313 | * relevant for updates that are generated by the | |
314 | * BCM, where nframes is 1 | |
315 | */ | |
316 | if (head->nframes == 1) | |
317 | firstframe->can_dlc &= BCM_CAN_DLC_MASK; | |
318 | } | |
319 | ||
320 | if (has_timestamp) { | |
321 | /* restore rx timestamp */ | |
322 | skb->tstamp = op->rx_stamp; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Put the datagram to the queue so that bcm_recvmsg() can | |
327 | * get it from there. We need to pass the interface index to | |
328 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
329 | * containing the interface index. | |
330 | */ | |
331 | ||
b4772ef8 | 332 | sock_skb_cb_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
333 | addr = (struct sockaddr_can *)skb->cb; |
334 | memset(addr, 0, sizeof(*addr)); | |
335 | addr->can_family = AF_CAN; | |
336 | addr->can_ifindex = op->rx_ifindex; | |
337 | ||
338 | err = sock_queue_rcv_skb(sk, skb); | |
339 | if (err < 0) { | |
340 | struct bcm_sock *bo = bcm_sk(sk); | |
341 | ||
342 | kfree_skb(skb); | |
343 | /* don't care about overflows in this statistic */ | |
344 | bo->dropped_usr_msgs++; | |
345 | } | |
346 | } | |
347 | ||
12d0d0d3 OH |
348 | static void bcm_tx_start_timer(struct bcm_op *op) |
349 | { | |
350 | if (op->kt_ival1.tv64 && op->count) | |
351 | hrtimer_start(&op->timer, | |
352 | ktime_add(ktime_get(), op->kt_ival1), | |
353 | HRTIMER_MODE_ABS); | |
354 | else if (op->kt_ival2.tv64) | |
355 | hrtimer_start(&op->timer, | |
356 | ktime_add(ktime_get(), op->kt_ival2), | |
357 | HRTIMER_MODE_ABS); | |
358 | } | |
359 | ||
6e5c172c OH |
360 | static void bcm_tx_timeout_tsklet(unsigned long data) |
361 | { | |
362 | struct bcm_op *op = (struct bcm_op *)data; | |
363 | struct bcm_msg_head msg_head; | |
364 | ||
73e87e02 | 365 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
ffd980f9 OH |
366 | |
367 | op->count--; | |
c53a6ee8 OH |
368 | if (!op->count && (op->flags & TX_COUNTEVT)) { |
369 | ||
370 | /* create notification to user */ | |
371 | msg_head.opcode = TX_EXPIRED; | |
372 | msg_head.flags = op->flags; | |
373 | msg_head.count = op->count; | |
374 | msg_head.ival1 = op->ival1; | |
375 | msg_head.ival2 = op->ival2; | |
376 | msg_head.can_id = op->can_id; | |
377 | msg_head.nframes = 0; | |
378 | ||
379 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
380 | } | |
ffd980f9 | 381 | bcm_can_tx(op); |
ffd980f9 | 382 | |
12d0d0d3 OH |
383 | } else if (op->kt_ival2.tv64) |
384 | bcm_can_tx(op); | |
ffd980f9 | 385 | |
12d0d0d3 | 386 | bcm_tx_start_timer(op); |
c53a6ee8 OH |
387 | } |
388 | ||
389 | /* | |
25985edc | 390 | * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions |
c53a6ee8 OH |
391 | */ |
392 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) | |
393 | { | |
394 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
395 | ||
396 | tasklet_schedule(&op->tsklet); | |
ffd980f9 | 397 | |
c53a6ee8 | 398 | return HRTIMER_NORESTART; |
ffd980f9 OH |
399 | } |
400 | ||
401 | /* | |
402 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content | |
403 | */ | |
404 | static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) | |
405 | { | |
406 | struct bcm_msg_head head; | |
407 | ||
ffd980f9 OH |
408 | /* update statistics */ |
409 | op->frames_filtered++; | |
410 | ||
411 | /* prevent statistics overflow */ | |
412 | if (op->frames_filtered > ULONG_MAX/100) | |
413 | op->frames_filtered = op->frames_abs = 0; | |
414 | ||
6e5c172c OH |
415 | /* this element is not throttled anymore */ |
416 | data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV); | |
417 | ||
ffd980f9 OH |
418 | head.opcode = RX_CHANGED; |
419 | head.flags = op->flags; | |
420 | head.count = op->count; | |
421 | head.ival1 = op->ival1; | |
422 | head.ival2 = op->ival2; | |
423 | head.can_id = op->can_id; | |
424 | head.nframes = 1; | |
425 | ||
426 | bcm_send_to_user(op, &head, data, 1); | |
427 | } | |
428 | ||
429 | /* | |
430 | * bcm_rx_update_and_send - process a detected relevant receive content change | |
431 | * 1. update the last received data | |
432 | * 2. send a notification to the user (if possible) | |
433 | */ | |
434 | static void bcm_rx_update_and_send(struct bcm_op *op, | |
435 | struct can_frame *lastdata, | |
6e5c172c | 436 | const struct can_frame *rxdata) |
ffd980f9 | 437 | { |
ffd980f9 OH |
438 | memcpy(lastdata, rxdata, CFSIZ); |
439 | ||
6e5c172c OH |
440 | /* mark as used and throttled by default */ |
441 | lastdata->can_dlc |= (RX_RECV|RX_THR); | |
ffd980f9 | 442 | |
069f8457 | 443 | /* throttling mode inactive ? */ |
6e5c172c | 444 | if (!op->kt_ival2.tv64) { |
73e87e02 | 445 | /* send RX_CHANGED to the user immediately */ |
6e5c172c | 446 | bcm_rx_changed(op, lastdata); |
73e87e02 OH |
447 | return; |
448 | } | |
ffd980f9 | 449 | |
6e5c172c OH |
450 | /* with active throttling timer we are just done here */ |
451 | if (hrtimer_active(&op->thrtimer)) | |
73e87e02 | 452 | return; |
ffd980f9 | 453 | |
069f8457 | 454 | /* first reception with enabled throttling mode */ |
6e5c172c OH |
455 | if (!op->kt_lastmsg.tv64) |
456 | goto rx_changed_settime; | |
73e87e02 | 457 | |
6e5c172c | 458 | /* got a second frame inside a potential throttle period? */ |
73e87e02 OH |
459 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
460 | ktime_to_us(op->kt_ival2)) { | |
6e5c172c | 461 | /* do not send the saved data - only start throttle timer */ |
73e87e02 OH |
462 | hrtimer_start(&op->thrtimer, |
463 | ktime_add(op->kt_lastmsg, op->kt_ival2), | |
464 | HRTIMER_MODE_ABS); | |
465 | return; | |
466 | } | |
467 | ||
468 | /* the gap was that big, that throttling was not needed here */ | |
6e5c172c OH |
469 | rx_changed_settime: |
470 | bcm_rx_changed(op, lastdata); | |
73e87e02 | 471 | op->kt_lastmsg = ktime_get(); |
ffd980f9 OH |
472 | } |
473 | ||
474 | /* | |
475 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly | |
476 | * received data stored in op->last_frames[] | |
477 | */ | |
5b75c497 | 478 | static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
6e5c172c | 479 | const struct can_frame *rxdata) |
ffd980f9 OH |
480 | { |
481 | /* | |
069f8457 | 482 | * no one uses the MSBs of can_dlc for comparison, |
ffd980f9 OH |
483 | * so we use it here to detect the first time of reception |
484 | */ | |
485 | ||
486 | if (!(op->last_frames[index].can_dlc & RX_RECV)) { | |
487 | /* received data for the first time => send update to user */ | |
488 | bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); | |
489 | return; | |
490 | } | |
491 | ||
492 | /* do a real check in can_frame data section */ | |
493 | ||
494 | if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) != | |
495 | (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) { | |
496 | bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); | |
497 | return; | |
498 | } | |
499 | ||
500 | if (op->flags & RX_CHECK_DLC) { | |
501 | /* do a real check in can_frame dlc */ | |
502 | if (rxdata->can_dlc != (op->last_frames[index].can_dlc & | |
503 | BCM_CAN_DLC_MASK)) { | |
504 | bcm_rx_update_and_send(op, &op->last_frames[index], | |
505 | rxdata); | |
506 | return; | |
507 | } | |
508 | } | |
509 | } | |
510 | ||
511 | /* | |
069f8457 | 512 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame reception |
ffd980f9 OH |
513 | */ |
514 | static void bcm_rx_starttimer(struct bcm_op *op) | |
515 | { | |
516 | if (op->flags & RX_NO_AUTOTIMER) | |
517 | return; | |
518 | ||
73e87e02 OH |
519 | if (op->kt_ival1.tv64) |
520 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); | |
ffd980f9 OH |
521 | } |
522 | ||
6e5c172c | 523 | static void bcm_rx_timeout_tsklet(unsigned long data) |
ffd980f9 | 524 | { |
6e5c172c | 525 | struct bcm_op *op = (struct bcm_op *)data; |
ffd980f9 OH |
526 | struct bcm_msg_head msg_head; |
527 | ||
6e5c172c | 528 | /* create notification to user */ |
ffd980f9 OH |
529 | msg_head.opcode = RX_TIMEOUT; |
530 | msg_head.flags = op->flags; | |
531 | msg_head.count = op->count; | |
532 | msg_head.ival1 = op->ival1; | |
533 | msg_head.ival2 = op->ival2; | |
534 | msg_head.can_id = op->can_id; | |
535 | msg_head.nframes = 0; | |
536 | ||
537 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
6e5c172c OH |
538 | } |
539 | ||
540 | /* | |
069f8457 | 541 | * bcm_rx_timeout_handler - when the (cyclic) CAN frame reception timed out |
6e5c172c OH |
542 | */ |
543 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) | |
544 | { | |
545 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
546 | ||
547 | /* schedule before NET_RX_SOFTIRQ */ | |
548 | tasklet_hi_schedule(&op->tsklet); | |
ffd980f9 OH |
549 | |
550 | /* no restart of the timer is done here! */ | |
551 | ||
552 | /* if user wants to be informed, when cyclic CAN-Messages come back */ | |
553 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { | |
554 | /* clear received can_frames to indicate 'nothing received' */ | |
555 | memset(op->last_frames, 0, op->nframes * CFSIZ); | |
556 | } | |
73e87e02 OH |
557 | |
558 | return HRTIMER_NORESTART; | |
ffd980f9 OH |
559 | } |
560 | ||
6e5c172c OH |
561 | /* |
562 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush | |
563 | */ | |
5b75c497 OH |
564 | static inline int bcm_rx_do_flush(struct bcm_op *op, int update, |
565 | unsigned int index) | |
6e5c172c OH |
566 | { |
567 | if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) { | |
568 | if (update) | |
569 | bcm_rx_changed(op, &op->last_frames[index]); | |
570 | return 1; | |
571 | } | |
572 | return 0; | |
573 | } | |
574 | ||
ffd980f9 | 575 | /* |
73e87e02 | 576 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
6e5c172c OH |
577 | * |
578 | * update == 0 : just check if throttled data is available (any irq context) | |
579 | * update == 1 : check and send throttled data to userspace (soft_irq context) | |
ffd980f9 | 580 | */ |
6e5c172c | 581 | static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
ffd980f9 | 582 | { |
73e87e02 | 583 | int updated = 0; |
ffd980f9 OH |
584 | |
585 | if (op->nframes > 1) { | |
5b75c497 | 586 | unsigned int i; |
73e87e02 | 587 | |
ffd980f9 | 588 | /* for MUX filter we start at index 1 */ |
6e5c172c OH |
589 | for (i = 1; i < op->nframes; i++) |
590 | updated += bcm_rx_do_flush(op, update, i); | |
ffd980f9 OH |
591 | |
592 | } else { | |
593 | /* for RX_FILTER_ID and simple filter */ | |
6e5c172c | 594 | updated += bcm_rx_do_flush(op, update, 0); |
ffd980f9 | 595 | } |
73e87e02 OH |
596 | |
597 | return updated; | |
598 | } | |
599 | ||
6e5c172c OH |
600 | static void bcm_rx_thr_tsklet(unsigned long data) |
601 | { | |
602 | struct bcm_op *op = (struct bcm_op *)data; | |
603 | ||
604 | /* push the changed data to the userspace */ | |
605 | bcm_rx_thr_flush(op, 1); | |
606 | } | |
607 | ||
73e87e02 OH |
608 | /* |
609 | * bcm_rx_thr_handler - the time for blocked content updates is over now: | |
610 | * Check for throttled data and send it to the userspace | |
611 | */ | |
612 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) | |
613 | { | |
614 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); | |
615 | ||
6e5c172c OH |
616 | tasklet_schedule(&op->thrtsklet); |
617 | ||
618 | if (bcm_rx_thr_flush(op, 0)) { | |
73e87e02 OH |
619 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
620 | return HRTIMER_RESTART; | |
621 | } else { | |
622 | /* rearm throttle handling */ | |
623 | op->kt_lastmsg = ktime_set(0, 0); | |
624 | return HRTIMER_NORESTART; | |
625 | } | |
ffd980f9 OH |
626 | } |
627 | ||
628 | /* | |
069f8457 | 629 | * bcm_rx_handler - handle a CAN frame reception |
ffd980f9 OH |
630 | */ |
631 | static void bcm_rx_handler(struct sk_buff *skb, void *data) | |
632 | { | |
633 | struct bcm_op *op = (struct bcm_op *)data; | |
6e5c172c | 634 | const struct can_frame *rxframe = (struct can_frame *)skb->data; |
5b75c497 | 635 | unsigned int i; |
ffd980f9 OH |
636 | |
637 | /* disable timeout */ | |
73e87e02 | 638 | hrtimer_cancel(&op->timer); |
ffd980f9 | 639 | |
6e5c172c | 640 | if (op->can_id != rxframe->can_id) |
1fa17d4b | 641 | return; |
ffd980f9 | 642 | |
6e5c172c OH |
643 | /* save rx timestamp */ |
644 | op->rx_stamp = skb->tstamp; | |
645 | /* save originator for recvfrom() */ | |
646 | op->rx_ifindex = skb->dev->ifindex; | |
647 | /* update statistics */ | |
648 | op->frames_abs++; | |
ffd980f9 OH |
649 | |
650 | if (op->flags & RX_RTR_FRAME) { | |
651 | /* send reply for RTR-request (placed in op->frames[0]) */ | |
652 | bcm_can_tx(op); | |
1fa17d4b | 653 | return; |
ffd980f9 OH |
654 | } |
655 | ||
656 | if (op->flags & RX_FILTER_ID) { | |
657 | /* the easiest case */ | |
6e5c172c | 658 | bcm_rx_update_and_send(op, &op->last_frames[0], rxframe); |
1fa17d4b | 659 | goto rx_starttimer; |
ffd980f9 OH |
660 | } |
661 | ||
662 | if (op->nframes == 1) { | |
663 | /* simple compare with index 0 */ | |
6e5c172c | 664 | bcm_rx_cmp_to_index(op, 0, rxframe); |
1fa17d4b | 665 | goto rx_starttimer; |
ffd980f9 OH |
666 | } |
667 | ||
668 | if (op->nframes > 1) { | |
669 | /* | |
670 | * multiplex compare | |
671 | * | |
672 | * find the first multiplex mask that fits. | |
673 | * Remark: The MUX-mask is stored in index 0 | |
674 | */ | |
675 | ||
676 | for (i = 1; i < op->nframes; i++) { | |
6e5c172c | 677 | if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) == |
ffd980f9 OH |
678 | (GET_U64(&op->frames[0]) & |
679 | GET_U64(&op->frames[i]))) { | |
6e5c172c | 680 | bcm_rx_cmp_to_index(op, i, rxframe); |
ffd980f9 OH |
681 | break; |
682 | } | |
683 | } | |
ffd980f9 | 684 | } |
6e5c172c | 685 | |
1fa17d4b | 686 | rx_starttimer: |
6e5c172c | 687 | bcm_rx_starttimer(op); |
ffd980f9 OH |
688 | } |
689 | ||
690 | /* | |
691 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements | |
692 | */ | |
693 | static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id, | |
694 | int ifindex) | |
695 | { | |
696 | struct bcm_op *op; | |
697 | ||
698 | list_for_each_entry(op, ops, list) { | |
699 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) | |
700 | return op; | |
701 | } | |
702 | ||
703 | return NULL; | |
704 | } | |
705 | ||
706 | static void bcm_remove_op(struct bcm_op *op) | |
707 | { | |
73e87e02 OH |
708 | hrtimer_cancel(&op->timer); |
709 | hrtimer_cancel(&op->thrtimer); | |
ffd980f9 | 710 | |
6e5c172c OH |
711 | if (op->tsklet.func) |
712 | tasklet_kill(&op->tsklet); | |
713 | ||
714 | if (op->thrtsklet.func) | |
715 | tasklet_kill(&op->thrtsklet); | |
716 | ||
ffd980f9 OH |
717 | if ((op->frames) && (op->frames != &op->sframe)) |
718 | kfree(op->frames); | |
719 | ||
720 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) | |
721 | kfree(op->last_frames); | |
722 | ||
723 | kfree(op); | |
ffd980f9 OH |
724 | } |
725 | ||
726 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) | |
727 | { | |
728 | if (op->rx_reg_dev == dev) { | |
729 | can_rx_unregister(dev, op->can_id, REGMASK(op->can_id), | |
730 | bcm_rx_handler, op); | |
731 | ||
732 | /* mark as removed subscription */ | |
733 | op->rx_reg_dev = NULL; | |
734 | } else | |
735 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " | |
736 | "mismatch %p %p\n", op->rx_reg_dev, dev); | |
737 | } | |
738 | ||
739 | /* | |
740 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) | |
741 | */ | |
742 | static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex) | |
743 | { | |
744 | struct bcm_op *op, *n; | |
745 | ||
746 | list_for_each_entry_safe(op, n, ops, list) { | |
747 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) { | |
748 | ||
749 | /* | |
750 | * Don't care if we're bound or not (due to netdev | |
751 | * problems) can_rx_unregister() is always a save | |
752 | * thing to do here. | |
753 | */ | |
754 | if (op->ifindex) { | |
755 | /* | |
756 | * Only remove subscriptions that had not | |
757 | * been removed due to NETDEV_UNREGISTER | |
758 | * in bcm_notifier() | |
759 | */ | |
760 | if (op->rx_reg_dev) { | |
761 | struct net_device *dev; | |
762 | ||
763 | dev = dev_get_by_index(&init_net, | |
764 | op->ifindex); | |
765 | if (dev) { | |
766 | bcm_rx_unreg(dev, op); | |
767 | dev_put(dev); | |
768 | } | |
769 | } | |
770 | } else | |
771 | can_rx_unregister(NULL, op->can_id, | |
772 | REGMASK(op->can_id), | |
773 | bcm_rx_handler, op); | |
774 | ||
775 | list_del(&op->list); | |
776 | bcm_remove_op(op); | |
777 | return 1; /* done */ | |
778 | } | |
779 | } | |
780 | ||
781 | return 0; /* not found */ | |
782 | } | |
783 | ||
784 | /* | |
785 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) | |
786 | */ | |
787 | static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex) | |
788 | { | |
789 | struct bcm_op *op, *n; | |
790 | ||
791 | list_for_each_entry_safe(op, n, ops, list) { | |
792 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) { | |
793 | list_del(&op->list); | |
794 | bcm_remove_op(op); | |
795 | return 1; /* done */ | |
796 | } | |
797 | } | |
798 | ||
799 | return 0; /* not found */ | |
800 | } | |
801 | ||
802 | /* | |
803 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) | |
804 | */ | |
805 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, | |
806 | int ifindex) | |
807 | { | |
808 | struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex); | |
809 | ||
810 | if (!op) | |
811 | return -EINVAL; | |
812 | ||
813 | /* put current values into msg_head */ | |
814 | msg_head->flags = op->flags; | |
815 | msg_head->count = op->count; | |
816 | msg_head->ival1 = op->ival1; | |
817 | msg_head->ival2 = op->ival2; | |
818 | msg_head->nframes = op->nframes; | |
819 | ||
820 | bcm_send_to_user(op, msg_head, op->frames, 0); | |
821 | ||
822 | return MHSIZ; | |
823 | } | |
824 | ||
825 | /* | |
826 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) | |
827 | */ | |
828 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
829 | int ifindex, struct sock *sk) | |
830 | { | |
831 | struct bcm_sock *bo = bcm_sk(sk); | |
832 | struct bcm_op *op; | |
5b75c497 OH |
833 | unsigned int i; |
834 | int err; | |
ffd980f9 OH |
835 | |
836 | /* we need a real device to send frames */ | |
837 | if (!ifindex) | |
838 | return -ENODEV; | |
839 | ||
5b75c497 OH |
840 | /* check nframes boundaries - we need at least one can_frame */ |
841 | if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) | |
ffd980f9 OH |
842 | return -EINVAL; |
843 | ||
844 | /* check the given can_id */ | |
845 | op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex); | |
846 | ||
847 | if (op) { | |
848 | /* update existing BCM operation */ | |
849 | ||
850 | /* | |
851 | * Do we need more space for the can_frames than currently | |
852 | * allocated? -> This is a _really_ unusual use-case and | |
853 | * therefore (complexity / locking) it is not supported. | |
854 | */ | |
855 | if (msg_head->nframes > op->nframes) | |
856 | return -E2BIG; | |
857 | ||
858 | /* update can_frames content */ | |
859 | for (i = 0; i < msg_head->nframes; i++) { | |
6ce8e9ce | 860 | err = memcpy_from_msg((u8 *)&op->frames[i], msg, CFSIZ); |
7f2d38eb OH |
861 | |
862 | if (op->frames[i].can_dlc > 8) | |
863 | err = -EINVAL; | |
864 | ||
ffd980f9 OH |
865 | if (err < 0) |
866 | return err; | |
867 | ||
868 | if (msg_head->flags & TX_CP_CAN_ID) { | |
869 | /* copy can_id into frame */ | |
870 | op->frames[i].can_id = msg_head->can_id; | |
871 | } | |
872 | } | |
873 | ||
874 | } else { | |
875 | /* insert new BCM operation for the given can_id */ | |
876 | ||
877 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
878 | if (!op) | |
879 | return -ENOMEM; | |
880 | ||
881 | op->can_id = msg_head->can_id; | |
882 | ||
883 | /* create array for can_frames and copy the data */ | |
884 | if (msg_head->nframes > 1) { | |
885 | op->frames = kmalloc(msg_head->nframes * CFSIZ, | |
886 | GFP_KERNEL); | |
887 | if (!op->frames) { | |
888 | kfree(op); | |
889 | return -ENOMEM; | |
890 | } | |
891 | } else | |
892 | op->frames = &op->sframe; | |
893 | ||
894 | for (i = 0; i < msg_head->nframes; i++) { | |
6ce8e9ce | 895 | err = memcpy_from_msg((u8 *)&op->frames[i], msg, CFSIZ); |
7f2d38eb OH |
896 | |
897 | if (op->frames[i].can_dlc > 8) | |
898 | err = -EINVAL; | |
899 | ||
ffd980f9 OH |
900 | if (err < 0) { |
901 | if (op->frames != &op->sframe) | |
902 | kfree(op->frames); | |
903 | kfree(op); | |
904 | return err; | |
905 | } | |
906 | ||
907 | if (msg_head->flags & TX_CP_CAN_ID) { | |
908 | /* copy can_id into frame */ | |
909 | op->frames[i].can_id = msg_head->can_id; | |
910 | } | |
911 | } | |
912 | ||
913 | /* tx_ops never compare with previous received messages */ | |
914 | op->last_frames = NULL; | |
915 | ||
916 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
917 | op->sk = sk; | |
918 | op->ifindex = ifindex; | |
919 | ||
920 | /* initialize uninitialized (kzalloc) structure */ | |
73e87e02 OH |
921 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
922 | op->timer.function = bcm_tx_timeout_handler; | |
ffd980f9 | 923 | |
6e5c172c OH |
924 | /* initialize tasklet for tx countevent notification */ |
925 | tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, | |
926 | (unsigned long) op); | |
927 | ||
ffd980f9 | 928 | /* currently unused in tx_ops */ |
73e87e02 | 929 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffd980f9 OH |
930 | |
931 | /* add this bcm_op to the list of the tx_ops */ | |
932 | list_add(&op->list, &bo->tx_ops); | |
933 | ||
934 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ | |
935 | ||
936 | if (op->nframes != msg_head->nframes) { | |
937 | op->nframes = msg_head->nframes; | |
938 | /* start multiple frame transmission with index 0 */ | |
939 | op->currframe = 0; | |
940 | } | |
941 | ||
942 | /* check flags */ | |
943 | ||
944 | op->flags = msg_head->flags; | |
945 | ||
946 | if (op->flags & TX_RESET_MULTI_IDX) { | |
947 | /* start multiple frame transmission with index 0 */ | |
948 | op->currframe = 0; | |
949 | } | |
950 | ||
951 | if (op->flags & SETTIMER) { | |
952 | /* set timer values */ | |
953 | op->count = msg_head->count; | |
954 | op->ival1 = msg_head->ival1; | |
955 | op->ival2 = msg_head->ival2; | |
73e87e02 OH |
956 | op->kt_ival1 = timeval_to_ktime(msg_head->ival1); |
957 | op->kt_ival2 = timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
958 | |
959 | /* disable an active timer due to zero values? */ | |
73e87e02 OH |
960 | if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) |
961 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
962 | } |
963 | ||
12d0d0d3 OH |
964 | if (op->flags & STARTTIMER) { |
965 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
966 | /* spec: send can_frame when starting timer */ |
967 | op->flags |= TX_ANNOUNCE; | |
ffd980f9 OH |
968 | } |
969 | ||
aabdcb0b | 970 | if (op->flags & TX_ANNOUNCE) { |
ffd980f9 | 971 | bcm_can_tx(op); |
12d0d0d3 | 972 | if (op->count) |
aabdcb0b OH |
973 | op->count--; |
974 | } | |
ffd980f9 | 975 | |
12d0d0d3 OH |
976 | if (op->flags & STARTTIMER) |
977 | bcm_tx_start_timer(op); | |
978 | ||
ffd980f9 OH |
979 | return msg_head->nframes * CFSIZ + MHSIZ; |
980 | } | |
981 | ||
982 | /* | |
983 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) | |
984 | */ | |
985 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
986 | int ifindex, struct sock *sk) | |
987 | { | |
988 | struct bcm_sock *bo = bcm_sk(sk); | |
989 | struct bcm_op *op; | |
990 | int do_rx_register; | |
991 | int err = 0; | |
992 | ||
993 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { | |
994 | /* be robust against wrong usage ... */ | |
995 | msg_head->flags |= RX_FILTER_ID; | |
996 | /* ignore trailing garbage */ | |
997 | msg_head->nframes = 0; | |
998 | } | |
999 | ||
5b75c497 OH |
1000 | /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ |
1001 | if (msg_head->nframes > MAX_NFRAMES + 1) | |
1002 | return -EINVAL; | |
1003 | ||
ffd980f9 OH |
1004 | if ((msg_head->flags & RX_RTR_FRAME) && |
1005 | ((msg_head->nframes != 1) || | |
1006 | (!(msg_head->can_id & CAN_RTR_FLAG)))) | |
1007 | return -EINVAL; | |
1008 | ||
1009 | /* check the given can_id */ | |
1010 | op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex); | |
1011 | if (op) { | |
1012 | /* update existing BCM operation */ | |
1013 | ||
1014 | /* | |
1015 | * Do we need more space for the can_frames than currently | |
1016 | * allocated? -> This is a _really_ unusual use-case and | |
1017 | * therefore (complexity / locking) it is not supported. | |
1018 | */ | |
1019 | if (msg_head->nframes > op->nframes) | |
1020 | return -E2BIG; | |
1021 | ||
1022 | if (msg_head->nframes) { | |
1023 | /* update can_frames content */ | |
6ce8e9ce AV |
1024 | err = memcpy_from_msg((u8 *)op->frames, msg, |
1025 | msg_head->nframes * CFSIZ); | |
ffd980f9 OH |
1026 | if (err < 0) |
1027 | return err; | |
1028 | ||
1029 | /* clear last_frames to indicate 'nothing received' */ | |
1030 | memset(op->last_frames, 0, msg_head->nframes * CFSIZ); | |
1031 | } | |
1032 | ||
1033 | op->nframes = msg_head->nframes; | |
1034 | ||
1035 | /* Only an update -> do not call can_rx_register() */ | |
1036 | do_rx_register = 0; | |
1037 | ||
1038 | } else { | |
1039 | /* insert new BCM operation for the given can_id */ | |
1040 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
1041 | if (!op) | |
1042 | return -ENOMEM; | |
1043 | ||
1044 | op->can_id = msg_head->can_id; | |
1045 | op->nframes = msg_head->nframes; | |
1046 | ||
1047 | if (msg_head->nframes > 1) { | |
1048 | /* create array for can_frames and copy the data */ | |
1049 | op->frames = kmalloc(msg_head->nframes * CFSIZ, | |
1050 | GFP_KERNEL); | |
1051 | if (!op->frames) { | |
1052 | kfree(op); | |
1053 | return -ENOMEM; | |
1054 | } | |
1055 | ||
1056 | /* create and init array for received can_frames */ | |
1057 | op->last_frames = kzalloc(msg_head->nframes * CFSIZ, | |
1058 | GFP_KERNEL); | |
1059 | if (!op->last_frames) { | |
1060 | kfree(op->frames); | |
1061 | kfree(op); | |
1062 | return -ENOMEM; | |
1063 | } | |
1064 | ||
1065 | } else { | |
1066 | op->frames = &op->sframe; | |
1067 | op->last_frames = &op->last_sframe; | |
1068 | } | |
1069 | ||
1070 | if (msg_head->nframes) { | |
6ce8e9ce AV |
1071 | err = memcpy_from_msg((u8 *)op->frames, msg, |
1072 | msg_head->nframes * CFSIZ); | |
ffd980f9 OH |
1073 | if (err < 0) { |
1074 | if (op->frames != &op->sframe) | |
1075 | kfree(op->frames); | |
1076 | if (op->last_frames != &op->last_sframe) | |
1077 | kfree(op->last_frames); | |
1078 | kfree(op); | |
1079 | return err; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
1084 | op->sk = sk; | |
1085 | op->ifindex = ifindex; | |
1086 | ||
81b40110 OH |
1087 | /* ifindex for timeout events w/o previous frame reception */ |
1088 | op->rx_ifindex = ifindex; | |
1089 | ||
ffd980f9 | 1090 | /* initialize uninitialized (kzalloc) structure */ |
73e87e02 OH |
1091 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1092 | op->timer.function = bcm_rx_timeout_handler; | |
ffd980f9 | 1093 | |
6e5c172c OH |
1094 | /* initialize tasklet for rx timeout notification */ |
1095 | tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, | |
1096 | (unsigned long) op); | |
1097 | ||
73e87e02 OH |
1098 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1099 | op->thrtimer.function = bcm_rx_thr_handler; | |
ffd980f9 | 1100 | |
6e5c172c OH |
1101 | /* initialize tasklet for rx throttle handling */ |
1102 | tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, | |
1103 | (unsigned long) op); | |
1104 | ||
ffd980f9 OH |
1105 | /* add this bcm_op to the list of the rx_ops */ |
1106 | list_add(&op->list, &bo->rx_ops); | |
1107 | ||
1108 | /* call can_rx_register() */ | |
1109 | do_rx_register = 1; | |
1110 | ||
1111 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ | |
1112 | ||
1113 | /* check flags */ | |
1114 | op->flags = msg_head->flags; | |
1115 | ||
1116 | if (op->flags & RX_RTR_FRAME) { | |
1117 | ||
1118 | /* no timers in RTR-mode */ | |
73e87e02 OH |
1119 | hrtimer_cancel(&op->thrtimer); |
1120 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1121 | |
1122 | /* | |
1123 | * funny feature in RX(!)_SETUP only for RTR-mode: | |
1124 | * copy can_id into frame BUT without RTR-flag to | |
1125 | * prevent a full-load-loopback-test ... ;-] | |
1126 | */ | |
1127 | if ((op->flags & TX_CP_CAN_ID) || | |
1128 | (op->frames[0].can_id == op->can_id)) | |
1129 | op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG; | |
1130 | ||
1131 | } else { | |
1132 | if (op->flags & SETTIMER) { | |
1133 | ||
1134 | /* set timer value */ | |
1135 | op->ival1 = msg_head->ival1; | |
1136 | op->ival2 = msg_head->ival2; | |
73e87e02 OH |
1137 | op->kt_ival1 = timeval_to_ktime(msg_head->ival1); |
1138 | op->kt_ival2 = timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1139 | |
1140 | /* disable an active timer due to zero value? */ | |
73e87e02 OH |
1141 | if (!op->kt_ival1.tv64) |
1142 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1143 | |
1144 | /* | |
73e87e02 OH |
1145 | * In any case cancel the throttle timer, flush |
1146 | * potentially blocked msgs and reset throttle handling | |
ffd980f9 | 1147 | */ |
73e87e02 OH |
1148 | op->kt_lastmsg = ktime_set(0, 0); |
1149 | hrtimer_cancel(&op->thrtimer); | |
6e5c172c | 1150 | bcm_rx_thr_flush(op, 1); |
ffd980f9 OH |
1151 | } |
1152 | ||
73e87e02 OH |
1153 | if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) |
1154 | hrtimer_start(&op->timer, op->kt_ival1, | |
1155 | HRTIMER_MODE_REL); | |
ffd980f9 OH |
1156 | } |
1157 | ||
1158 | /* now we can register for can_ids, if we added a new bcm_op */ | |
1159 | if (do_rx_register) { | |
1160 | if (ifindex) { | |
1161 | struct net_device *dev; | |
1162 | ||
1163 | dev = dev_get_by_index(&init_net, ifindex); | |
1164 | if (dev) { | |
1165 | err = can_rx_register(dev, op->can_id, | |
1166 | REGMASK(op->can_id), | |
1167 | bcm_rx_handler, op, | |
1168 | "bcm"); | |
1169 | ||
1170 | op->rx_reg_dev = dev; | |
1171 | dev_put(dev); | |
1172 | } | |
1173 | ||
1174 | } else | |
1175 | err = can_rx_register(NULL, op->can_id, | |
1176 | REGMASK(op->can_id), | |
1177 | bcm_rx_handler, op, "bcm"); | |
1178 | if (err) { | |
1179 | /* this bcm rx op is broken -> remove it */ | |
1180 | list_del(&op->list); | |
1181 | bcm_remove_op(op); | |
1182 | return err; | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | return msg_head->nframes * CFSIZ + MHSIZ; | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) | |
1191 | */ | |
1192 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) | |
1193 | { | |
1194 | struct sk_buff *skb; | |
1195 | struct net_device *dev; | |
1196 | int err; | |
1197 | ||
1198 | /* we need a real device to send frames */ | |
1199 | if (!ifindex) | |
1200 | return -ENODEV; | |
1201 | ||
156c2bb9 | 1202 | skb = alloc_skb(CFSIZ + sizeof(struct can_skb_priv), GFP_KERNEL); |
ffd980f9 OH |
1203 | if (!skb) |
1204 | return -ENOMEM; | |
1205 | ||
2bf3440d | 1206 | can_skb_reserve(skb); |
156c2bb9 | 1207 | |
6ce8e9ce | 1208 | err = memcpy_from_msg(skb_put(skb, CFSIZ), msg, CFSIZ); |
ffd980f9 OH |
1209 | if (err < 0) { |
1210 | kfree_skb(skb); | |
1211 | return err; | |
1212 | } | |
1213 | ||
1214 | dev = dev_get_by_index(&init_net, ifindex); | |
1215 | if (!dev) { | |
1216 | kfree_skb(skb); | |
1217 | return -ENODEV; | |
1218 | } | |
1219 | ||
2bf3440d | 1220 | can_skb_prv(skb)->ifindex = dev->ifindex; |
d3b58c47 | 1221 | can_skb_prv(skb)->skbcnt = 0; |
ffd980f9 | 1222 | skb->dev = dev; |
0ae89beb | 1223 | can_skb_set_owner(skb, sk); |
7f2d38eb | 1224 | err = can_send(skb, 1); /* send with loopback */ |
ffd980f9 OH |
1225 | dev_put(dev); |
1226 | ||
7f2d38eb OH |
1227 | if (err) |
1228 | return err; | |
1229 | ||
ffd980f9 OH |
1230 | return CFSIZ + MHSIZ; |
1231 | } | |
1232 | ||
1233 | /* | |
1234 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace | |
1235 | */ | |
1b784140 | 1236 | static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
ffd980f9 OH |
1237 | { |
1238 | struct sock *sk = sock->sk; | |
1239 | struct bcm_sock *bo = bcm_sk(sk); | |
1240 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ | |
1241 | struct bcm_msg_head msg_head; | |
1242 | int ret; /* read bytes or error codes as return value */ | |
1243 | ||
1244 | if (!bo->bound) | |
1245 | return -ENOTCONN; | |
1246 | ||
7f2d38eb OH |
1247 | /* check for valid message length from userspace */ |
1248 | if (size < MHSIZ || (size - MHSIZ) % CFSIZ) | |
1249 | return -EINVAL; | |
1250 | ||
ffd980f9 OH |
1251 | /* check for alternative ifindex for this bcm_op */ |
1252 | ||
1253 | if (!ifindex && msg->msg_name) { | |
1254 | /* no bound device as default => check msg_name */ | |
342dfc30 | 1255 | DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); |
ffd980f9 | 1256 | |
5e507328 KVD |
1257 | if (msg->msg_namelen < sizeof(*addr)) |
1258 | return -EINVAL; | |
1259 | ||
ffd980f9 OH |
1260 | if (addr->can_family != AF_CAN) |
1261 | return -EINVAL; | |
1262 | ||
1263 | /* ifindex from sendto() */ | |
1264 | ifindex = addr->can_ifindex; | |
1265 | ||
1266 | if (ifindex) { | |
1267 | struct net_device *dev; | |
1268 | ||
1269 | dev = dev_get_by_index(&init_net, ifindex); | |
1270 | if (!dev) | |
1271 | return -ENODEV; | |
1272 | ||
1273 | if (dev->type != ARPHRD_CAN) { | |
1274 | dev_put(dev); | |
1275 | return -ENODEV; | |
1276 | } | |
1277 | ||
1278 | dev_put(dev); | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | /* read message head information */ | |
1283 | ||
6ce8e9ce | 1284 | ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ); |
ffd980f9 OH |
1285 | if (ret < 0) |
1286 | return ret; | |
1287 | ||
1288 | lock_sock(sk); | |
1289 | ||
1290 | switch (msg_head.opcode) { | |
1291 | ||
1292 | case TX_SETUP: | |
1293 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); | |
1294 | break; | |
1295 | ||
1296 | case RX_SETUP: | |
1297 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); | |
1298 | break; | |
1299 | ||
1300 | case TX_DELETE: | |
1301 | if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex)) | |
1302 | ret = MHSIZ; | |
1303 | else | |
1304 | ret = -EINVAL; | |
1305 | break; | |
1306 | ||
1307 | case RX_DELETE: | |
1308 | if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex)) | |
1309 | ret = MHSIZ; | |
1310 | else | |
1311 | ret = -EINVAL; | |
1312 | break; | |
1313 | ||
1314 | case TX_READ: | |
1315 | /* reuse msg_head for the reply to TX_READ */ | |
1316 | msg_head.opcode = TX_STATUS; | |
1317 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); | |
1318 | break; | |
1319 | ||
1320 | case RX_READ: | |
1321 | /* reuse msg_head for the reply to RX_READ */ | |
1322 | msg_head.opcode = RX_STATUS; | |
1323 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); | |
1324 | break; | |
1325 | ||
1326 | case TX_SEND: | |
7f2d38eb OH |
1327 | /* we need exactly one can_frame behind the msg head */ |
1328 | if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ)) | |
ffd980f9 OH |
1329 | ret = -EINVAL; |
1330 | else | |
1331 | ret = bcm_tx_send(msg, ifindex, sk); | |
1332 | break; | |
1333 | ||
1334 | default: | |
1335 | ret = -EINVAL; | |
1336 | break; | |
1337 | } | |
1338 | ||
1339 | release_sock(sk); | |
1340 | ||
1341 | return ret; | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | * notification handler for netdevice status changes | |
1346 | */ | |
1347 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, | |
351638e7 | 1348 | void *ptr) |
ffd980f9 | 1349 | { |
351638e7 | 1350 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
ffd980f9 OH |
1351 | struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); |
1352 | struct sock *sk = &bo->sk; | |
1353 | struct bcm_op *op; | |
1354 | int notify_enodev = 0; | |
1355 | ||
721499e8 | 1356 | if (!net_eq(dev_net(dev), &init_net)) |
ffd980f9 OH |
1357 | return NOTIFY_DONE; |
1358 | ||
1359 | if (dev->type != ARPHRD_CAN) | |
1360 | return NOTIFY_DONE; | |
1361 | ||
1362 | switch (msg) { | |
1363 | ||
1364 | case NETDEV_UNREGISTER: | |
1365 | lock_sock(sk); | |
1366 | ||
1367 | /* remove device specific receive entries */ | |
1368 | list_for_each_entry(op, &bo->rx_ops, list) | |
1369 | if (op->rx_reg_dev == dev) | |
1370 | bcm_rx_unreg(dev, op); | |
1371 | ||
1372 | /* remove device reference, if this is our bound device */ | |
1373 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1374 | bo->bound = 0; | |
1375 | bo->ifindex = 0; | |
1376 | notify_enodev = 1; | |
1377 | } | |
1378 | ||
1379 | release_sock(sk); | |
1380 | ||
1381 | if (notify_enodev) { | |
1382 | sk->sk_err = ENODEV; | |
1383 | if (!sock_flag(sk, SOCK_DEAD)) | |
1384 | sk->sk_error_report(sk); | |
1385 | } | |
1386 | break; | |
1387 | ||
1388 | case NETDEV_DOWN: | |
1389 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1390 | sk->sk_err = ENETDOWN; | |
1391 | if (!sock_flag(sk, SOCK_DEAD)) | |
1392 | sk->sk_error_report(sk); | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | return NOTIFY_DONE; | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * initial settings for all BCM sockets to be set at socket creation time | |
1401 | */ | |
1402 | static int bcm_init(struct sock *sk) | |
1403 | { | |
1404 | struct bcm_sock *bo = bcm_sk(sk); | |
1405 | ||
1406 | bo->bound = 0; | |
1407 | bo->ifindex = 0; | |
1408 | bo->dropped_usr_msgs = 0; | |
1409 | bo->bcm_proc_read = NULL; | |
1410 | ||
1411 | INIT_LIST_HEAD(&bo->tx_ops); | |
1412 | INIT_LIST_HEAD(&bo->rx_ops); | |
1413 | ||
1414 | /* set notifier */ | |
1415 | bo->notifier.notifier_call = bcm_notifier; | |
1416 | ||
1417 | register_netdevice_notifier(&bo->notifier); | |
1418 | ||
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | /* | |
1423 | * standard socket functions | |
1424 | */ | |
1425 | static int bcm_release(struct socket *sock) | |
1426 | { | |
1427 | struct sock *sk = sock->sk; | |
c6914a6f | 1428 | struct bcm_sock *bo; |
ffd980f9 OH |
1429 | struct bcm_op *op, *next; |
1430 | ||
c6914a6f DJ |
1431 | if (sk == NULL) |
1432 | return 0; | |
1433 | ||
1434 | bo = bcm_sk(sk); | |
1435 | ||
ffd980f9 OH |
1436 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
1437 | ||
1438 | unregister_netdevice_notifier(&bo->notifier); | |
1439 | ||
1440 | lock_sock(sk); | |
1441 | ||
1442 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) | |
1443 | bcm_remove_op(op); | |
1444 | ||
1445 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { | |
1446 | /* | |
1447 | * Don't care if we're bound or not (due to netdev problems) | |
1448 | * can_rx_unregister() is always a save thing to do here. | |
1449 | */ | |
1450 | if (op->ifindex) { | |
1451 | /* | |
1452 | * Only remove subscriptions that had not | |
1453 | * been removed due to NETDEV_UNREGISTER | |
1454 | * in bcm_notifier() | |
1455 | */ | |
1456 | if (op->rx_reg_dev) { | |
1457 | struct net_device *dev; | |
1458 | ||
1459 | dev = dev_get_by_index(&init_net, op->ifindex); | |
1460 | if (dev) { | |
1461 | bcm_rx_unreg(dev, op); | |
1462 | dev_put(dev); | |
1463 | } | |
1464 | } | |
1465 | } else | |
1466 | can_rx_unregister(NULL, op->can_id, | |
1467 | REGMASK(op->can_id), | |
1468 | bcm_rx_handler, op); | |
1469 | ||
1470 | bcm_remove_op(op); | |
1471 | } | |
1472 | ||
1473 | /* remove procfs entry */ | |
1474 | if (proc_dir && bo->bcm_proc_read) | |
1475 | remove_proc_entry(bo->procname, proc_dir); | |
1476 | ||
1477 | /* remove device reference */ | |
1478 | if (bo->bound) { | |
1479 | bo->bound = 0; | |
1480 | bo->ifindex = 0; | |
1481 | } | |
1482 | ||
f7e5cc0c LW |
1483 | sock_orphan(sk); |
1484 | sock->sk = NULL; | |
1485 | ||
ffd980f9 OH |
1486 | release_sock(sk); |
1487 | sock_put(sk); | |
1488 | ||
1489 | return 0; | |
1490 | } | |
1491 | ||
1492 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, | |
1493 | int flags) | |
1494 | { | |
1495 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1496 | struct sock *sk = sock->sk; | |
1497 | struct bcm_sock *bo = bcm_sk(sk); | |
1498 | ||
6503d961 CG |
1499 | if (len < sizeof(*addr)) |
1500 | return -EINVAL; | |
1501 | ||
ffd980f9 OH |
1502 | if (bo->bound) |
1503 | return -EISCONN; | |
1504 | ||
1505 | /* bind a device to this socket */ | |
1506 | if (addr->can_ifindex) { | |
1507 | struct net_device *dev; | |
1508 | ||
1509 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
1510 | if (!dev) | |
1511 | return -ENODEV; | |
1512 | ||
1513 | if (dev->type != ARPHRD_CAN) { | |
1514 | dev_put(dev); | |
1515 | return -ENODEV; | |
1516 | } | |
1517 | ||
1518 | bo->ifindex = dev->ifindex; | |
1519 | dev_put(dev); | |
1520 | ||
1521 | } else { | |
1522 | /* no interface reference for ifindex = 0 ('any' CAN device) */ | |
1523 | bo->ifindex = 0; | |
1524 | } | |
1525 | ||
1526 | bo->bound = 1; | |
1527 | ||
1528 | if (proc_dir) { | |
1529 | /* unique socket address as filename */ | |
9f260e0e | 1530 | sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
ea00b8e2 AD |
1531 | bo->bcm_proc_read = proc_create_data(bo->procname, 0644, |
1532 | proc_dir, | |
1533 | &bcm_proc_fops, sk); | |
ffd980f9 OH |
1534 | } |
1535 | ||
1536 | return 0; | |
1537 | } | |
1538 | ||
1b784140 YX |
1539 | static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1540 | int flags) | |
ffd980f9 OH |
1541 | { |
1542 | struct sock *sk = sock->sk; | |
1543 | struct sk_buff *skb; | |
1544 | int error = 0; | |
1545 | int noblock; | |
1546 | int err; | |
1547 | ||
1548 | noblock = flags & MSG_DONTWAIT; | |
1549 | flags &= ~MSG_DONTWAIT; | |
1550 | skb = skb_recv_datagram(sk, flags, noblock, &error); | |
1551 | if (!skb) | |
1552 | return error; | |
1553 | ||
1554 | if (skb->len < size) | |
1555 | size = skb->len; | |
1556 | ||
7eab8d9e | 1557 | err = memcpy_to_msg(msg, skb->data, size); |
ffd980f9 OH |
1558 | if (err < 0) { |
1559 | skb_free_datagram(sk, skb); | |
1560 | return err; | |
1561 | } | |
1562 | ||
3b885787 | 1563 | sock_recv_ts_and_drops(msg, sk, skb); |
ffd980f9 OH |
1564 | |
1565 | if (msg->msg_name) { | |
342dfc30 | 1566 | __sockaddr_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
1567 | msg->msg_namelen = sizeof(struct sockaddr_can); |
1568 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1569 | } | |
1570 | ||
1571 | skb_free_datagram(sk, skb); | |
1572 | ||
1573 | return size; | |
1574 | } | |
1575 | ||
53914b67 | 1576 | static const struct proto_ops bcm_ops = { |
ffd980f9 OH |
1577 | .family = PF_CAN, |
1578 | .release = bcm_release, | |
1579 | .bind = sock_no_bind, | |
1580 | .connect = bcm_connect, | |
1581 | .socketpair = sock_no_socketpair, | |
1582 | .accept = sock_no_accept, | |
1583 | .getname = sock_no_getname, | |
1584 | .poll = datagram_poll, | |
53914b67 | 1585 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
ffd980f9 OH |
1586 | .listen = sock_no_listen, |
1587 | .shutdown = sock_no_shutdown, | |
1588 | .setsockopt = sock_no_setsockopt, | |
1589 | .getsockopt = sock_no_getsockopt, | |
1590 | .sendmsg = bcm_sendmsg, | |
1591 | .recvmsg = bcm_recvmsg, | |
1592 | .mmap = sock_no_mmap, | |
1593 | .sendpage = sock_no_sendpage, | |
1594 | }; | |
1595 | ||
1596 | static struct proto bcm_proto __read_mostly = { | |
1597 | .name = "CAN_BCM", | |
1598 | .owner = THIS_MODULE, | |
1599 | .obj_size = sizeof(struct bcm_sock), | |
1600 | .init = bcm_init, | |
1601 | }; | |
1602 | ||
1650629d | 1603 | static const struct can_proto bcm_can_proto = { |
ffd980f9 OH |
1604 | .type = SOCK_DGRAM, |
1605 | .protocol = CAN_BCM, | |
ffd980f9 OH |
1606 | .ops = &bcm_ops, |
1607 | .prot = &bcm_proto, | |
1608 | }; | |
1609 | ||
1610 | static int __init bcm_module_init(void) | |
1611 | { | |
1612 | int err; | |
1613 | ||
b111b78c | 1614 | pr_info("can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"); |
ffd980f9 OH |
1615 | |
1616 | err = can_proto_register(&bcm_can_proto); | |
1617 | if (err < 0) { | |
1618 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); | |
1619 | return err; | |
1620 | } | |
1621 | ||
1622 | /* create /proc/net/can-bcm directory */ | |
1623 | proc_dir = proc_mkdir("can-bcm", init_net.proc_net); | |
ffd980f9 OH |
1624 | return 0; |
1625 | } | |
1626 | ||
1627 | static void __exit bcm_module_exit(void) | |
1628 | { | |
1629 | can_proto_unregister(&bcm_can_proto); | |
1630 | ||
1631 | if (proc_dir) | |
ece31ffd | 1632 | remove_proc_entry("can-bcm", init_net.proc_net); |
ffd980f9 OH |
1633 | } |
1634 | ||
1635 | module_init(bcm_module_init); | |
1636 | module_exit(bcm_module_exit); |