blob: dcb75c0e66c1b69979a88c65efe43084046f8bc2 [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 *
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080040 */
41
42#include <linux/module.h>
43#include <linux/init.h>
Alexey Dobriyana6b7a402011-06-06 10:43:46 +000044#include <linux/interrupt.h>
Oliver Hartkopp73e87e02008-04-15 19:29:14 -070045#include <linux/hrtimer.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080046#include <linux/list.h>
47#include <linux/proc_fs.h>
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +000048#include <linux/seq_file.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080049#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>
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +010057#include <linux/can/skb.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080058#include <linux/can/bcm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090059#include <linux/slab.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080060#include <net/sock.h>
61#include <net/net_namespace.h>
62
Oliver Hartkopp5b75c492010-08-11 16:12:35 -070063/*
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
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080070/* use of last_frames[index].can_dlc */
71#define RX_RECV 0x40 /* received data for this element */
72#define RX_THR 0x80 /* element not been sent due to throttle feature */
73#define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */
74
75/* get best masking value for can_rx_register() for a given single can_id */
Oliver Hartkoppd253eee2008-12-03 15:52:35 -080076#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))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080079
Oliver Hartkoppd253eee2008-12-03 15:52:35 -080080#define CAN_BCM_VERSION CAN_VERSION
Andi Kleen6299b662012-10-04 17:12:08 -070081static __initconst const char banner[] = KERN_INFO
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -080082 "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n";
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080083
84MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
85MODULE_LICENSE("Dual BSD/GPL");
86MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
Lothar Waßmannb13bb2e2009-07-14 23:12:25 +000087MODULE_ALIAS("can-proto-2");
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080088
89/* easy access to can_frame payload */
90static inline u64 GET_U64(const struct can_frame *cp)
91{
92 return *(u64 *)cp->data;
93}
94
95struct bcm_op {
96 struct list_head list;
97 int ifindex;
98 canid_t can_id;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -070099 u32 flags;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800100 unsigned long frames_abs, frames_filtered;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800101 struct timeval ival1, ival2;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700102 struct hrtimer timer, thrtimer;
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800103 struct tasklet_struct tsklet, thrtsklet;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700104 ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800105 int rx_ifindex;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700106 u32 count;
107 u32 nframes;
108 u32 currframe;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800109 struct can_frame *frames;
110 struct can_frame *last_frames;
111 struct can_frame sframe;
112 struct can_frame last_sframe;
113 struct sock *sk;
114 struct net_device *rx_reg_dev;
115};
116
117static struct proc_dir_entry *proc_dir;
118
119struct bcm_sock {
120 struct sock sk;
121 int bound;
122 int ifindex;
123 struct notifier_block notifier;
124 struct list_head rx_ops;
125 struct list_head tx_ops;
126 unsigned long dropped_usr_msgs;
127 struct proc_dir_entry *bcm_proc_read;
Dan Rosenberg9f260e02010-12-26 06:54:53 +0000128 char procname [32]; /* inode number in decimal with \0 */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800129};
130
131static inline struct bcm_sock *bcm_sk(const struct sock *sk)
132{
133 return (struct bcm_sock *)sk;
134}
135
136#define CFSIZ sizeof(struct can_frame)
137#define OPSIZ sizeof(struct bcm_op)
138#define MHSIZ sizeof(struct bcm_msg_head)
139
140/*
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800141 * procfs functions
142 */
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000143static char *bcm_proc_getifname(char *result, int ifindex)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800144{
145 struct net_device *dev;
146
147 if (!ifindex)
148 return "any";
149
stephen hemmingerff879eb2009-11-10 07:54:56 +0000150 rcu_read_lock();
151 dev = dev_get_by_index_rcu(&init_net, ifindex);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800152 if (dev)
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000153 strcpy(result, dev->name);
154 else
155 strcpy(result, "???");
stephen hemmingerff879eb2009-11-10 07:54:56 +0000156 rcu_read_unlock();
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800157
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000158 return result;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800159}
160
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000161static int bcm_proc_show(struct seq_file *m, void *v)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800162{
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000163 char ifname[IFNAMSIZ];
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000164 struct sock *sk = (struct sock *)m->private;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800165 struct bcm_sock *bo = bcm_sk(sk);
166 struct bcm_op *op;
167
Dan Rosenberg71338aa2011-05-23 12:17:35 +0000168 seq_printf(m, ">>> socket %pK", sk->sk_socket);
169 seq_printf(m, " / sk %pK", sk);
170 seq_printf(m, " / bo %pK", bo);
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000171 seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs);
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000172 seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex));
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000173 seq_printf(m, " <<<\n");
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800174
175 list_for_each_entry(op, &bo->rx_ops, list) {
176
177 unsigned long reduction;
178
179 /* print only active entries & prevent division by zero */
180 if (!op->frames_abs)
181 continue;
182
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000183 seq_printf(m, "rx_op: %03X %-5s ",
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000184 op->can_id, bcm_proc_getifname(ifname, op->ifindex));
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700185 seq_printf(m, "[%u]%c ", op->nframes,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800186 (op->flags & RX_CHECK_DLC)?'d':' ');
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700187 if (op->kt_ival1.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000188 seq_printf(m, "timeo=%lld ",
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700189 (long long)
190 ktime_to_us(op->kt_ival1));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800191
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700192 if (op->kt_ival2.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000193 seq_printf(m, "thr=%lld ",
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700194 (long long)
195 ktime_to_us(op->kt_ival2));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800196
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000197 seq_printf(m, "# recv %ld (%ld) => reduction: ",
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800198 op->frames_filtered, op->frames_abs);
199
200 reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
201
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000202 seq_printf(m, "%s%ld%%\n",
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800203 (reduction == 100)?"near ":"", reduction);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800204 }
205
206 list_for_each_entry(op, &bo->tx_ops, list) {
207
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700208 seq_printf(m, "tx_op: %03X %s [%u] ",
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000209 op->can_id,
210 bcm_proc_getifname(ifname, op->ifindex),
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800211 op->nframes);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800212
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700213 if (op->kt_ival1.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000214 seq_printf(m, "t1=%lld ",
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700215 (long long) ktime_to_us(op->kt_ival1));
216
217 if (op->kt_ival2.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000218 seq_printf(m, "t2=%lld ",
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700219 (long long) ktime_to_us(op->kt_ival2));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800220
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000221 seq_printf(m, "# sent %ld\n", op->frames_abs);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800222 }
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000223 seq_putc(m, '\n');
224 return 0;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800225}
226
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000227static int bcm_proc_open(struct inode *inode, struct file *file)
228{
Al Virod9dda782013-03-31 18:16:14 -0400229 return single_open(file, bcm_proc_show, PDE_DATA(inode));
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000230}
231
232static const struct file_operations bcm_proc_fops = {
233 .owner = THIS_MODULE,
234 .open = bcm_proc_open,
235 .read = seq_read,
236 .llseek = seq_lseek,
237 .release = single_release,
238};
239
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800240/*
241 * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface
242 * of the given bcm tx op
243 */
244static void bcm_can_tx(struct bcm_op *op)
245{
246 struct sk_buff *skb;
247 struct net_device *dev;
248 struct can_frame *cf = &op->frames[op->currframe];
249
250 /* no target device? => exit */
251 if (!op->ifindex)
252 return;
253
254 dev = dev_get_by_index(&init_net, op->ifindex);
255 if (!dev) {
256 /* RFC: should this bcm_op remove itself here? */
257 return;
258 }
259
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +0100260 skb = alloc_skb(CFSIZ + sizeof(struct can_skb_priv), gfp_any());
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800261 if (!skb)
262 goto out;
263
Oliver Hartkopp2bf34402013-01-28 08:33:33 +0000264 can_skb_reserve(skb);
265 can_skb_prv(skb)->ifindex = dev->ifindex;
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +0100266
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800267 memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
268
269 /* send with loopback */
270 skb->dev = dev;
Oliver Hartkopp0ae89be2014-01-30 10:11:28 +0100271 can_skb_set_owner(skb, op->sk);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800272 can_send(skb, 1);
273
274 /* update statistics */
275 op->currframe++;
276 op->frames_abs++;
277
278 /* reached last frame? */
279 if (op->currframe >= op->nframes)
280 op->currframe = 0;
281 out:
282 dev_put(dev);
283}
284
285/*
286 * bcm_send_to_user - send a BCM message to the userspace
287 * (consisting of bcm_msg_head + x CAN frames)
288 */
289static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
290 struct can_frame *frames, int has_timestamp)
291{
292 struct sk_buff *skb;
293 struct can_frame *firstframe;
294 struct sockaddr_can *addr;
295 struct sock *sk = op->sk;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700296 unsigned int datalen = head->nframes * CFSIZ;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800297 int err;
298
299 skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
300 if (!skb)
301 return;
302
303 memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
304
305 if (head->nframes) {
306 /* can_frames starting here */
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700307 firstframe = (struct can_frame *)skb_tail_pointer(skb);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800308
309 memcpy(skb_put(skb, datalen), frames, datalen);
310
311 /*
312 * the BCM uses the can_dlc-element of the can_frame
313 * structure for internal purposes. This is only
314 * relevant for updates that are generated by the
315 * BCM, where nframes is 1
316 */
317 if (head->nframes == 1)
318 firstframe->can_dlc &= BCM_CAN_DLC_MASK;
319 }
320
321 if (has_timestamp) {
322 /* restore rx timestamp */
323 skb->tstamp = op->rx_stamp;
324 }
325
326 /*
327 * Put the datagram to the queue so that bcm_recvmsg() can
328 * get it from there. We need to pass the interface index to
329 * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
330 * containing the interface index.
331 */
332
333 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
334 addr = (struct sockaddr_can *)skb->cb;
335 memset(addr, 0, sizeof(*addr));
336 addr->can_family = AF_CAN;
337 addr->can_ifindex = op->rx_ifindex;
338
339 err = sock_queue_rcv_skb(sk, skb);
340 if (err < 0) {
341 struct bcm_sock *bo = bcm_sk(sk);
342
343 kfree_skb(skb);
344 /* don't care about overflows in this statistic */
345 bo->dropped_usr_msgs++;
346 }
347}
348
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400349static void bcm_tx_start_timer(struct bcm_op *op)
350{
351 if (op->kt_ival1.tv64 && op->count)
352 hrtimer_start(&op->timer,
353 ktime_add(ktime_get(), op->kt_ival1),
354 HRTIMER_MODE_ABS);
355 else if (op->kt_ival2.tv64)
356 hrtimer_start(&op->timer,
357 ktime_add(ktime_get(), op->kt_ival2),
358 HRTIMER_MODE_ABS);
359}
360
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800361static void bcm_tx_timeout_tsklet(unsigned long data)
362{
363 struct bcm_op *op = (struct bcm_op *)data;
364 struct bcm_msg_head msg_head;
365
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800366 if (op->kt_ival1.tv64 && (op->count > 0)) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800367
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800368 op->count--;
369 if (!op->count && (op->flags & TX_COUNTEVT)) {
370
371 /* create notification to user */
372 msg_head.opcode = TX_EXPIRED;
373 msg_head.flags = op->flags;
374 msg_head.count = op->count;
375 msg_head.ival1 = op->ival1;
376 msg_head.ival2 = op->ival2;
377 msg_head.can_id = op->can_id;
378 msg_head.nframes = 0;
379
380 bcm_send_to_user(op, &msg_head, NULL, 0);
381 }
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800382 bcm_can_tx(op);
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800383
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400384 } else if (op->kt_ival2.tv64)
385 bcm_can_tx(op);
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800386
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400387 bcm_tx_start_timer(op);
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
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400967 if (op->flags & STARTTIMER) {
968 hrtimer_cancel(&op->timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800969 /* spec: send can_frame when starting timer */
970 op->flags |= TX_ANNOUNCE;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800971 }
972
Oliver Hartkoppaabdcb02011-09-23 08:23:47 +0000973 if (op->flags & TX_ANNOUNCE) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800974 bcm_can_tx(op);
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400975 if (op->count)
Oliver Hartkoppaabdcb02011-09-23 08:23:47 +0000976 op->count--;
977 }
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800978
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400979 if (op->flags & STARTTIMER)
980 bcm_tx_start_timer(op);
981
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800982 return msg_head->nframes * CFSIZ + MHSIZ;
983}
984
985/*
986 * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg)
987 */
988static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
989 int ifindex, struct sock *sk)
990{
991 struct bcm_sock *bo = bcm_sk(sk);
992 struct bcm_op *op;
993 int do_rx_register;
994 int err = 0;
995
996 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
997 /* be robust against wrong usage ... */
998 msg_head->flags |= RX_FILTER_ID;
999 /* ignore trailing garbage */
1000 msg_head->nframes = 0;
1001 }
1002
Oliver Hartkopp5b75c492010-08-11 16:12:35 -07001003 /* the first element contains the mux-mask => MAX_NFRAMES + 1 */
1004 if (msg_head->nframes > MAX_NFRAMES + 1)
1005 return -EINVAL;
1006
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001007 if ((msg_head->flags & RX_RTR_FRAME) &&
1008 ((msg_head->nframes != 1) ||
1009 (!(msg_head->can_id & CAN_RTR_FLAG))))
1010 return -EINVAL;
1011
1012 /* check the given can_id */
1013 op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex);
1014 if (op) {
1015 /* update existing BCM operation */
1016
1017 /*
1018 * Do we need more space for the can_frames than currently
1019 * allocated? -> This is a _really_ unusual use-case and
1020 * therefore (complexity / locking) it is not supported.
1021 */
1022 if (msg_head->nframes > op->nframes)
1023 return -E2BIG;
1024
1025 if (msg_head->nframes) {
1026 /* update can_frames content */
1027 err = memcpy_fromiovec((u8 *)op->frames,
1028 msg->msg_iov,
1029 msg_head->nframes * CFSIZ);
1030 if (err < 0)
1031 return err;
1032
1033 /* clear last_frames to indicate 'nothing received' */
1034 memset(op->last_frames, 0, msg_head->nframes * CFSIZ);
1035 }
1036
1037 op->nframes = msg_head->nframes;
1038
1039 /* Only an update -> do not call can_rx_register() */
1040 do_rx_register = 0;
1041
1042 } else {
1043 /* insert new BCM operation for the given can_id */
1044 op = kzalloc(OPSIZ, GFP_KERNEL);
1045 if (!op)
1046 return -ENOMEM;
1047
1048 op->can_id = msg_head->can_id;
1049 op->nframes = msg_head->nframes;
1050
1051 if (msg_head->nframes > 1) {
1052 /* create array for can_frames and copy the data */
1053 op->frames = kmalloc(msg_head->nframes * CFSIZ,
1054 GFP_KERNEL);
1055 if (!op->frames) {
1056 kfree(op);
1057 return -ENOMEM;
1058 }
1059
1060 /* create and init array for received can_frames */
1061 op->last_frames = kzalloc(msg_head->nframes * CFSIZ,
1062 GFP_KERNEL);
1063 if (!op->last_frames) {
1064 kfree(op->frames);
1065 kfree(op);
1066 return -ENOMEM;
1067 }
1068
1069 } else {
1070 op->frames = &op->sframe;
1071 op->last_frames = &op->last_sframe;
1072 }
1073
1074 if (msg_head->nframes) {
1075 err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov,
1076 msg_head->nframes * CFSIZ);
1077 if (err < 0) {
1078 if (op->frames != &op->sframe)
1079 kfree(op->frames);
1080 if (op->last_frames != &op->last_sframe)
1081 kfree(op->last_frames);
1082 kfree(op);
1083 return err;
1084 }
1085 }
1086
1087 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
1088 op->sk = sk;
1089 op->ifindex = ifindex;
1090
Oliver Hartkopp81b40112012-11-26 22:24:23 +01001091 /* ifindex for timeout events w/o previous frame reception */
1092 op->rx_ifindex = ifindex;
1093
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001094 /* 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
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +01001206 skb = alloc_skb(CFSIZ + sizeof(struct can_skb_priv), GFP_KERNEL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001207 if (!skb)
1208 return -ENOMEM;
1209
Oliver Hartkopp2bf34402013-01-28 08:33:33 +00001210 can_skb_reserve(skb);
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +01001211
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001212 err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
1213 if (err < 0) {
1214 kfree_skb(skb);
1215 return err;
1216 }
1217
1218 dev = dev_get_by_index(&init_net, ifindex);
1219 if (!dev) {
1220 kfree_skb(skb);
1221 return -ENODEV;
1222 }
1223
Oliver Hartkopp2bf34402013-01-28 08:33:33 +00001224 can_skb_prv(skb)->ifindex = dev->ifindex;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001225 skb->dev = dev;
Oliver Hartkopp0ae89be2014-01-30 10:11:28 +01001226 can_skb_set_owner(skb, sk);
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001227 err = can_send(skb, 1); /* send with loopback */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001228 dev_put(dev);
1229
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001230 if (err)
1231 return err;
1232
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001233 return CFSIZ + MHSIZ;
1234}
1235
1236/*
1237 * bcm_sendmsg - process BCM commands (opcodes) from the userspace
1238 */
1239static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock,
1240 struct msghdr *msg, size_t size)
1241{
1242 struct sock *sk = sock->sk;
1243 struct bcm_sock *bo = bcm_sk(sk);
1244 int ifindex = bo->ifindex; /* default ifindex for this bcm_op */
1245 struct bcm_msg_head msg_head;
1246 int ret; /* read bytes or error codes as return value */
1247
1248 if (!bo->bound)
1249 return -ENOTCONN;
1250
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001251 /* check for valid message length from userspace */
1252 if (size < MHSIZ || (size - MHSIZ) % CFSIZ)
1253 return -EINVAL;
1254
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001255 /* check for alternative ifindex for this bcm_op */
1256
1257 if (!ifindex && msg->msg_name) {
1258 /* no bound device as default => check msg_name */
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001259 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001260
Kurt Van Dijck5e5073282011-01-15 20:56:42 -08001261 if (msg->msg_namelen < sizeof(*addr))
1262 return -EINVAL;
1263
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001264 if (addr->can_family != AF_CAN)
1265 return -EINVAL;
1266
1267 /* ifindex from sendto() */
1268 ifindex = addr->can_ifindex;
1269
1270 if (ifindex) {
1271 struct net_device *dev;
1272
1273 dev = dev_get_by_index(&init_net, ifindex);
1274 if (!dev)
1275 return -ENODEV;
1276
1277 if (dev->type != ARPHRD_CAN) {
1278 dev_put(dev);
1279 return -ENODEV;
1280 }
1281
1282 dev_put(dev);
1283 }
1284 }
1285
1286 /* read message head information */
1287
1288 ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ);
1289 if (ret < 0)
1290 return ret;
1291
1292 lock_sock(sk);
1293
1294 switch (msg_head.opcode) {
1295
1296 case TX_SETUP:
1297 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1298 break;
1299
1300 case RX_SETUP:
1301 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1302 break;
1303
1304 case TX_DELETE:
1305 if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex))
1306 ret = MHSIZ;
1307 else
1308 ret = -EINVAL;
1309 break;
1310
1311 case RX_DELETE:
1312 if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex))
1313 ret = MHSIZ;
1314 else
1315 ret = -EINVAL;
1316 break;
1317
1318 case TX_READ:
1319 /* reuse msg_head for the reply to TX_READ */
1320 msg_head.opcode = TX_STATUS;
1321 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1322 break;
1323
1324 case RX_READ:
1325 /* reuse msg_head for the reply to RX_READ */
1326 msg_head.opcode = RX_STATUS;
1327 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1328 break;
1329
1330 case TX_SEND:
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001331 /* we need exactly one can_frame behind the msg head */
1332 if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001333 ret = -EINVAL;
1334 else
1335 ret = bcm_tx_send(msg, ifindex, sk);
1336 break;
1337
1338 default:
1339 ret = -EINVAL;
1340 break;
1341 }
1342
1343 release_sock(sk);
1344
1345 return ret;
1346}
1347
1348/*
1349 * notification handler for netdevice status changes
1350 */
1351static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
Jiri Pirko351638e2013-05-28 01:30:21 +00001352 void *ptr)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001353{
Jiri Pirko351638e2013-05-28 01:30:21 +00001354 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001355 struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
1356 struct sock *sk = &bo->sk;
1357 struct bcm_op *op;
1358 int notify_enodev = 0;
1359
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -07001360 if (!net_eq(dev_net(dev), &init_net))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001361 return NOTIFY_DONE;
1362
1363 if (dev->type != ARPHRD_CAN)
1364 return NOTIFY_DONE;
1365
1366 switch (msg) {
1367
1368 case NETDEV_UNREGISTER:
1369 lock_sock(sk);
1370
1371 /* remove device specific receive entries */
1372 list_for_each_entry(op, &bo->rx_ops, list)
1373 if (op->rx_reg_dev == dev)
1374 bcm_rx_unreg(dev, op);
1375
1376 /* remove device reference, if this is our bound device */
1377 if (bo->bound && bo->ifindex == dev->ifindex) {
1378 bo->bound = 0;
1379 bo->ifindex = 0;
1380 notify_enodev = 1;
1381 }
1382
1383 release_sock(sk);
1384
1385 if (notify_enodev) {
1386 sk->sk_err = ENODEV;
1387 if (!sock_flag(sk, SOCK_DEAD))
1388 sk->sk_error_report(sk);
1389 }
1390 break;
1391
1392 case NETDEV_DOWN:
1393 if (bo->bound && bo->ifindex == dev->ifindex) {
1394 sk->sk_err = ENETDOWN;
1395 if (!sock_flag(sk, SOCK_DEAD))
1396 sk->sk_error_report(sk);
1397 }
1398 }
1399
1400 return NOTIFY_DONE;
1401}
1402
1403/*
1404 * initial settings for all BCM sockets to be set at socket creation time
1405 */
1406static int bcm_init(struct sock *sk)
1407{
1408 struct bcm_sock *bo = bcm_sk(sk);
1409
1410 bo->bound = 0;
1411 bo->ifindex = 0;
1412 bo->dropped_usr_msgs = 0;
1413 bo->bcm_proc_read = NULL;
1414
1415 INIT_LIST_HEAD(&bo->tx_ops);
1416 INIT_LIST_HEAD(&bo->rx_ops);
1417
1418 /* set notifier */
1419 bo->notifier.notifier_call = bcm_notifier;
1420
1421 register_netdevice_notifier(&bo->notifier);
1422
1423 return 0;
1424}
1425
1426/*
1427 * standard socket functions
1428 */
1429static int bcm_release(struct socket *sock)
1430{
1431 struct sock *sk = sock->sk;
Dave Jonesc6914a62011-04-19 20:36:59 -07001432 struct bcm_sock *bo;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001433 struct bcm_op *op, *next;
1434
Dave Jonesc6914a62011-04-19 20:36:59 -07001435 if (sk == NULL)
1436 return 0;
1437
1438 bo = bcm_sk(sk);
1439
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001440 /* remove bcm_ops, timer, rx_unregister(), etc. */
1441
1442 unregister_netdevice_notifier(&bo->notifier);
1443
1444 lock_sock(sk);
1445
1446 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1447 bcm_remove_op(op);
1448
1449 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1450 /*
1451 * Don't care if we're bound or not (due to netdev problems)
1452 * can_rx_unregister() is always a save thing to do here.
1453 */
1454 if (op->ifindex) {
1455 /*
1456 * Only remove subscriptions that had not
1457 * been removed due to NETDEV_UNREGISTER
1458 * in bcm_notifier()
1459 */
1460 if (op->rx_reg_dev) {
1461 struct net_device *dev;
1462
1463 dev = dev_get_by_index(&init_net, op->ifindex);
1464 if (dev) {
1465 bcm_rx_unreg(dev, op);
1466 dev_put(dev);
1467 }
1468 }
1469 } else
1470 can_rx_unregister(NULL, op->can_id,
1471 REGMASK(op->can_id),
1472 bcm_rx_handler, op);
1473
1474 bcm_remove_op(op);
1475 }
1476
1477 /* remove procfs entry */
1478 if (proc_dir && bo->bcm_proc_read)
1479 remove_proc_entry(bo->procname, proc_dir);
1480
1481 /* remove device reference */
1482 if (bo->bound) {
1483 bo->bound = 0;
1484 bo->ifindex = 0;
1485 }
1486
Lothar Waßmannf7e5cc02009-07-14 23:10:21 +00001487 sock_orphan(sk);
1488 sock->sk = NULL;
1489
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001490 release_sock(sk);
1491 sock_put(sk);
1492
1493 return 0;
1494}
1495
1496static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1497 int flags)
1498{
1499 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1500 struct sock *sk = sock->sk;
1501 struct bcm_sock *bo = bcm_sk(sk);
1502
Changli Gao6503d962010-03-31 22:58:26 +00001503 if (len < sizeof(*addr))
1504 return -EINVAL;
1505
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001506 if (bo->bound)
1507 return -EISCONN;
1508
1509 /* bind a device to this socket */
1510 if (addr->can_ifindex) {
1511 struct net_device *dev;
1512
1513 dev = dev_get_by_index(&init_net, addr->can_ifindex);
1514 if (!dev)
1515 return -ENODEV;
1516
1517 if (dev->type != ARPHRD_CAN) {
1518 dev_put(dev);
1519 return -ENODEV;
1520 }
1521
1522 bo->ifindex = dev->ifindex;
1523 dev_put(dev);
1524
1525 } else {
1526 /* no interface reference for ifindex = 0 ('any' CAN device) */
1527 bo->ifindex = 0;
1528 }
1529
1530 bo->bound = 1;
1531
1532 if (proc_dir) {
1533 /* unique socket address as filename */
Dan Rosenberg9f260e02010-12-26 06:54:53 +00001534 sprintf(bo->procname, "%lu", sock_i_ino(sk));
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +00001535 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1536 proc_dir,
1537 &bcm_proc_fops, sk);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001538 }
1539
1540 return 0;
1541}
1542
1543static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock,
1544 struct msghdr *msg, size_t size, int flags)
1545{
1546 struct sock *sk = sock->sk;
1547 struct sk_buff *skb;
1548 int error = 0;
1549 int noblock;
1550 int err;
1551
1552 noblock = flags & MSG_DONTWAIT;
1553 flags &= ~MSG_DONTWAIT;
1554 skb = skb_recv_datagram(sk, flags, noblock, &error);
1555 if (!skb)
1556 return error;
1557
1558 if (skb->len < size)
1559 size = skb->len;
1560
1561 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
1562 if (err < 0) {
1563 skb_free_datagram(sk, skb);
1564 return err;
1565 }
1566
Neil Horman3b885782009-10-12 13:26:31 -07001567 sock_recv_ts_and_drops(msg, sk, skb);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001568
1569 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001570 __sockaddr_check_size(sizeof(struct sockaddr_can));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001571 msg->msg_namelen = sizeof(struct sockaddr_can);
1572 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1573 }
1574
1575 skb_free_datagram(sk, skb);
1576
1577 return size;
1578}
1579
Oliver Hartkopp53914b62011-03-22 08:27:25 +00001580static const struct proto_ops bcm_ops = {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001581 .family = PF_CAN,
1582 .release = bcm_release,
1583 .bind = sock_no_bind,
1584 .connect = bcm_connect,
1585 .socketpair = sock_no_socketpair,
1586 .accept = sock_no_accept,
1587 .getname = sock_no_getname,
1588 .poll = datagram_poll,
Oliver Hartkopp53914b62011-03-22 08:27:25 +00001589 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001590 .listen = sock_no_listen,
1591 .shutdown = sock_no_shutdown,
1592 .setsockopt = sock_no_setsockopt,
1593 .getsockopt = sock_no_getsockopt,
1594 .sendmsg = bcm_sendmsg,
1595 .recvmsg = bcm_recvmsg,
1596 .mmap = sock_no_mmap,
1597 .sendpage = sock_no_sendpage,
1598};
1599
1600static struct proto bcm_proto __read_mostly = {
1601 .name = "CAN_BCM",
1602 .owner = THIS_MODULE,
1603 .obj_size = sizeof(struct bcm_sock),
1604 .init = bcm_init,
1605};
1606
Kurt Van Dijck16506292011-05-03 18:40:57 +00001607static const struct can_proto bcm_can_proto = {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001608 .type = SOCK_DGRAM,
1609 .protocol = CAN_BCM,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001610 .ops = &bcm_ops,
1611 .prot = &bcm_proto,
1612};
1613
1614static int __init bcm_module_init(void)
1615{
1616 int err;
1617
1618 printk(banner);
1619
1620 err = can_proto_register(&bcm_can_proto);
1621 if (err < 0) {
1622 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1623 return err;
1624 }
1625
1626 /* create /proc/net/can-bcm directory */
1627 proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001628 return 0;
1629}
1630
1631static void __exit bcm_module_exit(void)
1632{
1633 can_proto_unregister(&bcm_can_proto);
1634
1635 if (proc_dir)
Gao fengece31ff2013-02-18 01:34:56 +00001636 remove_proc_entry("can-bcm", init_net.proc_net);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001637}
1638
1639module_init(bcm_module_init);
1640module_exit(bcm_module_exit);