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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 | * | |
384317ef | 4 | * Copyright (c) 2002-2017 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 | |
384317ef | 80 | #define CAN_BCM_VERSION "20170425" |
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 | ||
ffd980f9 OH |
121 | struct bcm_sock { |
122 | struct sock sk; | |
123 | int bound; | |
124 | int ifindex; | |
125 | struct notifier_block notifier; | |
126 | struct list_head rx_ops; | |
127 | struct list_head tx_ops; | |
128 | unsigned long dropped_usr_msgs; | |
129 | struct proc_dir_entry *bcm_proc_read; | |
9f260e0e | 130 | char procname [32]; /* inode number in decimal with \0 */ |
ffd980f9 OH |
131 | }; |
132 | ||
133 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) | |
134 | { | |
135 | return (struct bcm_sock *)sk; | |
136 | } | |
137 | ||
ba61a8d9 AB |
138 | static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv) |
139 | { | |
140 | return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC); | |
141 | } | |
142 | ||
6f3b911d | 143 | #define CFSIZ(flags) ((flags & CAN_FD_FRAME) ? CANFD_MTU : CAN_MTU) |
ffd980f9 OH |
144 | #define OPSIZ sizeof(struct bcm_op) |
145 | #define MHSIZ sizeof(struct bcm_msg_head) | |
146 | ||
ffd980f9 OH |
147 | /* |
148 | * procfs functions | |
149 | */ | |
c2701b37 | 150 | #if IS_ENABLED(CONFIG_PROC_FS) |
384317ef | 151 | static char *bcm_proc_getifname(struct net *net, 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(); |
384317ef | 159 | dev = dev_get_by_index_rcu(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]; |
384317ef OH |
172 | struct net *net = m->private; |
173 | struct sock *sk = (struct sock *)PDE_DATA(m->file->f_inode); | |
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); |
384317ef | 181 | seq_printf(m, " / bound %s", bcm_proc_getifname(net, 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 | 192 | seq_printf(m, "rx_op: %03X %-5s ", op->can_id, |
384317ef | 193 | bcm_proc_getifname(net, ifname, op->ifindex)); |
6f3b911d OH |
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 | 221 | seq_printf(m, "tx_op: %03X %s ", op->can_id, |
384317ef | 222 | bcm_proc_getifname(net, ifname, op->ifindex)); |
6f3b911d OH |
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 | { | |
384317ef | 245 | return single_open_net(inode, file, bcm_proc_show); |
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 | }; | |
c2701b37 | 255 | #endif /* CONFIG_PROC_FS */ |
ea00b8e2 | 256 | |
ffd980f9 OH |
257 | /* |
258 | * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface | |
259 | * of the given bcm tx op | |
260 | */ | |
261 | static void bcm_can_tx(struct bcm_op *op) | |
262 | { | |
263 | struct sk_buff *skb; | |
264 | struct net_device *dev; | |
6f3b911d | 265 | struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe; |
ffd980f9 OH |
266 | |
267 | /* no target device? => exit */ | |
268 | if (!op->ifindex) | |
269 | return; | |
270 | ||
384317ef | 271 | dev = dev_get_by_index(sock_net(op->sk), op->ifindex); |
ffd980f9 OH |
272 | if (!dev) { |
273 | /* RFC: should this bcm_op remove itself here? */ | |
274 | return; | |
275 | } | |
276 | ||
6f3b911d | 277 | skb = alloc_skb(op->cfsiz + sizeof(struct can_skb_priv), gfp_any()); |
ffd980f9 OH |
278 | if (!skb) |
279 | goto out; | |
280 | ||
2bf3440d OH |
281 | can_skb_reserve(skb); |
282 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 283 | can_skb_prv(skb)->skbcnt = 0; |
156c2bb9 | 284 | |
59ae1d12 | 285 | skb_put_data(skb, cf, op->cfsiz); |
ffd980f9 OH |
286 | |
287 | /* send with loopback */ | |
288 | skb->dev = dev; | |
0ae89beb | 289 | can_skb_set_owner(skb, op->sk); |
ffd980f9 OH |
290 | can_send(skb, 1); |
291 | ||
292 | /* update statistics */ | |
293 | op->currframe++; | |
294 | op->frames_abs++; | |
295 | ||
296 | /* reached last frame? */ | |
297 | if (op->currframe >= op->nframes) | |
298 | op->currframe = 0; | |
95acb490 | 299 | out: |
ffd980f9 OH |
300 | dev_put(dev); |
301 | } | |
302 | ||
303 | /* | |
304 | * bcm_send_to_user - send a BCM message to the userspace | |
305 | * (consisting of bcm_msg_head + x CAN frames) | |
306 | */ | |
307 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, | |
6f3b911d | 308 | struct canfd_frame *frames, int has_timestamp) |
ffd980f9 OH |
309 | { |
310 | struct sk_buff *skb; | |
6f3b911d | 311 | struct canfd_frame *firstframe; |
ffd980f9 OH |
312 | struct sockaddr_can *addr; |
313 | struct sock *sk = op->sk; | |
6f3b911d | 314 | unsigned int datalen = head->nframes * op->cfsiz; |
ffd980f9 OH |
315 | int err; |
316 | ||
317 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); | |
318 | if (!skb) | |
319 | return; | |
320 | ||
59ae1d12 | 321 | skb_put_data(skb, head, sizeof(*head)); |
ffd980f9 OH |
322 | |
323 | if (head->nframes) { | |
72c8a89a | 324 | /* CAN frames starting here */ |
6f3b911d | 325 | firstframe = (struct canfd_frame *)skb_tail_pointer(skb); |
ffd980f9 | 326 | |
59ae1d12 | 327 | skb_put_data(skb, frames, datalen); |
ffd980f9 OH |
328 | |
329 | /* | |
6f3b911d | 330 | * the BCM uses the flags-element of the canfd_frame |
ffd980f9 OH |
331 | * structure for internal purposes. This is only |
332 | * relevant for updates that are generated by the | |
333 | * BCM, where nframes is 1 | |
334 | */ | |
335 | if (head->nframes == 1) | |
6f3b911d | 336 | firstframe->flags &= BCM_CAN_FLAGS_MASK; |
ffd980f9 OH |
337 | } |
338 | ||
339 | if (has_timestamp) { | |
340 | /* restore rx timestamp */ | |
341 | skb->tstamp = op->rx_stamp; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Put the datagram to the queue so that bcm_recvmsg() can | |
346 | * get it from there. We need to pass the interface index to | |
347 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
348 | * containing the interface index. | |
349 | */ | |
350 | ||
b4772ef8 | 351 | sock_skb_cb_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
352 | addr = (struct sockaddr_can *)skb->cb; |
353 | memset(addr, 0, sizeof(*addr)); | |
354 | addr->can_family = AF_CAN; | |
355 | addr->can_ifindex = op->rx_ifindex; | |
356 | ||
357 | err = sock_queue_rcv_skb(sk, skb); | |
358 | if (err < 0) { | |
359 | struct bcm_sock *bo = bcm_sk(sk); | |
360 | ||
361 | kfree_skb(skb); | |
362 | /* don't care about overflows in this statistic */ | |
363 | bo->dropped_usr_msgs++; | |
364 | } | |
365 | } | |
366 | ||
12d0d0d3 OH |
367 | static void bcm_tx_start_timer(struct bcm_op *op) |
368 | { | |
2456e855 | 369 | if (op->kt_ival1 && op->count) |
12d0d0d3 OH |
370 | hrtimer_start(&op->timer, |
371 | ktime_add(ktime_get(), op->kt_ival1), | |
372 | HRTIMER_MODE_ABS); | |
2456e855 | 373 | else if (op->kt_ival2) |
12d0d0d3 OH |
374 | hrtimer_start(&op->timer, |
375 | ktime_add(ktime_get(), op->kt_ival2), | |
376 | HRTIMER_MODE_ABS); | |
377 | } | |
378 | ||
6e5c172c OH |
379 | static void bcm_tx_timeout_tsklet(unsigned long data) |
380 | { | |
381 | struct bcm_op *op = (struct bcm_op *)data; | |
382 | struct bcm_msg_head msg_head; | |
383 | ||
2456e855 | 384 | if (op->kt_ival1 && (op->count > 0)) { |
ffd980f9 OH |
385 | |
386 | op->count--; | |
c53a6ee8 OH |
387 | if (!op->count && (op->flags & TX_COUNTEVT)) { |
388 | ||
389 | /* create notification to user */ | |
390 | msg_head.opcode = TX_EXPIRED; | |
391 | msg_head.flags = op->flags; | |
392 | msg_head.count = op->count; | |
393 | msg_head.ival1 = op->ival1; | |
394 | msg_head.ival2 = op->ival2; | |
395 | msg_head.can_id = op->can_id; | |
396 | msg_head.nframes = 0; | |
397 | ||
398 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
399 | } | |
ffd980f9 | 400 | bcm_can_tx(op); |
ffd980f9 | 401 | |
2456e855 | 402 | } else if (op->kt_ival2) |
12d0d0d3 | 403 | bcm_can_tx(op); |
ffd980f9 | 404 | |
12d0d0d3 | 405 | bcm_tx_start_timer(op); |
c53a6ee8 OH |
406 | } |
407 | ||
408 | /* | |
25985edc | 409 | * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions |
c53a6ee8 OH |
410 | */ |
411 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) | |
412 | { | |
413 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
414 | ||
415 | tasklet_schedule(&op->tsklet); | |
ffd980f9 | 416 | |
c53a6ee8 | 417 | return HRTIMER_NORESTART; |
ffd980f9 OH |
418 | } |
419 | ||
420 | /* | |
421 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content | |
422 | */ | |
6f3b911d | 423 | static void bcm_rx_changed(struct bcm_op *op, struct canfd_frame *data) |
ffd980f9 OH |
424 | { |
425 | struct bcm_msg_head head; | |
426 | ||
ffd980f9 OH |
427 | /* update statistics */ |
428 | op->frames_filtered++; | |
429 | ||
430 | /* prevent statistics overflow */ | |
431 | if (op->frames_filtered > ULONG_MAX/100) | |
432 | op->frames_filtered = op->frames_abs = 0; | |
433 | ||
6e5c172c | 434 | /* this element is not throttled anymore */ |
6f3b911d | 435 | data->flags &= (BCM_CAN_FLAGS_MASK|RX_RECV); |
6e5c172c | 436 | |
ffd980f9 OH |
437 | head.opcode = RX_CHANGED; |
438 | head.flags = op->flags; | |
439 | head.count = op->count; | |
440 | head.ival1 = op->ival1; | |
441 | head.ival2 = op->ival2; | |
442 | head.can_id = op->can_id; | |
443 | head.nframes = 1; | |
444 | ||
445 | bcm_send_to_user(op, &head, data, 1); | |
446 | } | |
447 | ||
448 | /* | |
449 | * bcm_rx_update_and_send - process a detected relevant receive content change | |
450 | * 1. update the last received data | |
451 | * 2. send a notification to the user (if possible) | |
452 | */ | |
453 | static void bcm_rx_update_and_send(struct bcm_op *op, | |
6f3b911d OH |
454 | struct canfd_frame *lastdata, |
455 | const struct canfd_frame *rxdata) | |
ffd980f9 | 456 | { |
6f3b911d | 457 | memcpy(lastdata, rxdata, op->cfsiz); |
ffd980f9 | 458 | |
6e5c172c | 459 | /* mark as used and throttled by default */ |
6f3b911d | 460 | lastdata->flags |= (RX_RECV|RX_THR); |
ffd980f9 | 461 | |
069f8457 | 462 | /* throttling mode inactive ? */ |
2456e855 | 463 | if (!op->kt_ival2) { |
73e87e02 | 464 | /* send RX_CHANGED to the user immediately */ |
6e5c172c | 465 | bcm_rx_changed(op, lastdata); |
73e87e02 OH |
466 | return; |
467 | } | |
ffd980f9 | 468 | |
6e5c172c OH |
469 | /* with active throttling timer we are just done here */ |
470 | if (hrtimer_active(&op->thrtimer)) | |
73e87e02 | 471 | return; |
ffd980f9 | 472 | |
069f8457 | 473 | /* first reception with enabled throttling mode */ |
2456e855 | 474 | if (!op->kt_lastmsg) |
6e5c172c | 475 | goto rx_changed_settime; |
73e87e02 | 476 | |
6e5c172c | 477 | /* got a second frame inside a potential throttle period? */ |
73e87e02 OH |
478 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
479 | ktime_to_us(op->kt_ival2)) { | |
6e5c172c | 480 | /* do not send the saved data - only start throttle timer */ |
73e87e02 OH |
481 | hrtimer_start(&op->thrtimer, |
482 | ktime_add(op->kt_lastmsg, op->kt_ival2), | |
483 | HRTIMER_MODE_ABS); | |
484 | return; | |
485 | } | |
486 | ||
487 | /* the gap was that big, that throttling was not needed here */ | |
6e5c172c OH |
488 | rx_changed_settime: |
489 | bcm_rx_changed(op, lastdata); | |
73e87e02 | 490 | op->kt_lastmsg = ktime_get(); |
ffd980f9 OH |
491 | } |
492 | ||
493 | /* | |
494 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly | |
495 | * received data stored in op->last_frames[] | |
496 | */ | |
5b75c497 | 497 | static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
6f3b911d | 498 | const struct canfd_frame *rxdata) |
ffd980f9 | 499 | { |
6f3b911d OH |
500 | struct canfd_frame *cf = op->frames + op->cfsiz * index; |
501 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; | |
502 | int i; | |
503 | ||
ffd980f9 | 504 | /* |
6f3b911d | 505 | * no one uses the MSBs of flags for comparison, |
ffd980f9 OH |
506 | * so we use it here to detect the first time of reception |
507 | */ | |
508 | ||
6f3b911d | 509 | if (!(lcf->flags & RX_RECV)) { |
ffd980f9 | 510 | /* received data for the first time => send update to user */ |
6f3b911d | 511 | bcm_rx_update_and_send(op, lcf, rxdata); |
ffd980f9 OH |
512 | return; |
513 | } | |
514 | ||
72c8a89a | 515 | /* do a real check in CAN frame data section */ |
6f3b911d OH |
516 | for (i = 0; i < rxdata->len; i += 8) { |
517 | if ((get_u64(cf, i) & get_u64(rxdata, i)) != | |
518 | (get_u64(cf, i) & get_u64(lcf, i))) { | |
519 | bcm_rx_update_and_send(op, lcf, rxdata); | |
520 | return; | |
521 | } | |
ffd980f9 OH |
522 | } |
523 | ||
524 | if (op->flags & RX_CHECK_DLC) { | |
6f3b911d OH |
525 | /* do a real check in CAN frame length */ |
526 | if (rxdata->len != lcf->len) { | |
527 | bcm_rx_update_and_send(op, lcf, rxdata); | |
ffd980f9 OH |
528 | return; |
529 | } | |
530 | } | |
531 | } | |
532 | ||
533 | /* | |
069f8457 | 534 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame reception |
ffd980f9 OH |
535 | */ |
536 | static void bcm_rx_starttimer(struct bcm_op *op) | |
537 | { | |
538 | if (op->flags & RX_NO_AUTOTIMER) | |
539 | return; | |
540 | ||
2456e855 | 541 | if (op->kt_ival1) |
73e87e02 | 542 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); |
ffd980f9 OH |
543 | } |
544 | ||
6e5c172c | 545 | static void bcm_rx_timeout_tsklet(unsigned long data) |
ffd980f9 | 546 | { |
6e5c172c | 547 | struct bcm_op *op = (struct bcm_op *)data; |
ffd980f9 OH |
548 | struct bcm_msg_head msg_head; |
549 | ||
6e5c172c | 550 | /* create notification to user */ |
ffd980f9 OH |
551 | msg_head.opcode = RX_TIMEOUT; |
552 | msg_head.flags = op->flags; | |
553 | msg_head.count = op->count; | |
554 | msg_head.ival1 = op->ival1; | |
555 | msg_head.ival2 = op->ival2; | |
556 | msg_head.can_id = op->can_id; | |
557 | msg_head.nframes = 0; | |
558 | ||
559 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
6e5c172c OH |
560 | } |
561 | ||
562 | /* | |
069f8457 | 563 | * bcm_rx_timeout_handler - when the (cyclic) CAN frame reception timed out |
6e5c172c OH |
564 | */ |
565 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) | |
566 | { | |
567 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
568 | ||
569 | /* schedule before NET_RX_SOFTIRQ */ | |
570 | tasklet_hi_schedule(&op->tsklet); | |
ffd980f9 OH |
571 | |
572 | /* no restart of the timer is done here! */ | |
573 | ||
574 | /* if user wants to be informed, when cyclic CAN-Messages come back */ | |
575 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { | |
72c8a89a | 576 | /* clear received CAN frames to indicate 'nothing received' */ |
6f3b911d | 577 | memset(op->last_frames, 0, op->nframes * op->cfsiz); |
ffd980f9 | 578 | } |
73e87e02 OH |
579 | |
580 | return HRTIMER_NORESTART; | |
ffd980f9 OH |
581 | } |
582 | ||
6e5c172c OH |
583 | /* |
584 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush | |
585 | */ | |
5b75c497 OH |
586 | static inline int bcm_rx_do_flush(struct bcm_op *op, int update, |
587 | unsigned int index) | |
6e5c172c | 588 | { |
6f3b911d OH |
589 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; |
590 | ||
591 | if ((op->last_frames) && (lcf->flags & RX_THR)) { | |
6e5c172c | 592 | if (update) |
6f3b911d | 593 | bcm_rx_changed(op, lcf); |
6e5c172c OH |
594 | return 1; |
595 | } | |
596 | return 0; | |
597 | } | |
598 | ||
ffd980f9 | 599 | /* |
73e87e02 | 600 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
6e5c172c OH |
601 | * |
602 | * update == 0 : just check if throttled data is available (any irq context) | |
603 | * update == 1 : check and send throttled data to userspace (soft_irq context) | |
ffd980f9 | 604 | */ |
6e5c172c | 605 | static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
ffd980f9 | 606 | { |
73e87e02 | 607 | int updated = 0; |
ffd980f9 OH |
608 | |
609 | if (op->nframes > 1) { | |
5b75c497 | 610 | unsigned int i; |
73e87e02 | 611 | |
ffd980f9 | 612 | /* for MUX filter we start at index 1 */ |
6e5c172c OH |
613 | for (i = 1; i < op->nframes; i++) |
614 | updated += bcm_rx_do_flush(op, update, i); | |
ffd980f9 OH |
615 | |
616 | } else { | |
617 | /* for RX_FILTER_ID and simple filter */ | |
6e5c172c | 618 | updated += bcm_rx_do_flush(op, update, 0); |
ffd980f9 | 619 | } |
73e87e02 OH |
620 | |
621 | return updated; | |
622 | } | |
623 | ||
6e5c172c OH |
624 | static void bcm_rx_thr_tsklet(unsigned long data) |
625 | { | |
626 | struct bcm_op *op = (struct bcm_op *)data; | |
627 | ||
628 | /* push the changed data to the userspace */ | |
629 | bcm_rx_thr_flush(op, 1); | |
630 | } | |
631 | ||
73e87e02 OH |
632 | /* |
633 | * bcm_rx_thr_handler - the time for blocked content updates is over now: | |
634 | * Check for throttled data and send it to the userspace | |
635 | */ | |
636 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) | |
637 | { | |
638 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); | |
639 | ||
6e5c172c OH |
640 | tasklet_schedule(&op->thrtsklet); |
641 | ||
642 | if (bcm_rx_thr_flush(op, 0)) { | |
73e87e02 OH |
643 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
644 | return HRTIMER_RESTART; | |
645 | } else { | |
646 | /* rearm throttle handling */ | |
8b0e1953 | 647 | op->kt_lastmsg = 0; |
73e87e02 OH |
648 | return HRTIMER_NORESTART; |
649 | } | |
ffd980f9 OH |
650 | } |
651 | ||
652 | /* | |
069f8457 | 653 | * bcm_rx_handler - handle a CAN frame reception |
ffd980f9 OH |
654 | */ |
655 | static void bcm_rx_handler(struct sk_buff *skb, void *data) | |
656 | { | |
657 | struct bcm_op *op = (struct bcm_op *)data; | |
6f3b911d | 658 | const struct canfd_frame *rxframe = (struct canfd_frame *)skb->data; |
5b75c497 | 659 | unsigned int i; |
ffd980f9 | 660 | |
6e5c172c | 661 | if (op->can_id != rxframe->can_id) |
1fa17d4b | 662 | return; |
ffd980f9 | 663 | |
6f3b911d OH |
664 | /* make sure to handle the correct frame type (CAN / CAN FD) */ |
665 | if (skb->len != op->cfsiz) | |
666 | return; | |
667 | ||
668 | /* disable timeout */ | |
669 | hrtimer_cancel(&op->timer); | |
670 | ||
6e5c172c OH |
671 | /* save rx timestamp */ |
672 | op->rx_stamp = skb->tstamp; | |
673 | /* save originator for recvfrom() */ | |
674 | op->rx_ifindex = skb->dev->ifindex; | |
675 | /* update statistics */ | |
676 | op->frames_abs++; | |
ffd980f9 OH |
677 | |
678 | if (op->flags & RX_RTR_FRAME) { | |
679 | /* send reply for RTR-request (placed in op->frames[0]) */ | |
680 | bcm_can_tx(op); | |
1fa17d4b | 681 | return; |
ffd980f9 OH |
682 | } |
683 | ||
684 | if (op->flags & RX_FILTER_ID) { | |
685 | /* the easiest case */ | |
5499a6b2 | 686 | bcm_rx_update_and_send(op, op->last_frames, rxframe); |
1fa17d4b | 687 | goto rx_starttimer; |
ffd980f9 OH |
688 | } |
689 | ||
690 | if (op->nframes == 1) { | |
691 | /* simple compare with index 0 */ | |
6e5c172c | 692 | bcm_rx_cmp_to_index(op, 0, rxframe); |
1fa17d4b | 693 | goto rx_starttimer; |
ffd980f9 OH |
694 | } |
695 | ||
696 | if (op->nframes > 1) { | |
697 | /* | |
698 | * multiplex compare | |
699 | * | |
700 | * find the first multiplex mask that fits. | |
6f3b911d OH |
701 | * Remark: The MUX-mask is stored in index 0 - but only the |
702 | * first 64 bits of the frame data[] are relevant (CAN FD) | |
ffd980f9 OH |
703 | */ |
704 | ||
705 | for (i = 1; i < op->nframes; i++) { | |
6f3b911d OH |
706 | if ((get_u64(op->frames, 0) & get_u64(rxframe, 0)) == |
707 | (get_u64(op->frames, 0) & | |
708 | get_u64(op->frames + op->cfsiz * i, 0))) { | |
6e5c172c | 709 | bcm_rx_cmp_to_index(op, i, rxframe); |
ffd980f9 OH |
710 | break; |
711 | } | |
712 | } | |
ffd980f9 | 713 | } |
6e5c172c | 714 | |
1fa17d4b | 715 | rx_starttimer: |
6e5c172c | 716 | bcm_rx_starttimer(op); |
ffd980f9 OH |
717 | } |
718 | ||
719 | /* | |
720 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements | |
721 | */ | |
2b5f5f5d OH |
722 | static struct bcm_op *bcm_find_op(struct list_head *ops, |
723 | struct bcm_msg_head *mh, int ifindex) | |
ffd980f9 OH |
724 | { |
725 | struct bcm_op *op; | |
726 | ||
727 | list_for_each_entry(op, ops, list) { | |
6f3b911d OH |
728 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
729 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) | |
ffd980f9 OH |
730 | return op; |
731 | } | |
732 | ||
733 | return NULL; | |
734 | } | |
735 | ||
736 | static void bcm_remove_op(struct bcm_op *op) | |
737 | { | |
a06393ed OH |
738 | if (op->tsklet.func) { |
739 | while (test_bit(TASKLET_STATE_SCHED, &op->tsklet.state) || | |
740 | test_bit(TASKLET_STATE_RUN, &op->tsklet.state) || | |
741 | hrtimer_active(&op->timer)) { | |
742 | hrtimer_cancel(&op->timer); | |
743 | tasklet_kill(&op->tsklet); | |
744 | } | |
745 | } | |
6e5c172c | 746 | |
a06393ed OH |
747 | if (op->thrtsklet.func) { |
748 | while (test_bit(TASKLET_STATE_SCHED, &op->thrtsklet.state) || | |
749 | test_bit(TASKLET_STATE_RUN, &op->thrtsklet.state) || | |
750 | hrtimer_active(&op->thrtimer)) { | |
751 | hrtimer_cancel(&op->thrtimer); | |
752 | tasklet_kill(&op->thrtsklet); | |
753 | } | |
754 | } | |
6e5c172c | 755 | |
ffd980f9 OH |
756 | if ((op->frames) && (op->frames != &op->sframe)) |
757 | kfree(op->frames); | |
758 | ||
759 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) | |
760 | kfree(op->last_frames); | |
761 | ||
762 | kfree(op); | |
ffd980f9 OH |
763 | } |
764 | ||
765 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) | |
766 | { | |
767 | if (op->rx_reg_dev == dev) { | |
384317ef | 768 | can_rx_unregister(dev_net(dev), dev, op->can_id, |
8e8cda6d | 769 | REGMASK(op->can_id), bcm_rx_handler, op); |
ffd980f9 OH |
770 | |
771 | /* mark as removed subscription */ | |
772 | op->rx_reg_dev = NULL; | |
773 | } else | |
774 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " | |
775 | "mismatch %p %p\n", op->rx_reg_dev, dev); | |
776 | } | |
777 | ||
778 | /* | |
779 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) | |
780 | */ | |
2b5f5f5d OH |
781 | static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh, |
782 | int ifindex) | |
ffd980f9 OH |
783 | { |
784 | struct bcm_op *op, *n; | |
785 | ||
786 | list_for_each_entry_safe(op, n, ops, list) { | |
6f3b911d OH |
787 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
788 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { | |
ffd980f9 OH |
789 | |
790 | /* | |
791 | * Don't care if we're bound or not (due to netdev | |
792 | * problems) can_rx_unregister() is always a save | |
793 | * thing to do here. | |
794 | */ | |
795 | if (op->ifindex) { | |
796 | /* | |
797 | * Only remove subscriptions that had not | |
798 | * been removed due to NETDEV_UNREGISTER | |
799 | * in bcm_notifier() | |
800 | */ | |
801 | if (op->rx_reg_dev) { | |
802 | struct net_device *dev; | |
803 | ||
384317ef | 804 | dev = dev_get_by_index(sock_net(op->sk), |
ffd980f9 OH |
805 | op->ifindex); |
806 | if (dev) { | |
807 | bcm_rx_unreg(dev, op); | |
808 | dev_put(dev); | |
809 | } | |
810 | } | |
811 | } else | |
384317ef OH |
812 | can_rx_unregister(sock_net(op->sk), NULL, |
813 | op->can_id, | |
ffd980f9 OH |
814 | REGMASK(op->can_id), |
815 | bcm_rx_handler, op); | |
816 | ||
817 | list_del(&op->list); | |
818 | bcm_remove_op(op); | |
819 | return 1; /* done */ | |
820 | } | |
821 | } | |
822 | ||
823 | return 0; /* not found */ | |
824 | } | |
825 | ||
826 | /* | |
827 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) | |
828 | */ | |
2b5f5f5d OH |
829 | static int bcm_delete_tx_op(struct list_head *ops, struct bcm_msg_head *mh, |
830 | int ifindex) | |
ffd980f9 OH |
831 | { |
832 | struct bcm_op *op, *n; | |
833 | ||
834 | list_for_each_entry_safe(op, n, ops, list) { | |
6f3b911d OH |
835 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
836 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { | |
ffd980f9 OH |
837 | list_del(&op->list); |
838 | bcm_remove_op(op); | |
839 | return 1; /* done */ | |
840 | } | |
841 | } | |
842 | ||
843 | return 0; /* not found */ | |
844 | } | |
845 | ||
846 | /* | |
847 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) | |
848 | */ | |
849 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, | |
850 | int ifindex) | |
851 | { | |
2b5f5f5d | 852 | struct bcm_op *op = bcm_find_op(ops, msg_head, ifindex); |
ffd980f9 OH |
853 | |
854 | if (!op) | |
855 | return -EINVAL; | |
856 | ||
857 | /* put current values into msg_head */ | |
858 | msg_head->flags = op->flags; | |
859 | msg_head->count = op->count; | |
860 | msg_head->ival1 = op->ival1; | |
861 | msg_head->ival2 = op->ival2; | |
862 | msg_head->nframes = op->nframes; | |
863 | ||
864 | bcm_send_to_user(op, msg_head, op->frames, 0); | |
865 | ||
866 | return MHSIZ; | |
867 | } | |
868 | ||
869 | /* | |
870 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) | |
871 | */ | |
872 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
873 | int ifindex, struct sock *sk) | |
874 | { | |
875 | struct bcm_sock *bo = bcm_sk(sk); | |
876 | struct bcm_op *op; | |
6f3b911d | 877 | struct canfd_frame *cf; |
5b75c497 OH |
878 | unsigned int i; |
879 | int err; | |
ffd980f9 OH |
880 | |
881 | /* we need a real device to send frames */ | |
882 | if (!ifindex) | |
883 | return -ENODEV; | |
884 | ||
72c8a89a | 885 | /* check nframes boundaries - we need at least one CAN frame */ |
5b75c497 | 886 | if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) |
ffd980f9 OH |
887 | return -EINVAL; |
888 | ||
889 | /* check the given can_id */ | |
2b5f5f5d | 890 | op = bcm_find_op(&bo->tx_ops, msg_head, ifindex); |
ffd980f9 OH |
891 | if (op) { |
892 | /* update existing BCM operation */ | |
893 | ||
894 | /* | |
72c8a89a | 895 | * Do we need more space for the CAN frames than currently |
ffd980f9 OH |
896 | * allocated? -> This is a _really_ unusual use-case and |
897 | * therefore (complexity / locking) it is not supported. | |
898 | */ | |
899 | if (msg_head->nframes > op->nframes) | |
900 | return -E2BIG; | |
901 | ||
72c8a89a | 902 | /* update CAN frames content */ |
ffd980f9 | 903 | for (i = 0; i < msg_head->nframes; i++) { |
7f2d38eb | 904 | |
6f3b911d OH |
905 | cf = op->frames + op->cfsiz * i; |
906 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); | |
907 | ||
908 | if (op->flags & CAN_FD_FRAME) { | |
909 | if (cf->len > 64) | |
910 | err = -EINVAL; | |
911 | } else { | |
912 | if (cf->len > 8) | |
913 | err = -EINVAL; | |
914 | } | |
7f2d38eb | 915 | |
ffd980f9 OH |
916 | if (err < 0) |
917 | return err; | |
918 | ||
919 | if (msg_head->flags & TX_CP_CAN_ID) { | |
920 | /* copy can_id into frame */ | |
6f3b911d | 921 | cf->can_id = msg_head->can_id; |
ffd980f9 OH |
922 | } |
923 | } | |
6f3b911d | 924 | op->flags = msg_head->flags; |
ffd980f9 OH |
925 | |
926 | } else { | |
927 | /* insert new BCM operation for the given can_id */ | |
928 | ||
929 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
930 | if (!op) | |
931 | return -ENOMEM; | |
932 | ||
6f3b911d OH |
933 | op->can_id = msg_head->can_id; |
934 | op->cfsiz = CFSIZ(msg_head->flags); | |
935 | op->flags = msg_head->flags; | |
ffd980f9 | 936 | |
72c8a89a | 937 | /* create array for CAN frames and copy the data */ |
ffd980f9 | 938 | if (msg_head->nframes > 1) { |
6f3b911d | 939 | op->frames = kmalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
940 | GFP_KERNEL); |
941 | if (!op->frames) { | |
942 | kfree(op); | |
943 | return -ENOMEM; | |
944 | } | |
945 | } else | |
946 | op->frames = &op->sframe; | |
947 | ||
948 | for (i = 0; i < msg_head->nframes; i++) { | |
7f2d38eb | 949 | |
6f3b911d OH |
950 | cf = op->frames + op->cfsiz * i; |
951 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); | |
952 | ||
953 | if (op->flags & CAN_FD_FRAME) { | |
954 | if (cf->len > 64) | |
955 | err = -EINVAL; | |
956 | } else { | |
957 | if (cf->len > 8) | |
958 | err = -EINVAL; | |
959 | } | |
7f2d38eb | 960 | |
ffd980f9 OH |
961 | if (err < 0) { |
962 | if (op->frames != &op->sframe) | |
963 | kfree(op->frames); | |
964 | kfree(op); | |
965 | return err; | |
966 | } | |
967 | ||
968 | if (msg_head->flags & TX_CP_CAN_ID) { | |
969 | /* copy can_id into frame */ | |
6f3b911d | 970 | cf->can_id = msg_head->can_id; |
ffd980f9 OH |
971 | } |
972 | } | |
973 | ||
974 | /* tx_ops never compare with previous received messages */ | |
975 | op->last_frames = NULL; | |
976 | ||
977 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
978 | op->sk = sk; | |
979 | op->ifindex = ifindex; | |
980 | ||
981 | /* initialize uninitialized (kzalloc) structure */ | |
73e87e02 OH |
982 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
983 | op->timer.function = bcm_tx_timeout_handler; | |
ffd980f9 | 984 | |
6e5c172c OH |
985 | /* initialize tasklet for tx countevent notification */ |
986 | tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, | |
987 | (unsigned long) op); | |
988 | ||
ffd980f9 | 989 | /* currently unused in tx_ops */ |
73e87e02 | 990 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
ffd980f9 OH |
991 | |
992 | /* add this bcm_op to the list of the tx_ops */ | |
993 | list_add(&op->list, &bo->tx_ops); | |
994 | ||
995 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ | |
996 | ||
997 | if (op->nframes != msg_head->nframes) { | |
998 | op->nframes = msg_head->nframes; | |
999 | /* start multiple frame transmission with index 0 */ | |
1000 | op->currframe = 0; | |
1001 | } | |
1002 | ||
1003 | /* check flags */ | |
1004 | ||
ffd980f9 OH |
1005 | if (op->flags & TX_RESET_MULTI_IDX) { |
1006 | /* start multiple frame transmission with index 0 */ | |
1007 | op->currframe = 0; | |
1008 | } | |
1009 | ||
1010 | if (op->flags & SETTIMER) { | |
1011 | /* set timer values */ | |
1012 | op->count = msg_head->count; | |
1013 | op->ival1 = msg_head->ival1; | |
1014 | op->ival2 = msg_head->ival2; | |
ba61a8d9 AB |
1015 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
1016 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1017 | |
1018 | /* disable an active timer due to zero values? */ | |
2456e855 | 1019 | if (!op->kt_ival1 && !op->kt_ival2) |
73e87e02 | 1020 | hrtimer_cancel(&op->timer); |
ffd980f9 OH |
1021 | } |
1022 | ||
12d0d0d3 OH |
1023 | if (op->flags & STARTTIMER) { |
1024 | hrtimer_cancel(&op->timer); | |
72c8a89a | 1025 | /* spec: send CAN frame when starting timer */ |
ffd980f9 | 1026 | op->flags |= TX_ANNOUNCE; |
ffd980f9 OH |
1027 | } |
1028 | ||
aabdcb0b | 1029 | if (op->flags & TX_ANNOUNCE) { |
ffd980f9 | 1030 | bcm_can_tx(op); |
12d0d0d3 | 1031 | if (op->count) |
aabdcb0b OH |
1032 | op->count--; |
1033 | } | |
ffd980f9 | 1034 | |
12d0d0d3 OH |
1035 | if (op->flags & STARTTIMER) |
1036 | bcm_tx_start_timer(op); | |
1037 | ||
6f3b911d | 1038 | return msg_head->nframes * op->cfsiz + MHSIZ; |
ffd980f9 OH |
1039 | } |
1040 | ||
1041 | /* | |
1042 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) | |
1043 | */ | |
1044 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
1045 | int ifindex, struct sock *sk) | |
1046 | { | |
1047 | struct bcm_sock *bo = bcm_sk(sk); | |
1048 | struct bcm_op *op; | |
1049 | int do_rx_register; | |
1050 | int err = 0; | |
1051 | ||
1052 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { | |
1053 | /* be robust against wrong usage ... */ | |
1054 | msg_head->flags |= RX_FILTER_ID; | |
1055 | /* ignore trailing garbage */ | |
1056 | msg_head->nframes = 0; | |
1057 | } | |
1058 | ||
5b75c497 OH |
1059 | /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ |
1060 | if (msg_head->nframes > MAX_NFRAMES + 1) | |
1061 | return -EINVAL; | |
1062 | ||
ffd980f9 OH |
1063 | if ((msg_head->flags & RX_RTR_FRAME) && |
1064 | ((msg_head->nframes != 1) || | |
1065 | (!(msg_head->can_id & CAN_RTR_FLAG)))) | |
1066 | return -EINVAL; | |
1067 | ||
1068 | /* check the given can_id */ | |
2b5f5f5d | 1069 | op = bcm_find_op(&bo->rx_ops, msg_head, ifindex); |
ffd980f9 OH |
1070 | if (op) { |
1071 | /* update existing BCM operation */ | |
1072 | ||
1073 | /* | |
72c8a89a | 1074 | * Do we need more space for the CAN frames than currently |
ffd980f9 OH |
1075 | * allocated? -> This is a _really_ unusual use-case and |
1076 | * therefore (complexity / locking) it is not supported. | |
1077 | */ | |
1078 | if (msg_head->nframes > op->nframes) | |
1079 | return -E2BIG; | |
1080 | ||
1081 | if (msg_head->nframes) { | |
72c8a89a | 1082 | /* update CAN frames content */ |
5499a6b2 | 1083 | err = memcpy_from_msg(op->frames, msg, |
6f3b911d | 1084 | msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1085 | if (err < 0) |
1086 | return err; | |
1087 | ||
1088 | /* clear last_frames to indicate 'nothing received' */ | |
6f3b911d | 1089 | memset(op->last_frames, 0, msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1090 | } |
1091 | ||
1092 | op->nframes = msg_head->nframes; | |
6f3b911d | 1093 | op->flags = msg_head->flags; |
ffd980f9 OH |
1094 | |
1095 | /* Only an update -> do not call can_rx_register() */ | |
1096 | do_rx_register = 0; | |
1097 | ||
1098 | } else { | |
1099 | /* insert new BCM operation for the given can_id */ | |
1100 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
1101 | if (!op) | |
1102 | return -ENOMEM; | |
1103 | ||
6f3b911d OH |
1104 | op->can_id = msg_head->can_id; |
1105 | op->nframes = msg_head->nframes; | |
1106 | op->cfsiz = CFSIZ(msg_head->flags); | |
1107 | op->flags = msg_head->flags; | |
ffd980f9 OH |
1108 | |
1109 | if (msg_head->nframes > 1) { | |
72c8a89a | 1110 | /* create array for CAN frames and copy the data */ |
6f3b911d | 1111 | op->frames = kmalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
1112 | GFP_KERNEL); |
1113 | if (!op->frames) { | |
1114 | kfree(op); | |
1115 | return -ENOMEM; | |
1116 | } | |
1117 | ||
72c8a89a | 1118 | /* create and init array for received CAN frames */ |
6f3b911d | 1119 | op->last_frames = kzalloc(msg_head->nframes * op->cfsiz, |
ffd980f9 OH |
1120 | GFP_KERNEL); |
1121 | if (!op->last_frames) { | |
1122 | kfree(op->frames); | |
1123 | kfree(op); | |
1124 | return -ENOMEM; | |
1125 | } | |
1126 | ||
1127 | } else { | |
1128 | op->frames = &op->sframe; | |
1129 | op->last_frames = &op->last_sframe; | |
1130 | } | |
1131 | ||
1132 | if (msg_head->nframes) { | |
5499a6b2 | 1133 | err = memcpy_from_msg(op->frames, msg, |
6f3b911d | 1134 | msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1135 | if (err < 0) { |
1136 | if (op->frames != &op->sframe) | |
1137 | kfree(op->frames); | |
1138 | if (op->last_frames != &op->last_sframe) | |
1139 | kfree(op->last_frames); | |
1140 | kfree(op); | |
1141 | return err; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
1146 | op->sk = sk; | |
1147 | op->ifindex = ifindex; | |
1148 | ||
81b40110 OH |
1149 | /* ifindex for timeout events w/o previous frame reception */ |
1150 | op->rx_ifindex = ifindex; | |
1151 | ||
ffd980f9 | 1152 | /* initialize uninitialized (kzalloc) structure */ |
73e87e02 OH |
1153 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1154 | op->timer.function = bcm_rx_timeout_handler; | |
ffd980f9 | 1155 | |
6e5c172c OH |
1156 | /* initialize tasklet for rx timeout notification */ |
1157 | tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, | |
1158 | (unsigned long) op); | |
1159 | ||
73e87e02 OH |
1160 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1161 | op->thrtimer.function = bcm_rx_thr_handler; | |
ffd980f9 | 1162 | |
6e5c172c OH |
1163 | /* initialize tasklet for rx throttle handling */ |
1164 | tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, | |
1165 | (unsigned long) op); | |
1166 | ||
ffd980f9 OH |
1167 | /* add this bcm_op to the list of the rx_ops */ |
1168 | list_add(&op->list, &bo->rx_ops); | |
1169 | ||
1170 | /* call can_rx_register() */ | |
1171 | do_rx_register = 1; | |
1172 | ||
1173 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ | |
1174 | ||
1175 | /* check flags */ | |
ffd980f9 OH |
1176 | |
1177 | if (op->flags & RX_RTR_FRAME) { | |
5499a6b2 | 1178 | struct canfd_frame *frame0 = op->frames; |
ffd980f9 OH |
1179 | |
1180 | /* no timers in RTR-mode */ | |
73e87e02 OH |
1181 | hrtimer_cancel(&op->thrtimer); |
1182 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1183 | |
1184 | /* | |
1185 | * funny feature in RX(!)_SETUP only for RTR-mode: | |
1186 | * copy can_id into frame BUT without RTR-flag to | |
1187 | * prevent a full-load-loopback-test ... ;-] | |
1188 | */ | |
1189 | if ((op->flags & TX_CP_CAN_ID) || | |
5499a6b2 OH |
1190 | (frame0->can_id == op->can_id)) |
1191 | frame0->can_id = op->can_id & ~CAN_RTR_FLAG; | |
ffd980f9 OH |
1192 | |
1193 | } else { | |
1194 | if (op->flags & SETTIMER) { | |
1195 | ||
1196 | /* set timer value */ | |
1197 | op->ival1 = msg_head->ival1; | |
1198 | op->ival2 = msg_head->ival2; | |
ba61a8d9 AB |
1199 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
1200 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1201 | |
1202 | /* disable an active timer due to zero value? */ | |
2456e855 | 1203 | if (!op->kt_ival1) |
73e87e02 | 1204 | hrtimer_cancel(&op->timer); |
ffd980f9 OH |
1205 | |
1206 | /* | |
73e87e02 OH |
1207 | * In any case cancel the throttle timer, flush |
1208 | * potentially blocked msgs and reset throttle handling | |
ffd980f9 | 1209 | */ |
8b0e1953 | 1210 | op->kt_lastmsg = 0; |
73e87e02 | 1211 | hrtimer_cancel(&op->thrtimer); |
6e5c172c | 1212 | bcm_rx_thr_flush(op, 1); |
ffd980f9 OH |
1213 | } |
1214 | ||
2456e855 | 1215 | if ((op->flags & STARTTIMER) && op->kt_ival1) |
73e87e02 OH |
1216 | hrtimer_start(&op->timer, op->kt_ival1, |
1217 | HRTIMER_MODE_REL); | |
ffd980f9 OH |
1218 | } |
1219 | ||
1220 | /* now we can register for can_ids, if we added a new bcm_op */ | |
1221 | if (do_rx_register) { | |
1222 | if (ifindex) { | |
1223 | struct net_device *dev; | |
1224 | ||
384317ef | 1225 | dev = dev_get_by_index(sock_net(sk), ifindex); |
ffd980f9 | 1226 | if (dev) { |
384317ef | 1227 | err = can_rx_register(sock_net(sk), dev, |
8e8cda6d | 1228 | op->can_id, |
ffd980f9 OH |
1229 | REGMASK(op->can_id), |
1230 | bcm_rx_handler, op, | |
f1712c73 | 1231 | "bcm", sk); |
ffd980f9 OH |
1232 | |
1233 | op->rx_reg_dev = dev; | |
1234 | dev_put(dev); | |
1235 | } | |
1236 | ||
1237 | } else | |
384317ef | 1238 | err = can_rx_register(sock_net(sk), NULL, op->can_id, |
ffd980f9 | 1239 | REGMASK(op->can_id), |
f1712c73 | 1240 | bcm_rx_handler, op, "bcm", sk); |
ffd980f9 OH |
1241 | if (err) { |
1242 | /* this bcm rx op is broken -> remove it */ | |
1243 | list_del(&op->list); | |
1244 | bcm_remove_op(op); | |
1245 | return err; | |
1246 | } | |
1247 | } | |
1248 | ||
6f3b911d | 1249 | return msg_head->nframes * op->cfsiz + MHSIZ; |
ffd980f9 OH |
1250 | } |
1251 | ||
1252 | /* | |
1253 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) | |
1254 | */ | |
2b5f5f5d OH |
1255 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk, |
1256 | int cfsiz) | |
ffd980f9 OH |
1257 | { |
1258 | struct sk_buff *skb; | |
1259 | struct net_device *dev; | |
1260 | int err; | |
1261 | ||
1262 | /* we need a real device to send frames */ | |
1263 | if (!ifindex) | |
1264 | return -ENODEV; | |
1265 | ||
2b5f5f5d | 1266 | skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL); |
ffd980f9 OH |
1267 | if (!skb) |
1268 | return -ENOMEM; | |
1269 | ||
2bf3440d | 1270 | can_skb_reserve(skb); |
156c2bb9 | 1271 | |
2b5f5f5d | 1272 | err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz); |
ffd980f9 OH |
1273 | if (err < 0) { |
1274 | kfree_skb(skb); | |
1275 | return err; | |
1276 | } | |
1277 | ||
384317ef | 1278 | dev = dev_get_by_index(sock_net(sk), ifindex); |
ffd980f9 OH |
1279 | if (!dev) { |
1280 | kfree_skb(skb); | |
1281 | return -ENODEV; | |
1282 | } | |
1283 | ||
2bf3440d | 1284 | can_skb_prv(skb)->ifindex = dev->ifindex; |
d3b58c47 | 1285 | can_skb_prv(skb)->skbcnt = 0; |
ffd980f9 | 1286 | skb->dev = dev; |
0ae89beb | 1287 | can_skb_set_owner(skb, sk); |
7f2d38eb | 1288 | err = can_send(skb, 1); /* send with loopback */ |
ffd980f9 OH |
1289 | dev_put(dev); |
1290 | ||
7f2d38eb OH |
1291 | if (err) |
1292 | return err; | |
1293 | ||
2b5f5f5d | 1294 | return cfsiz + MHSIZ; |
ffd980f9 OH |
1295 | } |
1296 | ||
1297 | /* | |
1298 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace | |
1299 | */ | |
1b784140 | 1300 | static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
ffd980f9 OH |
1301 | { |
1302 | struct sock *sk = sock->sk; | |
1303 | struct bcm_sock *bo = bcm_sk(sk); | |
1304 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ | |
1305 | struct bcm_msg_head msg_head; | |
6f3b911d | 1306 | int cfsiz; |
ffd980f9 OH |
1307 | int ret; /* read bytes or error codes as return value */ |
1308 | ||
1309 | if (!bo->bound) | |
1310 | return -ENOTCONN; | |
1311 | ||
7f2d38eb | 1312 | /* check for valid message length from userspace */ |
2b5f5f5d OH |
1313 | if (size < MHSIZ) |
1314 | return -EINVAL; | |
1315 | ||
1316 | /* read message head information */ | |
1317 | ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ); | |
1318 | if (ret < 0) | |
1319 | return ret; | |
1320 | ||
6f3b911d OH |
1321 | cfsiz = CFSIZ(msg_head.flags); |
1322 | if ((size - MHSIZ) % cfsiz) | |
7f2d38eb OH |
1323 | return -EINVAL; |
1324 | ||
ffd980f9 OH |
1325 | /* check for alternative ifindex for this bcm_op */ |
1326 | ||
1327 | if (!ifindex && msg->msg_name) { | |
1328 | /* no bound device as default => check msg_name */ | |
342dfc30 | 1329 | DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); |
ffd980f9 | 1330 | |
5e507328 KVD |
1331 | if (msg->msg_namelen < sizeof(*addr)) |
1332 | return -EINVAL; | |
1333 | ||
ffd980f9 OH |
1334 | if (addr->can_family != AF_CAN) |
1335 | return -EINVAL; | |
1336 | ||
1337 | /* ifindex from sendto() */ | |
1338 | ifindex = addr->can_ifindex; | |
1339 | ||
1340 | if (ifindex) { | |
1341 | struct net_device *dev; | |
1342 | ||
384317ef | 1343 | dev = dev_get_by_index(sock_net(sk), ifindex); |
ffd980f9 OH |
1344 | if (!dev) |
1345 | return -ENODEV; | |
1346 | ||
1347 | if (dev->type != ARPHRD_CAN) { | |
1348 | dev_put(dev); | |
1349 | return -ENODEV; | |
1350 | } | |
1351 | ||
1352 | dev_put(dev); | |
1353 | } | |
1354 | } | |
1355 | ||
ffd980f9 OH |
1356 | lock_sock(sk); |
1357 | ||
1358 | switch (msg_head.opcode) { | |
1359 | ||
1360 | case TX_SETUP: | |
1361 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); | |
1362 | break; | |
1363 | ||
1364 | case RX_SETUP: | |
1365 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); | |
1366 | break; | |
1367 | ||
1368 | case TX_DELETE: | |
2b5f5f5d | 1369 | if (bcm_delete_tx_op(&bo->tx_ops, &msg_head, ifindex)) |
ffd980f9 OH |
1370 | ret = MHSIZ; |
1371 | else | |
1372 | ret = -EINVAL; | |
1373 | break; | |
1374 | ||
1375 | case RX_DELETE: | |
2b5f5f5d | 1376 | if (bcm_delete_rx_op(&bo->rx_ops, &msg_head, ifindex)) |
ffd980f9 OH |
1377 | ret = MHSIZ; |
1378 | else | |
1379 | ret = -EINVAL; | |
1380 | break; | |
1381 | ||
1382 | case TX_READ: | |
1383 | /* reuse msg_head for the reply to TX_READ */ | |
1384 | msg_head.opcode = TX_STATUS; | |
1385 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); | |
1386 | break; | |
1387 | ||
1388 | case RX_READ: | |
1389 | /* reuse msg_head for the reply to RX_READ */ | |
1390 | msg_head.opcode = RX_STATUS; | |
1391 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); | |
1392 | break; | |
1393 | ||
1394 | case TX_SEND: | |
72c8a89a | 1395 | /* we need exactly one CAN frame behind the msg head */ |
6f3b911d | 1396 | if ((msg_head.nframes != 1) || (size != cfsiz + MHSIZ)) |
ffd980f9 OH |
1397 | ret = -EINVAL; |
1398 | else | |
6f3b911d | 1399 | ret = bcm_tx_send(msg, ifindex, sk, cfsiz); |
ffd980f9 OH |
1400 | break; |
1401 | ||
1402 | default: | |
1403 | ret = -EINVAL; | |
1404 | break; | |
1405 | } | |
1406 | ||
1407 | release_sock(sk); | |
1408 | ||
1409 | return ret; | |
1410 | } | |
1411 | ||
1412 | /* | |
1413 | * notification handler for netdevice status changes | |
1414 | */ | |
1415 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, | |
351638e7 | 1416 | void *ptr) |
ffd980f9 | 1417 | { |
351638e7 | 1418 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
ffd980f9 OH |
1419 | struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); |
1420 | struct sock *sk = &bo->sk; | |
1421 | struct bcm_op *op; | |
1422 | int notify_enodev = 0; | |
1423 | ||
384317ef | 1424 | if (!net_eq(dev_net(dev), sock_net(sk))) |
ffd980f9 OH |
1425 | return NOTIFY_DONE; |
1426 | ||
1427 | if (dev->type != ARPHRD_CAN) | |
1428 | return NOTIFY_DONE; | |
1429 | ||
1430 | switch (msg) { | |
1431 | ||
1432 | case NETDEV_UNREGISTER: | |
1433 | lock_sock(sk); | |
1434 | ||
1435 | /* remove device specific receive entries */ | |
1436 | list_for_each_entry(op, &bo->rx_ops, list) | |
1437 | if (op->rx_reg_dev == dev) | |
1438 | bcm_rx_unreg(dev, op); | |
1439 | ||
1440 | /* remove device reference, if this is our bound device */ | |
1441 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1442 | bo->bound = 0; | |
1443 | bo->ifindex = 0; | |
1444 | notify_enodev = 1; | |
1445 | } | |
1446 | ||
1447 | release_sock(sk); | |
1448 | ||
1449 | if (notify_enodev) { | |
1450 | sk->sk_err = ENODEV; | |
1451 | if (!sock_flag(sk, SOCK_DEAD)) | |
1452 | sk->sk_error_report(sk); | |
1453 | } | |
1454 | break; | |
1455 | ||
1456 | case NETDEV_DOWN: | |
1457 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1458 | sk->sk_err = ENETDOWN; | |
1459 | if (!sock_flag(sk, SOCK_DEAD)) | |
1460 | sk->sk_error_report(sk); | |
1461 | } | |
1462 | } | |
1463 | ||
1464 | return NOTIFY_DONE; | |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * initial settings for all BCM sockets to be set at socket creation time | |
1469 | */ | |
1470 | static int bcm_init(struct sock *sk) | |
1471 | { | |
1472 | struct bcm_sock *bo = bcm_sk(sk); | |
1473 | ||
1474 | bo->bound = 0; | |
1475 | bo->ifindex = 0; | |
1476 | bo->dropped_usr_msgs = 0; | |
1477 | bo->bcm_proc_read = NULL; | |
1478 | ||
1479 | INIT_LIST_HEAD(&bo->tx_ops); | |
1480 | INIT_LIST_HEAD(&bo->rx_ops); | |
1481 | ||
1482 | /* set notifier */ | |
1483 | bo->notifier.notifier_call = bcm_notifier; | |
1484 | ||
1485 | register_netdevice_notifier(&bo->notifier); | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * standard socket functions | |
1492 | */ | |
1493 | static int bcm_release(struct socket *sock) | |
1494 | { | |
1495 | struct sock *sk = sock->sk; | |
384317ef | 1496 | struct net *net = sock_net(sk); |
c6914a6f | 1497 | struct bcm_sock *bo; |
ffd980f9 OH |
1498 | struct bcm_op *op, *next; |
1499 | ||
c6914a6f DJ |
1500 | if (sk == NULL) |
1501 | return 0; | |
1502 | ||
1503 | bo = bcm_sk(sk); | |
1504 | ||
ffd980f9 OH |
1505 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
1506 | ||
1507 | unregister_netdevice_notifier(&bo->notifier); | |
1508 | ||
1509 | lock_sock(sk); | |
1510 | ||
1511 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) | |
1512 | bcm_remove_op(op); | |
1513 | ||
1514 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { | |
1515 | /* | |
1516 | * Don't care if we're bound or not (due to netdev problems) | |
1517 | * can_rx_unregister() is always a save thing to do here. | |
1518 | */ | |
1519 | if (op->ifindex) { | |
1520 | /* | |
1521 | * Only remove subscriptions that had not | |
1522 | * been removed due to NETDEV_UNREGISTER | |
1523 | * in bcm_notifier() | |
1524 | */ | |
1525 | if (op->rx_reg_dev) { | |
1526 | struct net_device *dev; | |
1527 | ||
384317ef | 1528 | dev = dev_get_by_index(net, op->ifindex); |
ffd980f9 OH |
1529 | if (dev) { |
1530 | bcm_rx_unreg(dev, op); | |
1531 | dev_put(dev); | |
1532 | } | |
1533 | } | |
1534 | } else | |
384317ef | 1535 | can_rx_unregister(net, NULL, op->can_id, |
ffd980f9 OH |
1536 | REGMASK(op->can_id), |
1537 | bcm_rx_handler, op); | |
1538 | ||
1539 | bcm_remove_op(op); | |
1540 | } | |
1541 | ||
c2701b37 | 1542 | #if IS_ENABLED(CONFIG_PROC_FS) |
ffd980f9 | 1543 | /* remove procfs entry */ |
384317ef OH |
1544 | if (net->can.bcmproc_dir && bo->bcm_proc_read) |
1545 | remove_proc_entry(bo->procname, net->can.bcmproc_dir); | |
c2701b37 | 1546 | #endif /* CONFIG_PROC_FS */ |
ffd980f9 OH |
1547 | |
1548 | /* remove device reference */ | |
1549 | if (bo->bound) { | |
1550 | bo->bound = 0; | |
1551 | bo->ifindex = 0; | |
1552 | } | |
1553 | ||
f7e5cc0c LW |
1554 | sock_orphan(sk); |
1555 | sock->sk = NULL; | |
1556 | ||
ffd980f9 OH |
1557 | release_sock(sk); |
1558 | sock_put(sk); | |
1559 | ||
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, | |
1564 | int flags) | |
1565 | { | |
1566 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1567 | struct sock *sk = sock->sk; | |
1568 | struct bcm_sock *bo = bcm_sk(sk); | |
384317ef | 1569 | struct net *net = sock_net(sk); |
deb507f9 | 1570 | int ret = 0; |
ffd980f9 | 1571 | |
6503d961 CG |
1572 | if (len < sizeof(*addr)) |
1573 | return -EINVAL; | |
1574 | ||
deb507f9 OH |
1575 | lock_sock(sk); |
1576 | ||
1577 | if (bo->bound) { | |
1578 | ret = -EISCONN; | |
1579 | goto fail; | |
1580 | } | |
ffd980f9 OH |
1581 | |
1582 | /* bind a device to this socket */ | |
1583 | if (addr->can_ifindex) { | |
1584 | struct net_device *dev; | |
1585 | ||
384317ef | 1586 | dev = dev_get_by_index(net, addr->can_ifindex); |
deb507f9 OH |
1587 | if (!dev) { |
1588 | ret = -ENODEV; | |
1589 | goto fail; | |
1590 | } | |
ffd980f9 OH |
1591 | if (dev->type != ARPHRD_CAN) { |
1592 | dev_put(dev); | |
deb507f9 OH |
1593 | ret = -ENODEV; |
1594 | goto fail; | |
ffd980f9 OH |
1595 | } |
1596 | ||
1597 | bo->ifindex = dev->ifindex; | |
1598 | dev_put(dev); | |
1599 | ||
1600 | } else { | |
1601 | /* no interface reference for ifindex = 0 ('any' CAN device) */ | |
1602 | bo->ifindex = 0; | |
1603 | } | |
1604 | ||
c2701b37 | 1605 | #if IS_ENABLED(CONFIG_PROC_FS) |
384317ef | 1606 | if (net->can.bcmproc_dir) { |
ffd980f9 | 1607 | /* unique socket address as filename */ |
9f260e0e | 1608 | sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
ea00b8e2 | 1609 | bo->bcm_proc_read = proc_create_data(bo->procname, 0644, |
384317ef | 1610 | net->can.bcmproc_dir, |
ea00b8e2 | 1611 | &bcm_proc_fops, sk); |
deb507f9 OH |
1612 | if (!bo->bcm_proc_read) { |
1613 | ret = -ENOMEM; | |
1614 | goto fail; | |
1615 | } | |
ffd980f9 | 1616 | } |
c2701b37 | 1617 | #endif /* CONFIG_PROC_FS */ |
ffd980f9 | 1618 | |
deb507f9 OH |
1619 | bo->bound = 1; |
1620 | ||
1621 | fail: | |
1622 | release_sock(sk); | |
1623 | ||
1624 | return ret; | |
ffd980f9 OH |
1625 | } |
1626 | ||
1b784140 YX |
1627 | static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1628 | int flags) | |
ffd980f9 OH |
1629 | { |
1630 | struct sock *sk = sock->sk; | |
1631 | struct sk_buff *skb; | |
1632 | int error = 0; | |
1633 | int noblock; | |
1634 | int err; | |
1635 | ||
1636 | noblock = flags & MSG_DONTWAIT; | |
1637 | flags &= ~MSG_DONTWAIT; | |
1638 | skb = skb_recv_datagram(sk, flags, noblock, &error); | |
1639 | if (!skb) | |
1640 | return error; | |
1641 | ||
1642 | if (skb->len < size) | |
1643 | size = skb->len; | |
1644 | ||
7eab8d9e | 1645 | err = memcpy_to_msg(msg, skb->data, size); |
ffd980f9 OH |
1646 | if (err < 0) { |
1647 | skb_free_datagram(sk, skb); | |
1648 | return err; | |
1649 | } | |
1650 | ||
3b885787 | 1651 | sock_recv_ts_and_drops(msg, sk, skb); |
ffd980f9 OH |
1652 | |
1653 | if (msg->msg_name) { | |
342dfc30 | 1654 | __sockaddr_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
1655 | msg->msg_namelen = sizeof(struct sockaddr_can); |
1656 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1657 | } | |
1658 | ||
1659 | skb_free_datagram(sk, skb); | |
1660 | ||
1661 | return size; | |
1662 | } | |
1663 | ||
53914b67 | 1664 | static const struct proto_ops bcm_ops = { |
ffd980f9 OH |
1665 | .family = PF_CAN, |
1666 | .release = bcm_release, | |
1667 | .bind = sock_no_bind, | |
1668 | .connect = bcm_connect, | |
1669 | .socketpair = sock_no_socketpair, | |
1670 | .accept = sock_no_accept, | |
1671 | .getname = sock_no_getname, | |
1672 | .poll = datagram_poll, | |
53914b67 | 1673 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
ffd980f9 OH |
1674 | .listen = sock_no_listen, |
1675 | .shutdown = sock_no_shutdown, | |
1676 | .setsockopt = sock_no_setsockopt, | |
1677 | .getsockopt = sock_no_getsockopt, | |
1678 | .sendmsg = bcm_sendmsg, | |
1679 | .recvmsg = bcm_recvmsg, | |
1680 | .mmap = sock_no_mmap, | |
1681 | .sendpage = sock_no_sendpage, | |
1682 | }; | |
1683 | ||
1684 | static struct proto bcm_proto __read_mostly = { | |
1685 | .name = "CAN_BCM", | |
1686 | .owner = THIS_MODULE, | |
1687 | .obj_size = sizeof(struct bcm_sock), | |
1688 | .init = bcm_init, | |
1689 | }; | |
1690 | ||
1650629d | 1691 | static const struct can_proto bcm_can_proto = { |
ffd980f9 OH |
1692 | .type = SOCK_DGRAM, |
1693 | .protocol = CAN_BCM, | |
ffd980f9 OH |
1694 | .ops = &bcm_ops, |
1695 | .prot = &bcm_proto, | |
1696 | }; | |
1697 | ||
384317ef OH |
1698 | static int canbcm_pernet_init(struct net *net) |
1699 | { | |
c2701b37 | 1700 | #if IS_ENABLED(CONFIG_PROC_FS) |
384317ef | 1701 | /* create /proc/net/can-bcm directory */ |
c2701b37 OH |
1702 | net->can.bcmproc_dir = proc_net_mkdir(net, "can-bcm", net->proc_net); |
1703 | #endif /* CONFIG_PROC_FS */ | |
384317ef OH |
1704 | |
1705 | return 0; | |
1706 | } | |
1707 | ||
1708 | static void canbcm_pernet_exit(struct net *net) | |
1709 | { | |
c2701b37 | 1710 | #if IS_ENABLED(CONFIG_PROC_FS) |
384317ef | 1711 | /* remove /proc/net/can-bcm directory */ |
c2701b37 OH |
1712 | if (net->can.bcmproc_dir) |
1713 | remove_proc_entry("can-bcm", net->proc_net); | |
1714 | #endif /* CONFIG_PROC_FS */ | |
384317ef OH |
1715 | } |
1716 | ||
1717 | static struct pernet_operations canbcm_pernet_ops __read_mostly = { | |
1718 | .init = canbcm_pernet_init, | |
1719 | .exit = canbcm_pernet_exit, | |
1720 | }; | |
1721 | ||
ffd980f9 OH |
1722 | static int __init bcm_module_init(void) |
1723 | { | |
1724 | int err; | |
1725 | ||
b111b78c | 1726 | pr_info("can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"); |
ffd980f9 OH |
1727 | |
1728 | err = can_proto_register(&bcm_can_proto); | |
1729 | if (err < 0) { | |
1730 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); | |
1731 | return err; | |
1732 | } | |
1733 | ||
384317ef | 1734 | register_pernet_subsys(&canbcm_pernet_ops); |
ffd980f9 OH |
1735 | return 0; |
1736 | } | |
1737 | ||
1738 | static void __exit bcm_module_exit(void) | |
1739 | { | |
1740 | can_proto_unregister(&bcm_can_proto); | |
384317ef | 1741 | unregister_pernet_subsys(&canbcm_pernet_ops); |
ffd980f9 OH |
1742 | } |
1743 | ||
1744 | module_init(bcm_module_init); | |
1745 | module_exit(bcm_module_exit); |