Linux 3.0-rc7
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / can / bcm.c
blob184a6572b67e6be824ba1ef30b122d065269a262
1 /*
2 * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content
4 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
5 * All rights reserved.
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.
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.
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.
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.
40 * Send feedback to <socketcan-users@lists.berlios.de>
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/hrtimer.h>
47 #include <linux/list.h>
48 #include <linux/proc_fs.h>
49 #include <linux/seq_file.h>
50 #include <linux/uio.h>
51 #include <linux/net.h>
52 #include <linux/netdevice.h>
53 #include <linux/socket.h>
54 #include <linux/if_arp.h>
55 #include <linux/skbuff.h>
56 #include <linux/can.h>
57 #include <linux/can/core.h>
58 #include <linux/can/bcm.h>
59 #include <linux/slab.h>
60 #include <net/sock.h>
61 #include <net/net_namespace.h>
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.
68 #define MAX_NFRAMES 256
70 /* 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 */
75 /* get best masking value for can_rx_register() for a given single can_id */
76 #define REGMASK(id) ((id & CAN_EFF_FLAG) ? \
77 (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \
78 (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG))
80 #define CAN_BCM_VERSION CAN_VERSION
81 static __initdata const char banner[] = KERN_INFO
82 "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n";
84 MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
85 MODULE_LICENSE("Dual BSD/GPL");
86 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
87 MODULE_ALIAS("can-proto-2");
89 /* easy access to can_frame payload */
90 static inline u64 GET_U64(const struct can_frame *cp)
92 return *(u64 *)cp->data;
95 struct bcm_op {
96 struct list_head list;
97 int ifindex;
98 canid_t can_id;
99 u32 flags;
100 unsigned long frames_abs, frames_filtered;
101 struct timeval ival1, ival2;
102 struct hrtimer timer, thrtimer;
103 struct tasklet_struct tsklet, thrtsklet;
104 ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg;
105 int rx_ifindex;
106 u32 count;
107 u32 nframes;
108 u32 currframe;
109 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;
117 static struct proc_dir_entry *proc_dir;
119 struct 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;
128 char procname [32]; /* inode number in decimal with \0 */
131 static inline struct bcm_sock *bcm_sk(const struct sock *sk)
133 return (struct bcm_sock *)sk;
136 #define CFSIZ sizeof(struct can_frame)
137 #define OPSIZ sizeof(struct bcm_op)
138 #define MHSIZ sizeof(struct bcm_msg_head)
141 * procfs functions
143 static char *bcm_proc_getifname(char *result, int ifindex)
145 struct net_device *dev;
147 if (!ifindex)
148 return "any";
150 rcu_read_lock();
151 dev = dev_get_by_index_rcu(&init_net, ifindex);
152 if (dev)
153 strcpy(result, dev->name);
154 else
155 strcpy(result, "???");
156 rcu_read_unlock();
158 return result;
161 static int bcm_proc_show(struct seq_file *m, void *v)
163 char ifname[IFNAMSIZ];
164 struct sock *sk = (struct sock *)m->private;
165 struct bcm_sock *bo = bcm_sk(sk);
166 struct bcm_op *op;
168 seq_printf(m, ">>> socket %pK", sk->sk_socket);
169 seq_printf(m, " / sk %pK", sk);
170 seq_printf(m, " / bo %pK", bo);
171 seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs);
172 seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex));
173 seq_printf(m, " <<<\n");
175 list_for_each_entry(op, &bo->rx_ops, list) {
177 unsigned long reduction;
179 /* print only active entries & prevent division by zero */
180 if (!op->frames_abs)
181 continue;
183 seq_printf(m, "rx_op: %03X %-5s ",
184 op->can_id, bcm_proc_getifname(ifname, op->ifindex));
185 seq_printf(m, "[%u]%c ", op->nframes,
186 (op->flags & RX_CHECK_DLC)?'d':' ');
187 if (op->kt_ival1.tv64)
188 seq_printf(m, "timeo=%lld ",
189 (long long)
190 ktime_to_us(op->kt_ival1));
192 if (op->kt_ival2.tv64)
193 seq_printf(m, "thr=%lld ",
194 (long long)
195 ktime_to_us(op->kt_ival2));
197 seq_printf(m, "# recv %ld (%ld) => reduction: ",
198 op->frames_filtered, op->frames_abs);
200 reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
202 seq_printf(m, "%s%ld%%\n",
203 (reduction == 100)?"near ":"", reduction);
206 list_for_each_entry(op, &bo->tx_ops, list) {
208 seq_printf(m, "tx_op: %03X %s [%u] ",
209 op->can_id,
210 bcm_proc_getifname(ifname, op->ifindex),
211 op->nframes);
213 if (op->kt_ival1.tv64)
214 seq_printf(m, "t1=%lld ",
215 (long long) ktime_to_us(op->kt_ival1));
217 if (op->kt_ival2.tv64)
218 seq_printf(m, "t2=%lld ",
219 (long long) ktime_to_us(op->kt_ival2));
221 seq_printf(m, "# sent %ld\n", op->frames_abs);
223 seq_putc(m, '\n');
224 return 0;
227 static int bcm_proc_open(struct inode *inode, struct file *file)
229 return single_open(file, bcm_proc_show, PDE(inode)->data);
232 static 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,
241 * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface
242 * of the given bcm tx op
244 static void bcm_can_tx(struct bcm_op *op)
246 struct sk_buff *skb;
247 struct net_device *dev;
248 struct can_frame *cf = &op->frames[op->currframe];
250 /* no target device? => exit */
251 if (!op->ifindex)
252 return;
254 dev = dev_get_by_index(&init_net, op->ifindex);
255 if (!dev) {
256 /* RFC: should this bcm_op remove itself here? */
257 return;
260 skb = alloc_skb(CFSIZ, gfp_any());
261 if (!skb)
262 goto out;
264 memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
266 /* send with loopback */
267 skb->dev = dev;
268 skb->sk = op->sk;
269 can_send(skb, 1);
271 /* update statistics */
272 op->currframe++;
273 op->frames_abs++;
275 /* reached last frame? */
276 if (op->currframe >= op->nframes)
277 op->currframe = 0;
278 out:
279 dev_put(dev);
283 * bcm_send_to_user - send a BCM message to the userspace
284 * (consisting of bcm_msg_head + x CAN frames)
286 static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
287 struct can_frame *frames, int has_timestamp)
289 struct sk_buff *skb;
290 struct can_frame *firstframe;
291 struct sockaddr_can *addr;
292 struct sock *sk = op->sk;
293 unsigned int datalen = head->nframes * CFSIZ;
294 int err;
296 skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
297 if (!skb)
298 return;
300 memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
302 if (head->nframes) {
303 /* can_frames starting here */
304 firstframe = (struct can_frame *)skb_tail_pointer(skb);
306 memcpy(skb_put(skb, datalen), frames, datalen);
309 * the BCM uses the can_dlc-element of the can_frame
310 * structure for internal purposes. This is only
311 * relevant for updates that are generated by the
312 * BCM, where nframes is 1
314 if (head->nframes == 1)
315 firstframe->can_dlc &= BCM_CAN_DLC_MASK;
318 if (has_timestamp) {
319 /* restore rx timestamp */
320 skb->tstamp = op->rx_stamp;
324 * Put the datagram to the queue so that bcm_recvmsg() can
325 * get it from there. We need to pass the interface index to
326 * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
327 * containing the interface index.
330 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
331 addr = (struct sockaddr_can *)skb->cb;
332 memset(addr, 0, sizeof(*addr));
333 addr->can_family = AF_CAN;
334 addr->can_ifindex = op->rx_ifindex;
336 err = sock_queue_rcv_skb(sk, skb);
337 if (err < 0) {
338 struct bcm_sock *bo = bcm_sk(sk);
340 kfree_skb(skb);
341 /* don't care about overflows in this statistic */
342 bo->dropped_usr_msgs++;
346 static void bcm_tx_timeout_tsklet(unsigned long data)
348 struct bcm_op *op = (struct bcm_op *)data;
349 struct bcm_msg_head msg_head;
351 if (op->kt_ival1.tv64 && (op->count > 0)) {
353 op->count--;
354 if (!op->count && (op->flags & TX_COUNTEVT)) {
356 /* create notification to user */
357 msg_head.opcode = TX_EXPIRED;
358 msg_head.flags = op->flags;
359 msg_head.count = op->count;
360 msg_head.ival1 = op->ival1;
361 msg_head.ival2 = op->ival2;
362 msg_head.can_id = op->can_id;
363 msg_head.nframes = 0;
365 bcm_send_to_user(op, &msg_head, NULL, 0);
369 if (op->kt_ival1.tv64 && (op->count > 0)) {
371 /* send (next) frame */
372 bcm_can_tx(op);
373 hrtimer_start(&op->timer,
374 ktime_add(ktime_get(), op->kt_ival1),
375 HRTIMER_MODE_ABS);
377 } else {
378 if (op->kt_ival2.tv64) {
380 /* send (next) frame */
381 bcm_can_tx(op);
382 hrtimer_start(&op->timer,
383 ktime_add(ktime_get(), op->kt_ival2),
384 HRTIMER_MODE_ABS);
390 * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions
392 static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer)
394 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
396 tasklet_schedule(&op->tsklet);
398 return HRTIMER_NORESTART;
402 * bcm_rx_changed - create a RX_CHANGED notification due to changed content
404 static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data)
406 struct bcm_msg_head head;
408 /* update statistics */
409 op->frames_filtered++;
411 /* prevent statistics overflow */
412 if (op->frames_filtered > ULONG_MAX/100)
413 op->frames_filtered = op->frames_abs = 0;
415 /* this element is not throttled anymore */
416 data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV);
418 head.opcode = RX_CHANGED;
419 head.flags = op->flags;
420 head.count = op->count;
421 head.ival1 = op->ival1;
422 head.ival2 = op->ival2;
423 head.can_id = op->can_id;
424 head.nframes = 1;
426 bcm_send_to_user(op, &head, data, 1);
430 * bcm_rx_update_and_send - process a detected relevant receive content change
431 * 1. update the last received data
432 * 2. send a notification to the user (if possible)
434 static void bcm_rx_update_and_send(struct bcm_op *op,
435 struct can_frame *lastdata,
436 const struct can_frame *rxdata)
438 memcpy(lastdata, rxdata, CFSIZ);
440 /* mark as used and throttled by default */
441 lastdata->can_dlc |= (RX_RECV|RX_THR);
443 /* throtteling mode inactive ? */
444 if (!op->kt_ival2.tv64) {
445 /* send RX_CHANGED to the user immediately */
446 bcm_rx_changed(op, lastdata);
447 return;
450 /* with active throttling timer we are just done here */
451 if (hrtimer_active(&op->thrtimer))
452 return;
454 /* first receiption with enabled throttling mode */
455 if (!op->kt_lastmsg.tv64)
456 goto rx_changed_settime;
458 /* got a second frame inside a potential throttle period? */
459 if (ktime_us_delta(ktime_get(), op->kt_lastmsg) <
460 ktime_to_us(op->kt_ival2)) {
461 /* do not send the saved data - only start throttle timer */
462 hrtimer_start(&op->thrtimer,
463 ktime_add(op->kt_lastmsg, op->kt_ival2),
464 HRTIMER_MODE_ABS);
465 return;
468 /* the gap was that big, that throttling was not needed here */
469 rx_changed_settime:
470 bcm_rx_changed(op, lastdata);
471 op->kt_lastmsg = ktime_get();
475 * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly
476 * received data stored in op->last_frames[]
478 static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index,
479 const struct can_frame *rxdata)
482 * no one uses the MSBs of can_dlc for comparation,
483 * so we use it here to detect the first time of reception
486 if (!(op->last_frames[index].can_dlc & RX_RECV)) {
487 /* received data for the first time => send update to user */
488 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
489 return;
492 /* do a real check in can_frame data section */
494 if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) !=
495 (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) {
496 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
497 return;
500 if (op->flags & RX_CHECK_DLC) {
501 /* do a real check in can_frame dlc */
502 if (rxdata->can_dlc != (op->last_frames[index].can_dlc &
503 BCM_CAN_DLC_MASK)) {
504 bcm_rx_update_and_send(op, &op->last_frames[index],
505 rxdata);
506 return;
512 * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption
514 static void bcm_rx_starttimer(struct bcm_op *op)
516 if (op->flags & RX_NO_AUTOTIMER)
517 return;
519 if (op->kt_ival1.tv64)
520 hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL);
523 static void bcm_rx_timeout_tsklet(unsigned long data)
525 struct bcm_op *op = (struct bcm_op *)data;
526 struct bcm_msg_head msg_head;
528 /* create notification to user */
529 msg_head.opcode = RX_TIMEOUT;
530 msg_head.flags = op->flags;
531 msg_head.count = op->count;
532 msg_head.ival1 = op->ival1;
533 msg_head.ival2 = op->ival2;
534 msg_head.can_id = op->can_id;
535 msg_head.nframes = 0;
537 bcm_send_to_user(op, &msg_head, NULL, 0);
541 * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out
543 static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer)
545 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
547 /* schedule before NET_RX_SOFTIRQ */
548 tasklet_hi_schedule(&op->tsklet);
550 /* no restart of the timer is done here! */
552 /* if user wants to be informed, when cyclic CAN-Messages come back */
553 if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) {
554 /* clear received can_frames to indicate 'nothing received' */
555 memset(op->last_frames, 0, op->nframes * CFSIZ);
558 return HRTIMER_NORESTART;
562 * bcm_rx_do_flush - helper for bcm_rx_thr_flush
564 static inline int bcm_rx_do_flush(struct bcm_op *op, int update,
565 unsigned int index)
567 if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) {
568 if (update)
569 bcm_rx_changed(op, &op->last_frames[index]);
570 return 1;
572 return 0;
576 * bcm_rx_thr_flush - Check for throttled data and send it to the userspace
578 * update == 0 : just check if throttled data is available (any irq context)
579 * update == 1 : check and send throttled data to userspace (soft_irq context)
581 static int bcm_rx_thr_flush(struct bcm_op *op, int update)
583 int updated = 0;
585 if (op->nframes > 1) {
586 unsigned int i;
588 /* for MUX filter we start at index 1 */
589 for (i = 1; i < op->nframes; i++)
590 updated += bcm_rx_do_flush(op, update, i);
592 } else {
593 /* for RX_FILTER_ID and simple filter */
594 updated += bcm_rx_do_flush(op, update, 0);
597 return updated;
600 static void bcm_rx_thr_tsklet(unsigned long data)
602 struct bcm_op *op = (struct bcm_op *)data;
604 /* push the changed data to the userspace */
605 bcm_rx_thr_flush(op, 1);
609 * bcm_rx_thr_handler - the time for blocked content updates is over now:
610 * Check for throttled data and send it to the userspace
612 static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer)
614 struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer);
616 tasklet_schedule(&op->thrtsklet);
618 if (bcm_rx_thr_flush(op, 0)) {
619 hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2);
620 return HRTIMER_RESTART;
621 } else {
622 /* rearm throttle handling */
623 op->kt_lastmsg = ktime_set(0, 0);
624 return HRTIMER_NORESTART;
629 * bcm_rx_handler - handle a CAN frame receiption
631 static void bcm_rx_handler(struct sk_buff *skb, void *data)
633 struct bcm_op *op = (struct bcm_op *)data;
634 const struct can_frame *rxframe = (struct can_frame *)skb->data;
635 unsigned int i;
637 /* disable timeout */
638 hrtimer_cancel(&op->timer);
640 if (op->can_id != rxframe->can_id)
641 return;
643 /* save rx timestamp */
644 op->rx_stamp = skb->tstamp;
645 /* save originator for recvfrom() */
646 op->rx_ifindex = skb->dev->ifindex;
647 /* update statistics */
648 op->frames_abs++;
650 if (op->flags & RX_RTR_FRAME) {
651 /* send reply for RTR-request (placed in op->frames[0]) */
652 bcm_can_tx(op);
653 return;
656 if (op->flags & RX_FILTER_ID) {
657 /* the easiest case */
658 bcm_rx_update_and_send(op, &op->last_frames[0], rxframe);
659 goto rx_starttimer;
662 if (op->nframes == 1) {
663 /* simple compare with index 0 */
664 bcm_rx_cmp_to_index(op, 0, rxframe);
665 goto rx_starttimer;
668 if (op->nframes > 1) {
670 * multiplex compare
672 * find the first multiplex mask that fits.
673 * Remark: The MUX-mask is stored in index 0
676 for (i = 1; i < op->nframes; i++) {
677 if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) ==
678 (GET_U64(&op->frames[0]) &
679 GET_U64(&op->frames[i]))) {
680 bcm_rx_cmp_to_index(op, i, rxframe);
681 break;
686 rx_starttimer:
687 bcm_rx_starttimer(op);
691 * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements
693 static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id,
694 int ifindex)
696 struct bcm_op *op;
698 list_for_each_entry(op, ops, list) {
699 if ((op->can_id == can_id) && (op->ifindex == ifindex))
700 return op;
703 return NULL;
706 static void bcm_remove_op(struct bcm_op *op)
708 hrtimer_cancel(&op->timer);
709 hrtimer_cancel(&op->thrtimer);
711 if (op->tsklet.func)
712 tasklet_kill(&op->tsklet);
714 if (op->thrtsklet.func)
715 tasklet_kill(&op->thrtsklet);
717 if ((op->frames) && (op->frames != &op->sframe))
718 kfree(op->frames);
720 if ((op->last_frames) && (op->last_frames != &op->last_sframe))
721 kfree(op->last_frames);
723 kfree(op);
726 static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
728 if (op->rx_reg_dev == dev) {
729 can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
730 bcm_rx_handler, op);
732 /* mark as removed subscription */
733 op->rx_reg_dev = NULL;
734 } else
735 printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device "
736 "mismatch %p %p\n", op->rx_reg_dev, dev);
740 * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops)
742 static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex)
744 struct bcm_op *op, *n;
746 list_for_each_entry_safe(op, n, ops, list) {
747 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
750 * Don't care if we're bound or not (due to netdev
751 * problems) can_rx_unregister() is always a save
752 * thing to do here.
754 if (op->ifindex) {
756 * Only remove subscriptions that had not
757 * been removed due to NETDEV_UNREGISTER
758 * in bcm_notifier()
760 if (op->rx_reg_dev) {
761 struct net_device *dev;
763 dev = dev_get_by_index(&init_net,
764 op->ifindex);
765 if (dev) {
766 bcm_rx_unreg(dev, op);
767 dev_put(dev);
770 } else
771 can_rx_unregister(NULL, op->can_id,
772 REGMASK(op->can_id),
773 bcm_rx_handler, op);
775 list_del(&op->list);
776 bcm_remove_op(op);
777 return 1; /* done */
781 return 0; /* not found */
785 * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops)
787 static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex)
789 struct bcm_op *op, *n;
791 list_for_each_entry_safe(op, n, ops, list) {
792 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
793 list_del(&op->list);
794 bcm_remove_op(op);
795 return 1; /* done */
799 return 0; /* not found */
803 * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg)
805 static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
806 int ifindex)
808 struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex);
810 if (!op)
811 return -EINVAL;
813 /* put current values into msg_head */
814 msg_head->flags = op->flags;
815 msg_head->count = op->count;
816 msg_head->ival1 = op->ival1;
817 msg_head->ival2 = op->ival2;
818 msg_head->nframes = op->nframes;
820 bcm_send_to_user(op, msg_head, op->frames, 0);
822 return MHSIZ;
826 * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg)
828 static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
829 int ifindex, struct sock *sk)
831 struct bcm_sock *bo = bcm_sk(sk);
832 struct bcm_op *op;
833 unsigned int i;
834 int err;
836 /* we need a real device to send frames */
837 if (!ifindex)
838 return -ENODEV;
840 /* check nframes boundaries - we need at least one can_frame */
841 if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
842 return -EINVAL;
844 /* check the given can_id */
845 op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex);
847 if (op) {
848 /* update existing BCM operation */
851 * Do we need more space for the can_frames than currently
852 * allocated? -> This is a _really_ unusual use-case and
853 * therefore (complexity / locking) it is not supported.
855 if (msg_head->nframes > op->nframes)
856 return -E2BIG;
858 /* update can_frames content */
859 for (i = 0; i < msg_head->nframes; i++) {
860 err = memcpy_fromiovec((u8 *)&op->frames[i],
861 msg->msg_iov, CFSIZ);
863 if (op->frames[i].can_dlc > 8)
864 err = -EINVAL;
866 if (err < 0)
867 return err;
869 if (msg_head->flags & TX_CP_CAN_ID) {
870 /* copy can_id into frame */
871 op->frames[i].can_id = msg_head->can_id;
875 } else {
876 /* insert new BCM operation for the given can_id */
878 op = kzalloc(OPSIZ, GFP_KERNEL);
879 if (!op)
880 return -ENOMEM;
882 op->can_id = msg_head->can_id;
884 /* create array for can_frames and copy the data */
885 if (msg_head->nframes > 1) {
886 op->frames = kmalloc(msg_head->nframes * CFSIZ,
887 GFP_KERNEL);
888 if (!op->frames) {
889 kfree(op);
890 return -ENOMEM;
892 } else
893 op->frames = &op->sframe;
895 for (i = 0; i < msg_head->nframes; i++) {
896 err = memcpy_fromiovec((u8 *)&op->frames[i],
897 msg->msg_iov, CFSIZ);
899 if (op->frames[i].can_dlc > 8)
900 err = -EINVAL;
902 if (err < 0) {
903 if (op->frames != &op->sframe)
904 kfree(op->frames);
905 kfree(op);
906 return err;
909 if (msg_head->flags & TX_CP_CAN_ID) {
910 /* copy can_id into frame */
911 op->frames[i].can_id = msg_head->can_id;
915 /* tx_ops never compare with previous received messages */
916 op->last_frames = NULL;
918 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
919 op->sk = sk;
920 op->ifindex = ifindex;
922 /* initialize uninitialized (kzalloc) structure */
923 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
924 op->timer.function = bcm_tx_timeout_handler;
926 /* initialize tasklet for tx countevent notification */
927 tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
928 (unsigned long) op);
930 /* currently unused in tx_ops */
931 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
933 /* add this bcm_op to the list of the tx_ops */
934 list_add(&op->list, &bo->tx_ops);
936 } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */
938 if (op->nframes != msg_head->nframes) {
939 op->nframes = msg_head->nframes;
940 /* start multiple frame transmission with index 0 */
941 op->currframe = 0;
944 /* check flags */
946 op->flags = msg_head->flags;
948 if (op->flags & TX_RESET_MULTI_IDX) {
949 /* start multiple frame transmission with index 0 */
950 op->currframe = 0;
953 if (op->flags & SETTIMER) {
954 /* set timer values */
955 op->count = msg_head->count;
956 op->ival1 = msg_head->ival1;
957 op->ival2 = msg_head->ival2;
958 op->kt_ival1 = timeval_to_ktime(msg_head->ival1);
959 op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
961 /* disable an active timer due to zero values? */
962 if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64)
963 hrtimer_cancel(&op->timer);
966 if ((op->flags & STARTTIMER) &&
967 ((op->kt_ival1.tv64 && op->count) || op->kt_ival2.tv64)) {
969 /* spec: send can_frame when starting timer */
970 op->flags |= TX_ANNOUNCE;
972 if (op->kt_ival1.tv64 && (op->count > 0)) {
973 /* op->count-- is done in bcm_tx_timeout_handler */
974 hrtimer_start(&op->timer, op->kt_ival1,
975 HRTIMER_MODE_REL);
976 } else
977 hrtimer_start(&op->timer, op->kt_ival2,
978 HRTIMER_MODE_REL);
981 if (op->flags & TX_ANNOUNCE)
982 bcm_can_tx(op);
984 return msg_head->nframes * CFSIZ + MHSIZ;
988 * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg)
990 static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
991 int ifindex, struct sock *sk)
993 struct bcm_sock *bo = bcm_sk(sk);
994 struct bcm_op *op;
995 int do_rx_register;
996 int err = 0;
998 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
999 /* be robust against wrong usage ... */
1000 msg_head->flags |= RX_FILTER_ID;
1001 /* ignore trailing garbage */
1002 msg_head->nframes = 0;
1005 /* the first element contains the mux-mask => MAX_NFRAMES + 1 */
1006 if (msg_head->nframes > MAX_NFRAMES + 1)
1007 return -EINVAL;
1009 if ((msg_head->flags & RX_RTR_FRAME) &&
1010 ((msg_head->nframes != 1) ||
1011 (!(msg_head->can_id & CAN_RTR_FLAG))))
1012 return -EINVAL;
1014 /* check the given can_id */
1015 op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex);
1016 if (op) {
1017 /* update existing BCM operation */
1020 * Do we need more space for the can_frames than currently
1021 * allocated? -> This is a _really_ unusual use-case and
1022 * therefore (complexity / locking) it is not supported.
1024 if (msg_head->nframes > op->nframes)
1025 return -E2BIG;
1027 if (msg_head->nframes) {
1028 /* update can_frames content */
1029 err = memcpy_fromiovec((u8 *)op->frames,
1030 msg->msg_iov,
1031 msg_head->nframes * CFSIZ);
1032 if (err < 0)
1033 return err;
1035 /* clear last_frames to indicate 'nothing received' */
1036 memset(op->last_frames, 0, msg_head->nframes * CFSIZ);
1039 op->nframes = msg_head->nframes;
1041 /* Only an update -> do not call can_rx_register() */
1042 do_rx_register = 0;
1044 } else {
1045 /* insert new BCM operation for the given can_id */
1046 op = kzalloc(OPSIZ, GFP_KERNEL);
1047 if (!op)
1048 return -ENOMEM;
1050 op->can_id = msg_head->can_id;
1051 op->nframes = msg_head->nframes;
1053 if (msg_head->nframes > 1) {
1054 /* create array for can_frames and copy the data */
1055 op->frames = kmalloc(msg_head->nframes * CFSIZ,
1056 GFP_KERNEL);
1057 if (!op->frames) {
1058 kfree(op);
1059 return -ENOMEM;
1062 /* create and init array for received can_frames */
1063 op->last_frames = kzalloc(msg_head->nframes * CFSIZ,
1064 GFP_KERNEL);
1065 if (!op->last_frames) {
1066 kfree(op->frames);
1067 kfree(op);
1068 return -ENOMEM;
1071 } else {
1072 op->frames = &op->sframe;
1073 op->last_frames = &op->last_sframe;
1076 if (msg_head->nframes) {
1077 err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov,
1078 msg_head->nframes * CFSIZ);
1079 if (err < 0) {
1080 if (op->frames != &op->sframe)
1081 kfree(op->frames);
1082 if (op->last_frames != &op->last_sframe)
1083 kfree(op->last_frames);
1084 kfree(op);
1085 return err;
1089 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
1090 op->sk = sk;
1091 op->ifindex = ifindex;
1093 /* initialize uninitialized (kzalloc) structure */
1094 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1095 op->timer.function = bcm_rx_timeout_handler;
1097 /* initialize tasklet for rx timeout notification */
1098 tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
1099 (unsigned long) op);
1101 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1102 op->thrtimer.function = bcm_rx_thr_handler;
1104 /* initialize tasklet for rx throttle handling */
1105 tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
1106 (unsigned long) op);
1108 /* add this bcm_op to the list of the rx_ops */
1109 list_add(&op->list, &bo->rx_ops);
1111 /* call can_rx_register() */
1112 do_rx_register = 1;
1114 } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */
1116 /* check flags */
1117 op->flags = msg_head->flags;
1119 if (op->flags & RX_RTR_FRAME) {
1121 /* no timers in RTR-mode */
1122 hrtimer_cancel(&op->thrtimer);
1123 hrtimer_cancel(&op->timer);
1126 * funny feature in RX(!)_SETUP only for RTR-mode:
1127 * copy can_id into frame BUT without RTR-flag to
1128 * prevent a full-load-loopback-test ... ;-]
1130 if ((op->flags & TX_CP_CAN_ID) ||
1131 (op->frames[0].can_id == op->can_id))
1132 op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG;
1134 } else {
1135 if (op->flags & SETTIMER) {
1137 /* set timer value */
1138 op->ival1 = msg_head->ival1;
1139 op->ival2 = msg_head->ival2;
1140 op->kt_ival1 = timeval_to_ktime(msg_head->ival1);
1141 op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
1143 /* disable an active timer due to zero value? */
1144 if (!op->kt_ival1.tv64)
1145 hrtimer_cancel(&op->timer);
1148 * In any case cancel the throttle timer, flush
1149 * potentially blocked msgs and reset throttle handling
1151 op->kt_lastmsg = ktime_set(0, 0);
1152 hrtimer_cancel(&op->thrtimer);
1153 bcm_rx_thr_flush(op, 1);
1156 if ((op->flags & STARTTIMER) && op->kt_ival1.tv64)
1157 hrtimer_start(&op->timer, op->kt_ival1,
1158 HRTIMER_MODE_REL);
1161 /* now we can register for can_ids, if we added a new bcm_op */
1162 if (do_rx_register) {
1163 if (ifindex) {
1164 struct net_device *dev;
1166 dev = dev_get_by_index(&init_net, ifindex);
1167 if (dev) {
1168 err = can_rx_register(dev, op->can_id,
1169 REGMASK(op->can_id),
1170 bcm_rx_handler, op,
1171 "bcm");
1173 op->rx_reg_dev = dev;
1174 dev_put(dev);
1177 } else
1178 err = can_rx_register(NULL, op->can_id,
1179 REGMASK(op->can_id),
1180 bcm_rx_handler, op, "bcm");
1181 if (err) {
1182 /* this bcm rx op is broken -> remove it */
1183 list_del(&op->list);
1184 bcm_remove_op(op);
1185 return err;
1189 return msg_head->nframes * CFSIZ + MHSIZ;
1193 * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg)
1195 static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
1197 struct sk_buff *skb;
1198 struct net_device *dev;
1199 int err;
1201 /* we need a real device to send frames */
1202 if (!ifindex)
1203 return -ENODEV;
1205 skb = alloc_skb(CFSIZ, GFP_KERNEL);
1207 if (!skb)
1208 return -ENOMEM;
1210 err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
1211 if (err < 0) {
1212 kfree_skb(skb);
1213 return err;
1216 dev = dev_get_by_index(&init_net, ifindex);
1217 if (!dev) {
1218 kfree_skb(skb);
1219 return -ENODEV;
1222 skb->dev = dev;
1223 skb->sk = sk;
1224 err = can_send(skb, 1); /* send with loopback */
1225 dev_put(dev);
1227 if (err)
1228 return err;
1230 return CFSIZ + MHSIZ;
1234 * bcm_sendmsg - process BCM commands (opcodes) from the userspace
1236 static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock,
1237 struct msghdr *msg, size_t size)
1239 struct sock *sk = sock->sk;
1240 struct bcm_sock *bo = bcm_sk(sk);
1241 int ifindex = bo->ifindex; /* default ifindex for this bcm_op */
1242 struct bcm_msg_head msg_head;
1243 int ret; /* read bytes or error codes as return value */
1245 if (!bo->bound)
1246 return -ENOTCONN;
1248 /* check for valid message length from userspace */
1249 if (size < MHSIZ || (size - MHSIZ) % CFSIZ)
1250 return -EINVAL;
1252 /* check for alternative ifindex for this bcm_op */
1254 if (!ifindex && msg->msg_name) {
1255 /* no bound device as default => check msg_name */
1256 struct sockaddr_can *addr =
1257 (struct sockaddr_can *)msg->msg_name;
1259 if (msg->msg_namelen < sizeof(*addr))
1260 return -EINVAL;
1262 if (addr->can_family != AF_CAN)
1263 return -EINVAL;
1265 /* ifindex from sendto() */
1266 ifindex = addr->can_ifindex;
1268 if (ifindex) {
1269 struct net_device *dev;
1271 dev = dev_get_by_index(&init_net, ifindex);
1272 if (!dev)
1273 return -ENODEV;
1275 if (dev->type != ARPHRD_CAN) {
1276 dev_put(dev);
1277 return -ENODEV;
1280 dev_put(dev);
1284 /* read message head information */
1286 ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ);
1287 if (ret < 0)
1288 return ret;
1290 lock_sock(sk);
1292 switch (msg_head.opcode) {
1294 case TX_SETUP:
1295 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1296 break;
1298 case RX_SETUP:
1299 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1300 break;
1302 case TX_DELETE:
1303 if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex))
1304 ret = MHSIZ;
1305 else
1306 ret = -EINVAL;
1307 break;
1309 case RX_DELETE:
1310 if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex))
1311 ret = MHSIZ;
1312 else
1313 ret = -EINVAL;
1314 break;
1316 case TX_READ:
1317 /* reuse msg_head for the reply to TX_READ */
1318 msg_head.opcode = TX_STATUS;
1319 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1320 break;
1322 case RX_READ:
1323 /* reuse msg_head for the reply to RX_READ */
1324 msg_head.opcode = RX_STATUS;
1325 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1326 break;
1328 case TX_SEND:
1329 /* we need exactly one can_frame behind the msg head */
1330 if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ))
1331 ret = -EINVAL;
1332 else
1333 ret = bcm_tx_send(msg, ifindex, sk);
1334 break;
1336 default:
1337 ret = -EINVAL;
1338 break;
1341 release_sock(sk);
1343 return ret;
1347 * notification handler for netdevice status changes
1349 static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
1350 void *data)
1352 struct net_device *dev = (struct net_device *)data;
1353 struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
1354 struct sock *sk = &bo->sk;
1355 struct bcm_op *op;
1356 int notify_enodev = 0;
1358 if (!net_eq(dev_net(dev), &init_net))
1359 return NOTIFY_DONE;
1361 if (dev->type != ARPHRD_CAN)
1362 return NOTIFY_DONE;
1364 switch (msg) {
1366 case NETDEV_UNREGISTER:
1367 lock_sock(sk);
1369 /* remove device specific receive entries */
1370 list_for_each_entry(op, &bo->rx_ops, list)
1371 if (op->rx_reg_dev == dev)
1372 bcm_rx_unreg(dev, op);
1374 /* remove device reference, if this is our bound device */
1375 if (bo->bound && bo->ifindex == dev->ifindex) {
1376 bo->bound = 0;
1377 bo->ifindex = 0;
1378 notify_enodev = 1;
1381 release_sock(sk);
1383 if (notify_enodev) {
1384 sk->sk_err = ENODEV;
1385 if (!sock_flag(sk, SOCK_DEAD))
1386 sk->sk_error_report(sk);
1388 break;
1390 case NETDEV_DOWN:
1391 if (bo->bound && bo->ifindex == dev->ifindex) {
1392 sk->sk_err = ENETDOWN;
1393 if (!sock_flag(sk, SOCK_DEAD))
1394 sk->sk_error_report(sk);
1398 return NOTIFY_DONE;
1402 * initial settings for all BCM sockets to be set at socket creation time
1404 static int bcm_init(struct sock *sk)
1406 struct bcm_sock *bo = bcm_sk(sk);
1408 bo->bound = 0;
1409 bo->ifindex = 0;
1410 bo->dropped_usr_msgs = 0;
1411 bo->bcm_proc_read = NULL;
1413 INIT_LIST_HEAD(&bo->tx_ops);
1414 INIT_LIST_HEAD(&bo->rx_ops);
1416 /* set notifier */
1417 bo->notifier.notifier_call = bcm_notifier;
1419 register_netdevice_notifier(&bo->notifier);
1421 return 0;
1425 * standard socket functions
1427 static int bcm_release(struct socket *sock)
1429 struct sock *sk = sock->sk;
1430 struct bcm_sock *bo;
1431 struct bcm_op *op, *next;
1433 if (sk == NULL)
1434 return 0;
1436 bo = bcm_sk(sk);
1438 /* remove bcm_ops, timer, rx_unregister(), etc. */
1440 unregister_netdevice_notifier(&bo->notifier);
1442 lock_sock(sk);
1444 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1445 bcm_remove_op(op);
1447 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1449 * Don't care if we're bound or not (due to netdev problems)
1450 * can_rx_unregister() is always a save thing to do here.
1452 if (op->ifindex) {
1454 * Only remove subscriptions that had not
1455 * been removed due to NETDEV_UNREGISTER
1456 * in bcm_notifier()
1458 if (op->rx_reg_dev) {
1459 struct net_device *dev;
1461 dev = dev_get_by_index(&init_net, op->ifindex);
1462 if (dev) {
1463 bcm_rx_unreg(dev, op);
1464 dev_put(dev);
1467 } else
1468 can_rx_unregister(NULL, op->can_id,
1469 REGMASK(op->can_id),
1470 bcm_rx_handler, op);
1472 bcm_remove_op(op);
1475 /* remove procfs entry */
1476 if (proc_dir && bo->bcm_proc_read)
1477 remove_proc_entry(bo->procname, proc_dir);
1479 /* remove device reference */
1480 if (bo->bound) {
1481 bo->bound = 0;
1482 bo->ifindex = 0;
1485 sock_orphan(sk);
1486 sock->sk = NULL;
1488 release_sock(sk);
1489 sock_put(sk);
1491 return 0;
1494 static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1495 int flags)
1497 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1498 struct sock *sk = sock->sk;
1499 struct bcm_sock *bo = bcm_sk(sk);
1501 if (len < sizeof(*addr))
1502 return -EINVAL;
1504 if (bo->bound)
1505 return -EISCONN;
1507 /* bind a device to this socket */
1508 if (addr->can_ifindex) {
1509 struct net_device *dev;
1511 dev = dev_get_by_index(&init_net, addr->can_ifindex);
1512 if (!dev)
1513 return -ENODEV;
1515 if (dev->type != ARPHRD_CAN) {
1516 dev_put(dev);
1517 return -ENODEV;
1520 bo->ifindex = dev->ifindex;
1521 dev_put(dev);
1523 } else {
1524 /* no interface reference for ifindex = 0 ('any' CAN device) */
1525 bo->ifindex = 0;
1528 bo->bound = 1;
1530 if (proc_dir) {
1531 /* unique socket address as filename */
1532 sprintf(bo->procname, "%lu", sock_i_ino(sk));
1533 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1534 proc_dir,
1535 &bcm_proc_fops, sk);
1538 return 0;
1541 static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock,
1542 struct msghdr *msg, size_t size, int flags)
1544 struct sock *sk = sock->sk;
1545 struct sk_buff *skb;
1546 int error = 0;
1547 int noblock;
1548 int err;
1550 noblock = flags & MSG_DONTWAIT;
1551 flags &= ~MSG_DONTWAIT;
1552 skb = skb_recv_datagram(sk, flags, noblock, &error);
1553 if (!skb)
1554 return error;
1556 if (skb->len < size)
1557 size = skb->len;
1559 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
1560 if (err < 0) {
1561 skb_free_datagram(sk, skb);
1562 return err;
1565 sock_recv_ts_and_drops(msg, sk, skb);
1567 if (msg->msg_name) {
1568 msg->msg_namelen = sizeof(struct sockaddr_can);
1569 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1572 skb_free_datagram(sk, skb);
1574 return size;
1577 static const struct proto_ops bcm_ops = {
1578 .family = PF_CAN,
1579 .release = bcm_release,
1580 .bind = sock_no_bind,
1581 .connect = bcm_connect,
1582 .socketpair = sock_no_socketpair,
1583 .accept = sock_no_accept,
1584 .getname = sock_no_getname,
1585 .poll = datagram_poll,
1586 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
1587 .listen = sock_no_listen,
1588 .shutdown = sock_no_shutdown,
1589 .setsockopt = sock_no_setsockopt,
1590 .getsockopt = sock_no_getsockopt,
1591 .sendmsg = bcm_sendmsg,
1592 .recvmsg = bcm_recvmsg,
1593 .mmap = sock_no_mmap,
1594 .sendpage = sock_no_sendpage,
1597 static struct proto bcm_proto __read_mostly = {
1598 .name = "CAN_BCM",
1599 .owner = THIS_MODULE,
1600 .obj_size = sizeof(struct bcm_sock),
1601 .init = bcm_init,
1604 static const struct can_proto bcm_can_proto = {
1605 .type = SOCK_DGRAM,
1606 .protocol = CAN_BCM,
1607 .ops = &bcm_ops,
1608 .prot = &bcm_proto,
1611 static int __init bcm_module_init(void)
1613 int err;
1615 printk(banner);
1617 err = can_proto_register(&bcm_can_proto);
1618 if (err < 0) {
1619 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1620 return err;
1623 /* create /proc/net/can-bcm directory */
1624 proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
1625 return 0;
1628 static void __exit bcm_module_exit(void)
1630 can_proto_unregister(&bcm_can_proto);
1632 if (proc_dir)
1633 proc_net_remove(&init_net, "can-bcm");
1636 module_init(bcm_module_init);
1637 module_exit(bcm_module_exit);