]>
Commit | Line | Data |
---|---|---|
ffd980f9 OH |
1 | /* |
2 | * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content | |
3 | * | |
6f3b911d | 4 | * Copyright (c) 2002-2016 Volkswagen Group Electronic Research |
ffd980f9 OH |
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 | ||
6f3b911d | 70 | /* use of last_frames[index].flags */ |
ffd980f9 OH |
71 | #define RX_RECV 0x40 /* received data for this element */ |
72 | #define RX_THR 0x80 /* element not been sent due to throttle feature */ | |
6f3b911d | 73 | #define BCM_CAN_FLAGS_MASK 0x3F /* to clean private flags after usage */ |
ffd980f9 OH |
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 | |
5499a6b2 | 80 | #define CAN_BCM_VERSION "20161123" |
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 | 86 | |
6f3b911d OH |
87 | /* |
88 | * easy access to the first 64 bit of can(fd)_frame payload. cp->data is | |
89 | * 64 bit aligned so the offset has to be multiples of 8 which is ensured | |
90 | * by the only callers in bcm_rx_cmp_to_index() bcm_rx_handler(). | |
91 | */ | |
92 | static inline u64 get_u64(const struct canfd_frame *cp, int offset) | |
ffd980f9 | 93 | { |
6f3b911d | 94 | return *(u64 *)(cp->data + offset); |
ffd980f9 OH |
95 | } |
96 | ||
97 | struct bcm_op { | |
98 | struct list_head list; | |
99 | int ifindex; | |
100 | canid_t can_id; | |
5b75c497 | 101 | u32 flags; |
ffd980f9 | 102 | unsigned long frames_abs, frames_filtered; |
ba61a8d9 | 103 | struct bcm_timeval ival1, ival2; |
73e87e02 | 104 | struct hrtimer timer, thrtimer; |
6e5c172c | 105 | struct tasklet_struct tsklet, thrtsklet; |
73e87e02 | 106 | ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; |
ffd980f9 | 107 | int rx_ifindex; |
6f3b911d | 108 | int cfsiz; |
5b75c497 OH |
109 | u32 count; |
110 | u32 nframes; | |
111 | u32 currframe; | |
5499a6b2 OH |
112 | /* void pointers to arrays of struct can[fd]_frame */ |
113 | void *frames; | |
114 | void *last_frames; | |
6f3b911d OH |
115 | struct canfd_frame sframe; |
116 | struct canfd_frame last_sframe; | |
ffd980f9 OH |
117 | struct sock *sk; |
118 | struct net_device *rx_reg_dev; | |
119 | }; | |
120 | ||
121 | static struct proc_dir_entry *proc_dir; | |
122 | ||
123 | struct bcm_sock { | |
124 | struct sock sk; | |
125 | int bound; | |
126 | int ifindex; | |
127 | struct notifier_block notifier; | |
128 | struct list_head rx_ops; | |
129 | struct list_head tx_ops; | |
130 | unsigned long dropped_usr_msgs; | |
131 | struct proc_dir_entry *bcm_proc_read; | |
9f260e0e | 132 | char procname [32]; /* inode number in decimal with \0 */ |
ffd980f9 OH |
133 | }; |
134 | ||
135 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) | |
136 | { | |
137 | return (struct bcm_sock *)sk; | |
138 | } | |
139 | ||
ba61a8d9 AB |
140 | static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv) |
141 | { | |
142 | return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC); | |
143 | } | |
144 | ||
6f3b911d | 145 | #define CFSIZ(flags) ((flags & CAN_FD_FRAME) ? CANFD_MTU : CAN_MTU) |
ffd980f9 OH |
146 | #define OPSIZ sizeof(struct bcm_op) |
147 | #define MHSIZ sizeof(struct bcm_msg_head) | |
148 | ||
ffd980f9 OH |
149 | /* |
150 | * procfs functions | |
151 | */ | |
6755aeba | 152 | static char *bcm_proc_getifname(char *result, int ifindex) |
ffd980f9 OH |
153 | { |
154 | struct net_device *dev; | |
155 | ||
156 | if (!ifindex) | |
157 | return "any"; | |
158 | ||
ff879eb6 | 159 | rcu_read_lock(); |
160 | dev = dev_get_by_index_rcu(&init_net, ifindex); | |
ffd980f9 | 161 | if (dev) |
6755aeba ED |
162 | strcpy(result, dev->name); |
163 | else | |
164 | strcpy(result, "???"); | |
ff879eb6 | 165 | rcu_read_unlock(); |
ffd980f9 | 166 | |
6755aeba | 167 | return result; |
ffd980f9 OH |
168 | } |
169 | ||
ea00b8e2 | 170 | static int bcm_proc_show(struct seq_file *m, void *v) |
ffd980f9 | 171 | { |
6755aeba | 172 | char ifname[IFNAMSIZ]; |
ea00b8e2 | 173 | struct sock *sk = (struct sock *)m->private; |
ffd980f9 OH |
174 | struct bcm_sock *bo = bcm_sk(sk); |
175 | struct bcm_op *op; | |
176 | ||
71338aa7 DR |
177 | seq_printf(m, ">>> socket %pK", sk->sk_socket); |
178 | seq_printf(m, " / sk %pK", sk); | |
179 | seq_printf(m, " / bo %pK", bo); | |
ea00b8e2 | 180 | seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); |
6755aeba | 181 | seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); |
ea00b8e2 | 182 | seq_printf(m, " <<<\n"); |
ffd980f9 OH |
183 | |
184 | list_for_each_entry(op, &bo->rx_ops, list) { | |
185 | ||
186 | unsigned long reduction; | |
187 | ||
188 | /* print only active entries & prevent division by zero */ | |
189 | if (!op->frames_abs) | |
190 | continue; | |
191 | ||
6f3b911d OH |
192 | seq_printf(m, "rx_op: %03X %-5s ", op->can_id, |
193 | bcm_proc_getifname(ifname, op->ifindex)); | |
194 | ||
195 | if (op->flags & CAN_FD_FRAME) | |
196 | seq_printf(m, "(%u)", op->nframes); | |
197 | else | |
198 | seq_printf(m, "[%u]", op->nframes); | |
199 | ||
200 | seq_printf(m, "%c ", (op->flags & RX_CHECK_DLC) ? 'd' : ' '); | |
201 | ||
2456e855 | 202 | if (op->kt_ival1) |
ea00b8e2 | 203 | seq_printf(m, "timeo=%lld ", |
95acb490 | 204 | (long long)ktime_to_us(op->kt_ival1)); |
ffd980f9 | 205 | |
2456e855 | 206 | if (op->kt_ival2) |
ea00b8e2 | 207 | seq_printf(m, "thr=%lld ", |
95acb490 | 208 | (long long)ktime_to_us(op->kt_ival2)); |
ffd980f9 | 209 | |
ea00b8e2 | 210 | seq_printf(m, "# recv %ld (%ld) => reduction: ", |
95acb490 | 211 | op->frames_filtered, op->frames_abs); |
ffd980f9 OH |
212 | |
213 | reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; | |
214 | ||
ea00b8e2 | 215 | seq_printf(m, "%s%ld%%\n", |
95acb490 | 216 | (reduction == 100) ? "near " : "", reduction); |
ffd980f9 OH |
217 | } |
218 | ||
219 | list_for_each_entry(op, &bo->tx_ops, list) { | |
220 | ||
6f3b911d OH |
221 | seq_printf(m, "tx_op: %03X %s ", op->can_id, |
222 | bcm_proc_getifname(ifname, op->ifindex)); | |
223 | ||
224 | if (op->flags & CAN_FD_FRAME) | |
225 | seq_printf(m, "(%u) ", op->nframes); | |
226 | else | |
227 | seq_printf(m, "[%u] ", op->nframes); | |
ffd980f9 | 228 | |
2456e855 | 229 | if (op->kt_ival1) |
ea00b8e2 | 230 | seq_printf(m, "t1=%lld ", |
95acb490 | 231 | (long long)ktime_to_us(op->kt_ival1)); |
73e87e02 | 232 | |
2456e855 | 233 | if (op->kt_ival2) |
ea00b8e2 | 234 | seq_printf(m, "t2=%lld ", |
95acb490 | 235 | (long long)ktime_to_us(op->kt_ival2)); |
ffd980f9 | 236 | |
ea00b8e2 | 237 | seq_printf(m, "# sent %ld\n", op->frames_abs); |
ffd980f9 | 238 | } |
ea00b8e2 AD |
239 | seq_putc(m, '\n'); |
240 | return 0; | |
241 | } | |
ffd980f9 | 242 | |
ea00b8e2 AD |
243 | static int bcm_proc_open(struct inode *inode, struct file *file) |
244 | { | |
d9dda78b | 245 | return single_open(file, bcm_proc_show, PDE_DATA(inode)); |
ffd980f9 OH |
246 | } |
247 | ||
ea00b8e2 AD |
248 | static const struct file_operations bcm_proc_fops = { |
249 | .owner = THIS_MODULE, | |
250 | .open = bcm_proc_open, | |
251 | .read = seq_read, | |
252 | .llseek = seq_lseek, | |
253 | .release = single_release, | |
254 | }; | |
255 | ||
ffd980f9 OH |
256 | /* |
257 | * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface | |
258 | * of the given bcm tx op | |
259 | */ | |
260 | static void bcm_can_tx(struct bcm_op *op) | |
261 | { | |
262 | struct sk_buff *skb; | |
263 | struct net_device *dev; | |
6f3b911d | 264 | struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe; |
ffd980f9 OH |
265 | |
266 | /* no target device? => exit */ | |
267 | if (!op->ifindex) | |
268 | return; | |
269 | ||
270 | dev = dev_get_by_index(&init_net, op->ifindex); | |
271 | if (!dev) { | |
272 | /* RFC: should this bcm_op remove itself here? */ | |
273 | return; | |
274 | } | |
275 | ||
6f3b911d | 276 | skb = alloc_skb(op->cfsiz + sizeof(struct can_skb_priv), gfp_any()); |
ffd980f9 OH |
277 | if (!skb) |
278 | goto out; | |
279 | ||
2bf3440d OH |
280 | can_skb_reserve(skb); |
281 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 282 | can_skb_prv(skb)->skbcnt = 0; |
156c2bb9 | 283 | |
6f3b911d | 284 | memcpy(skb_put(skb, op->cfsiz), cf, op->cfsiz); |
ffd980f9 OH |
285 | |
286 | /* send with loopback */ | |
287 | skb->dev = dev; | |
0ae89beb | 288 | can_skb_set_owner(skb, op->sk); |
ffd980f9 OH |
289 | can_send(skb, 1); |
290 | ||
291 | /* update statistics */ | |
292 | op->currframe++; | |
293 | op->frames_abs++; | |
294 | ||
295 | /* reached last frame? */ | |
296 | if (op->currframe >= op->nframes) | |
297 | op->currframe = 0; | |
95acb490 | 298 | out: |
ffd980f9 OH |
299 | dev_put(dev); |
300 | } | |
301 | ||
302 | /* | |
303 | * bcm_send_to_user - send a BCM message to the userspace | |
304 | * (consisting of bcm_msg_head + x CAN frames) | |
305 | */ | |
306 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, | |
6f3b911d | 307 | struct canfd_frame *frames, int has_timestamp) |
ffd980f9 OH |
308 | { |
309 | struct sk_buff *skb; | |
6f3b911d | 310 | struct canfd_frame *firstframe; |
ffd980f9 OH |
311 | struct sockaddr_can *addr; |
312 | struct sock *sk = op->sk; | |
6f3b911d | 313 | unsigned int datalen = head->nframes * op->cfsiz; |
ffd980f9 OH |
314 | int err; |
315 | ||
316 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); | |
317 | if (!skb) | |
318 | return; | |
319 | ||
320 | memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); | |
321 | ||
322 | if (head->nframes) { | |
72c8a89a | 323 | /* CAN frames starting here */ |
6f3b911d | 324 | firstframe = (struct canfd_frame *)skb_tail_pointer(skb); |
ffd980f9 OH |
325 | |
326 | memcpy(skb_put(skb, datalen), frames, datalen); | |
327 | ||
328 | /* | |
6f3b911d | 329 | * the BCM uses the flags-element of the canfd_frame |
ffd980f9 OH |
330 | * structure for internal purposes. This is only |
331 | * relevant for updates that are generated by the | |
332 | * BCM, where nframes is 1 | |
333 | */ | |
334 | if (head->nframes == 1) | |
6f3b911d | 335 | firstframe->flags &= BCM_CAN_FLAGS_MASK; |
ffd980f9 OH |
336 | } |
337 | ||
338 | if (has_timestamp) { | |
339 | /* restore rx timestamp */ | |
340 | skb->tstamp = op->rx_stamp; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Put the datagram to the queue so that bcm_recvmsg() can | |
345 | * get it from there. We need to pass the interface index to | |
346 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
347 | * containing the interface index. | |
348 | */ | |
349 | ||
b4772ef8 | 350 | sock_skb_cb_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
351 | addr = (struct sockaddr_can *)skb->cb; |
352 | memset(addr, 0, sizeof(*addr)); | |
353 | addr->can_family = AF_CAN; | |
354 | addr->can_ifindex = op->rx_ifindex; | |
355 | ||
356 | err = sock_queue_rcv_skb(sk, skb); | |
357 | if (err < 0) { | |
358 | struct bcm_sock *bo = bcm_sk(sk); | |
359 | ||
360 | kfree_skb(skb); | |
361 | /* don't care about overflows in this statistic */ | |
362 | bo->dropped_usr_msgs++; | |
363 | } | |
364 | } | |
365 | ||
12d0d0d3 OH |
366 | static void bcm_tx_start_timer(struct bcm_op *op) |
367 | { | |
2456e855 | 368 | if (op->kt_ival1 && op->count) |
12d0d0d3 OH |
369 | hrtimer_start(&op->timer, |
370 | ktime_add(ktime_get(), op->kt_ival1), | |
371 | HRTIMER_MODE_ABS); | |
2456e855 | 372 | else if (op->kt_ival2) |
12d0d0d3 OH |
373 | hrtimer_start(&op->timer, |
374 | ktime_add(ktime_get(), op->kt_ival2), | |
375 | HRTIMER_MODE_ABS); | |
376 | } | |
377 | ||
6e5c172c OH |
378 | static void bcm_tx_timeout_tsklet(unsigned long data) |
379 | { | |
380 | struct bcm_op *op = (struct bcm_op *)data; | |
381 | struct bcm_msg_head msg_head; | |
382 | ||
2456e855 | 383 | if (op->kt_ival1 && (op->count > 0)) { |
ffd980f9 OH |
384 | |
385 | op->count--; | |
c53a6ee8 OH |
386 | if (!op->count && (op->flags & TX_COUNTEVT)) { |
387 | ||
388 | /* create notification to user */ | |
389 | msg_head.opcode = TX_EXPIRED; | |
390 | msg_head.flags = op->flags; | |
391 | msg_head.count = op->count; | |
392 | msg_head.ival1 = op->ival1; | |
393 | msg_head.ival2 = op->ival2; | |
394 | msg_head.can_id = op->can_id; | |
395 | msg_head.nframes = 0; | |
396 | ||
397 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
398 | } | |
ffd980f9 | 399 | bcm_can_tx(op); |
ffd980f9 | 400 | |
2456e855 | 401 | } else if (op->kt_ival2) |
12d0d0d3 | 402 | bcm_can_tx(op); |
ffd980f9 | 403 | |
12d0d0d3 | 404 | bcm_tx_start_timer(op); |
c53a6ee8 OH |
405 | } |
406 | ||
407 | /* | |
25985edc | 408 | * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions |
c53a6ee8 OH |
409 | */ |
410 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) | |
411 | { | |
412 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
413 | ||
414 | tasklet_schedule(&op->tsklet); | |
ffd980f9 | 415 | |
c53a6ee8 | 416 | return HRTIMER_NORESTART; |
ffd980f9 OH |
417 | } |
418 | ||
419 | /* | |
420 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content | |
421 | */ | |
6f3b911d | 422 | static void bcm_rx_changed(struct bcm_op *op, struct canfd_frame *data) |
ffd980f9 OH |
423 | { |
424 | struct bcm_msg_head head; | |
425 | ||
ffd980f9 OH |
426 | /* update statistics */ |
427 | op->frames_filtered++; | |
428 | ||
429 | /* prevent statistics overflow */ | |
430 | if (op->frames_filtered > ULONG_MAX/100) | |
431 | op->frames_filtered = op->frames_abs = 0; | |
432 | ||
6e5c172c | 433 | /* this element is not throttled anymore */ |
6f3b911d | 434 | data->flags &= (BCM_CAN_FLAGS_MASK|RX_RECV); |
6e5c172c | 435 | |
ffd980f9 OH |
436 | head.opcode = RX_CHANGED; |
437 | head.flags = op->flags; | |
438 | head.count = op->count; | |
439 | head.ival1 = op->ival1; | |
440 | head.ival2 = op->ival2; | |
441 | head.can_id = op->can_id; | |
442 | head.nframes = 1; | |
443 | ||
444 | bcm_send_to_user(op, &head, data, 1); | |
445 | } | |
446 | ||
447 | /* | |
448 | * bcm_rx_update_and_send - process a detected relevant receive content change | |
449 | * 1. update the last received data | |
450 | * 2. send a notification to the user (if possible) | |
451 | */ | |
452 | static void bcm_rx_update_and_send(struct bcm_op *op, | |
6f3b911d OH |
453 | struct canfd_frame *lastdata, |
454 | const struct canfd_frame *rxdata) | |
ffd980f9 | 455 | { |
6f3b911d | 456 | memcpy(lastdata, rxdata, op->cfsiz); |
ffd980f9 | 457 | |
6e5c172c | 458 | /* mark as used and throttled by default */ |
6f3b911d | 459 | lastdata->flags |= (RX_RECV|RX_THR); |
ffd980f9 | 460 | |
069f8457 | 461 | /* throttling mode inactive ? */ |
2456e855 | 462 | if (!op->kt_ival2) { |
73e87e02 | 463 | /* send RX_CHANGED to the user immediately */ |
6e5c172c | 464 | bcm_rx_changed(op, lastdata); |
73e87e02 OH |
465 | return; |
466 | } | |
ffd980f9 | 467 | |
6e5c172c OH |
468 | /* with active throttling timer we are just done here */ |
469 | if (hrtimer_active(&op->thrtimer)) | |
73e87e02 | 470 | return; |
ffd980f9 | 471 | |
069f8457 | 472 | /* first reception with enabled throttling mode */ |
2456e855 | 473 | if (!op->kt_lastmsg) |
6e5c172c | 474 | goto rx_changed_settime; |
73e87e02 | 475 | |
6e5c172c | 476 | /* got a second frame inside a potential throttle period? */ |
73e87e02 OH |
477 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
478 | ktime_to_us(op->kt_ival2)) { | |
6e5c172c | 479 | /* do not send the saved data - only start throttle timer */ |
73e87e02 OH |
480 | hrtimer_start(&op->thrtimer, |
481 | ktime_add(op->kt_lastmsg, op->kt_ival2), | |
482 | HRTIMER_MODE_ABS); | |
483 | return; | |
484 | } | |
485 | ||
486 | /* the gap was that big, that throttling was not needed here */ | |
6e5c172c OH |
487 | rx_changed_settime: |
488 | bcm_rx_changed(op, lastdata); | |
73e87e02 | 489 | op->kt_lastmsg = ktime_get(); |
ffd980f9 OH |
490 | } |
491 | ||
492 | /* | |
493 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly | |
494 | * received data stored in op->last_frames[] | |
495 | */ | |
5b75c497 | 496 | static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
6f3b911d | 497 | const struct canfd_frame *rxdata) |
ffd980f9 | 498 | { |
6f3b911d OH |
499 | struct canfd_frame *cf = op->frames + op->cfsiz * index; |
500 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; | |
501 | int i; | |
502 | ||
ffd980f9 | 503 | /* |
6f3b911d | 504 | * no one uses the MSBs of flags for comparison, |
ffd980f9 OH |
505 | * so we use it here to detect the first time of reception |
506 | */ | |
507 | ||
6f3b911d | 508 | if (!(lcf->flags & RX_RECV)) { |
ffd980f9 | 509 | /* received data for the first time => send update to user */ |
6f3b911d | 510 | bcm_rx_update_and_send(op, lcf, rxdata); |
ffd980f9 OH |
511 | return; |
512 | } | |
513 | ||
72c8a89a | 514 | /* do a real check in CAN frame data section */ |
6f3b911d OH |
515 | for (i = 0; i < rxdata->len; i += 8) { |
516 | if ((get_u64(cf, i) & get_u64(rxdata, i)) != | |
517 | (get_u64(cf, i) & get_u64(lcf, i))) { | |
518 | bcm_rx_update_and_send(op, lcf, rxdata); | |
519 | return; | |
520 | } | |
ffd980f9 OH |
521 | } |
522 | ||
523 | if (op->flags & RX_CHECK_DLC) { | |
6f3b911d OH |
524 | /* do a real check in CAN frame length */ |
525 | if (rxdata->len != lcf->len) { | |
526 | bcm_rx_update_and_send(op, lcf, rxdata); | |
ffd980f9 OH |
527 | return; |
528 | } | |
529 | } | |
530 | } | |
531 | ||
532 | /* | |
069f8457 | 533 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame reception |
ffd980f9 OH |
534 | */ |
535 | static void bcm_rx_starttimer(struct bcm_op *op) | |
536 | { | |
537 | if (op->flags & RX_NO_AUTOTIMER) | |
538 | return; | |
539 | ||
2456e855 | 540 | if (op->kt_ival1) |
73e87e02 | 541 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); |
ffd980f9 OH |
542 | } |
543 | ||
6e5c172c | 544 | static void bcm_rx_timeout_tsklet(unsigned long data) |
ffd980f9 | 545 | { |
6e5c172c | 546 | struct bcm_op *op = (struct bcm_op *)data; |
ffd980f9 OH |
547 | struct bcm_msg_head msg_head; |
548 | ||
6e5c172c | 549 | /* create notification to user */ |
ffd980f9 OH |
550 | msg_head.opcode = RX_TIMEOUT; |
551 | msg_head.flags = op->flags; | |
552 | msg_head.count = op->count; | |
553 | msg_head.ival1 = op->ival1; | |
554 | msg_head.ival2 = op->ival2; | |
555 | msg_head.can_id = op->can_id; | |
556 | msg_head.nframes = 0; | |
557 | ||
558 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
6e5c172c OH |
559 | } |
560 | ||
561 | /* | |
069f8457 | 562 | * bcm_rx_timeout_handler - when the (cyclic) CAN frame reception timed out |
6e5c172c OH |
563 | */ |
564 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) | |
565 | { | |
566 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
567 | ||
568 | /* schedule before NET_RX_SOFTIRQ */ | |
569 | tasklet_hi_schedule(&op->tsklet); | |
ffd980f9 OH |
570 | |
571 | /* no restart of the timer is done here! */ | |
572 | ||
573 | /* if user wants to be informed, when cyclic CAN-Messages come back */ | |
574 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { | |
72c8a89a | 575 | /* clear received CAN frames to indicate 'nothing received' */ |
6f3b911d | 576 | memset(op->last_frames, 0, op->nframes * op->cfsiz); |
ffd980f9 | 577 | } |
73e87e02 OH |
578 | |
579 | return HRTIMER_NORESTART; | |
ffd980f9 OH |
580 | } |
581 | ||
6e5c172c OH |
582 | /* |
583 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush | |
584 | */ | |
5b75c497 OH |
585 | static inline int bcm_rx_do_flush(struct bcm_op *op, int update, |
586 | unsigned int index) | |
6e5c172c | 587 | { |
6f3b911d OH |
588 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; |
589 | ||
590 | if ((op->last_frames) && (lcf->flags & RX_THR)) { | |
6e5c172c | 591 | if (update) |
6f3b911d | 592 | bcm_rx_changed(op, lcf); |
6e5c172c OH |
593 | return 1; |
594 | } | |
595 | return 0; | |
596 | } | |
597 | ||
ffd980f9 | 598 | /* |
73e87e02 | 599 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
6e5c172c OH |
600 | * |
601 | * update == 0 : just check if throttled data is available (any irq context) | |
602 | * update == 1 : check and send throttled data to userspace (soft_irq context) | |
ffd980f9 | 603 | */ |
6e5c172c | 604 | static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
ffd980f9 | 605 | { |
73e87e02 | 606 | int updated = 0; |
ffd980f9 OH |
607 | |
608 | if (op->nframes > 1) { | |
5b75c497 | 609 | unsigned int i; |
73e87e02 | 610 | |
ffd980f9 | 611 | /* for MUX filter we start at index 1 */ |
6e5c172c OH |
612 | for (i = 1; i < op->nframes; i++) |
613 | updated += bcm_rx_do_flush(op, update, i); | |
ffd980f9 OH |
614 | |
615 | } else { | |
616 | /* for RX_FILTER_ID and simple filter */ | |
6e5c172c | 617 | updated += bcm_rx_do_flush(op, update, 0); |
ffd980f9 | 618 | } |
73e87e02 OH |
619 | |
620 | return updated; | |
621 | } | |
622 | ||
6e5c172c OH |
623 | static void bcm_rx_thr_tsklet(unsigned long data) |
624 | { | |
625 | struct bcm_op *op = (struct bcm_op *)data; | |
626 | ||
627 | /* push the changed data to the userspace */ | |
628 | bcm_rx_thr_flush(op, 1); | |
629 | } | |
630 | ||
73e87e02 OH |
631 | /* |
632 | * bcm_rx_thr_handler - the time for blocked content updates is over now: | |
633 | * Check for throttled data and send it to the userspace | |
634 | */ | |
635 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) | |
636 | { | |
637 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); | |
638 | ||
6e5c172c OH |
639 | tasklet_schedule(&op->thrtsklet); |
640 | ||
641 | if (bcm_rx_thr_flush(op, 0)) { | |
73e87e02 OH |
642 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
643 | return HRTIMER_RESTART; | |
644 | } else { | |
645 | /* rearm throttle handling */ | |
8b0e1953 | 646 | op->kt_lastmsg = 0; |
73e87e02 OH |
647 | return HRTIMER_NORESTART; |
648 | } | |
ffd980f9 OH |
649 | } |
650 | ||
651 | /* | |
069f8457 | 652 | * bcm_rx_handler - handle a CAN frame reception |
ffd980f9 OH |
653 | */ |
654 | static void bcm_rx_handler(struct sk_buff *skb, void *data) | |
655 | { | |
656 | struct bcm_op *op = (struct bcm_op *)data; | |
6f3b911d | 657 | const struct canfd_frame *rxframe = (struct canfd_frame *)skb->data; |
5b75c497 | 658 | unsigned int i; |
ffd980f9 | 659 | |
6e5c172c | 660 | if (op->can_id != rxframe->can_id) |
1fa17d4b | 661 | return; |
ffd980f9 | 662 | |
6f3b911d OH |
663 | /* make sure to handle the correct frame type (CAN / CAN FD) */ |
664 | if (skb->len != op->cfsiz) | |
665 | return; | |
666 | ||
667 | /* disable timeout */ | |
668 | hrtimer_cancel(&op->timer); | |
669 | ||
6e5c172c OH |
670 | /* save rx timestamp */ |
671 | op->rx_stamp = skb->tstamp; | |
672 | /* save originator for recvfrom() */ | |
673 | op->rx_ifindex = skb->dev->ifindex; | |
674 | /* update statistics */ | |
675 | op->frames_abs++; | |
ffd980f9 OH |
676 | |
677 | if (op->flags & RX_RTR_FRAME) { | |
678 | /* send reply for RTR-request (placed in op->frames[0]) */ | |
679 | bcm_can_tx(op); | |
1fa17d4b | 680 | return; |
ffd980f9 OH |
681 | } |
682 | ||
683 | if (op->flags & RX_FILTER_ID) { | |
684 | /* the easiest case */ | |
5499a6b2 | 685 | bcm_rx_update_and_send(op, op->last_frames, rxframe); |
1fa17d4b | 686 | goto rx_starttimer; |
ffd980f9 OH |
687 | } |
688 | ||
689 | if (op->nframes == 1) { | |
690 | /* simple compare with index 0 */ | |
6e5c172c | 691 | bcm_rx_cmp_to_index(op, 0, rxframe); |
1fa17d4b | 692 | goto rx_starttimer; |
ffd980f9 OH |
693 | } |
694 | ||
695 | if (op->nframes > 1) { | |
696 | /* | |
697 | * multiplex compare | |
698 | * | |
699 | * find the first multiplex mask that fits. | |
6f3b911d OH |
700 | * Remark: The MUX-mask is stored in index 0 - but only the |
701 | * first 64 bits of the frame data[] are relevant (CAN FD) | |
ffd980f9 OH |
702 | */ |
703 | ||
704 | for (i = 1; i < op->nframes; i++) { | |
6f3b911d OH |
705 | if ((get_u64(op->frames, 0) & get_u64(rxframe, 0)) == |
706 | (get_u64(op->frames, 0) & | |
707 | get_u64(op->frames + op->cfsiz * i, 0))) { | |
6e5c172c | 708 | bcm_rx_cmp_to_index(op, i, rxframe); |
ffd980f9 OH |
709 | break; |
710 | } | |
711 | } | |
ffd980f9 | 712 | } |
6e5c172c | 713 | |
1fa17d4b | 714 | rx_starttimer: |
6e5c172c | 715 | bcm_rx_starttimer(op); |
ffd980f9 OH |
716 | } |
717 | ||
718 | /* | |
719 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements | |
720 | */ | |
2b5f5f5d OH |
721 | static struct bcm_op *bcm_find_op(struct list_head *ops, |
722 | struct bcm_msg_head *mh, int ifindex) | |
ffd980f9 OH |
723 | { |
724 | struct bcm_op *op; | |
725 | ||
726 | list_for_each_entry(op, ops, list) { | |
6f3b911d OH |
727 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
728 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) | |
ffd980f9 OH |
729 | return op; |
730 | } | |
731 | ||
732 | return NULL; | |
733 | } | |
734 | ||
735 | static void bcm_remove_op(struct bcm_op *op) | |
736 | { | |
73e87e02 OH |
737 | hrtimer_cancel(&op->timer); |
738 | hrtimer_cancel(&op->thrtimer); | |
ffd980f9 | 739 | |
6e5c172c OH |
740 | if (op->tsklet.func) |
741 | tasklet_kill(&op->tsklet); | |
742 | ||
743 | if (op->thrtsklet.func) | |
744 | tasklet_kill(&op->thrtsklet); | |
745 | ||
ffd980f9 OH |
746 | if ((op->frames) && (op->frames != &op->sframe)) |
747 | kfree(op->frames); | |
748 | ||
749 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) | |
750 | kfree(op->last_frames); | |
751 | ||
752 | kfree(op); | |
ffd980f9 OH |
753 | } |
754 | ||
755 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) | |
756 | { | |
757 | if (op->rx_reg_dev == dev) { | |
758 | can_rx_unregister(dev, op->can_id, REGMASK(op->can_id), | |
759 | bcm_rx_handler, op); | |
760 | ||
761 | /* mark as removed subscription */ | |
762 | op->rx_reg_dev = NULL; | |
763 | } else | |
764 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " | |
765 | "mismatch %p %p\n", op->rx_reg_dev, dev); | |
766 | } | |
767 | ||
768 | /* | |
769 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) | |
770 | */ | |
2b5f5f5d OH |
771 | static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh, |
772 | int ifindex) | |
ffd980f9 OH |
773 | { |
774 | struct bcm_op *op, *n; | |
775 | ||
776 | list_for_each_entry_safe(op, n, ops, list) { | |
6f3b911d OH |
777 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
778 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { | |
ffd980f9 OH |
779 | |
780 | /* | |
781 | * Don't care if we're bound or not (due to netdev | |
782 | * problems) can_rx_unregister() is always a save | |
783 | * thing to do here. | |
784 | */ | |
785 | if (op->ifindex) { | |
786 | /* | |
787 | * Only remove subscriptions that had not | |
788 | * been removed due to NETDEV_UNREGISTER | |
789 | * in bcm_notifier() | |
790 | */ | |
791 | if (op->rx_reg_dev) { | |
792 | struct net_device *dev; | |
793 | ||
794 | dev = dev_get_by_index(&init_net, | |
795 | op->ifindex); | |
796 | if (dev) { | |
797 | bcm_rx_unreg(dev, op); | |
798 | dev_put(dev); | |
799 | } | |
800 | } | |
801 | } else | |
802 | can_rx_unregister(NULL, op->can_id, | |
803 | REGMASK(op->can_id), | |
804 | bcm_rx_handler, op); | |
805 | ||
806 | list_del(&op->list); | |
807 | bcm_remove_op(op); | |
808 | return 1; /* done */ | |
809 | } | |
810 | } | |
811 | ||
812 | return 0; /* not found */ | |
813 | } | |
814 | ||
815 | /* | |
816 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) | |
817 | */ | |
2b5f5f5d OH |
818 | static int bcm_delete_tx_op(struct list_head *ops, struct bcm_msg_head *mh, |
819 | int ifindex) | |
ffd980f9 OH |
820 | { |
821 | struct bcm_op *op, *n; | |
822 | ||
823 | list_for_each_entry_safe(op, n, ops, list) { | |
6f3b911d OH |
824 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
825 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { | |
ffd980f9 OH |
826 | list_del(&op->list); |
827 | bcm_remove_op(op); | |
828 | return 1; /* done */ | |
829 | } | |
830 | } | |
831 | ||
832 | return 0; /* not found */ | |
833 | } | |
834 | ||
835 | /* | |
836 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) | |
837 | */ | |
838 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, | |
839 | int ifindex) | |
840 | { | |
2b5f5f5d | 841 | struct bcm_op *op = bcm_find_op(ops, msg_head, ifindex); |
ffd980f9 OH |
842 | |
843 | if (!op) | |
844 | return -EINVAL; | |
845 | ||
846 | /* put current values into msg_head */ | |
847 | msg_head->flags = op->flags; | |
848 | msg_head->count = op->count; | |
849 | msg_head->ival1 = op->ival1; | |
850 | msg_head->ival2 = op->ival2; | |
851 | msg_head->nframes = op->nframes; | |
852 | ||
853 | bcm_send_to_user(op, msg_head, op->frames, 0); | |
854 | ||
855 | return MHSIZ; | |
856 | } | |
857 | ||
858 | /* | |
859 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) | |
860 | */ | |
861 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
862 | int ifindex, struct sock *sk) | |
863 | { | |
864 | struct bcm_sock *bo = bcm_sk(sk); | |
865 | struct bcm_op *op; | |
6f3b911d | 866 | struct canfd_frame *cf; |
5b75c497 OH |
867 | unsigned int i; |
868 | int err; | |
ffd980f9 OH |
869 | |
870 | /* we need a real device to send frames */ | |
871 | if (!ifindex) | |
872 | return -ENODEV; | |
873 | ||
72c8a89a | 874 | /* check nframes boundaries - we need at least one CAN frame */ |
5b75c497 | 875 | if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) |
ffd980f9 OH |
876 | return -EINVAL; |
877 | ||
878 | /* check the given can_id */ | |
2b5f5f5d | 879 | op = bcm_find_op(&bo->tx_ops, msg_head, ifindex); |
ffd980f9 OH |
880 | if (op) { |
881 | /* update existing BCM operation */ | |
882 | ||
883 | /* | |
72c8a89a | 884 | * Do we need more space for the CAN frames than currently |
ffd980f9 OH |
885 | * allocated? -> This is a _really_ unusual use-case and |
886 | * therefore (complexity / locking) it is not supported. | |
887 | */ | |
888 | if (msg_head->nframes > op->nframes) | |
889 | return -E2BIG; | |
890 | ||
72c8a89a | 891 | /* update CAN frames content */ |
ffd980f9 | 892 | for (i = 0; i < msg_head->nframes; i++) { |
7f2d38eb | 893 | |
6f3b911d OH |
894 | cf = op->frames + op->cfsiz * i; |
895 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); | |
896 | ||
897 | if (op->flags & CAN_FD_FRAME) { | |
898 | if (cf->len > 64) | |
899 | err = -EINVAL; | |
900 | } else { | |
901 | if (cf->len > 8) | |
902 | err = -EINVAL; | |
903 | } | |
7f2d38eb | 904 | |
ffd980f9 OH |
905 | if (err < 0) |
906 | return err; | |
907 | ||
908 | if (msg_head->flags & TX_CP_CAN_ID) { | |
909 | /* copy can_id into frame */ | |
6f3b911d | 910 | cf->can_id = msg_head->can_id; |
ffd980f9 OH |
911 | } |
912 | } | |
6f3b911d | 913 | op->flags = msg_head->flags; |
ffd980f9 OH |
914 | |
915 | } else { | |
916 | /* insert new BCM operation for the given can_id */ | |
917 | ||
918 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
919 | if (!op) | |
920 | return -ENOMEM; | |
921 | ||
6f3b911d OH |
922 | op->can_id = msg_head->can_id; |
923 | op->cfsiz = CFSIZ(msg_head->flags); | |
924 | op->flags = msg_head->flags; | |
ffd980f9 | 925 | |
72c8a89a | 926 | /* create array for CAN frames and copy the data */ |
ffd980f9 | 927 | if (msg_head->nframes > 1) { |
6f3b911d | 928 | op->frames = kmalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
929 | GFP_KERNEL); |
930 | if (!op->frames) { | |
931 | kfree(op); | |
932 | return -ENOMEM; | |
933 | } | |
934 | } else | |
935 | op->frames = &op->sframe; | |
936 | ||
937 | for (i = 0; i < msg_head->nframes; i++) { | |
7f2d38eb | 938 | |
6f3b911d OH |
939 | cf = op->frames + op->cfsiz * i; |
940 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); | |
941 | ||
942 | if (op->flags & CAN_FD_FRAME) { | |
943 | if (cf->len > 64) | |
944 | err = -EINVAL; | |
945 | } else { | |
946 | if (cf->len > 8) | |
947 | err = -EINVAL; | |
948 | } | |
7f2d38eb | 949 | |
ffd980f9 OH |
950 | if (err < 0) { |
951 | if (op->frames != &op->sframe) | |
952 | kfree(op->frames); | |
953 | kfree(op); | |
954 | return err; | |
955 | } | |
956 | ||
957 | if (msg_head->flags & TX_CP_CAN_ID) { | |
958 | /* copy can_id into frame */ | |
6f3b911d | 959 | cf->can_id = msg_head->can_id; |
ffd980f9 OH |
960 | } |
961 | } | |
962 | ||
963 | /* tx_ops never compare with previous received messages */ | |
964 | op->last_frames = NULL; | |
965 | ||
966 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
967 | op->sk = sk; | |
968 | op->ifindex = ifindex; | |
969 | ||
970 | /* initialize uninitialized (kzalloc) structure */ | |
73e87e02 OH |
971 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
972 | op->timer.function = bcm_tx_timeout_handler; | |
ffd980f9 | 973 | |
6e5c172c OH |
974 | /* initialize tasklet for tx countevent notification */ |
975 | tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, | |
976 | (unsigned long) op); | |
977 | ||
ffd980f9 | 978 | /* currently unused in tx_ops */ |
73e87e02 | 979 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffd980f9 OH |
980 | |
981 | /* add this bcm_op to the list of the tx_ops */ | |
982 | list_add(&op->list, &bo->tx_ops); | |
983 | ||
984 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ | |
985 | ||
986 | if (op->nframes != msg_head->nframes) { | |
987 | op->nframes = msg_head->nframes; | |
988 | /* start multiple frame transmission with index 0 */ | |
989 | op->currframe = 0; | |
990 | } | |
991 | ||
992 | /* check flags */ | |
993 | ||
ffd980f9 OH |
994 | if (op->flags & TX_RESET_MULTI_IDX) { |
995 | /* start multiple frame transmission with index 0 */ | |
996 | op->currframe = 0; | |
997 | } | |
998 | ||
999 | if (op->flags & SETTIMER) { | |
1000 | /* set timer values */ | |
1001 | op->count = msg_head->count; | |
1002 | op->ival1 = msg_head->ival1; | |
1003 | op->ival2 = msg_head->ival2; | |
ba61a8d9 AB |
1004 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
1005 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1006 | |
1007 | /* disable an active timer due to zero values? */ | |
2456e855 | 1008 | if (!op->kt_ival1 && !op->kt_ival2) |
73e87e02 | 1009 | hrtimer_cancel(&op->timer); |
ffd980f9 OH |
1010 | } |
1011 | ||
12d0d0d3 OH |
1012 | if (op->flags & STARTTIMER) { |
1013 | hrtimer_cancel(&op->timer); | |
72c8a89a | 1014 | /* spec: send CAN frame when starting timer */ |
ffd980f9 | 1015 | op->flags |= TX_ANNOUNCE; |
ffd980f9 OH |
1016 | } |
1017 | ||
aabdcb0b | 1018 | if (op->flags & TX_ANNOUNCE) { |
ffd980f9 | 1019 | bcm_can_tx(op); |
12d0d0d3 | 1020 | if (op->count) |
aabdcb0b OH |
1021 | op->count--; |
1022 | } | |
ffd980f9 | 1023 | |
12d0d0d3 OH |
1024 | if (op->flags & STARTTIMER) |
1025 | bcm_tx_start_timer(op); | |
1026 | ||
6f3b911d | 1027 | return msg_head->nframes * op->cfsiz + MHSIZ; |
ffd980f9 OH |
1028 | } |
1029 | ||
1030 | /* | |
1031 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) | |
1032 | */ | |
1033 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
1034 | int ifindex, struct sock *sk) | |
1035 | { | |
1036 | struct bcm_sock *bo = bcm_sk(sk); | |
1037 | struct bcm_op *op; | |
1038 | int do_rx_register; | |
1039 | int err = 0; | |
1040 | ||
1041 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { | |
1042 | /* be robust against wrong usage ... */ | |
1043 | msg_head->flags |= RX_FILTER_ID; | |
1044 | /* ignore trailing garbage */ | |
1045 | msg_head->nframes = 0; | |
1046 | } | |
1047 | ||
5b75c497 OH |
1048 | /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ |
1049 | if (msg_head->nframes > MAX_NFRAMES + 1) | |
1050 | return -EINVAL; | |
1051 | ||
ffd980f9 OH |
1052 | if ((msg_head->flags & RX_RTR_FRAME) && |
1053 | ((msg_head->nframes != 1) || | |
1054 | (!(msg_head->can_id & CAN_RTR_FLAG)))) | |
1055 | return -EINVAL; | |
1056 | ||
1057 | /* check the given can_id */ | |
2b5f5f5d | 1058 | op = bcm_find_op(&bo->rx_ops, msg_head, ifindex); |
ffd980f9 OH |
1059 | if (op) { |
1060 | /* update existing BCM operation */ | |
1061 | ||
1062 | /* | |
72c8a89a | 1063 | * Do we need more space for the CAN frames than currently |
ffd980f9 OH |
1064 | * allocated? -> This is a _really_ unusual use-case and |
1065 | * therefore (complexity / locking) it is not supported. | |
1066 | */ | |
1067 | if (msg_head->nframes > op->nframes) | |
1068 | return -E2BIG; | |
1069 | ||
1070 | if (msg_head->nframes) { | |
72c8a89a | 1071 | /* update CAN frames content */ |
5499a6b2 | 1072 | err = memcpy_from_msg(op->frames, msg, |
6f3b911d | 1073 | msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1074 | if (err < 0) |
1075 | return err; | |
1076 | ||
1077 | /* clear last_frames to indicate 'nothing received' */ | |
6f3b911d | 1078 | memset(op->last_frames, 0, msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1079 | } |
1080 | ||
1081 | op->nframes = msg_head->nframes; | |
6f3b911d | 1082 | op->flags = msg_head->flags; |
ffd980f9 OH |
1083 | |
1084 | /* Only an update -> do not call can_rx_register() */ | |
1085 | do_rx_register = 0; | |
1086 | ||
1087 | } else { | |
1088 | /* insert new BCM operation for the given can_id */ | |
1089 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
1090 | if (!op) | |
1091 | return -ENOMEM; | |
1092 | ||
6f3b911d OH |
1093 | op->can_id = msg_head->can_id; |
1094 | op->nframes = msg_head->nframes; | |
1095 | op->cfsiz = CFSIZ(msg_head->flags); | |
1096 | op->flags = msg_head->flags; | |
ffd980f9 OH |
1097 | |
1098 | if (msg_head->nframes > 1) { | |
72c8a89a | 1099 | /* create array for CAN frames and copy the data */ |
6f3b911d | 1100 | op->frames = kmalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
1101 | GFP_KERNEL); |
1102 | if (!op->frames) { | |
1103 | kfree(op); | |
1104 | return -ENOMEM; | |
1105 | } | |
1106 | ||
72c8a89a | 1107 | /* create and init array for received CAN frames */ |
6f3b911d | 1108 | op->last_frames = kzalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
1109 | GFP_KERNEL); |
1110 | if (!op->last_frames) { | |
1111 | kfree(op->frames); | |
1112 | kfree(op); | |
1113 | return -ENOMEM; | |
1114 | } | |
1115 | ||
1116 | } else { | |
1117 | op->frames = &op->sframe; | |
1118 | op->last_frames = &op->last_sframe; | |
1119 | } | |
1120 | ||
1121 | if (msg_head->nframes) { | |
5499a6b2 | 1122 | err = memcpy_from_msg(op->frames, msg, |
6f3b911d | 1123 | msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1124 | if (err < 0) { |
1125 | if (op->frames != &op->sframe) | |
1126 | kfree(op->frames); | |
1127 | if (op->last_frames != &op->last_sframe) | |
1128 | kfree(op->last_frames); | |
1129 | kfree(op); | |
1130 | return err; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
1135 | op->sk = sk; | |
1136 | op->ifindex = ifindex; | |
1137 | ||
81b40110 OH |
1138 | /* ifindex for timeout events w/o previous frame reception */ |
1139 | op->rx_ifindex = ifindex; | |
1140 | ||
ffd980f9 | 1141 | /* initialize uninitialized (kzalloc) structure */ |
73e87e02 OH |
1142 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1143 | op->timer.function = bcm_rx_timeout_handler; | |
ffd980f9 | 1144 | |
6e5c172c OH |
1145 | /* initialize tasklet for rx timeout notification */ |
1146 | tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, | |
1147 | (unsigned long) op); | |
1148 | ||
73e87e02 OH |
1149 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1150 | op->thrtimer.function = bcm_rx_thr_handler; | |
ffd980f9 | 1151 | |
6e5c172c OH |
1152 | /* initialize tasklet for rx throttle handling */ |
1153 | tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, | |
1154 | (unsigned long) op); | |
1155 | ||
ffd980f9 OH |
1156 | /* add this bcm_op to the list of the rx_ops */ |
1157 | list_add(&op->list, &bo->rx_ops); | |
1158 | ||
1159 | /* call can_rx_register() */ | |
1160 | do_rx_register = 1; | |
1161 | ||
1162 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ | |
1163 | ||
1164 | /* check flags */ | |
ffd980f9 OH |
1165 | |
1166 | if (op->flags & RX_RTR_FRAME) { | |
5499a6b2 | 1167 | struct canfd_frame *frame0 = op->frames; |
ffd980f9 OH |
1168 | |
1169 | /* no timers in RTR-mode */ | |
73e87e02 OH |
1170 | hrtimer_cancel(&op->thrtimer); |
1171 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1172 | |
1173 | /* | |
1174 | * funny feature in RX(!)_SETUP only for RTR-mode: | |
1175 | * copy can_id into frame BUT without RTR-flag to | |
1176 | * prevent a full-load-loopback-test ... ;-] | |
1177 | */ | |
1178 | if ((op->flags & TX_CP_CAN_ID) || | |
5499a6b2 OH |
1179 | (frame0->can_id == op->can_id)) |
1180 | frame0->can_id = op->can_id & ~CAN_RTR_FLAG; | |
ffd980f9 OH |
1181 | |
1182 | } else { | |
1183 | if (op->flags & SETTIMER) { | |
1184 | ||
1185 | /* set timer value */ | |
1186 | op->ival1 = msg_head->ival1; | |
1187 | op->ival2 = msg_head->ival2; | |
ba61a8d9 AB |
1188 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
1189 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1190 | |
1191 | /* disable an active timer due to zero value? */ | |
2456e855 | 1192 | if (!op->kt_ival1) |
73e87e02 | 1193 | hrtimer_cancel(&op->timer); |
ffd980f9 OH |
1194 | |
1195 | /* | |
73e87e02 OH |
1196 | * In any case cancel the throttle timer, flush |
1197 | * potentially blocked msgs and reset throttle handling | |
ffd980f9 | 1198 | */ |
8b0e1953 | 1199 | op->kt_lastmsg = 0; |
73e87e02 | 1200 | hrtimer_cancel(&op->thrtimer); |
6e5c172c | 1201 | bcm_rx_thr_flush(op, 1); |
ffd980f9 OH |
1202 | } |
1203 | ||
2456e855 | 1204 | if ((op->flags & STARTTIMER) && op->kt_ival1) |
73e87e02 OH |
1205 | hrtimer_start(&op->timer, op->kt_ival1, |
1206 | HRTIMER_MODE_REL); | |
ffd980f9 OH |
1207 | } |
1208 | ||
1209 | /* now we can register for can_ids, if we added a new bcm_op */ | |
1210 | if (do_rx_register) { | |
1211 | if (ifindex) { | |
1212 | struct net_device *dev; | |
1213 | ||
1214 | dev = dev_get_by_index(&init_net, ifindex); | |
1215 | if (dev) { | |
1216 | err = can_rx_register(dev, op->can_id, | |
1217 | REGMASK(op->can_id), | |
1218 | bcm_rx_handler, op, | |
1219 | "bcm"); | |
1220 | ||
1221 | op->rx_reg_dev = dev; | |
1222 | dev_put(dev); | |
1223 | } | |
1224 | ||
1225 | } else | |
1226 | err = can_rx_register(NULL, op->can_id, | |
1227 | REGMASK(op->can_id), | |
1228 | bcm_rx_handler, op, "bcm"); | |
1229 | if (err) { | |
1230 | /* this bcm rx op is broken -> remove it */ | |
1231 | list_del(&op->list); | |
1232 | bcm_remove_op(op); | |
1233 | return err; | |
1234 | } | |
1235 | } | |
1236 | ||
6f3b911d | 1237 | return msg_head->nframes * op->cfsiz + MHSIZ; |
ffd980f9 OH |
1238 | } |
1239 | ||
1240 | /* | |
1241 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) | |
1242 | */ | |
2b5f5f5d OH |
1243 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk, |
1244 | int cfsiz) | |
ffd980f9 OH |
1245 | { |
1246 | struct sk_buff *skb; | |
1247 | struct net_device *dev; | |
1248 | int err; | |
1249 | ||
1250 | /* we need a real device to send frames */ | |
1251 | if (!ifindex) | |
1252 | return -ENODEV; | |
1253 | ||
2b5f5f5d | 1254 | skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL); |
ffd980f9 OH |
1255 | if (!skb) |
1256 | return -ENOMEM; | |
1257 | ||
2bf3440d | 1258 | can_skb_reserve(skb); |
156c2bb9 | 1259 | |
2b5f5f5d | 1260 | err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz); |
ffd980f9 OH |
1261 | if (err < 0) { |
1262 | kfree_skb(skb); | |
1263 | return err; | |
1264 | } | |
1265 | ||
1266 | dev = dev_get_by_index(&init_net, ifindex); | |
1267 | if (!dev) { | |
1268 | kfree_skb(skb); | |
1269 | return -ENODEV; | |
1270 | } | |
1271 | ||
2bf3440d | 1272 | can_skb_prv(skb)->ifindex = dev->ifindex; |
d3b58c47 | 1273 | can_skb_prv(skb)->skbcnt = 0; |
ffd980f9 | 1274 | skb->dev = dev; |
0ae89beb | 1275 | can_skb_set_owner(skb, sk); |
7f2d38eb | 1276 | err = can_send(skb, 1); /* send with loopback */ |
ffd980f9 OH |
1277 | dev_put(dev); |
1278 | ||
7f2d38eb OH |
1279 | if (err) |
1280 | return err; | |
1281 | ||
2b5f5f5d | 1282 | return cfsiz + MHSIZ; |
ffd980f9 OH |
1283 | } |
1284 | ||
1285 | /* | |
1286 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace | |
1287 | */ | |
1b784140 | 1288 | static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
ffd980f9 OH |
1289 | { |
1290 | struct sock *sk = sock->sk; | |
1291 | struct bcm_sock *bo = bcm_sk(sk); | |
1292 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ | |
1293 | struct bcm_msg_head msg_head; | |
6f3b911d | 1294 | int cfsiz; |
ffd980f9 OH |
1295 | int ret; /* read bytes or error codes as return value */ |
1296 | ||
1297 | if (!bo->bound) | |
1298 | return -ENOTCONN; | |
1299 | ||
7f2d38eb | 1300 | /* check for valid message length from userspace */ |
2b5f5f5d OH |
1301 | if (size < MHSIZ) |
1302 | return -EINVAL; | |
1303 | ||
1304 | /* read message head information */ | |
1305 | ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ); | |
1306 | if (ret < 0) | |
1307 | return ret; | |
1308 | ||
6f3b911d OH |
1309 | cfsiz = CFSIZ(msg_head.flags); |
1310 | if ((size - MHSIZ) % cfsiz) | |
7f2d38eb OH |
1311 | return -EINVAL; |
1312 | ||
ffd980f9 OH |
1313 | /* check for alternative ifindex for this bcm_op */ |
1314 | ||
1315 | if (!ifindex && msg->msg_name) { | |
1316 | /* no bound device as default => check msg_name */ | |
342dfc30 | 1317 | DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); |
ffd980f9 | 1318 | |
5e507328 KVD |
1319 | if (msg->msg_namelen < sizeof(*addr)) |
1320 | return -EINVAL; | |
1321 | ||
ffd980f9 OH |
1322 | if (addr->can_family != AF_CAN) |
1323 | return -EINVAL; | |
1324 | ||
1325 | /* ifindex from sendto() */ | |
1326 | ifindex = addr->can_ifindex; | |
1327 | ||
1328 | if (ifindex) { | |
1329 | struct net_device *dev; | |
1330 | ||
1331 | dev = dev_get_by_index(&init_net, ifindex); | |
1332 | if (!dev) | |
1333 | return -ENODEV; | |
1334 | ||
1335 | if (dev->type != ARPHRD_CAN) { | |
1336 | dev_put(dev); | |
1337 | return -ENODEV; | |
1338 | } | |
1339 | ||
1340 | dev_put(dev); | |
1341 | } | |
1342 | } | |
1343 | ||
ffd980f9 OH |
1344 | lock_sock(sk); |
1345 | ||
1346 | switch (msg_head.opcode) { | |
1347 | ||
1348 | case TX_SETUP: | |
1349 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); | |
1350 | break; | |
1351 | ||
1352 | case RX_SETUP: | |
1353 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); | |
1354 | break; | |
1355 | ||
1356 | case TX_DELETE: | |
2b5f5f5d | 1357 | if (bcm_delete_tx_op(&bo->tx_ops, &msg_head, ifindex)) |
ffd980f9 OH |
1358 | ret = MHSIZ; |
1359 | else | |
1360 | ret = -EINVAL; | |
1361 | break; | |
1362 | ||
1363 | case RX_DELETE: | |
2b5f5f5d | 1364 | if (bcm_delete_rx_op(&bo->rx_ops, &msg_head, ifindex)) |
ffd980f9 OH |
1365 | ret = MHSIZ; |
1366 | else | |
1367 | ret = -EINVAL; | |
1368 | break; | |
1369 | ||
1370 | case TX_READ: | |
1371 | /* reuse msg_head for the reply to TX_READ */ | |
1372 | msg_head.opcode = TX_STATUS; | |
1373 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); | |
1374 | break; | |
1375 | ||
1376 | case RX_READ: | |
1377 | /* reuse msg_head for the reply to RX_READ */ | |
1378 | msg_head.opcode = RX_STATUS; | |
1379 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); | |
1380 | break; | |
1381 | ||
1382 | case TX_SEND: | |
72c8a89a | 1383 | /* we need exactly one CAN frame behind the msg head */ |
6f3b911d | 1384 | if ((msg_head.nframes != 1) || (size != cfsiz + MHSIZ)) |
ffd980f9 OH |
1385 | ret = -EINVAL; |
1386 | else | |
6f3b911d | 1387 | ret = bcm_tx_send(msg, ifindex, sk, cfsiz); |
ffd980f9 OH |
1388 | break; |
1389 | ||
1390 | default: | |
1391 | ret = -EINVAL; | |
1392 | break; | |
1393 | } | |
1394 | ||
1395 | release_sock(sk); | |
1396 | ||
1397 | return ret; | |
1398 | } | |
1399 | ||
1400 | /* | |
1401 | * notification handler for netdevice status changes | |
1402 | */ | |
1403 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, | |
351638e7 | 1404 | void *ptr) |
ffd980f9 | 1405 | { |
351638e7 | 1406 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
ffd980f9 OH |
1407 | struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); |
1408 | struct sock *sk = &bo->sk; | |
1409 | struct bcm_op *op; | |
1410 | int notify_enodev = 0; | |
1411 | ||
721499e8 | 1412 | if (!net_eq(dev_net(dev), &init_net)) |
ffd980f9 OH |
1413 | return NOTIFY_DONE; |
1414 | ||
1415 | if (dev->type != ARPHRD_CAN) | |
1416 | return NOTIFY_DONE; | |
1417 | ||
1418 | switch (msg) { | |
1419 | ||
1420 | case NETDEV_UNREGISTER: | |
1421 | lock_sock(sk); | |
1422 | ||
1423 | /* remove device specific receive entries */ | |
1424 | list_for_each_entry(op, &bo->rx_ops, list) | |
1425 | if (op->rx_reg_dev == dev) | |
1426 | bcm_rx_unreg(dev, op); | |
1427 | ||
1428 | /* remove device reference, if this is our bound device */ | |
1429 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1430 | bo->bound = 0; | |
1431 | bo->ifindex = 0; | |
1432 | notify_enodev = 1; | |
1433 | } | |
1434 | ||
1435 | release_sock(sk); | |
1436 | ||
1437 | if (notify_enodev) { | |
1438 | sk->sk_err = ENODEV; | |
1439 | if (!sock_flag(sk, SOCK_DEAD)) | |
1440 | sk->sk_error_report(sk); | |
1441 | } | |
1442 | break; | |
1443 | ||
1444 | case NETDEV_DOWN: | |
1445 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1446 | sk->sk_err = ENETDOWN; | |
1447 | if (!sock_flag(sk, SOCK_DEAD)) | |
1448 | sk->sk_error_report(sk); | |
1449 | } | |
1450 | } | |
1451 | ||
1452 | return NOTIFY_DONE; | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * initial settings for all BCM sockets to be set at socket creation time | |
1457 | */ | |
1458 | static int bcm_init(struct sock *sk) | |
1459 | { | |
1460 | struct bcm_sock *bo = bcm_sk(sk); | |
1461 | ||
1462 | bo->bound = 0; | |
1463 | bo->ifindex = 0; | |
1464 | bo->dropped_usr_msgs = 0; | |
1465 | bo->bcm_proc_read = NULL; | |
1466 | ||
1467 | INIT_LIST_HEAD(&bo->tx_ops); | |
1468 | INIT_LIST_HEAD(&bo->rx_ops); | |
1469 | ||
1470 | /* set notifier */ | |
1471 | bo->notifier.notifier_call = bcm_notifier; | |
1472 | ||
1473 | register_netdevice_notifier(&bo->notifier); | |
1474 | ||
1475 | return 0; | |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * standard socket functions | |
1480 | */ | |
1481 | static int bcm_release(struct socket *sock) | |
1482 | { | |
1483 | struct sock *sk = sock->sk; | |
c6914a6f | 1484 | struct bcm_sock *bo; |
ffd980f9 OH |
1485 | struct bcm_op *op, *next; |
1486 | ||
c6914a6f DJ |
1487 | if (sk == NULL) |
1488 | return 0; | |
1489 | ||
1490 | bo = bcm_sk(sk); | |
1491 | ||
ffd980f9 OH |
1492 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
1493 | ||
1494 | unregister_netdevice_notifier(&bo->notifier); | |
1495 | ||
1496 | lock_sock(sk); | |
1497 | ||
1498 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) | |
1499 | bcm_remove_op(op); | |
1500 | ||
1501 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { | |
1502 | /* | |
1503 | * Don't care if we're bound or not (due to netdev problems) | |
1504 | * can_rx_unregister() is always a save thing to do here. | |
1505 | */ | |
1506 | if (op->ifindex) { | |
1507 | /* | |
1508 | * Only remove subscriptions that had not | |
1509 | * been removed due to NETDEV_UNREGISTER | |
1510 | * in bcm_notifier() | |
1511 | */ | |
1512 | if (op->rx_reg_dev) { | |
1513 | struct net_device *dev; | |
1514 | ||
1515 | dev = dev_get_by_index(&init_net, op->ifindex); | |
1516 | if (dev) { | |
1517 | bcm_rx_unreg(dev, op); | |
1518 | dev_put(dev); | |
1519 | } | |
1520 | } | |
1521 | } else | |
1522 | can_rx_unregister(NULL, op->can_id, | |
1523 | REGMASK(op->can_id), | |
1524 | bcm_rx_handler, op); | |
1525 | ||
1526 | bcm_remove_op(op); | |
1527 | } | |
1528 | ||
1529 | /* remove procfs entry */ | |
1530 | if (proc_dir && bo->bcm_proc_read) | |
1531 | remove_proc_entry(bo->procname, proc_dir); | |
1532 | ||
1533 | /* remove device reference */ | |
1534 | if (bo->bound) { | |
1535 | bo->bound = 0; | |
1536 | bo->ifindex = 0; | |
1537 | } | |
1538 | ||
f7e5cc0c LW |
1539 | sock_orphan(sk); |
1540 | sock->sk = NULL; | |
1541 | ||
ffd980f9 OH |
1542 | release_sock(sk); |
1543 | sock_put(sk); | |
1544 | ||
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, | |
1549 | int flags) | |
1550 | { | |
1551 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1552 | struct sock *sk = sock->sk; | |
1553 | struct bcm_sock *bo = bcm_sk(sk); | |
deb507f9 | 1554 | int ret = 0; |
ffd980f9 | 1555 | |
6503d961 CG |
1556 | if (len < sizeof(*addr)) |
1557 | return -EINVAL; | |
1558 | ||
deb507f9 OH |
1559 | lock_sock(sk); |
1560 | ||
1561 | if (bo->bound) { | |
1562 | ret = -EISCONN; | |
1563 | goto fail; | |
1564 | } | |
ffd980f9 OH |
1565 | |
1566 | /* bind a device to this socket */ | |
1567 | if (addr->can_ifindex) { | |
1568 | struct net_device *dev; | |
1569 | ||
1570 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
deb507f9 OH |
1571 | if (!dev) { |
1572 | ret = -ENODEV; | |
1573 | goto fail; | |
1574 | } | |
ffd980f9 OH |
1575 | if (dev->type != ARPHRD_CAN) { |
1576 | dev_put(dev); | |
deb507f9 OH |
1577 | ret = -ENODEV; |
1578 | goto fail; | |
ffd980f9 OH |
1579 | } |
1580 | ||
1581 | bo->ifindex = dev->ifindex; | |
1582 | dev_put(dev); | |
1583 | ||
1584 | } else { | |
1585 | /* no interface reference for ifindex = 0 ('any' CAN device) */ | |
1586 | bo->ifindex = 0; | |
1587 | } | |
1588 | ||
ffd980f9 OH |
1589 | if (proc_dir) { |
1590 | /* unique socket address as filename */ | |
9f260e0e | 1591 | sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
ea00b8e2 AD |
1592 | bo->bcm_proc_read = proc_create_data(bo->procname, 0644, |
1593 | proc_dir, | |
1594 | &bcm_proc_fops, sk); | |
deb507f9 OH |
1595 | if (!bo->bcm_proc_read) { |
1596 | ret = -ENOMEM; | |
1597 | goto fail; | |
1598 | } | |
ffd980f9 OH |
1599 | } |
1600 | ||
deb507f9 OH |
1601 | bo->bound = 1; |
1602 | ||
1603 | fail: | |
1604 | release_sock(sk); | |
1605 | ||
1606 | return ret; | |
ffd980f9 OH |
1607 | } |
1608 | ||
1b784140 YX |
1609 | static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1610 | int flags) | |
ffd980f9 OH |
1611 | { |
1612 | struct sock *sk = sock->sk; | |
1613 | struct sk_buff *skb; | |
1614 | int error = 0; | |
1615 | int noblock; | |
1616 | int err; | |
1617 | ||
1618 | noblock = flags & MSG_DONTWAIT; | |
1619 | flags &= ~MSG_DONTWAIT; | |
1620 | skb = skb_recv_datagram(sk, flags, noblock, &error); | |
1621 | if (!skb) | |
1622 | return error; | |
1623 | ||
1624 | if (skb->len < size) | |
1625 | size = skb->len; | |
1626 | ||
7eab8d9e | 1627 | err = memcpy_to_msg(msg, skb->data, size); |
ffd980f9 OH |
1628 | if (err < 0) { |
1629 | skb_free_datagram(sk, skb); | |
1630 | return err; | |
1631 | } | |
1632 | ||
3b885787 | 1633 | sock_recv_ts_and_drops(msg, sk, skb); |
ffd980f9 OH |
1634 | |
1635 | if (msg->msg_name) { | |
342dfc30 | 1636 | __sockaddr_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
1637 | msg->msg_namelen = sizeof(struct sockaddr_can); |
1638 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1639 | } | |
1640 | ||
1641 | skb_free_datagram(sk, skb); | |
1642 | ||
1643 | return size; | |
1644 | } | |
1645 | ||
53914b67 | 1646 | static const struct proto_ops bcm_ops = { |
ffd980f9 OH |
1647 | .family = PF_CAN, |
1648 | .release = bcm_release, | |
1649 | .bind = sock_no_bind, | |
1650 | .connect = bcm_connect, | |
1651 | .socketpair = sock_no_socketpair, | |
1652 | .accept = sock_no_accept, | |
1653 | .getname = sock_no_getname, | |
1654 | .poll = datagram_poll, | |
53914b67 | 1655 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
ffd980f9 OH |
1656 | .listen = sock_no_listen, |
1657 | .shutdown = sock_no_shutdown, | |
1658 | .setsockopt = sock_no_setsockopt, | |
1659 | .getsockopt = sock_no_getsockopt, | |
1660 | .sendmsg = bcm_sendmsg, | |
1661 | .recvmsg = bcm_recvmsg, | |
1662 | .mmap = sock_no_mmap, | |
1663 | .sendpage = sock_no_sendpage, | |
1664 | }; | |
1665 | ||
1666 | static struct proto bcm_proto __read_mostly = { | |
1667 | .name = "CAN_BCM", | |
1668 | .owner = THIS_MODULE, | |
1669 | .obj_size = sizeof(struct bcm_sock), | |
1670 | .init = bcm_init, | |
1671 | }; | |
1672 | ||
1650629d | 1673 | static const struct can_proto bcm_can_proto = { |
ffd980f9 OH |
1674 | .type = SOCK_DGRAM, |
1675 | .protocol = CAN_BCM, | |
ffd980f9 OH |
1676 | .ops = &bcm_ops, |
1677 | .prot = &bcm_proto, | |
1678 | }; | |
1679 | ||
1680 | static int __init bcm_module_init(void) | |
1681 | { | |
1682 | int err; | |
1683 | ||
b111b78c | 1684 | pr_info("can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"); |
ffd980f9 OH |
1685 | |
1686 | err = can_proto_register(&bcm_can_proto); | |
1687 | if (err < 0) { | |
1688 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); | |
1689 | return err; | |
1690 | } | |
1691 | ||
1692 | /* create /proc/net/can-bcm directory */ | |
1693 | proc_dir = proc_mkdir("can-bcm", init_net.proc_net); | |
ffd980f9 OH |
1694 | return 0; |
1695 | } | |
1696 | ||
1697 | static void __exit bcm_module_exit(void) | |
1698 | { | |
1699 | can_proto_unregister(&bcm_can_proto); | |
1700 | ||
1701 | if (proc_dir) | |
ece31ffd | 1702 | remove_proc_entry("can-bcm", init_net.proc_net); |
ffd980f9 OH |
1703 | } |
1704 | ||
1705 | module_init(bcm_module_init); | |
1706 | module_exit(bcm_module_exit); |