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Commit | Line | Data |
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ffd980f9 OH |
1 | /* |
2 | * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content | |
3 | * | |
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 | |
6f3b911d | 80 | #define CAN_BCM_VERSION "20160617" |
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; | |
6f3b911d OH |
112 | struct canfd_frame *frames; |
113 | struct canfd_frame *last_frames; | |
114 | struct canfd_frame sframe; | |
115 | struct canfd_frame last_sframe; | |
ffd980f9 OH |
116 | struct sock *sk; |
117 | struct net_device *rx_reg_dev; | |
118 | }; | |
119 | ||
120 | static struct proc_dir_entry *proc_dir; | |
121 | ||
122 | struct bcm_sock { | |
123 | struct sock sk; | |
124 | int bound; | |
125 | int ifindex; | |
126 | struct notifier_block notifier; | |
127 | struct list_head rx_ops; | |
128 | struct list_head tx_ops; | |
129 | unsigned long dropped_usr_msgs; | |
130 | struct proc_dir_entry *bcm_proc_read; | |
9f260e0e | 131 | char procname [32]; /* inode number in decimal with \0 */ |
ffd980f9 OH |
132 | }; |
133 | ||
134 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) | |
135 | { | |
136 | return (struct bcm_sock *)sk; | |
137 | } | |
138 | ||
ba61a8d9 AB |
139 | static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv) |
140 | { | |
141 | return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC); | |
142 | } | |
143 | ||
6f3b911d | 144 | #define CFSIZ(flags) ((flags & CAN_FD_FRAME) ? CANFD_MTU : CAN_MTU) |
ffd980f9 OH |
145 | #define OPSIZ sizeof(struct bcm_op) |
146 | #define MHSIZ sizeof(struct bcm_msg_head) | |
147 | ||
ffd980f9 OH |
148 | /* |
149 | * procfs functions | |
150 | */ | |
6755aeba | 151 | static char *bcm_proc_getifname(char *result, int ifindex) |
ffd980f9 OH |
152 | { |
153 | struct net_device *dev; | |
154 | ||
155 | if (!ifindex) | |
156 | return "any"; | |
157 | ||
ff879eb6 | 158 | rcu_read_lock(); |
159 | dev = dev_get_by_index_rcu(&init_net, ifindex); | |
ffd980f9 | 160 | if (dev) |
6755aeba ED |
161 | strcpy(result, dev->name); |
162 | else | |
163 | strcpy(result, "???"); | |
ff879eb6 | 164 | rcu_read_unlock(); |
ffd980f9 | 165 | |
6755aeba | 166 | return result; |
ffd980f9 OH |
167 | } |
168 | ||
ea00b8e2 | 169 | static int bcm_proc_show(struct seq_file *m, void *v) |
ffd980f9 | 170 | { |
6755aeba | 171 | char ifname[IFNAMSIZ]; |
ea00b8e2 | 172 | struct sock *sk = (struct sock *)m->private; |
ffd980f9 OH |
173 | struct bcm_sock *bo = bcm_sk(sk); |
174 | struct bcm_op *op; | |
175 | ||
71338aa7 DR |
176 | seq_printf(m, ">>> socket %pK", sk->sk_socket); |
177 | seq_printf(m, " / sk %pK", sk); | |
178 | seq_printf(m, " / bo %pK", bo); | |
ea00b8e2 | 179 | seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); |
6755aeba | 180 | seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); |
ea00b8e2 | 181 | seq_printf(m, " <<<\n"); |
ffd980f9 OH |
182 | |
183 | list_for_each_entry(op, &bo->rx_ops, list) { | |
184 | ||
185 | unsigned long reduction; | |
186 | ||
187 | /* print only active entries & prevent division by zero */ | |
188 | if (!op->frames_abs) | |
189 | continue; | |
190 | ||
6f3b911d OH |
191 | seq_printf(m, "rx_op: %03X %-5s ", op->can_id, |
192 | bcm_proc_getifname(ifname, op->ifindex)); | |
193 | ||
194 | if (op->flags & CAN_FD_FRAME) | |
195 | seq_printf(m, "(%u)", op->nframes); | |
196 | else | |
197 | seq_printf(m, "[%u]", op->nframes); | |
198 | ||
199 | seq_printf(m, "%c ", (op->flags & RX_CHECK_DLC) ? 'd' : ' '); | |
200 | ||
73e87e02 | 201 | if (op->kt_ival1.tv64) |
ea00b8e2 | 202 | seq_printf(m, "timeo=%lld ", |
95acb490 | 203 | (long long)ktime_to_us(op->kt_ival1)); |
ffd980f9 | 204 | |
73e87e02 | 205 | if (op->kt_ival2.tv64) |
ea00b8e2 | 206 | seq_printf(m, "thr=%lld ", |
95acb490 | 207 | (long long)ktime_to_us(op->kt_ival2)); |
ffd980f9 | 208 | |
ea00b8e2 | 209 | seq_printf(m, "# recv %ld (%ld) => reduction: ", |
95acb490 | 210 | op->frames_filtered, op->frames_abs); |
ffd980f9 OH |
211 | |
212 | reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; | |
213 | ||
ea00b8e2 | 214 | seq_printf(m, "%s%ld%%\n", |
95acb490 | 215 | (reduction == 100) ? "near " : "", reduction); |
ffd980f9 OH |
216 | } |
217 | ||
218 | list_for_each_entry(op, &bo->tx_ops, list) { | |
219 | ||
6f3b911d OH |
220 | seq_printf(m, "tx_op: %03X %s ", op->can_id, |
221 | bcm_proc_getifname(ifname, op->ifindex)); | |
222 | ||
223 | if (op->flags & CAN_FD_FRAME) | |
224 | seq_printf(m, "(%u) ", op->nframes); | |
225 | else | |
226 | seq_printf(m, "[%u] ", op->nframes); | |
ffd980f9 | 227 | |
73e87e02 | 228 | if (op->kt_ival1.tv64) |
ea00b8e2 | 229 | seq_printf(m, "t1=%lld ", |
95acb490 | 230 | (long long)ktime_to_us(op->kt_ival1)); |
73e87e02 OH |
231 | |
232 | if (op->kt_ival2.tv64) | |
ea00b8e2 | 233 | seq_printf(m, "t2=%lld ", |
95acb490 | 234 | (long long)ktime_to_us(op->kt_ival2)); |
ffd980f9 | 235 | |
ea00b8e2 | 236 | seq_printf(m, "# sent %ld\n", op->frames_abs); |
ffd980f9 | 237 | } |
ea00b8e2 AD |
238 | seq_putc(m, '\n'); |
239 | return 0; | |
240 | } | |
ffd980f9 | 241 | |
ea00b8e2 AD |
242 | static int bcm_proc_open(struct inode *inode, struct file *file) |
243 | { | |
d9dda78b | 244 | return single_open(file, bcm_proc_show, PDE_DATA(inode)); |
ffd980f9 OH |
245 | } |
246 | ||
ea00b8e2 AD |
247 | static const struct file_operations bcm_proc_fops = { |
248 | .owner = THIS_MODULE, | |
249 | .open = bcm_proc_open, | |
250 | .read = seq_read, | |
251 | .llseek = seq_lseek, | |
252 | .release = single_release, | |
253 | }; | |
254 | ||
ffd980f9 OH |
255 | /* |
256 | * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface | |
257 | * of the given bcm tx op | |
258 | */ | |
259 | static void bcm_can_tx(struct bcm_op *op) | |
260 | { | |
261 | struct sk_buff *skb; | |
262 | struct net_device *dev; | |
6f3b911d | 263 | struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe; |
ffd980f9 OH |
264 | |
265 | /* no target device? => exit */ | |
266 | if (!op->ifindex) | |
267 | return; | |
268 | ||
269 | dev = dev_get_by_index(&init_net, op->ifindex); | |
270 | if (!dev) { | |
271 | /* RFC: should this bcm_op remove itself here? */ | |
272 | return; | |
273 | } | |
274 | ||
6f3b911d | 275 | skb = alloc_skb(op->cfsiz + sizeof(struct can_skb_priv), gfp_any()); |
ffd980f9 OH |
276 | if (!skb) |
277 | goto out; | |
278 | ||
2bf3440d OH |
279 | can_skb_reserve(skb); |
280 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 281 | can_skb_prv(skb)->skbcnt = 0; |
156c2bb9 | 282 | |
6f3b911d | 283 | memcpy(skb_put(skb, op->cfsiz), cf, op->cfsiz); |
ffd980f9 OH |
284 | |
285 | /* send with loopback */ | |
286 | skb->dev = dev; | |
0ae89beb | 287 | can_skb_set_owner(skb, op->sk); |
ffd980f9 OH |
288 | can_send(skb, 1); |
289 | ||
290 | /* update statistics */ | |
291 | op->currframe++; | |
292 | op->frames_abs++; | |
293 | ||
294 | /* reached last frame? */ | |
295 | if (op->currframe >= op->nframes) | |
296 | op->currframe = 0; | |
95acb490 | 297 | out: |
ffd980f9 OH |
298 | dev_put(dev); |
299 | } | |
300 | ||
301 | /* | |
302 | * bcm_send_to_user - send a BCM message to the userspace | |
303 | * (consisting of bcm_msg_head + x CAN frames) | |
304 | */ | |
305 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, | |
6f3b911d | 306 | struct canfd_frame *frames, int has_timestamp) |
ffd980f9 OH |
307 | { |
308 | struct sk_buff *skb; | |
6f3b911d | 309 | struct canfd_frame *firstframe; |
ffd980f9 OH |
310 | struct sockaddr_can *addr; |
311 | struct sock *sk = op->sk; | |
6f3b911d | 312 | unsigned int datalen = head->nframes * op->cfsiz; |
ffd980f9 OH |
313 | int err; |
314 | ||
315 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); | |
316 | if (!skb) | |
317 | return; | |
318 | ||
319 | memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); | |
320 | ||
321 | if (head->nframes) { | |
72c8a89a | 322 | /* CAN frames starting here */ |
6f3b911d | 323 | firstframe = (struct canfd_frame *)skb_tail_pointer(skb); |
ffd980f9 OH |
324 | |
325 | memcpy(skb_put(skb, datalen), frames, datalen); | |
326 | ||
327 | /* | |
6f3b911d | 328 | * the BCM uses the flags-element of the canfd_frame |
ffd980f9 OH |
329 | * structure for internal purposes. This is only |
330 | * relevant for updates that are generated by the | |
331 | * BCM, where nframes is 1 | |
332 | */ | |
333 | if (head->nframes == 1) | |
6f3b911d | 334 | firstframe->flags &= BCM_CAN_FLAGS_MASK; |
ffd980f9 OH |
335 | } |
336 | ||
337 | if (has_timestamp) { | |
338 | /* restore rx timestamp */ | |
339 | skb->tstamp = op->rx_stamp; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Put the datagram to the queue so that bcm_recvmsg() can | |
344 | * get it from there. We need to pass the interface index to | |
345 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
346 | * containing the interface index. | |
347 | */ | |
348 | ||
b4772ef8 | 349 | sock_skb_cb_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
350 | addr = (struct sockaddr_can *)skb->cb; |
351 | memset(addr, 0, sizeof(*addr)); | |
352 | addr->can_family = AF_CAN; | |
353 | addr->can_ifindex = op->rx_ifindex; | |
354 | ||
355 | err = sock_queue_rcv_skb(sk, skb); | |
356 | if (err < 0) { | |
357 | struct bcm_sock *bo = bcm_sk(sk); | |
358 | ||
359 | kfree_skb(skb); | |
360 | /* don't care about overflows in this statistic */ | |
361 | bo->dropped_usr_msgs++; | |
362 | } | |
363 | } | |
364 | ||
12d0d0d3 OH |
365 | static void bcm_tx_start_timer(struct bcm_op *op) |
366 | { | |
367 | if (op->kt_ival1.tv64 && op->count) | |
368 | hrtimer_start(&op->timer, | |
369 | ktime_add(ktime_get(), op->kt_ival1), | |
370 | HRTIMER_MODE_ABS); | |
371 | else if (op->kt_ival2.tv64) | |
372 | hrtimer_start(&op->timer, | |
373 | ktime_add(ktime_get(), op->kt_ival2), | |
374 | HRTIMER_MODE_ABS); | |
375 | } | |
376 | ||
6e5c172c OH |
377 | static void bcm_tx_timeout_tsklet(unsigned long data) |
378 | { | |
379 | struct bcm_op *op = (struct bcm_op *)data; | |
380 | struct bcm_msg_head msg_head; | |
381 | ||
73e87e02 | 382 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
ffd980f9 OH |
383 | |
384 | op->count--; | |
c53a6ee8 OH |
385 | if (!op->count && (op->flags & TX_COUNTEVT)) { |
386 | ||
387 | /* create notification to user */ | |
388 | msg_head.opcode = TX_EXPIRED; | |
389 | msg_head.flags = op->flags; | |
390 | msg_head.count = op->count; | |
391 | msg_head.ival1 = op->ival1; | |
392 | msg_head.ival2 = op->ival2; | |
393 | msg_head.can_id = op->can_id; | |
394 | msg_head.nframes = 0; | |
395 | ||
396 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
397 | } | |
ffd980f9 | 398 | bcm_can_tx(op); |
ffd980f9 | 399 | |
12d0d0d3 OH |
400 | } else if (op->kt_ival2.tv64) |
401 | bcm_can_tx(op); | |
ffd980f9 | 402 | |
12d0d0d3 | 403 | bcm_tx_start_timer(op); |
c53a6ee8 OH |
404 | } |
405 | ||
406 | /* | |
25985edc | 407 | * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions |
c53a6ee8 OH |
408 | */ |
409 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) | |
410 | { | |
411 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
412 | ||
413 | tasklet_schedule(&op->tsklet); | |
ffd980f9 | 414 | |
c53a6ee8 | 415 | return HRTIMER_NORESTART; |
ffd980f9 OH |
416 | } |
417 | ||
418 | /* | |
419 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content | |
420 | */ | |
6f3b911d | 421 | static void bcm_rx_changed(struct bcm_op *op, struct canfd_frame *data) |
ffd980f9 OH |
422 | { |
423 | struct bcm_msg_head head; | |
424 | ||
ffd980f9 OH |
425 | /* update statistics */ |
426 | op->frames_filtered++; | |
427 | ||
428 | /* prevent statistics overflow */ | |
429 | if (op->frames_filtered > ULONG_MAX/100) | |
430 | op->frames_filtered = op->frames_abs = 0; | |
431 | ||
6e5c172c | 432 | /* this element is not throttled anymore */ |
6f3b911d | 433 | data->flags &= (BCM_CAN_FLAGS_MASK|RX_RECV); |
6e5c172c | 434 | |
ffd980f9 OH |
435 | head.opcode = RX_CHANGED; |
436 | head.flags = op->flags; | |
437 | head.count = op->count; | |
438 | head.ival1 = op->ival1; | |
439 | head.ival2 = op->ival2; | |
440 | head.can_id = op->can_id; | |
441 | head.nframes = 1; | |
442 | ||
443 | bcm_send_to_user(op, &head, data, 1); | |
444 | } | |
445 | ||
446 | /* | |
447 | * bcm_rx_update_and_send - process a detected relevant receive content change | |
448 | * 1. update the last received data | |
449 | * 2. send a notification to the user (if possible) | |
450 | */ | |
451 | static void bcm_rx_update_and_send(struct bcm_op *op, | |
6f3b911d OH |
452 | struct canfd_frame *lastdata, |
453 | const struct canfd_frame *rxdata) | |
ffd980f9 | 454 | { |
6f3b911d | 455 | memcpy(lastdata, rxdata, op->cfsiz); |
ffd980f9 | 456 | |
6e5c172c | 457 | /* mark as used and throttled by default */ |
6f3b911d | 458 | lastdata->flags |= (RX_RECV|RX_THR); |
ffd980f9 | 459 | |
069f8457 | 460 | /* throttling mode inactive ? */ |
6e5c172c | 461 | if (!op->kt_ival2.tv64) { |
73e87e02 | 462 | /* send RX_CHANGED to the user immediately */ |
6e5c172c | 463 | bcm_rx_changed(op, lastdata); |
73e87e02 OH |
464 | return; |
465 | } | |
ffd980f9 | 466 | |
6e5c172c OH |
467 | /* with active throttling timer we are just done here */ |
468 | if (hrtimer_active(&op->thrtimer)) | |
73e87e02 | 469 | return; |
ffd980f9 | 470 | |
069f8457 | 471 | /* first reception with enabled throttling mode */ |
6e5c172c OH |
472 | if (!op->kt_lastmsg.tv64) |
473 | goto rx_changed_settime; | |
73e87e02 | 474 | |
6e5c172c | 475 | /* got a second frame inside a potential throttle period? */ |
73e87e02 OH |
476 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
477 | ktime_to_us(op->kt_ival2)) { | |
6e5c172c | 478 | /* do not send the saved data - only start throttle timer */ |
73e87e02 OH |
479 | hrtimer_start(&op->thrtimer, |
480 | ktime_add(op->kt_lastmsg, op->kt_ival2), | |
481 | HRTIMER_MODE_ABS); | |
482 | return; | |
483 | } | |
484 | ||
485 | /* the gap was that big, that throttling was not needed here */ | |
6e5c172c OH |
486 | rx_changed_settime: |
487 | bcm_rx_changed(op, lastdata); | |
73e87e02 | 488 | op->kt_lastmsg = ktime_get(); |
ffd980f9 OH |
489 | } |
490 | ||
491 | /* | |
492 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly | |
493 | * received data stored in op->last_frames[] | |
494 | */ | |
5b75c497 | 495 | static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
6f3b911d | 496 | const struct canfd_frame *rxdata) |
ffd980f9 | 497 | { |
6f3b911d OH |
498 | struct canfd_frame *cf = op->frames + op->cfsiz * index; |
499 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; | |
500 | int i; | |
501 | ||
ffd980f9 | 502 | /* |
6f3b911d | 503 | * no one uses the MSBs of flags for comparison, |
ffd980f9 OH |
504 | * so we use it here to detect the first time of reception |
505 | */ | |
506 | ||
6f3b911d | 507 | if (!(lcf->flags & RX_RECV)) { |
ffd980f9 | 508 | /* received data for the first time => send update to user */ |
6f3b911d | 509 | bcm_rx_update_and_send(op, lcf, rxdata); |
ffd980f9 OH |
510 | return; |
511 | } | |
512 | ||
72c8a89a | 513 | /* do a real check in CAN frame data section */ |
6f3b911d OH |
514 | for (i = 0; i < rxdata->len; i += 8) { |
515 | if ((get_u64(cf, i) & get_u64(rxdata, i)) != | |
516 | (get_u64(cf, i) & get_u64(lcf, i))) { | |
517 | bcm_rx_update_and_send(op, lcf, rxdata); | |
518 | return; | |
519 | } | |
ffd980f9 OH |
520 | } |
521 | ||
522 | if (op->flags & RX_CHECK_DLC) { | |
6f3b911d OH |
523 | /* do a real check in CAN frame length */ |
524 | if (rxdata->len != lcf->len) { | |
525 | bcm_rx_update_and_send(op, lcf, rxdata); | |
ffd980f9 OH |
526 | return; |
527 | } | |
528 | } | |
529 | } | |
530 | ||
531 | /* | |
069f8457 | 532 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame reception |
ffd980f9 OH |
533 | */ |
534 | static void bcm_rx_starttimer(struct bcm_op *op) | |
535 | { | |
536 | if (op->flags & RX_NO_AUTOTIMER) | |
537 | return; | |
538 | ||
73e87e02 OH |
539 | if (op->kt_ival1.tv64) |
540 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); | |
ffd980f9 OH |
541 | } |
542 | ||
6e5c172c | 543 | static void bcm_rx_timeout_tsklet(unsigned long data) |
ffd980f9 | 544 | { |
6e5c172c | 545 | struct bcm_op *op = (struct bcm_op *)data; |
ffd980f9 OH |
546 | struct bcm_msg_head msg_head; |
547 | ||
6e5c172c | 548 | /* create notification to user */ |
ffd980f9 OH |
549 | msg_head.opcode = RX_TIMEOUT; |
550 | msg_head.flags = op->flags; | |
551 | msg_head.count = op->count; | |
552 | msg_head.ival1 = op->ival1; | |
553 | msg_head.ival2 = op->ival2; | |
554 | msg_head.can_id = op->can_id; | |
555 | msg_head.nframes = 0; | |
556 | ||
557 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
6e5c172c OH |
558 | } |
559 | ||
560 | /* | |
069f8457 | 561 | * bcm_rx_timeout_handler - when the (cyclic) CAN frame reception timed out |
6e5c172c OH |
562 | */ |
563 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) | |
564 | { | |
565 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
566 | ||
567 | /* schedule before NET_RX_SOFTIRQ */ | |
568 | tasklet_hi_schedule(&op->tsklet); | |
ffd980f9 OH |
569 | |
570 | /* no restart of the timer is done here! */ | |
571 | ||
572 | /* if user wants to be informed, when cyclic CAN-Messages come back */ | |
573 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { | |
72c8a89a | 574 | /* clear received CAN frames to indicate 'nothing received' */ |
6f3b911d | 575 | memset(op->last_frames, 0, op->nframes * op->cfsiz); |
ffd980f9 | 576 | } |
73e87e02 OH |
577 | |
578 | return HRTIMER_NORESTART; | |
ffd980f9 OH |
579 | } |
580 | ||
6e5c172c OH |
581 | /* |
582 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush | |
583 | */ | |
5b75c497 OH |
584 | static inline int bcm_rx_do_flush(struct bcm_op *op, int update, |
585 | unsigned int index) | |
6e5c172c | 586 | { |
6f3b911d OH |
587 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; |
588 | ||
589 | if ((op->last_frames) && (lcf->flags & RX_THR)) { | |
6e5c172c | 590 | if (update) |
6f3b911d | 591 | bcm_rx_changed(op, lcf); |
6e5c172c OH |
592 | return 1; |
593 | } | |
594 | return 0; | |
595 | } | |
596 | ||
ffd980f9 | 597 | /* |
73e87e02 | 598 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
6e5c172c OH |
599 | * |
600 | * update == 0 : just check if throttled data is available (any irq context) | |
601 | * update == 1 : check and send throttled data to userspace (soft_irq context) | |
ffd980f9 | 602 | */ |
6e5c172c | 603 | static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
ffd980f9 | 604 | { |
73e87e02 | 605 | int updated = 0; |
ffd980f9 OH |
606 | |
607 | if (op->nframes > 1) { | |
5b75c497 | 608 | unsigned int i; |
73e87e02 | 609 | |
ffd980f9 | 610 | /* for MUX filter we start at index 1 */ |
6e5c172c OH |
611 | for (i = 1; i < op->nframes; i++) |
612 | updated += bcm_rx_do_flush(op, update, i); | |
ffd980f9 OH |
613 | |
614 | } else { | |
615 | /* for RX_FILTER_ID and simple filter */ | |
6e5c172c | 616 | updated += bcm_rx_do_flush(op, update, 0); |
ffd980f9 | 617 | } |
73e87e02 OH |
618 | |
619 | return updated; | |
620 | } | |
621 | ||
6e5c172c OH |
622 | static void bcm_rx_thr_tsklet(unsigned long data) |
623 | { | |
624 | struct bcm_op *op = (struct bcm_op *)data; | |
625 | ||
626 | /* push the changed data to the userspace */ | |
627 | bcm_rx_thr_flush(op, 1); | |
628 | } | |
629 | ||
73e87e02 OH |
630 | /* |
631 | * bcm_rx_thr_handler - the time for blocked content updates is over now: | |
632 | * Check for throttled data and send it to the userspace | |
633 | */ | |
634 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) | |
635 | { | |
636 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); | |
637 | ||
6e5c172c OH |
638 | tasklet_schedule(&op->thrtsklet); |
639 | ||
640 | if (bcm_rx_thr_flush(op, 0)) { | |
73e87e02 OH |
641 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
642 | return HRTIMER_RESTART; | |
643 | } else { | |
644 | /* rearm throttle handling */ | |
645 | op->kt_lastmsg = ktime_set(0, 0); | |
646 | return HRTIMER_NORESTART; | |
647 | } | |
ffd980f9 OH |
648 | } |
649 | ||
650 | /* | |
069f8457 | 651 | * bcm_rx_handler - handle a CAN frame reception |
ffd980f9 OH |
652 | */ |
653 | static void bcm_rx_handler(struct sk_buff *skb, void *data) | |
654 | { | |
655 | struct bcm_op *op = (struct bcm_op *)data; | |
6f3b911d | 656 | const struct canfd_frame *rxframe = (struct canfd_frame *)skb->data; |
5b75c497 | 657 | unsigned int i; |
ffd980f9 | 658 | |
6e5c172c | 659 | if (op->can_id != rxframe->can_id) |
1fa17d4b | 660 | return; |
ffd980f9 | 661 | |
6f3b911d OH |
662 | /* make sure to handle the correct frame type (CAN / CAN FD) */ |
663 | if (skb->len != op->cfsiz) | |
664 | return; | |
665 | ||
666 | /* disable timeout */ | |
667 | hrtimer_cancel(&op->timer); | |
668 | ||
6e5c172c OH |
669 | /* save rx timestamp */ |
670 | op->rx_stamp = skb->tstamp; | |
671 | /* save originator for recvfrom() */ | |
672 | op->rx_ifindex = skb->dev->ifindex; | |
673 | /* update statistics */ | |
674 | op->frames_abs++; | |
ffd980f9 OH |
675 | |
676 | if (op->flags & RX_RTR_FRAME) { | |
677 | /* send reply for RTR-request (placed in op->frames[0]) */ | |
678 | bcm_can_tx(op); | |
1fa17d4b | 679 | return; |
ffd980f9 OH |
680 | } |
681 | ||
682 | if (op->flags & RX_FILTER_ID) { | |
683 | /* the easiest case */ | |
6e5c172c | 684 | bcm_rx_update_and_send(op, &op->last_frames[0], rxframe); |
1fa17d4b | 685 | goto rx_starttimer; |
ffd980f9 OH |
686 | } |
687 | ||
688 | if (op->nframes == 1) { | |
689 | /* simple compare with index 0 */ | |
6e5c172c | 690 | bcm_rx_cmp_to_index(op, 0, rxframe); |
1fa17d4b | 691 | goto rx_starttimer; |
ffd980f9 OH |
692 | } |
693 | ||
694 | if (op->nframes > 1) { | |
695 | /* | |
696 | * multiplex compare | |
697 | * | |
698 | * find the first multiplex mask that fits. | |
6f3b911d OH |
699 | * Remark: The MUX-mask is stored in index 0 - but only the |
700 | * first 64 bits of the frame data[] are relevant (CAN FD) | |
ffd980f9 OH |
701 | */ |
702 | ||
703 | for (i = 1; i < op->nframes; i++) { | |
6f3b911d OH |
704 | if ((get_u64(op->frames, 0) & get_u64(rxframe, 0)) == |
705 | (get_u64(op->frames, 0) & | |
706 | get_u64(op->frames + op->cfsiz * i, 0))) { | |
6e5c172c | 707 | bcm_rx_cmp_to_index(op, i, rxframe); |
ffd980f9 OH |
708 | break; |
709 | } | |
710 | } | |
ffd980f9 | 711 | } |
6e5c172c | 712 | |
1fa17d4b | 713 | rx_starttimer: |
6e5c172c | 714 | bcm_rx_starttimer(op); |
ffd980f9 OH |
715 | } |
716 | ||
717 | /* | |
718 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements | |
719 | */ | |
2b5f5f5d OH |
720 | static struct bcm_op *bcm_find_op(struct list_head *ops, |
721 | struct bcm_msg_head *mh, int ifindex) | |
ffd980f9 OH |
722 | { |
723 | struct bcm_op *op; | |
724 | ||
725 | list_for_each_entry(op, ops, list) { | |
6f3b911d OH |
726 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
727 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) | |
ffd980f9 OH |
728 | return op; |
729 | } | |
730 | ||
731 | return NULL; | |
732 | } | |
733 | ||
734 | static void bcm_remove_op(struct bcm_op *op) | |
735 | { | |
73e87e02 OH |
736 | hrtimer_cancel(&op->timer); |
737 | hrtimer_cancel(&op->thrtimer); | |
ffd980f9 | 738 | |
6e5c172c OH |
739 | if (op->tsklet.func) |
740 | tasklet_kill(&op->tsklet); | |
741 | ||
742 | if (op->thrtsklet.func) | |
743 | tasklet_kill(&op->thrtsklet); | |
744 | ||
ffd980f9 OH |
745 | if ((op->frames) && (op->frames != &op->sframe)) |
746 | kfree(op->frames); | |
747 | ||
748 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) | |
749 | kfree(op->last_frames); | |
750 | ||
751 | kfree(op); | |
ffd980f9 OH |
752 | } |
753 | ||
754 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) | |
755 | { | |
756 | if (op->rx_reg_dev == dev) { | |
757 | can_rx_unregister(dev, op->can_id, REGMASK(op->can_id), | |
758 | bcm_rx_handler, op); | |
759 | ||
760 | /* mark as removed subscription */ | |
761 | op->rx_reg_dev = NULL; | |
762 | } else | |
763 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " | |
764 | "mismatch %p %p\n", op->rx_reg_dev, dev); | |
765 | } | |
766 | ||
767 | /* | |
768 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) | |
769 | */ | |
2b5f5f5d OH |
770 | static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh, |
771 | int ifindex) | |
ffd980f9 OH |
772 | { |
773 | struct bcm_op *op, *n; | |
774 | ||
775 | list_for_each_entry_safe(op, n, ops, list) { | |
6f3b911d OH |
776 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
777 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { | |
ffd980f9 OH |
778 | |
779 | /* | |
780 | * Don't care if we're bound or not (due to netdev | |
781 | * problems) can_rx_unregister() is always a save | |
782 | * thing to do here. | |
783 | */ | |
784 | if (op->ifindex) { | |
785 | /* | |
786 | * Only remove subscriptions that had not | |
787 | * been removed due to NETDEV_UNREGISTER | |
788 | * in bcm_notifier() | |
789 | */ | |
790 | if (op->rx_reg_dev) { | |
791 | struct net_device *dev; | |
792 | ||
793 | dev = dev_get_by_index(&init_net, | |
794 | op->ifindex); | |
795 | if (dev) { | |
796 | bcm_rx_unreg(dev, op); | |
797 | dev_put(dev); | |
798 | } | |
799 | } | |
800 | } else | |
801 | can_rx_unregister(NULL, op->can_id, | |
802 | REGMASK(op->can_id), | |
803 | bcm_rx_handler, op); | |
804 | ||
805 | list_del(&op->list); | |
806 | bcm_remove_op(op); | |
807 | return 1; /* done */ | |
808 | } | |
809 | } | |
810 | ||
811 | return 0; /* not found */ | |
812 | } | |
813 | ||
814 | /* | |
815 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) | |
816 | */ | |
2b5f5f5d OH |
817 | static int bcm_delete_tx_op(struct list_head *ops, struct bcm_msg_head *mh, |
818 | int ifindex) | |
ffd980f9 OH |
819 | { |
820 | struct bcm_op *op, *n; | |
821 | ||
822 | list_for_each_entry_safe(op, n, ops, list) { | |
6f3b911d OH |
823 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
824 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { | |
ffd980f9 OH |
825 | list_del(&op->list); |
826 | bcm_remove_op(op); | |
827 | return 1; /* done */ | |
828 | } | |
829 | } | |
830 | ||
831 | return 0; /* not found */ | |
832 | } | |
833 | ||
834 | /* | |
835 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) | |
836 | */ | |
837 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, | |
838 | int ifindex) | |
839 | { | |
2b5f5f5d | 840 | struct bcm_op *op = bcm_find_op(ops, msg_head, ifindex); |
ffd980f9 OH |
841 | |
842 | if (!op) | |
843 | return -EINVAL; | |
844 | ||
845 | /* put current values into msg_head */ | |
846 | msg_head->flags = op->flags; | |
847 | msg_head->count = op->count; | |
848 | msg_head->ival1 = op->ival1; | |
849 | msg_head->ival2 = op->ival2; | |
850 | msg_head->nframes = op->nframes; | |
851 | ||
852 | bcm_send_to_user(op, msg_head, op->frames, 0); | |
853 | ||
854 | return MHSIZ; | |
855 | } | |
856 | ||
857 | /* | |
858 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) | |
859 | */ | |
860 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
861 | int ifindex, struct sock *sk) | |
862 | { | |
863 | struct bcm_sock *bo = bcm_sk(sk); | |
864 | struct bcm_op *op; | |
6f3b911d | 865 | struct canfd_frame *cf; |
5b75c497 OH |
866 | unsigned int i; |
867 | int err; | |
ffd980f9 OH |
868 | |
869 | /* we need a real device to send frames */ | |
870 | if (!ifindex) | |
871 | return -ENODEV; | |
872 | ||
72c8a89a | 873 | /* check nframes boundaries - we need at least one CAN frame */ |
5b75c497 | 874 | if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) |
ffd980f9 OH |
875 | return -EINVAL; |
876 | ||
877 | /* check the given can_id */ | |
2b5f5f5d | 878 | op = bcm_find_op(&bo->tx_ops, msg_head, ifindex); |
ffd980f9 OH |
879 | if (op) { |
880 | /* update existing BCM operation */ | |
881 | ||
882 | /* | |
72c8a89a | 883 | * Do we need more space for the CAN frames than currently |
ffd980f9 OH |
884 | * allocated? -> This is a _really_ unusual use-case and |
885 | * therefore (complexity / locking) it is not supported. | |
886 | */ | |
887 | if (msg_head->nframes > op->nframes) | |
888 | return -E2BIG; | |
889 | ||
72c8a89a | 890 | /* update CAN frames content */ |
ffd980f9 | 891 | for (i = 0; i < msg_head->nframes; i++) { |
7f2d38eb | 892 | |
6f3b911d OH |
893 | cf = op->frames + op->cfsiz * i; |
894 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); | |
895 | ||
896 | if (op->flags & CAN_FD_FRAME) { | |
897 | if (cf->len > 64) | |
898 | err = -EINVAL; | |
899 | } else { | |
900 | if (cf->len > 8) | |
901 | err = -EINVAL; | |
902 | } | |
7f2d38eb | 903 | |
ffd980f9 OH |
904 | if (err < 0) |
905 | return err; | |
906 | ||
907 | if (msg_head->flags & TX_CP_CAN_ID) { | |
908 | /* copy can_id into frame */ | |
6f3b911d | 909 | cf->can_id = msg_head->can_id; |
ffd980f9 OH |
910 | } |
911 | } | |
6f3b911d | 912 | op->flags = msg_head->flags; |
ffd980f9 OH |
913 | |
914 | } else { | |
915 | /* insert new BCM operation for the given can_id */ | |
916 | ||
917 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
918 | if (!op) | |
919 | return -ENOMEM; | |
920 | ||
6f3b911d OH |
921 | op->can_id = msg_head->can_id; |
922 | op->cfsiz = CFSIZ(msg_head->flags); | |
923 | op->flags = msg_head->flags; | |
ffd980f9 | 924 | |
72c8a89a | 925 | /* create array for CAN frames and copy the data */ |
ffd980f9 | 926 | if (msg_head->nframes > 1) { |
6f3b911d | 927 | op->frames = kmalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
928 | GFP_KERNEL); |
929 | if (!op->frames) { | |
930 | kfree(op); | |
931 | return -ENOMEM; | |
932 | } | |
933 | } else | |
934 | op->frames = &op->sframe; | |
935 | ||
936 | for (i = 0; i < msg_head->nframes; i++) { | |
7f2d38eb | 937 | |
6f3b911d OH |
938 | cf = op->frames + op->cfsiz * i; |
939 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); | |
940 | ||
941 | if (op->flags & CAN_FD_FRAME) { | |
942 | if (cf->len > 64) | |
943 | err = -EINVAL; | |
944 | } else { | |
945 | if (cf->len > 8) | |
946 | err = -EINVAL; | |
947 | } | |
7f2d38eb | 948 | |
ffd980f9 OH |
949 | if (err < 0) { |
950 | if (op->frames != &op->sframe) | |
951 | kfree(op->frames); | |
952 | kfree(op); | |
953 | return err; | |
954 | } | |
955 | ||
956 | if (msg_head->flags & TX_CP_CAN_ID) { | |
957 | /* copy can_id into frame */ | |
6f3b911d | 958 | cf->can_id = msg_head->can_id; |
ffd980f9 OH |
959 | } |
960 | } | |
961 | ||
962 | /* tx_ops never compare with previous received messages */ | |
963 | op->last_frames = NULL; | |
964 | ||
965 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
966 | op->sk = sk; | |
967 | op->ifindex = ifindex; | |
968 | ||
969 | /* initialize uninitialized (kzalloc) structure */ | |
73e87e02 OH |
970 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
971 | op->timer.function = bcm_tx_timeout_handler; | |
ffd980f9 | 972 | |
6e5c172c OH |
973 | /* initialize tasklet for tx countevent notification */ |
974 | tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, | |
975 | (unsigned long) op); | |
976 | ||
ffd980f9 | 977 | /* currently unused in tx_ops */ |
73e87e02 | 978 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffd980f9 OH |
979 | |
980 | /* add this bcm_op to the list of the tx_ops */ | |
981 | list_add(&op->list, &bo->tx_ops); | |
982 | ||
983 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ | |
984 | ||
985 | if (op->nframes != msg_head->nframes) { | |
986 | op->nframes = msg_head->nframes; | |
987 | /* start multiple frame transmission with index 0 */ | |
988 | op->currframe = 0; | |
989 | } | |
990 | ||
991 | /* check flags */ | |
992 | ||
ffd980f9 OH |
993 | if (op->flags & TX_RESET_MULTI_IDX) { |
994 | /* start multiple frame transmission with index 0 */ | |
995 | op->currframe = 0; | |
996 | } | |
997 | ||
998 | if (op->flags & SETTIMER) { | |
999 | /* set timer values */ | |
1000 | op->count = msg_head->count; | |
1001 | op->ival1 = msg_head->ival1; | |
1002 | op->ival2 = msg_head->ival2; | |
ba61a8d9 AB |
1003 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
1004 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1005 | |
1006 | /* disable an active timer due to zero values? */ | |
73e87e02 OH |
1007 | if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) |
1008 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1009 | } |
1010 | ||
12d0d0d3 OH |
1011 | if (op->flags & STARTTIMER) { |
1012 | hrtimer_cancel(&op->timer); | |
72c8a89a | 1013 | /* spec: send CAN frame when starting timer */ |
ffd980f9 | 1014 | op->flags |= TX_ANNOUNCE; |
ffd980f9 OH |
1015 | } |
1016 | ||
aabdcb0b | 1017 | if (op->flags & TX_ANNOUNCE) { |
ffd980f9 | 1018 | bcm_can_tx(op); |
12d0d0d3 | 1019 | if (op->count) |
aabdcb0b OH |
1020 | op->count--; |
1021 | } | |
ffd980f9 | 1022 | |
12d0d0d3 OH |
1023 | if (op->flags & STARTTIMER) |
1024 | bcm_tx_start_timer(op); | |
1025 | ||
6f3b911d | 1026 | return msg_head->nframes * op->cfsiz + MHSIZ; |
ffd980f9 OH |
1027 | } |
1028 | ||
1029 | /* | |
1030 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) | |
1031 | */ | |
1032 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
1033 | int ifindex, struct sock *sk) | |
1034 | { | |
1035 | struct bcm_sock *bo = bcm_sk(sk); | |
1036 | struct bcm_op *op; | |
1037 | int do_rx_register; | |
1038 | int err = 0; | |
1039 | ||
1040 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { | |
1041 | /* be robust against wrong usage ... */ | |
1042 | msg_head->flags |= RX_FILTER_ID; | |
1043 | /* ignore trailing garbage */ | |
1044 | msg_head->nframes = 0; | |
1045 | } | |
1046 | ||
5b75c497 OH |
1047 | /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ |
1048 | if (msg_head->nframes > MAX_NFRAMES + 1) | |
1049 | return -EINVAL; | |
1050 | ||
ffd980f9 OH |
1051 | if ((msg_head->flags & RX_RTR_FRAME) && |
1052 | ((msg_head->nframes != 1) || | |
1053 | (!(msg_head->can_id & CAN_RTR_FLAG)))) | |
1054 | return -EINVAL; | |
1055 | ||
1056 | /* check the given can_id */ | |
2b5f5f5d | 1057 | op = bcm_find_op(&bo->rx_ops, msg_head, ifindex); |
ffd980f9 OH |
1058 | if (op) { |
1059 | /* update existing BCM operation */ | |
1060 | ||
1061 | /* | |
72c8a89a | 1062 | * Do we need more space for the CAN frames than currently |
ffd980f9 OH |
1063 | * allocated? -> This is a _really_ unusual use-case and |
1064 | * therefore (complexity / locking) it is not supported. | |
1065 | */ | |
1066 | if (msg_head->nframes > op->nframes) | |
1067 | return -E2BIG; | |
1068 | ||
1069 | if (msg_head->nframes) { | |
72c8a89a | 1070 | /* update CAN frames content */ |
6ce8e9ce | 1071 | err = memcpy_from_msg((u8 *)op->frames, msg, |
6f3b911d | 1072 | msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1073 | if (err < 0) |
1074 | return err; | |
1075 | ||
1076 | /* clear last_frames to indicate 'nothing received' */ | |
6f3b911d | 1077 | memset(op->last_frames, 0, msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1078 | } |
1079 | ||
1080 | op->nframes = msg_head->nframes; | |
6f3b911d | 1081 | op->flags = msg_head->flags; |
ffd980f9 OH |
1082 | |
1083 | /* Only an update -> do not call can_rx_register() */ | |
1084 | do_rx_register = 0; | |
1085 | ||
1086 | } else { | |
1087 | /* insert new BCM operation for the given can_id */ | |
1088 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
1089 | if (!op) | |
1090 | return -ENOMEM; | |
1091 | ||
6f3b911d OH |
1092 | op->can_id = msg_head->can_id; |
1093 | op->nframes = msg_head->nframes; | |
1094 | op->cfsiz = CFSIZ(msg_head->flags); | |
1095 | op->flags = msg_head->flags; | |
ffd980f9 OH |
1096 | |
1097 | if (msg_head->nframes > 1) { | |
72c8a89a | 1098 | /* create array for CAN frames and copy the data */ |
6f3b911d | 1099 | op->frames = kmalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
1100 | GFP_KERNEL); |
1101 | if (!op->frames) { | |
1102 | kfree(op); | |
1103 | return -ENOMEM; | |
1104 | } | |
1105 | ||
72c8a89a | 1106 | /* create and init array for received CAN frames */ |
6f3b911d | 1107 | op->last_frames = kzalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
1108 | GFP_KERNEL); |
1109 | if (!op->last_frames) { | |
1110 | kfree(op->frames); | |
1111 | kfree(op); | |
1112 | return -ENOMEM; | |
1113 | } | |
1114 | ||
1115 | } else { | |
1116 | op->frames = &op->sframe; | |
1117 | op->last_frames = &op->last_sframe; | |
1118 | } | |
1119 | ||
1120 | if (msg_head->nframes) { | |
6ce8e9ce | 1121 | err = memcpy_from_msg((u8 *)op->frames, msg, |
6f3b911d | 1122 | msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1123 | if (err < 0) { |
1124 | if (op->frames != &op->sframe) | |
1125 | kfree(op->frames); | |
1126 | if (op->last_frames != &op->last_sframe) | |
1127 | kfree(op->last_frames); | |
1128 | kfree(op); | |
1129 | return err; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
1134 | op->sk = sk; | |
1135 | op->ifindex = ifindex; | |
1136 | ||
81b40110 OH |
1137 | /* ifindex for timeout events w/o previous frame reception */ |
1138 | op->rx_ifindex = ifindex; | |
1139 | ||
ffd980f9 | 1140 | /* initialize uninitialized (kzalloc) structure */ |
73e87e02 OH |
1141 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1142 | op->timer.function = bcm_rx_timeout_handler; | |
ffd980f9 | 1143 | |
6e5c172c OH |
1144 | /* initialize tasklet for rx timeout notification */ |
1145 | tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, | |
1146 | (unsigned long) op); | |
1147 | ||
73e87e02 OH |
1148 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1149 | op->thrtimer.function = bcm_rx_thr_handler; | |
ffd980f9 | 1150 | |
6e5c172c OH |
1151 | /* initialize tasklet for rx throttle handling */ |
1152 | tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, | |
1153 | (unsigned long) op); | |
1154 | ||
ffd980f9 OH |
1155 | /* add this bcm_op to the list of the rx_ops */ |
1156 | list_add(&op->list, &bo->rx_ops); | |
1157 | ||
1158 | /* call can_rx_register() */ | |
1159 | do_rx_register = 1; | |
1160 | ||
1161 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ | |
1162 | ||
1163 | /* check flags */ | |
ffd980f9 OH |
1164 | |
1165 | if (op->flags & RX_RTR_FRAME) { | |
1166 | ||
1167 | /* no timers in RTR-mode */ | |
73e87e02 OH |
1168 | hrtimer_cancel(&op->thrtimer); |
1169 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1170 | |
1171 | /* | |
1172 | * funny feature in RX(!)_SETUP only for RTR-mode: | |
1173 | * copy can_id into frame BUT without RTR-flag to | |
1174 | * prevent a full-load-loopback-test ... ;-] | |
1175 | */ | |
1176 | if ((op->flags & TX_CP_CAN_ID) || | |
1177 | (op->frames[0].can_id == op->can_id)) | |
1178 | op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG; | |
1179 | ||
1180 | } else { | |
1181 | if (op->flags & SETTIMER) { | |
1182 | ||
1183 | /* set timer value */ | |
1184 | op->ival1 = msg_head->ival1; | |
1185 | op->ival2 = msg_head->ival2; | |
ba61a8d9 AB |
1186 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
1187 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1188 | |
1189 | /* disable an active timer due to zero value? */ | |
73e87e02 OH |
1190 | if (!op->kt_ival1.tv64) |
1191 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1192 | |
1193 | /* | |
73e87e02 OH |
1194 | * In any case cancel the throttle timer, flush |
1195 | * potentially blocked msgs and reset throttle handling | |
ffd980f9 | 1196 | */ |
73e87e02 OH |
1197 | op->kt_lastmsg = ktime_set(0, 0); |
1198 | hrtimer_cancel(&op->thrtimer); | |
6e5c172c | 1199 | bcm_rx_thr_flush(op, 1); |
ffd980f9 OH |
1200 | } |
1201 | ||
73e87e02 OH |
1202 | if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) |
1203 | hrtimer_start(&op->timer, op->kt_ival1, | |
1204 | HRTIMER_MODE_REL); | |
ffd980f9 OH |
1205 | } |
1206 | ||
1207 | /* now we can register for can_ids, if we added a new bcm_op */ | |
1208 | if (do_rx_register) { | |
1209 | if (ifindex) { | |
1210 | struct net_device *dev; | |
1211 | ||
1212 | dev = dev_get_by_index(&init_net, ifindex); | |
1213 | if (dev) { | |
1214 | err = can_rx_register(dev, op->can_id, | |
1215 | REGMASK(op->can_id), | |
1216 | bcm_rx_handler, op, | |
1217 | "bcm"); | |
1218 | ||
1219 | op->rx_reg_dev = dev; | |
1220 | dev_put(dev); | |
1221 | } | |
1222 | ||
1223 | } else | |
1224 | err = can_rx_register(NULL, op->can_id, | |
1225 | REGMASK(op->can_id), | |
1226 | bcm_rx_handler, op, "bcm"); | |
1227 | if (err) { | |
1228 | /* this bcm rx op is broken -> remove it */ | |
1229 | list_del(&op->list); | |
1230 | bcm_remove_op(op); | |
1231 | return err; | |
1232 | } | |
1233 | } | |
1234 | ||
6f3b911d | 1235 | return msg_head->nframes * op->cfsiz + MHSIZ; |
ffd980f9 OH |
1236 | } |
1237 | ||
1238 | /* | |
1239 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) | |
1240 | */ | |
2b5f5f5d OH |
1241 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk, |
1242 | int cfsiz) | |
ffd980f9 OH |
1243 | { |
1244 | struct sk_buff *skb; | |
1245 | struct net_device *dev; | |
1246 | int err; | |
1247 | ||
1248 | /* we need a real device to send frames */ | |
1249 | if (!ifindex) | |
1250 | return -ENODEV; | |
1251 | ||
2b5f5f5d | 1252 | skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL); |
ffd980f9 OH |
1253 | if (!skb) |
1254 | return -ENOMEM; | |
1255 | ||
2bf3440d | 1256 | can_skb_reserve(skb); |
156c2bb9 | 1257 | |
2b5f5f5d | 1258 | err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz); |
ffd980f9 OH |
1259 | if (err < 0) { |
1260 | kfree_skb(skb); | |
1261 | return err; | |
1262 | } | |
1263 | ||
1264 | dev = dev_get_by_index(&init_net, ifindex); | |
1265 | if (!dev) { | |
1266 | kfree_skb(skb); | |
1267 | return -ENODEV; | |
1268 | } | |
1269 | ||
2bf3440d | 1270 | can_skb_prv(skb)->ifindex = dev->ifindex; |
d3b58c47 | 1271 | can_skb_prv(skb)->skbcnt = 0; |
ffd980f9 | 1272 | skb->dev = dev; |
0ae89beb | 1273 | can_skb_set_owner(skb, sk); |
7f2d38eb | 1274 | err = can_send(skb, 1); /* send with loopback */ |
ffd980f9 OH |
1275 | dev_put(dev); |
1276 | ||
7f2d38eb OH |
1277 | if (err) |
1278 | return err; | |
1279 | ||
2b5f5f5d | 1280 | return cfsiz + MHSIZ; |
ffd980f9 OH |
1281 | } |
1282 | ||
1283 | /* | |
1284 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace | |
1285 | */ | |
1b784140 | 1286 | static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
ffd980f9 OH |
1287 | { |
1288 | struct sock *sk = sock->sk; | |
1289 | struct bcm_sock *bo = bcm_sk(sk); | |
1290 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ | |
1291 | struct bcm_msg_head msg_head; | |
6f3b911d | 1292 | int cfsiz; |
ffd980f9 OH |
1293 | int ret; /* read bytes or error codes as return value */ |
1294 | ||
1295 | if (!bo->bound) | |
1296 | return -ENOTCONN; | |
1297 | ||
7f2d38eb | 1298 | /* check for valid message length from userspace */ |
2b5f5f5d OH |
1299 | if (size < MHSIZ) |
1300 | return -EINVAL; | |
1301 | ||
1302 | /* read message head information */ | |
1303 | ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ); | |
1304 | if (ret < 0) | |
1305 | return ret; | |
1306 | ||
6f3b911d OH |
1307 | cfsiz = CFSIZ(msg_head.flags); |
1308 | if ((size - MHSIZ) % cfsiz) | |
7f2d38eb OH |
1309 | return -EINVAL; |
1310 | ||
ffd980f9 OH |
1311 | /* check for alternative ifindex for this bcm_op */ |
1312 | ||
1313 | if (!ifindex && msg->msg_name) { | |
1314 | /* no bound device as default => check msg_name */ | |
342dfc30 | 1315 | DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); |
ffd980f9 | 1316 | |
5e507328 KVD |
1317 | if (msg->msg_namelen < sizeof(*addr)) |
1318 | return -EINVAL; | |
1319 | ||
ffd980f9 OH |
1320 | if (addr->can_family != AF_CAN) |
1321 | return -EINVAL; | |
1322 | ||
1323 | /* ifindex from sendto() */ | |
1324 | ifindex = addr->can_ifindex; | |
1325 | ||
1326 | if (ifindex) { | |
1327 | struct net_device *dev; | |
1328 | ||
1329 | dev = dev_get_by_index(&init_net, ifindex); | |
1330 | if (!dev) | |
1331 | return -ENODEV; | |
1332 | ||
1333 | if (dev->type != ARPHRD_CAN) { | |
1334 | dev_put(dev); | |
1335 | return -ENODEV; | |
1336 | } | |
1337 | ||
1338 | dev_put(dev); | |
1339 | } | |
1340 | } | |
1341 | ||
ffd980f9 OH |
1342 | lock_sock(sk); |
1343 | ||
1344 | switch (msg_head.opcode) { | |
1345 | ||
1346 | case TX_SETUP: | |
1347 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); | |
1348 | break; | |
1349 | ||
1350 | case RX_SETUP: | |
1351 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); | |
1352 | break; | |
1353 | ||
1354 | case TX_DELETE: | |
2b5f5f5d | 1355 | if (bcm_delete_tx_op(&bo->tx_ops, &msg_head, ifindex)) |
ffd980f9 OH |
1356 | ret = MHSIZ; |
1357 | else | |
1358 | ret = -EINVAL; | |
1359 | break; | |
1360 | ||
1361 | case RX_DELETE: | |
2b5f5f5d | 1362 | if (bcm_delete_rx_op(&bo->rx_ops, &msg_head, ifindex)) |
ffd980f9 OH |
1363 | ret = MHSIZ; |
1364 | else | |
1365 | ret = -EINVAL; | |
1366 | break; | |
1367 | ||
1368 | case TX_READ: | |
1369 | /* reuse msg_head for the reply to TX_READ */ | |
1370 | msg_head.opcode = TX_STATUS; | |
1371 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); | |
1372 | break; | |
1373 | ||
1374 | case RX_READ: | |
1375 | /* reuse msg_head for the reply to RX_READ */ | |
1376 | msg_head.opcode = RX_STATUS; | |
1377 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); | |
1378 | break; | |
1379 | ||
1380 | case TX_SEND: | |
72c8a89a | 1381 | /* we need exactly one CAN frame behind the msg head */ |
6f3b911d | 1382 | if ((msg_head.nframes != 1) || (size != cfsiz + MHSIZ)) |
ffd980f9 OH |
1383 | ret = -EINVAL; |
1384 | else | |
6f3b911d | 1385 | ret = bcm_tx_send(msg, ifindex, sk, cfsiz); |
ffd980f9 OH |
1386 | break; |
1387 | ||
1388 | default: | |
1389 | ret = -EINVAL; | |
1390 | break; | |
1391 | } | |
1392 | ||
1393 | release_sock(sk); | |
1394 | ||
1395 | return ret; | |
1396 | } | |
1397 | ||
1398 | /* | |
1399 | * notification handler for netdevice status changes | |
1400 | */ | |
1401 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, | |
351638e7 | 1402 | void *ptr) |
ffd980f9 | 1403 | { |
351638e7 | 1404 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
ffd980f9 OH |
1405 | struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); |
1406 | struct sock *sk = &bo->sk; | |
1407 | struct bcm_op *op; | |
1408 | int notify_enodev = 0; | |
1409 | ||
721499e8 | 1410 | if (!net_eq(dev_net(dev), &init_net)) |
ffd980f9 OH |
1411 | return NOTIFY_DONE; |
1412 | ||
1413 | if (dev->type != ARPHRD_CAN) | |
1414 | return NOTIFY_DONE; | |
1415 | ||
1416 | switch (msg) { | |
1417 | ||
1418 | case NETDEV_UNREGISTER: | |
1419 | lock_sock(sk); | |
1420 | ||
1421 | /* remove device specific receive entries */ | |
1422 | list_for_each_entry(op, &bo->rx_ops, list) | |
1423 | if (op->rx_reg_dev == dev) | |
1424 | bcm_rx_unreg(dev, op); | |
1425 | ||
1426 | /* remove device reference, if this is our bound device */ | |
1427 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1428 | bo->bound = 0; | |
1429 | bo->ifindex = 0; | |
1430 | notify_enodev = 1; | |
1431 | } | |
1432 | ||
1433 | release_sock(sk); | |
1434 | ||
1435 | if (notify_enodev) { | |
1436 | sk->sk_err = ENODEV; | |
1437 | if (!sock_flag(sk, SOCK_DEAD)) | |
1438 | sk->sk_error_report(sk); | |
1439 | } | |
1440 | break; | |
1441 | ||
1442 | case NETDEV_DOWN: | |
1443 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1444 | sk->sk_err = ENETDOWN; | |
1445 | if (!sock_flag(sk, SOCK_DEAD)) | |
1446 | sk->sk_error_report(sk); | |
1447 | } | |
1448 | } | |
1449 | ||
1450 | return NOTIFY_DONE; | |
1451 | } | |
1452 | ||
1453 | /* | |
1454 | * initial settings for all BCM sockets to be set at socket creation time | |
1455 | */ | |
1456 | static int bcm_init(struct sock *sk) | |
1457 | { | |
1458 | struct bcm_sock *bo = bcm_sk(sk); | |
1459 | ||
1460 | bo->bound = 0; | |
1461 | bo->ifindex = 0; | |
1462 | bo->dropped_usr_msgs = 0; | |
1463 | bo->bcm_proc_read = NULL; | |
1464 | ||
1465 | INIT_LIST_HEAD(&bo->tx_ops); | |
1466 | INIT_LIST_HEAD(&bo->rx_ops); | |
1467 | ||
1468 | /* set notifier */ | |
1469 | bo->notifier.notifier_call = bcm_notifier; | |
1470 | ||
1471 | register_netdevice_notifier(&bo->notifier); | |
1472 | ||
1473 | return 0; | |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * standard socket functions | |
1478 | */ | |
1479 | static int bcm_release(struct socket *sock) | |
1480 | { | |
1481 | struct sock *sk = sock->sk; | |
c6914a6f | 1482 | struct bcm_sock *bo; |
ffd980f9 OH |
1483 | struct bcm_op *op, *next; |
1484 | ||
c6914a6f DJ |
1485 | if (sk == NULL) |
1486 | return 0; | |
1487 | ||
1488 | bo = bcm_sk(sk); | |
1489 | ||
ffd980f9 OH |
1490 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
1491 | ||
1492 | unregister_netdevice_notifier(&bo->notifier); | |
1493 | ||
1494 | lock_sock(sk); | |
1495 | ||
1496 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) | |
1497 | bcm_remove_op(op); | |
1498 | ||
1499 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { | |
1500 | /* | |
1501 | * Don't care if we're bound or not (due to netdev problems) | |
1502 | * can_rx_unregister() is always a save thing to do here. | |
1503 | */ | |
1504 | if (op->ifindex) { | |
1505 | /* | |
1506 | * Only remove subscriptions that had not | |
1507 | * been removed due to NETDEV_UNREGISTER | |
1508 | * in bcm_notifier() | |
1509 | */ | |
1510 | if (op->rx_reg_dev) { | |
1511 | struct net_device *dev; | |
1512 | ||
1513 | dev = dev_get_by_index(&init_net, op->ifindex); | |
1514 | if (dev) { | |
1515 | bcm_rx_unreg(dev, op); | |
1516 | dev_put(dev); | |
1517 | } | |
1518 | } | |
1519 | } else | |
1520 | can_rx_unregister(NULL, op->can_id, | |
1521 | REGMASK(op->can_id), | |
1522 | bcm_rx_handler, op); | |
1523 | ||
1524 | bcm_remove_op(op); | |
1525 | } | |
1526 | ||
1527 | /* remove procfs entry */ | |
1528 | if (proc_dir && bo->bcm_proc_read) | |
1529 | remove_proc_entry(bo->procname, proc_dir); | |
1530 | ||
1531 | /* remove device reference */ | |
1532 | if (bo->bound) { | |
1533 | bo->bound = 0; | |
1534 | bo->ifindex = 0; | |
1535 | } | |
1536 | ||
f7e5cc0c LW |
1537 | sock_orphan(sk); |
1538 | sock->sk = NULL; | |
1539 | ||
ffd980f9 OH |
1540 | release_sock(sk); |
1541 | sock_put(sk); | |
1542 | ||
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, | |
1547 | int flags) | |
1548 | { | |
1549 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1550 | struct sock *sk = sock->sk; | |
1551 | struct bcm_sock *bo = bcm_sk(sk); | |
1552 | ||
6503d961 CG |
1553 | if (len < sizeof(*addr)) |
1554 | return -EINVAL; | |
1555 | ||
ffd980f9 OH |
1556 | if (bo->bound) |
1557 | return -EISCONN; | |
1558 | ||
1559 | /* bind a device to this socket */ | |
1560 | if (addr->can_ifindex) { | |
1561 | struct net_device *dev; | |
1562 | ||
1563 | dev = dev_get_by_index(&init_net, addr->can_ifindex); | |
1564 | if (!dev) | |
1565 | return -ENODEV; | |
1566 | ||
1567 | if (dev->type != ARPHRD_CAN) { | |
1568 | dev_put(dev); | |
1569 | return -ENODEV; | |
1570 | } | |
1571 | ||
1572 | bo->ifindex = dev->ifindex; | |
1573 | dev_put(dev); | |
1574 | ||
1575 | } else { | |
1576 | /* no interface reference for ifindex = 0 ('any' CAN device) */ | |
1577 | bo->ifindex = 0; | |
1578 | } | |
1579 | ||
1580 | bo->bound = 1; | |
1581 | ||
1582 | if (proc_dir) { | |
1583 | /* unique socket address as filename */ | |
9f260e0e | 1584 | sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
ea00b8e2 AD |
1585 | bo->bcm_proc_read = proc_create_data(bo->procname, 0644, |
1586 | proc_dir, | |
1587 | &bcm_proc_fops, sk); | |
ffd980f9 OH |
1588 | } |
1589 | ||
1590 | return 0; | |
1591 | } | |
1592 | ||
1b784140 YX |
1593 | static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1594 | int flags) | |
ffd980f9 OH |
1595 | { |
1596 | struct sock *sk = sock->sk; | |
1597 | struct sk_buff *skb; | |
1598 | int error = 0; | |
1599 | int noblock; | |
1600 | int err; | |
1601 | ||
1602 | noblock = flags & MSG_DONTWAIT; | |
1603 | flags &= ~MSG_DONTWAIT; | |
1604 | skb = skb_recv_datagram(sk, flags, noblock, &error); | |
1605 | if (!skb) | |
1606 | return error; | |
1607 | ||
1608 | if (skb->len < size) | |
1609 | size = skb->len; | |
1610 | ||
7eab8d9e | 1611 | err = memcpy_to_msg(msg, skb->data, size); |
ffd980f9 OH |
1612 | if (err < 0) { |
1613 | skb_free_datagram(sk, skb); | |
1614 | return err; | |
1615 | } | |
1616 | ||
3b885787 | 1617 | sock_recv_ts_and_drops(msg, sk, skb); |
ffd980f9 OH |
1618 | |
1619 | if (msg->msg_name) { | |
342dfc30 | 1620 | __sockaddr_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
1621 | msg->msg_namelen = sizeof(struct sockaddr_can); |
1622 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1623 | } | |
1624 | ||
1625 | skb_free_datagram(sk, skb); | |
1626 | ||
1627 | return size; | |
1628 | } | |
1629 | ||
53914b67 | 1630 | static const struct proto_ops bcm_ops = { |
ffd980f9 OH |
1631 | .family = PF_CAN, |
1632 | .release = bcm_release, | |
1633 | .bind = sock_no_bind, | |
1634 | .connect = bcm_connect, | |
1635 | .socketpair = sock_no_socketpair, | |
1636 | .accept = sock_no_accept, | |
1637 | .getname = sock_no_getname, | |
1638 | .poll = datagram_poll, | |
53914b67 | 1639 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
ffd980f9 OH |
1640 | .listen = sock_no_listen, |
1641 | .shutdown = sock_no_shutdown, | |
1642 | .setsockopt = sock_no_setsockopt, | |
1643 | .getsockopt = sock_no_getsockopt, | |
1644 | .sendmsg = bcm_sendmsg, | |
1645 | .recvmsg = bcm_recvmsg, | |
1646 | .mmap = sock_no_mmap, | |
1647 | .sendpage = sock_no_sendpage, | |
1648 | }; | |
1649 | ||
1650 | static struct proto bcm_proto __read_mostly = { | |
1651 | .name = "CAN_BCM", | |
1652 | .owner = THIS_MODULE, | |
1653 | .obj_size = sizeof(struct bcm_sock), | |
1654 | .init = bcm_init, | |
1655 | }; | |
1656 | ||
1650629d | 1657 | static const struct can_proto bcm_can_proto = { |
ffd980f9 OH |
1658 | .type = SOCK_DGRAM, |
1659 | .protocol = CAN_BCM, | |
ffd980f9 OH |
1660 | .ops = &bcm_ops, |
1661 | .prot = &bcm_proto, | |
1662 | }; | |
1663 | ||
1664 | static int __init bcm_module_init(void) | |
1665 | { | |
1666 | int err; | |
1667 | ||
b111b78c | 1668 | pr_info("can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"); |
ffd980f9 OH |
1669 | |
1670 | err = can_proto_register(&bcm_can_proto); | |
1671 | if (err < 0) { | |
1672 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); | |
1673 | return err; | |
1674 | } | |
1675 | ||
1676 | /* create /proc/net/can-bcm directory */ | |
1677 | proc_dir = proc_mkdir("can-bcm", init_net.proc_net); | |
ffd980f9 OH |
1678 | return 0; |
1679 | } | |
1680 | ||
1681 | static void __exit bcm_module_exit(void) | |
1682 | { | |
1683 | can_proto_unregister(&bcm_can_proto); | |
1684 | ||
1685 | if (proc_dir) | |
ece31ffd | 1686 | remove_proc_entry("can-bcm", init_net.proc_net); |
ffd980f9 OH |
1687 | } |
1688 | ||
1689 | module_init(bcm_module_init); | |
1690 | module_exit(bcm_module_exit); |