blob: d6c8ae5b2e6a33da717b2de0af68bdaba54e3380 [file] [log] [blame]
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001/*
2 * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content
3 *
4 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of Volkswagen nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above.
23 *
24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules with a GPL compatible license.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
38 * DAMAGE.
39 *
40 * Send feedback to <socketcan-users@lists.berlios.de>
41 *
42 */
43
44#include <linux/module.h>
45#include <linux/init.h>
Alexey Dobriyana6b7a402011-06-06 10:43:46 +000046#include <linux/interrupt.h>
Oliver Hartkopp73e87e02008-04-15 19:29:14 -070047#include <linux/hrtimer.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080048#include <linux/list.h>
49#include <linux/proc_fs.h>
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +000050#include <linux/seq_file.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080051#include <linux/uio.h>
52#include <linux/net.h>
53#include <linux/netdevice.h>
54#include <linux/socket.h>
55#include <linux/if_arp.h>
56#include <linux/skbuff.h>
57#include <linux/can.h>
58#include <linux/can/core.h>
59#include <linux/can/bcm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090060#include <linux/slab.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080061#include <net/sock.h>
62#include <net/net_namespace.h>
63
Oliver Hartkopp5b75c492010-08-11 16:12:35 -070064/*
65 * To send multiple CAN frame content within TX_SETUP or to filter
66 * CAN messages with multiplex index within RX_SETUP, the number of
67 * different filters is limited to 256 due to the one byte index value.
68 */
69#define MAX_NFRAMES 256
70
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080071/* use of last_frames[index].can_dlc */
72#define RX_RECV 0x40 /* received data for this element */
73#define RX_THR 0x80 /* element not been sent due to throttle feature */
74#define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */
75
76/* get best masking value for can_rx_register() for a given single can_id */
Oliver Hartkoppd253eee2008-12-03 15:52:35 -080077#define REGMASK(id) ((id & CAN_EFF_FLAG) ? \
78 (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \
79 (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080080
Oliver Hartkoppd253eee2008-12-03 15:52:35 -080081#define CAN_BCM_VERSION CAN_VERSION
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080082static __initdata const char banner[] = KERN_INFO
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -080083 "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n";
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080084
85MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
86MODULE_LICENSE("Dual BSD/GPL");
87MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
Lothar Waßmannb13bb2e2009-07-14 23:12:25 +000088MODULE_ALIAS("can-proto-2");
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080089
90/* easy access to can_frame payload */
91static inline u64 GET_U64(const struct can_frame *cp)
92{
93 return *(u64 *)cp->data;
94}
95
96struct bcm_op {
97 struct list_head list;
98 int ifindex;
99 canid_t can_id;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700100 u32 flags;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800101 unsigned long frames_abs, frames_filtered;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800102 struct timeval ival1, ival2;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700103 struct hrtimer timer, thrtimer;
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800104 struct tasklet_struct tsklet, thrtsklet;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700105 ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800106 int rx_ifindex;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700107 u32 count;
108 u32 nframes;
109 u32 currframe;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800110 struct can_frame *frames;
111 struct can_frame *last_frames;
112 struct can_frame sframe;
113 struct can_frame last_sframe;
114 struct sock *sk;
115 struct net_device *rx_reg_dev;
116};
117
118static struct proc_dir_entry *proc_dir;
119
120struct bcm_sock {
121 struct sock sk;
122 int bound;
123 int ifindex;
124 struct notifier_block notifier;
125 struct list_head rx_ops;
126 struct list_head tx_ops;
127 unsigned long dropped_usr_msgs;
128 struct proc_dir_entry *bcm_proc_read;
Dan Rosenberg9f260e02010-12-26 06:54:53 +0000129 char procname [32]; /* inode number in decimal with \0 */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800130};
131
132static inline struct bcm_sock *bcm_sk(const struct sock *sk)
133{
134 return (struct bcm_sock *)sk;
135}
136
137#define CFSIZ sizeof(struct can_frame)
138#define OPSIZ sizeof(struct bcm_op)
139#define MHSIZ sizeof(struct bcm_msg_head)
140
141/*
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800142 * procfs functions
143 */
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000144static char *bcm_proc_getifname(char *result, int ifindex)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800145{
146 struct net_device *dev;
147
148 if (!ifindex)
149 return "any";
150
stephen hemmingerff879eb2009-11-10 07:54:56 +0000151 rcu_read_lock();
152 dev = dev_get_by_index_rcu(&init_net, ifindex);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800153 if (dev)
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000154 strcpy(result, dev->name);
155 else
156 strcpy(result, "???");
stephen hemmingerff879eb2009-11-10 07:54:56 +0000157 rcu_read_unlock();
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800158
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000159 return result;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800160}
161
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000162static int bcm_proc_show(struct seq_file *m, void *v)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800163{
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000164 char ifname[IFNAMSIZ];
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000165 struct sock *sk = (struct sock *)m->private;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800166 struct bcm_sock *bo = bcm_sk(sk);
167 struct bcm_op *op;
168
Dan Rosenberg71338aa2011-05-23 12:17:35 +0000169 seq_printf(m, ">>> socket %pK", sk->sk_socket);
170 seq_printf(m, " / sk %pK", sk);
171 seq_printf(m, " / bo %pK", bo);
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000172 seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs);
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000173 seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex));
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000174 seq_printf(m, " <<<\n");
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800175
176 list_for_each_entry(op, &bo->rx_ops, list) {
177
178 unsigned long reduction;
179
180 /* print only active entries & prevent division by zero */
181 if (!op->frames_abs)
182 continue;
183
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000184 seq_printf(m, "rx_op: %03X %-5s ",
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000185 op->can_id, bcm_proc_getifname(ifname, op->ifindex));
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700186 seq_printf(m, "[%u]%c ", op->nframes,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800187 (op->flags & RX_CHECK_DLC)?'d':' ');
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700188 if (op->kt_ival1.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000189 seq_printf(m, "timeo=%lld ",
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700190 (long long)
191 ktime_to_us(op->kt_ival1));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800192
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700193 if (op->kt_ival2.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000194 seq_printf(m, "thr=%lld ",
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700195 (long long)
196 ktime_to_us(op->kt_ival2));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800197
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000198 seq_printf(m, "# recv %ld (%ld) => reduction: ",
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800199 op->frames_filtered, op->frames_abs);
200
201 reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
202
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000203 seq_printf(m, "%s%ld%%\n",
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800204 (reduction == 100)?"near ":"", reduction);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800205 }
206
207 list_for_each_entry(op, &bo->tx_ops, list) {
208
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700209 seq_printf(m, "tx_op: %03X %s [%u] ",
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000210 op->can_id,
211 bcm_proc_getifname(ifname, op->ifindex),
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800212 op->nframes);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800213
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700214 if (op->kt_ival1.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000215 seq_printf(m, "t1=%lld ",
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700216 (long long) ktime_to_us(op->kt_ival1));
217
218 if (op->kt_ival2.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000219 seq_printf(m, "t2=%lld ",
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700220 (long long) ktime_to_us(op->kt_ival2));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800221
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000222 seq_printf(m, "# sent %ld\n", op->frames_abs);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800223 }
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000224 seq_putc(m, '\n');
225 return 0;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800226}
227
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000228static int bcm_proc_open(struct inode *inode, struct file *file)
229{
230 return single_open(file, bcm_proc_show, PDE(inode)->data);
231}
232
233static const struct file_operations bcm_proc_fops = {
234 .owner = THIS_MODULE,
235 .open = bcm_proc_open,
236 .read = seq_read,
237 .llseek = seq_lseek,
238 .release = single_release,
239};
240
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800241/*
242 * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface
243 * of the given bcm tx op
244 */
245static void bcm_can_tx(struct bcm_op *op)
246{
247 struct sk_buff *skb;
248 struct net_device *dev;
249 struct can_frame *cf = &op->frames[op->currframe];
250
251 /* no target device? => exit */
252 if (!op->ifindex)
253 return;
254
255 dev = dev_get_by_index(&init_net, op->ifindex);
256 if (!dev) {
257 /* RFC: should this bcm_op remove itself here? */
258 return;
259 }
260
261 skb = alloc_skb(CFSIZ, gfp_any());
262 if (!skb)
263 goto out;
264
265 memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
266
267 /* send with loopback */
268 skb->dev = dev;
269 skb->sk = op->sk;
270 can_send(skb, 1);
271
272 /* update statistics */
273 op->currframe++;
274 op->frames_abs++;
275
276 /* reached last frame? */
277 if (op->currframe >= op->nframes)
278 op->currframe = 0;
279 out:
280 dev_put(dev);
281}
282
283/*
284 * bcm_send_to_user - send a BCM message to the userspace
285 * (consisting of bcm_msg_head + x CAN frames)
286 */
287static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
288 struct can_frame *frames, int has_timestamp)
289{
290 struct sk_buff *skb;
291 struct can_frame *firstframe;
292 struct sockaddr_can *addr;
293 struct sock *sk = op->sk;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700294 unsigned int datalen = head->nframes * CFSIZ;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800295 int err;
296
297 skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
298 if (!skb)
299 return;
300
301 memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
302
303 if (head->nframes) {
304 /* can_frames starting here */
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700305 firstframe = (struct can_frame *)skb_tail_pointer(skb);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800306
307 memcpy(skb_put(skb, datalen), frames, datalen);
308
309 /*
310 * the BCM uses the can_dlc-element of the can_frame
311 * structure for internal purposes. This is only
312 * relevant for updates that are generated by the
313 * BCM, where nframes is 1
314 */
315 if (head->nframes == 1)
316 firstframe->can_dlc &= BCM_CAN_DLC_MASK;
317 }
318
319 if (has_timestamp) {
320 /* restore rx timestamp */
321 skb->tstamp = op->rx_stamp;
322 }
323
324 /*
325 * Put the datagram to the queue so that bcm_recvmsg() can
326 * get it from there. We need to pass the interface index to
327 * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
328 * containing the interface index.
329 */
330
331 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
332 addr = (struct sockaddr_can *)skb->cb;
333 memset(addr, 0, sizeof(*addr));
334 addr->can_family = AF_CAN;
335 addr->can_ifindex = op->rx_ifindex;
336
337 err = sock_queue_rcv_skb(sk, skb);
338 if (err < 0) {
339 struct bcm_sock *bo = bcm_sk(sk);
340
341 kfree_skb(skb);
342 /* don't care about overflows in this statistic */
343 bo->dropped_usr_msgs++;
344 }
345}
346
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800347static void bcm_tx_timeout_tsklet(unsigned long data)
348{
349 struct bcm_op *op = (struct bcm_op *)data;
350 struct bcm_msg_head msg_head;
351
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800352 if (op->kt_ival1.tv64 && (op->count > 0)) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800353
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800354 op->count--;
355 if (!op->count && (op->flags & TX_COUNTEVT)) {
356
357 /* create notification to user */
358 msg_head.opcode = TX_EXPIRED;
359 msg_head.flags = op->flags;
360 msg_head.count = op->count;
361 msg_head.ival1 = op->ival1;
362 msg_head.ival2 = op->ival2;
363 msg_head.can_id = op->can_id;
364 msg_head.nframes = 0;
365
366 bcm_send_to_user(op, &msg_head, NULL, 0);
367 }
368 }
369
370 if (op->kt_ival1.tv64 && (op->count > 0)) {
371
372 /* send (next) frame */
373 bcm_can_tx(op);
374 hrtimer_start(&op->timer,
375 ktime_add(ktime_get(), op->kt_ival1),
376 HRTIMER_MODE_ABS);
377
378 } else {
379 if (op->kt_ival2.tv64) {
380
381 /* send (next) frame */
382 bcm_can_tx(op);
383 hrtimer_start(&op->timer,
384 ktime_add(ktime_get(), op->kt_ival2),
385 HRTIMER_MODE_ABS);
386 }
387 }
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800388}
389
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800390/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300391 * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800392 */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700393static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800394{
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700395 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800396
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800397 tasklet_schedule(&op->tsklet);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800398
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800399 return HRTIMER_NORESTART;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800400}
401
402/*
403 * bcm_rx_changed - create a RX_CHANGED notification due to changed content
404 */
405static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data)
406{
407 struct bcm_msg_head head;
408
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800409 /* update statistics */
410 op->frames_filtered++;
411
412 /* prevent statistics overflow */
413 if (op->frames_filtered > ULONG_MAX/100)
414 op->frames_filtered = op->frames_abs = 0;
415
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800416 /* this element is not throttled anymore */
417 data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV);
418
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800419 head.opcode = RX_CHANGED;
420 head.flags = op->flags;
421 head.count = op->count;
422 head.ival1 = op->ival1;
423 head.ival2 = op->ival2;
424 head.can_id = op->can_id;
425 head.nframes = 1;
426
427 bcm_send_to_user(op, &head, data, 1);
428}
429
430/*
431 * bcm_rx_update_and_send - process a detected relevant receive content change
432 * 1. update the last received data
433 * 2. send a notification to the user (if possible)
434 */
435static void bcm_rx_update_and_send(struct bcm_op *op,
436 struct can_frame *lastdata,
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800437 const struct can_frame *rxdata)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800438{
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800439 memcpy(lastdata, rxdata, CFSIZ);
440
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800441 /* mark as used and throttled by default */
442 lastdata->can_dlc |= (RX_RECV|RX_THR);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800443
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800444 /* throtteling mode inactive ? */
445 if (!op->kt_ival2.tv64) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800446 /* send RX_CHANGED to the user immediately */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800447 bcm_rx_changed(op, lastdata);
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700448 return;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800449 }
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700450
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800451 /* with active throttling timer we are just done here */
452 if (hrtimer_active(&op->thrtimer))
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700453 return;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700454
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800455 /* first receiption with enabled throttling mode */
456 if (!op->kt_lastmsg.tv64)
457 goto rx_changed_settime;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700458
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800459 /* got a second frame inside a potential throttle period? */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700460 if (ktime_us_delta(ktime_get(), op->kt_lastmsg) <
461 ktime_to_us(op->kt_ival2)) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800462 /* do not send the saved data - only start throttle timer */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700463 hrtimer_start(&op->thrtimer,
464 ktime_add(op->kt_lastmsg, op->kt_ival2),
465 HRTIMER_MODE_ABS);
466 return;
467 }
468
469 /* the gap was that big, that throttling was not needed here */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800470rx_changed_settime:
471 bcm_rx_changed(op, lastdata);
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700472 op->kt_lastmsg = ktime_get();
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800473}
474
475/*
476 * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly
477 * received data stored in op->last_frames[]
478 */
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700479static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index,
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800480 const struct can_frame *rxdata)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800481{
482 /*
483 * no one uses the MSBs of can_dlc for comparation,
484 * so we use it here to detect the first time of reception
485 */
486
487 if (!(op->last_frames[index].can_dlc & RX_RECV)) {
488 /* received data for the first time => send update to user */
489 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
490 return;
491 }
492
493 /* do a real check in can_frame data section */
494
495 if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) !=
496 (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) {
497 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
498 return;
499 }
500
501 if (op->flags & RX_CHECK_DLC) {
502 /* do a real check in can_frame dlc */
503 if (rxdata->can_dlc != (op->last_frames[index].can_dlc &
504 BCM_CAN_DLC_MASK)) {
505 bcm_rx_update_and_send(op, &op->last_frames[index],
506 rxdata);
507 return;
508 }
509 }
510}
511
512/*
513 * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption
514 */
515static void bcm_rx_starttimer(struct bcm_op *op)
516{
517 if (op->flags & RX_NO_AUTOTIMER)
518 return;
519
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700520 if (op->kt_ival1.tv64)
521 hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800522}
523
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800524static void bcm_rx_timeout_tsklet(unsigned long data)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800525{
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800526 struct bcm_op *op = (struct bcm_op *)data;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800527 struct bcm_msg_head msg_head;
528
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800529 /* create notification to user */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800530 msg_head.opcode = RX_TIMEOUT;
531 msg_head.flags = op->flags;
532 msg_head.count = op->count;
533 msg_head.ival1 = op->ival1;
534 msg_head.ival2 = op->ival2;
535 msg_head.can_id = op->can_id;
536 msg_head.nframes = 0;
537
538 bcm_send_to_user(op, &msg_head, NULL, 0);
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800539}
540
541/*
542 * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out
543 */
544static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer)
545{
546 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
547
548 /* schedule before NET_RX_SOFTIRQ */
549 tasklet_hi_schedule(&op->tsklet);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800550
551 /* no restart of the timer is done here! */
552
553 /* if user wants to be informed, when cyclic CAN-Messages come back */
554 if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) {
555 /* clear received can_frames to indicate 'nothing received' */
556 memset(op->last_frames, 0, op->nframes * CFSIZ);
557 }
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700558
559 return HRTIMER_NORESTART;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800560}
561
562/*
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800563 * bcm_rx_do_flush - helper for bcm_rx_thr_flush
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800564 */
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700565static inline int bcm_rx_do_flush(struct bcm_op *op, int update,
566 unsigned int index)
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800567{
568 if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) {
569 if (update)
570 bcm_rx_changed(op, &op->last_frames[index]);
571 return 1;
572 }
573 return 0;
574}
575
576/*
577 * bcm_rx_thr_flush - Check for throttled data and send it to the userspace
578 *
579 * update == 0 : just check if throttled data is available (any irq context)
580 * update == 1 : check and send throttled data to userspace (soft_irq context)
581 */
582static int bcm_rx_thr_flush(struct bcm_op *op, int update)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800583{
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700584 int updated = 0;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800585
586 if (op->nframes > 1) {
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700587 unsigned int i;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700588
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800589 /* for MUX filter we start at index 1 */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800590 for (i = 1; i < op->nframes; i++)
591 updated += bcm_rx_do_flush(op, update, i);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800592
593 } else {
594 /* for RX_FILTER_ID and simple filter */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800595 updated += bcm_rx_do_flush(op, update, 0);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800596 }
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700597
598 return updated;
599}
600
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800601static void bcm_rx_thr_tsklet(unsigned long data)
602{
603 struct bcm_op *op = (struct bcm_op *)data;
604
605 /* push the changed data to the userspace */
606 bcm_rx_thr_flush(op, 1);
607}
608
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700609/*
610 * bcm_rx_thr_handler - the time for blocked content updates is over now:
611 * Check for throttled data and send it to the userspace
612 */
613static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer)
614{
615 struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer);
616
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800617 tasklet_schedule(&op->thrtsklet);
618
619 if (bcm_rx_thr_flush(op, 0)) {
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700620 hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2);
621 return HRTIMER_RESTART;
622 } else {
623 /* rearm throttle handling */
624 op->kt_lastmsg = ktime_set(0, 0);
625 return HRTIMER_NORESTART;
626 }
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800627}
628
629/*
630 * bcm_rx_handler - handle a CAN frame receiption
631 */
632static void bcm_rx_handler(struct sk_buff *skb, void *data)
633{
634 struct bcm_op *op = (struct bcm_op *)data;
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800635 const struct can_frame *rxframe = (struct can_frame *)skb->data;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700636 unsigned int i;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800637
638 /* disable timeout */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700639 hrtimer_cancel(&op->timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800640
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800641 if (op->can_id != rxframe->can_id)
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800642 return;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800643
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800644 /* save rx timestamp */
645 op->rx_stamp = skb->tstamp;
646 /* save originator for recvfrom() */
647 op->rx_ifindex = skb->dev->ifindex;
648 /* update statistics */
649 op->frames_abs++;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800650
651 if (op->flags & RX_RTR_FRAME) {
652 /* send reply for RTR-request (placed in op->frames[0]) */
653 bcm_can_tx(op);
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800654 return;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800655 }
656
657 if (op->flags & RX_FILTER_ID) {
658 /* the easiest case */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800659 bcm_rx_update_and_send(op, &op->last_frames[0], rxframe);
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800660 goto rx_starttimer;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800661 }
662
663 if (op->nframes == 1) {
664 /* simple compare with index 0 */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800665 bcm_rx_cmp_to_index(op, 0, rxframe);
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800666 goto rx_starttimer;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800667 }
668
669 if (op->nframes > 1) {
670 /*
671 * multiplex compare
672 *
673 * find the first multiplex mask that fits.
674 * Remark: The MUX-mask is stored in index 0
675 */
676
677 for (i = 1; i < op->nframes; i++) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800678 if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) ==
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800679 (GET_U64(&op->frames[0]) &
680 GET_U64(&op->frames[i]))) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800681 bcm_rx_cmp_to_index(op, i, rxframe);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800682 break;
683 }
684 }
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800685 }
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800686
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800687rx_starttimer:
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800688 bcm_rx_starttimer(op);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800689}
690
691/*
692 * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements
693 */
694static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id,
695 int ifindex)
696{
697 struct bcm_op *op;
698
699 list_for_each_entry(op, ops, list) {
700 if ((op->can_id == can_id) && (op->ifindex == ifindex))
701 return op;
702 }
703
704 return NULL;
705}
706
707static void bcm_remove_op(struct bcm_op *op)
708{
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700709 hrtimer_cancel(&op->timer);
710 hrtimer_cancel(&op->thrtimer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800711
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800712 if (op->tsklet.func)
713 tasklet_kill(&op->tsklet);
714
715 if (op->thrtsklet.func)
716 tasklet_kill(&op->thrtsklet);
717
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800718 if ((op->frames) && (op->frames != &op->sframe))
719 kfree(op->frames);
720
721 if ((op->last_frames) && (op->last_frames != &op->last_sframe))
722 kfree(op->last_frames);
723
724 kfree(op);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800725}
726
727static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
728{
729 if (op->rx_reg_dev == dev) {
730 can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
731 bcm_rx_handler, op);
732
733 /* mark as removed subscription */
734 op->rx_reg_dev = NULL;
735 } else
736 printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device "
737 "mismatch %p %p\n", op->rx_reg_dev, dev);
738}
739
740/*
741 * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops)
742 */
743static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex)
744{
745 struct bcm_op *op, *n;
746
747 list_for_each_entry_safe(op, n, ops, list) {
748 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
749
750 /*
751 * Don't care if we're bound or not (due to netdev
752 * problems) can_rx_unregister() is always a save
753 * thing to do here.
754 */
755 if (op->ifindex) {
756 /*
757 * Only remove subscriptions that had not
758 * been removed due to NETDEV_UNREGISTER
759 * in bcm_notifier()
760 */
761 if (op->rx_reg_dev) {
762 struct net_device *dev;
763
764 dev = dev_get_by_index(&init_net,
765 op->ifindex);
766 if (dev) {
767 bcm_rx_unreg(dev, op);
768 dev_put(dev);
769 }
770 }
771 } else
772 can_rx_unregister(NULL, op->can_id,
773 REGMASK(op->can_id),
774 bcm_rx_handler, op);
775
776 list_del(&op->list);
777 bcm_remove_op(op);
778 return 1; /* done */
779 }
780 }
781
782 return 0; /* not found */
783}
784
785/*
786 * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops)
787 */
788static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex)
789{
790 struct bcm_op *op, *n;
791
792 list_for_each_entry_safe(op, n, ops, list) {
793 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
794 list_del(&op->list);
795 bcm_remove_op(op);
796 return 1; /* done */
797 }
798 }
799
800 return 0; /* not found */
801}
802
803/*
804 * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg)
805 */
806static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
807 int ifindex)
808{
809 struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex);
810
811 if (!op)
812 return -EINVAL;
813
814 /* put current values into msg_head */
815 msg_head->flags = op->flags;
816 msg_head->count = op->count;
817 msg_head->ival1 = op->ival1;
818 msg_head->ival2 = op->ival2;
819 msg_head->nframes = op->nframes;
820
821 bcm_send_to_user(op, msg_head, op->frames, 0);
822
823 return MHSIZ;
824}
825
826/*
827 * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg)
828 */
829static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
830 int ifindex, struct sock *sk)
831{
832 struct bcm_sock *bo = bcm_sk(sk);
833 struct bcm_op *op;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700834 unsigned int i;
835 int err;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800836
837 /* we need a real device to send frames */
838 if (!ifindex)
839 return -ENODEV;
840
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700841 /* check nframes boundaries - we need at least one can_frame */
842 if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800843 return -EINVAL;
844
845 /* check the given can_id */
846 op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex);
847
848 if (op) {
849 /* update existing BCM operation */
850
851 /*
852 * Do we need more space for the can_frames than currently
853 * allocated? -> This is a _really_ unusual use-case and
854 * therefore (complexity / locking) it is not supported.
855 */
856 if (msg_head->nframes > op->nframes)
857 return -E2BIG;
858
859 /* update can_frames content */
860 for (i = 0; i < msg_head->nframes; i++) {
861 err = memcpy_fromiovec((u8 *)&op->frames[i],
862 msg->msg_iov, CFSIZ);
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700863
864 if (op->frames[i].can_dlc > 8)
865 err = -EINVAL;
866
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800867 if (err < 0)
868 return err;
869
870 if (msg_head->flags & TX_CP_CAN_ID) {
871 /* copy can_id into frame */
872 op->frames[i].can_id = msg_head->can_id;
873 }
874 }
875
876 } else {
877 /* insert new BCM operation for the given can_id */
878
879 op = kzalloc(OPSIZ, GFP_KERNEL);
880 if (!op)
881 return -ENOMEM;
882
883 op->can_id = msg_head->can_id;
884
885 /* create array for can_frames and copy the data */
886 if (msg_head->nframes > 1) {
887 op->frames = kmalloc(msg_head->nframes * CFSIZ,
888 GFP_KERNEL);
889 if (!op->frames) {
890 kfree(op);
891 return -ENOMEM;
892 }
893 } else
894 op->frames = &op->sframe;
895
896 for (i = 0; i < msg_head->nframes; i++) {
897 err = memcpy_fromiovec((u8 *)&op->frames[i],
898 msg->msg_iov, CFSIZ);
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700899
900 if (op->frames[i].can_dlc > 8)
901 err = -EINVAL;
902
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800903 if (err < 0) {
904 if (op->frames != &op->sframe)
905 kfree(op->frames);
906 kfree(op);
907 return err;
908 }
909
910 if (msg_head->flags & TX_CP_CAN_ID) {
911 /* copy can_id into frame */
912 op->frames[i].can_id = msg_head->can_id;
913 }
914 }
915
916 /* tx_ops never compare with previous received messages */
917 op->last_frames = NULL;
918
919 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
920 op->sk = sk;
921 op->ifindex = ifindex;
922
923 /* initialize uninitialized (kzalloc) structure */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700924 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
925 op->timer.function = bcm_tx_timeout_handler;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800926
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800927 /* initialize tasklet for tx countevent notification */
928 tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
929 (unsigned long) op);
930
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800931 /* currently unused in tx_ops */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700932 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800933
934 /* add this bcm_op to the list of the tx_ops */
935 list_add(&op->list, &bo->tx_ops);
936
937 } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */
938
939 if (op->nframes != msg_head->nframes) {
940 op->nframes = msg_head->nframes;
941 /* start multiple frame transmission with index 0 */
942 op->currframe = 0;
943 }
944
945 /* check flags */
946
947 op->flags = msg_head->flags;
948
949 if (op->flags & TX_RESET_MULTI_IDX) {
950 /* start multiple frame transmission with index 0 */
951 op->currframe = 0;
952 }
953
954 if (op->flags & SETTIMER) {
955 /* set timer values */
956 op->count = msg_head->count;
957 op->ival1 = msg_head->ival1;
958 op->ival2 = msg_head->ival2;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700959 op->kt_ival1 = timeval_to_ktime(msg_head->ival1);
960 op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800961
962 /* disable an active timer due to zero values? */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700963 if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64)
964 hrtimer_cancel(&op->timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800965 }
966
967 if ((op->flags & STARTTIMER) &&
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700968 ((op->kt_ival1.tv64 && op->count) || op->kt_ival2.tv64)) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800969
970 /* spec: send can_frame when starting timer */
971 op->flags |= TX_ANNOUNCE;
972
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700973 if (op->kt_ival1.tv64 && (op->count > 0)) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800974 /* op->count-- is done in bcm_tx_timeout_handler */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700975 hrtimer_start(&op->timer, op->kt_ival1,
976 HRTIMER_MODE_REL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800977 } else
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700978 hrtimer_start(&op->timer, op->kt_ival2,
979 HRTIMER_MODE_REL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800980 }
981
982 if (op->flags & TX_ANNOUNCE)
983 bcm_can_tx(op);
984
985 return msg_head->nframes * CFSIZ + MHSIZ;
986}
987
988/*
989 * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg)
990 */
991static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
992 int ifindex, struct sock *sk)
993{
994 struct bcm_sock *bo = bcm_sk(sk);
995 struct bcm_op *op;
996 int do_rx_register;
997 int err = 0;
998
999 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
1000 /* be robust against wrong usage ... */
1001 msg_head->flags |= RX_FILTER_ID;
1002 /* ignore trailing garbage */
1003 msg_head->nframes = 0;
1004 }
1005
Oliver Hartkopp5b75c492010-08-11 16:12:35 -07001006 /* the first element contains the mux-mask => MAX_NFRAMES + 1 */
1007 if (msg_head->nframes > MAX_NFRAMES + 1)
1008 return -EINVAL;
1009
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001010 if ((msg_head->flags & RX_RTR_FRAME) &&
1011 ((msg_head->nframes != 1) ||
1012 (!(msg_head->can_id & CAN_RTR_FLAG))))
1013 return -EINVAL;
1014
1015 /* check the given can_id */
1016 op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex);
1017 if (op) {
1018 /* update existing BCM operation */
1019
1020 /*
1021 * Do we need more space for the can_frames than currently
1022 * allocated? -> This is a _really_ unusual use-case and
1023 * therefore (complexity / locking) it is not supported.
1024 */
1025 if (msg_head->nframes > op->nframes)
1026 return -E2BIG;
1027
1028 if (msg_head->nframes) {
1029 /* update can_frames content */
1030 err = memcpy_fromiovec((u8 *)op->frames,
1031 msg->msg_iov,
1032 msg_head->nframes * CFSIZ);
1033 if (err < 0)
1034 return err;
1035
1036 /* clear last_frames to indicate 'nothing received' */
1037 memset(op->last_frames, 0, msg_head->nframes * CFSIZ);
1038 }
1039
1040 op->nframes = msg_head->nframes;
1041
1042 /* Only an update -> do not call can_rx_register() */
1043 do_rx_register = 0;
1044
1045 } else {
1046 /* insert new BCM operation for the given can_id */
1047 op = kzalloc(OPSIZ, GFP_KERNEL);
1048 if (!op)
1049 return -ENOMEM;
1050
1051 op->can_id = msg_head->can_id;
1052 op->nframes = msg_head->nframes;
1053
1054 if (msg_head->nframes > 1) {
1055 /* create array for can_frames and copy the data */
1056 op->frames = kmalloc(msg_head->nframes * CFSIZ,
1057 GFP_KERNEL);
1058 if (!op->frames) {
1059 kfree(op);
1060 return -ENOMEM;
1061 }
1062
1063 /* create and init array for received can_frames */
1064 op->last_frames = kzalloc(msg_head->nframes * CFSIZ,
1065 GFP_KERNEL);
1066 if (!op->last_frames) {
1067 kfree(op->frames);
1068 kfree(op);
1069 return -ENOMEM;
1070 }
1071
1072 } else {
1073 op->frames = &op->sframe;
1074 op->last_frames = &op->last_sframe;
1075 }
1076
1077 if (msg_head->nframes) {
1078 err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov,
1079 msg_head->nframes * CFSIZ);
1080 if (err < 0) {
1081 if (op->frames != &op->sframe)
1082 kfree(op->frames);
1083 if (op->last_frames != &op->last_sframe)
1084 kfree(op->last_frames);
1085 kfree(op);
1086 return err;
1087 }
1088 }
1089
1090 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
1091 op->sk = sk;
1092 op->ifindex = ifindex;
1093
1094 /* initialize uninitialized (kzalloc) structure */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001095 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1096 op->timer.function = bcm_rx_timeout_handler;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001097
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -08001098 /* initialize tasklet for rx timeout notification */
1099 tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
1100 (unsigned long) op);
1101
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001102 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1103 op->thrtimer.function = bcm_rx_thr_handler;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001104
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -08001105 /* initialize tasklet for rx throttle handling */
1106 tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
1107 (unsigned long) op);
1108
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001109 /* add this bcm_op to the list of the rx_ops */
1110 list_add(&op->list, &bo->rx_ops);
1111
1112 /* call can_rx_register() */
1113 do_rx_register = 1;
1114
1115 } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */
1116
1117 /* check flags */
1118 op->flags = msg_head->flags;
1119
1120 if (op->flags & RX_RTR_FRAME) {
1121
1122 /* no timers in RTR-mode */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001123 hrtimer_cancel(&op->thrtimer);
1124 hrtimer_cancel(&op->timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001125
1126 /*
1127 * funny feature in RX(!)_SETUP only for RTR-mode:
1128 * copy can_id into frame BUT without RTR-flag to
1129 * prevent a full-load-loopback-test ... ;-]
1130 */
1131 if ((op->flags & TX_CP_CAN_ID) ||
1132 (op->frames[0].can_id == op->can_id))
1133 op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG;
1134
1135 } else {
1136 if (op->flags & SETTIMER) {
1137
1138 /* set timer value */
1139 op->ival1 = msg_head->ival1;
1140 op->ival2 = msg_head->ival2;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001141 op->kt_ival1 = timeval_to_ktime(msg_head->ival1);
1142 op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001143
1144 /* disable an active timer due to zero value? */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001145 if (!op->kt_ival1.tv64)
1146 hrtimer_cancel(&op->timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001147
1148 /*
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001149 * In any case cancel the throttle timer, flush
1150 * potentially blocked msgs and reset throttle handling
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001151 */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001152 op->kt_lastmsg = ktime_set(0, 0);
1153 hrtimer_cancel(&op->thrtimer);
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -08001154 bcm_rx_thr_flush(op, 1);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001155 }
1156
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001157 if ((op->flags & STARTTIMER) && op->kt_ival1.tv64)
1158 hrtimer_start(&op->timer, op->kt_ival1,
1159 HRTIMER_MODE_REL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001160 }
1161
1162 /* now we can register for can_ids, if we added a new bcm_op */
1163 if (do_rx_register) {
1164 if (ifindex) {
1165 struct net_device *dev;
1166
1167 dev = dev_get_by_index(&init_net, ifindex);
1168 if (dev) {
1169 err = can_rx_register(dev, op->can_id,
1170 REGMASK(op->can_id),
1171 bcm_rx_handler, op,
1172 "bcm");
1173
1174 op->rx_reg_dev = dev;
1175 dev_put(dev);
1176 }
1177
1178 } else
1179 err = can_rx_register(NULL, op->can_id,
1180 REGMASK(op->can_id),
1181 bcm_rx_handler, op, "bcm");
1182 if (err) {
1183 /* this bcm rx op is broken -> remove it */
1184 list_del(&op->list);
1185 bcm_remove_op(op);
1186 return err;
1187 }
1188 }
1189
1190 return msg_head->nframes * CFSIZ + MHSIZ;
1191}
1192
1193/*
1194 * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg)
1195 */
1196static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
1197{
1198 struct sk_buff *skb;
1199 struct net_device *dev;
1200 int err;
1201
1202 /* we need a real device to send frames */
1203 if (!ifindex)
1204 return -ENODEV;
1205
1206 skb = alloc_skb(CFSIZ, GFP_KERNEL);
1207
1208 if (!skb)
1209 return -ENOMEM;
1210
1211 err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
1212 if (err < 0) {
1213 kfree_skb(skb);
1214 return err;
1215 }
1216
1217 dev = dev_get_by_index(&init_net, ifindex);
1218 if (!dev) {
1219 kfree_skb(skb);
1220 return -ENODEV;
1221 }
1222
1223 skb->dev = dev;
1224 skb->sk = sk;
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001225 err = can_send(skb, 1); /* send with loopback */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001226 dev_put(dev);
1227
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001228 if (err)
1229 return err;
1230
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001231 return CFSIZ + MHSIZ;
1232}
1233
1234/*
1235 * bcm_sendmsg - process BCM commands (opcodes) from the userspace
1236 */
1237static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock,
1238 struct msghdr *msg, size_t size)
1239{
1240 struct sock *sk = sock->sk;
1241 struct bcm_sock *bo = bcm_sk(sk);
1242 int ifindex = bo->ifindex; /* default ifindex for this bcm_op */
1243 struct bcm_msg_head msg_head;
1244 int ret; /* read bytes or error codes as return value */
1245
1246 if (!bo->bound)
1247 return -ENOTCONN;
1248
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001249 /* check for valid message length from userspace */
1250 if (size < MHSIZ || (size - MHSIZ) % CFSIZ)
1251 return -EINVAL;
1252
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001253 /* check for alternative ifindex for this bcm_op */
1254
1255 if (!ifindex && msg->msg_name) {
1256 /* no bound device as default => check msg_name */
1257 struct sockaddr_can *addr =
1258 (struct sockaddr_can *)msg->msg_name;
1259
Kurt Van Dijck5e507322011-01-15 20:56:42 -08001260 if (msg->msg_namelen < sizeof(*addr))
1261 return -EINVAL;
1262
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001263 if (addr->can_family != AF_CAN)
1264 return -EINVAL;
1265
1266 /* ifindex from sendto() */
1267 ifindex = addr->can_ifindex;
1268
1269 if (ifindex) {
1270 struct net_device *dev;
1271
1272 dev = dev_get_by_index(&init_net, ifindex);
1273 if (!dev)
1274 return -ENODEV;
1275
1276 if (dev->type != ARPHRD_CAN) {
1277 dev_put(dev);
1278 return -ENODEV;
1279 }
1280
1281 dev_put(dev);
1282 }
1283 }
1284
1285 /* read message head information */
1286
1287 ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ);
1288 if (ret < 0)
1289 return ret;
1290
1291 lock_sock(sk);
1292
1293 switch (msg_head.opcode) {
1294
1295 case TX_SETUP:
1296 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1297 break;
1298
1299 case RX_SETUP:
1300 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1301 break;
1302
1303 case TX_DELETE:
1304 if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex))
1305 ret = MHSIZ;
1306 else
1307 ret = -EINVAL;
1308 break;
1309
1310 case RX_DELETE:
1311 if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex))
1312 ret = MHSIZ;
1313 else
1314 ret = -EINVAL;
1315 break;
1316
1317 case TX_READ:
1318 /* reuse msg_head for the reply to TX_READ */
1319 msg_head.opcode = TX_STATUS;
1320 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1321 break;
1322
1323 case RX_READ:
1324 /* reuse msg_head for the reply to RX_READ */
1325 msg_head.opcode = RX_STATUS;
1326 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1327 break;
1328
1329 case TX_SEND:
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001330 /* we need exactly one can_frame behind the msg head */
1331 if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001332 ret = -EINVAL;
1333 else
1334 ret = bcm_tx_send(msg, ifindex, sk);
1335 break;
1336
1337 default:
1338 ret = -EINVAL;
1339 break;
1340 }
1341
1342 release_sock(sk);
1343
1344 return ret;
1345}
1346
1347/*
1348 * notification handler for netdevice status changes
1349 */
1350static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
1351 void *data)
1352{
1353 struct net_device *dev = (struct net_device *)data;
1354 struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
1355 struct sock *sk = &bo->sk;
1356 struct bcm_op *op;
1357 int notify_enodev = 0;
1358
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -07001359 if (!net_eq(dev_net(dev), &init_net))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001360 return NOTIFY_DONE;
1361
1362 if (dev->type != ARPHRD_CAN)
1363 return NOTIFY_DONE;
1364
1365 switch (msg) {
1366
1367 case NETDEV_UNREGISTER:
1368 lock_sock(sk);
1369
1370 /* remove device specific receive entries */
1371 list_for_each_entry(op, &bo->rx_ops, list)
1372 if (op->rx_reg_dev == dev)
1373 bcm_rx_unreg(dev, op);
1374
1375 /* remove device reference, if this is our bound device */
1376 if (bo->bound && bo->ifindex == dev->ifindex) {
1377 bo->bound = 0;
1378 bo->ifindex = 0;
1379 notify_enodev = 1;
1380 }
1381
1382 release_sock(sk);
1383
1384 if (notify_enodev) {
1385 sk->sk_err = ENODEV;
1386 if (!sock_flag(sk, SOCK_DEAD))
1387 sk->sk_error_report(sk);
1388 }
1389 break;
1390
1391 case NETDEV_DOWN:
1392 if (bo->bound && bo->ifindex == dev->ifindex) {
1393 sk->sk_err = ENETDOWN;
1394 if (!sock_flag(sk, SOCK_DEAD))
1395 sk->sk_error_report(sk);
1396 }
1397 }
1398
1399 return NOTIFY_DONE;
1400}
1401
1402/*
1403 * initial settings for all BCM sockets to be set at socket creation time
1404 */
1405static int bcm_init(struct sock *sk)
1406{
1407 struct bcm_sock *bo = bcm_sk(sk);
1408
1409 bo->bound = 0;
1410 bo->ifindex = 0;
1411 bo->dropped_usr_msgs = 0;
1412 bo->bcm_proc_read = NULL;
1413
1414 INIT_LIST_HEAD(&bo->tx_ops);
1415 INIT_LIST_HEAD(&bo->rx_ops);
1416
1417 /* set notifier */
1418 bo->notifier.notifier_call = bcm_notifier;
1419
1420 register_netdevice_notifier(&bo->notifier);
1421
1422 return 0;
1423}
1424
1425/*
1426 * standard socket functions
1427 */
1428static int bcm_release(struct socket *sock)
1429{
1430 struct sock *sk = sock->sk;
Dave Jonesc6914a62011-04-19 20:36:59 -07001431 struct bcm_sock *bo;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001432 struct bcm_op *op, *next;
1433
Dave Jonesc6914a62011-04-19 20:36:59 -07001434 if (sk == NULL)
1435 return 0;
1436
1437 bo = bcm_sk(sk);
1438
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001439 /* remove bcm_ops, timer, rx_unregister(), etc. */
1440
1441 unregister_netdevice_notifier(&bo->notifier);
1442
1443 lock_sock(sk);
1444
1445 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1446 bcm_remove_op(op);
1447
1448 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1449 /*
1450 * Don't care if we're bound or not (due to netdev problems)
1451 * can_rx_unregister() is always a save thing to do here.
1452 */
1453 if (op->ifindex) {
1454 /*
1455 * Only remove subscriptions that had not
1456 * been removed due to NETDEV_UNREGISTER
1457 * in bcm_notifier()
1458 */
1459 if (op->rx_reg_dev) {
1460 struct net_device *dev;
1461
1462 dev = dev_get_by_index(&init_net, op->ifindex);
1463 if (dev) {
1464 bcm_rx_unreg(dev, op);
1465 dev_put(dev);
1466 }
1467 }
1468 } else
1469 can_rx_unregister(NULL, op->can_id,
1470 REGMASK(op->can_id),
1471 bcm_rx_handler, op);
1472
1473 bcm_remove_op(op);
1474 }
1475
1476 /* remove procfs entry */
1477 if (proc_dir && bo->bcm_proc_read)
1478 remove_proc_entry(bo->procname, proc_dir);
1479
1480 /* remove device reference */
1481 if (bo->bound) {
1482 bo->bound = 0;
1483 bo->ifindex = 0;
1484 }
1485
Lothar Waßmannf7e5cc02009-07-14 23:10:21 +00001486 sock_orphan(sk);
1487 sock->sk = NULL;
1488
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001489 release_sock(sk);
1490 sock_put(sk);
1491
1492 return 0;
1493}
1494
1495static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1496 int flags)
1497{
1498 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1499 struct sock *sk = sock->sk;
1500 struct bcm_sock *bo = bcm_sk(sk);
1501
Changli Gao6503d962010-03-31 22:58:26 +00001502 if (len < sizeof(*addr))
1503 return -EINVAL;
1504
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001505 if (bo->bound)
1506 return -EISCONN;
1507
1508 /* bind a device to this socket */
1509 if (addr->can_ifindex) {
1510 struct net_device *dev;
1511
1512 dev = dev_get_by_index(&init_net, addr->can_ifindex);
1513 if (!dev)
1514 return -ENODEV;
1515
1516 if (dev->type != ARPHRD_CAN) {
1517 dev_put(dev);
1518 return -ENODEV;
1519 }
1520
1521 bo->ifindex = dev->ifindex;
1522 dev_put(dev);
1523
1524 } else {
1525 /* no interface reference for ifindex = 0 ('any' CAN device) */
1526 bo->ifindex = 0;
1527 }
1528
1529 bo->bound = 1;
1530
1531 if (proc_dir) {
1532 /* unique socket address as filename */
Dan Rosenberg9f260e02010-12-26 06:54:53 +00001533 sprintf(bo->procname, "%lu", sock_i_ino(sk));
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +00001534 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1535 proc_dir,
1536 &bcm_proc_fops, sk);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001537 }
1538
1539 return 0;
1540}
1541
1542static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock,
1543 struct msghdr *msg, size_t size, int flags)
1544{
1545 struct sock *sk = sock->sk;
1546 struct sk_buff *skb;
1547 int error = 0;
1548 int noblock;
1549 int err;
1550
1551 noblock = flags & MSG_DONTWAIT;
1552 flags &= ~MSG_DONTWAIT;
1553 skb = skb_recv_datagram(sk, flags, noblock, &error);
1554 if (!skb)
1555 return error;
1556
1557 if (skb->len < size)
1558 size = skb->len;
1559
1560 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
1561 if (err < 0) {
1562 skb_free_datagram(sk, skb);
1563 return err;
1564 }
1565
Neil Horman3b885782009-10-12 13:26:31 -07001566 sock_recv_ts_and_drops(msg, sk, skb);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001567
1568 if (msg->msg_name) {
1569 msg->msg_namelen = sizeof(struct sockaddr_can);
1570 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1571 }
1572
1573 skb_free_datagram(sk, skb);
1574
1575 return size;
1576}
1577
Oliver Hartkopp53914b62011-03-22 08:27:25 +00001578static const struct proto_ops bcm_ops = {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001579 .family = PF_CAN,
1580 .release = bcm_release,
1581 .bind = sock_no_bind,
1582 .connect = bcm_connect,
1583 .socketpair = sock_no_socketpair,
1584 .accept = sock_no_accept,
1585 .getname = sock_no_getname,
1586 .poll = datagram_poll,
Oliver Hartkopp53914b62011-03-22 08:27:25 +00001587 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001588 .listen = sock_no_listen,
1589 .shutdown = sock_no_shutdown,
1590 .setsockopt = sock_no_setsockopt,
1591 .getsockopt = sock_no_getsockopt,
1592 .sendmsg = bcm_sendmsg,
1593 .recvmsg = bcm_recvmsg,
1594 .mmap = sock_no_mmap,
1595 .sendpage = sock_no_sendpage,
1596};
1597
1598static struct proto bcm_proto __read_mostly = {
1599 .name = "CAN_BCM",
1600 .owner = THIS_MODULE,
1601 .obj_size = sizeof(struct bcm_sock),
1602 .init = bcm_init,
1603};
1604
Kurt Van Dijck16506292011-05-03 18:40:57 +00001605static const struct can_proto bcm_can_proto = {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001606 .type = SOCK_DGRAM,
1607 .protocol = CAN_BCM,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001608 .ops = &bcm_ops,
1609 .prot = &bcm_proto,
1610};
1611
1612static int __init bcm_module_init(void)
1613{
1614 int err;
1615
1616 printk(banner);
1617
1618 err = can_proto_register(&bcm_can_proto);
1619 if (err < 0) {
1620 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1621 return err;
1622 }
1623
1624 /* create /proc/net/can-bcm directory */
1625 proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001626 return 0;
1627}
1628
1629static void __exit bcm_module_exit(void)
1630{
1631 can_proto_unregister(&bcm_can_proto);
1632
1633 if (proc_dir)
1634 proc_net_remove(&init_net, "can-bcm");
1635}
1636
1637module_init(bcm_module_init);
1638module_exit(bcm_module_exit);