Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / net / can / bcm.c
blob151b7730c12c72e430d0e277af67ac4846e22f05
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.
42 #include <linux/module.h>
43 #include <linux/init.h>
44 #include <linux/interrupt.h>
45 #include <linux/hrtimer.h>
46 #include <linux/list.h>
47 #include <linux/proc_fs.h>
48 #include <linux/seq_file.h>
49 #include <linux/uio.h>
50 #include <linux/net.h>
51 #include <linux/netdevice.h>
52 #include <linux/socket.h>
53 #include <linux/if_arp.h>
54 #include <linux/skbuff.h>
55 #include <linux/can.h>
56 #include <linux/can/core.h>
57 #include <linux/can/bcm.h>
58 #include <linux/slab.h>
59 #include <net/sock.h>
60 #include <net/net_namespace.h>
63 * To send multiple CAN frame content within TX_SETUP or to filter
64 * CAN messages with multiplex index within RX_SETUP, the number of
65 * different filters is limited to 256 due to the one byte index value.
67 #define MAX_NFRAMES 256
69 /* use of last_frames[index].can_dlc */
70 #define RX_RECV 0x40 /* received data for this element */
71 #define RX_THR 0x80 /* element not been sent due to throttle feature */
72 #define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */
74 /* get best masking value for can_rx_register() for a given single can_id */
75 #define REGMASK(id) ((id & CAN_EFF_FLAG) ? \
76 (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \
77 (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG))
79 #define CAN_BCM_VERSION CAN_VERSION
80 static __initdata const char banner[] = KERN_INFO
81 "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n";
83 MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
84 MODULE_LICENSE("Dual BSD/GPL");
85 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
86 MODULE_ALIAS("can-proto-2");
88 /* easy access to can_frame payload */
89 static inline u64 GET_U64(const struct can_frame *cp)
91 return *(u64 *)cp->data;
94 struct bcm_op {
95 struct list_head list;
96 int ifindex;
97 canid_t can_id;
98 u32 flags;
99 unsigned long frames_abs, frames_filtered;
100 struct timeval ival1, ival2;
101 struct hrtimer timer, thrtimer;
102 struct tasklet_struct tsklet, thrtsklet;
103 ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg;
104 int rx_ifindex;
105 u32 count;
106 u32 nframes;
107 u32 currframe;
108 struct can_frame *frames;
109 struct can_frame *last_frames;
110 struct can_frame sframe;
111 struct can_frame last_sframe;
112 struct sock *sk;
113 struct net_device *rx_reg_dev;
116 static struct proc_dir_entry *proc_dir;
118 struct bcm_sock {
119 struct sock sk;
120 int bound;
121 int ifindex;
122 struct notifier_block notifier;
123 struct list_head rx_ops;
124 struct list_head tx_ops;
125 unsigned long dropped_usr_msgs;
126 struct proc_dir_entry *bcm_proc_read;
127 char procname [32]; /* inode number in decimal with \0 */
130 static inline struct bcm_sock *bcm_sk(const struct sock *sk)
132 return (struct bcm_sock *)sk;
135 #define CFSIZ sizeof(struct can_frame)
136 #define OPSIZ sizeof(struct bcm_op)
137 #define MHSIZ sizeof(struct bcm_msg_head)
140 * procfs functions
142 static char *bcm_proc_getifname(char *result, int ifindex)
144 struct net_device *dev;
146 if (!ifindex)
147 return "any";
149 rcu_read_lock();
150 dev = dev_get_by_index_rcu(&init_net, ifindex);
151 if (dev)
152 strcpy(result, dev->name);
153 else
154 strcpy(result, "???");
155 rcu_read_unlock();
157 return result;
160 static int bcm_proc_show(struct seq_file *m, void *v)
162 char ifname[IFNAMSIZ];
163 struct sock *sk = (struct sock *)m->private;
164 struct bcm_sock *bo = bcm_sk(sk);
165 struct bcm_op *op;
167 seq_printf(m, ">>> socket %pK", sk->sk_socket);
168 seq_printf(m, " / sk %pK", sk);
169 seq_printf(m, " / bo %pK", bo);
170 seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs);
171 seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex));
172 seq_printf(m, " <<<\n");
174 list_for_each_entry(op, &bo->rx_ops, list) {
176 unsigned long reduction;
178 /* print only active entries & prevent division by zero */
179 if (!op->frames_abs)
180 continue;
182 seq_printf(m, "rx_op: %03X %-5s ",
183 op->can_id, bcm_proc_getifname(ifname, op->ifindex));
184 seq_printf(m, "[%u]%c ", op->nframes,
185 (op->flags & RX_CHECK_DLC)?'d':' ');
186 if (op->kt_ival1.tv64)
187 seq_printf(m, "timeo=%lld ",
188 (long long)
189 ktime_to_us(op->kt_ival1));
191 if (op->kt_ival2.tv64)
192 seq_printf(m, "thr=%lld ",
193 (long long)
194 ktime_to_us(op->kt_ival2));
196 seq_printf(m, "# recv %ld (%ld) => reduction: ",
197 op->frames_filtered, op->frames_abs);
199 reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
201 seq_printf(m, "%s%ld%%\n",
202 (reduction == 100)?"near ":"", reduction);
205 list_for_each_entry(op, &bo->tx_ops, list) {
207 seq_printf(m, "tx_op: %03X %s [%u] ",
208 op->can_id,
209 bcm_proc_getifname(ifname, op->ifindex),
210 op->nframes);
212 if (op->kt_ival1.tv64)
213 seq_printf(m, "t1=%lld ",
214 (long long) ktime_to_us(op->kt_ival1));
216 if (op->kt_ival2.tv64)
217 seq_printf(m, "t2=%lld ",
218 (long long) ktime_to_us(op->kt_ival2));
220 seq_printf(m, "# sent %ld\n", op->frames_abs);
222 seq_putc(m, '\n');
223 return 0;
226 static int bcm_proc_open(struct inode *inode, struct file *file)
228 return single_open(file, bcm_proc_show, PDE(inode)->data);
231 static const struct file_operations bcm_proc_fops = {
232 .owner = THIS_MODULE,
233 .open = bcm_proc_open,
234 .read = seq_read,
235 .llseek = seq_lseek,
236 .release = single_release,
240 * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface
241 * of the given bcm tx op
243 static void bcm_can_tx(struct bcm_op *op)
245 struct sk_buff *skb;
246 struct net_device *dev;
247 struct can_frame *cf = &op->frames[op->currframe];
249 /* no target device? => exit */
250 if (!op->ifindex)
251 return;
253 dev = dev_get_by_index(&init_net, op->ifindex);
254 if (!dev) {
255 /* RFC: should this bcm_op remove itself here? */
256 return;
259 skb = alloc_skb(CFSIZ, gfp_any());
260 if (!skb)
261 goto out;
263 memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
265 /* send with loopback */
266 skb->dev = dev;
267 skb->sk = op->sk;
268 can_send(skb, 1);
270 /* update statistics */
271 op->currframe++;
272 op->frames_abs++;
274 /* reached last frame? */
275 if (op->currframe >= op->nframes)
276 op->currframe = 0;
277 out:
278 dev_put(dev);
282 * bcm_send_to_user - send a BCM message to the userspace
283 * (consisting of bcm_msg_head + x CAN frames)
285 static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
286 struct can_frame *frames, int has_timestamp)
288 struct sk_buff *skb;
289 struct can_frame *firstframe;
290 struct sockaddr_can *addr;
291 struct sock *sk = op->sk;
292 unsigned int datalen = head->nframes * CFSIZ;
293 int err;
295 skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
296 if (!skb)
297 return;
299 memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
301 if (head->nframes) {
302 /* can_frames starting here */
303 firstframe = (struct can_frame *)skb_tail_pointer(skb);
305 memcpy(skb_put(skb, datalen), frames, datalen);
308 * the BCM uses the can_dlc-element of the can_frame
309 * structure for internal purposes. This is only
310 * relevant for updates that are generated by the
311 * BCM, where nframes is 1
313 if (head->nframes == 1)
314 firstframe->can_dlc &= BCM_CAN_DLC_MASK;
317 if (has_timestamp) {
318 /* restore rx timestamp */
319 skb->tstamp = op->rx_stamp;
323 * Put the datagram to the queue so that bcm_recvmsg() can
324 * get it from there. We need to pass the interface index to
325 * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
326 * containing the interface index.
329 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
330 addr = (struct sockaddr_can *)skb->cb;
331 memset(addr, 0, sizeof(*addr));
332 addr->can_family = AF_CAN;
333 addr->can_ifindex = op->rx_ifindex;
335 err = sock_queue_rcv_skb(sk, skb);
336 if (err < 0) {
337 struct bcm_sock *bo = bcm_sk(sk);
339 kfree_skb(skb);
340 /* don't care about overflows in this statistic */
341 bo->dropped_usr_msgs++;
345 static void bcm_tx_start_timer(struct bcm_op *op)
347 if (op->kt_ival1.tv64 && op->count)
348 hrtimer_start(&op->timer,
349 ktime_add(ktime_get(), op->kt_ival1),
350 HRTIMER_MODE_ABS);
351 else if (op->kt_ival2.tv64)
352 hrtimer_start(&op->timer,
353 ktime_add(ktime_get(), op->kt_ival2),
354 HRTIMER_MODE_ABS);
357 static void bcm_tx_timeout_tsklet(unsigned long data)
359 struct bcm_op *op = (struct bcm_op *)data;
360 struct bcm_msg_head msg_head;
362 if (op->kt_ival1.tv64 && (op->count > 0)) {
364 op->count--;
365 if (!op->count && (op->flags & TX_COUNTEVT)) {
367 /* create notification to user */
368 msg_head.opcode = TX_EXPIRED;
369 msg_head.flags = op->flags;
370 msg_head.count = op->count;
371 msg_head.ival1 = op->ival1;
372 msg_head.ival2 = op->ival2;
373 msg_head.can_id = op->can_id;
374 msg_head.nframes = 0;
376 bcm_send_to_user(op, &msg_head, NULL, 0);
378 bcm_can_tx(op);
380 } else if (op->kt_ival2.tv64)
381 bcm_can_tx(op);
383 bcm_tx_start_timer(op);
387 * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions
389 static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer)
391 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
393 tasklet_schedule(&op->tsklet);
395 return HRTIMER_NORESTART;
399 * bcm_rx_changed - create a RX_CHANGED notification due to changed content
401 static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data)
403 struct bcm_msg_head head;
405 /* update statistics */
406 op->frames_filtered++;
408 /* prevent statistics overflow */
409 if (op->frames_filtered > ULONG_MAX/100)
410 op->frames_filtered = op->frames_abs = 0;
412 /* this element is not throttled anymore */
413 data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV);
415 head.opcode = RX_CHANGED;
416 head.flags = op->flags;
417 head.count = op->count;
418 head.ival1 = op->ival1;
419 head.ival2 = op->ival2;
420 head.can_id = op->can_id;
421 head.nframes = 1;
423 bcm_send_to_user(op, &head, data, 1);
427 * bcm_rx_update_and_send - process a detected relevant receive content change
428 * 1. update the last received data
429 * 2. send a notification to the user (if possible)
431 static void bcm_rx_update_and_send(struct bcm_op *op,
432 struct can_frame *lastdata,
433 const struct can_frame *rxdata)
435 memcpy(lastdata, rxdata, CFSIZ);
437 /* mark as used and throttled by default */
438 lastdata->can_dlc |= (RX_RECV|RX_THR);
440 /* throtteling mode inactive ? */
441 if (!op->kt_ival2.tv64) {
442 /* send RX_CHANGED to the user immediately */
443 bcm_rx_changed(op, lastdata);
444 return;
447 /* with active throttling timer we are just done here */
448 if (hrtimer_active(&op->thrtimer))
449 return;
451 /* first receiption with enabled throttling mode */
452 if (!op->kt_lastmsg.tv64)
453 goto rx_changed_settime;
455 /* got a second frame inside a potential throttle period? */
456 if (ktime_us_delta(ktime_get(), op->kt_lastmsg) <
457 ktime_to_us(op->kt_ival2)) {
458 /* do not send the saved data - only start throttle timer */
459 hrtimer_start(&op->thrtimer,
460 ktime_add(op->kt_lastmsg, op->kt_ival2),
461 HRTIMER_MODE_ABS);
462 return;
465 /* the gap was that big, that throttling was not needed here */
466 rx_changed_settime:
467 bcm_rx_changed(op, lastdata);
468 op->kt_lastmsg = ktime_get();
472 * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly
473 * received data stored in op->last_frames[]
475 static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index,
476 const struct can_frame *rxdata)
479 * no one uses the MSBs of can_dlc for comparation,
480 * so we use it here to detect the first time of reception
483 if (!(op->last_frames[index].can_dlc & RX_RECV)) {
484 /* received data for the first time => send update to user */
485 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
486 return;
489 /* do a real check in can_frame data section */
491 if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) !=
492 (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) {
493 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
494 return;
497 if (op->flags & RX_CHECK_DLC) {
498 /* do a real check in can_frame dlc */
499 if (rxdata->can_dlc != (op->last_frames[index].can_dlc &
500 BCM_CAN_DLC_MASK)) {
501 bcm_rx_update_and_send(op, &op->last_frames[index],
502 rxdata);
503 return;
509 * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption
511 static void bcm_rx_starttimer(struct bcm_op *op)
513 if (op->flags & RX_NO_AUTOTIMER)
514 return;
516 if (op->kt_ival1.tv64)
517 hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL);
520 static void bcm_rx_timeout_tsklet(unsigned long data)
522 struct bcm_op *op = (struct bcm_op *)data;
523 struct bcm_msg_head msg_head;
525 /* create notification to user */
526 msg_head.opcode = RX_TIMEOUT;
527 msg_head.flags = op->flags;
528 msg_head.count = op->count;
529 msg_head.ival1 = op->ival1;
530 msg_head.ival2 = op->ival2;
531 msg_head.can_id = op->can_id;
532 msg_head.nframes = 0;
534 bcm_send_to_user(op, &msg_head, NULL, 0);
538 * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out
540 static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer)
542 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
544 /* schedule before NET_RX_SOFTIRQ */
545 tasklet_hi_schedule(&op->tsklet);
547 /* no restart of the timer is done here! */
549 /* if user wants to be informed, when cyclic CAN-Messages come back */
550 if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) {
551 /* clear received can_frames to indicate 'nothing received' */
552 memset(op->last_frames, 0, op->nframes * CFSIZ);
555 return HRTIMER_NORESTART;
559 * bcm_rx_do_flush - helper for bcm_rx_thr_flush
561 static inline int bcm_rx_do_flush(struct bcm_op *op, int update,
562 unsigned int index)
564 if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) {
565 if (update)
566 bcm_rx_changed(op, &op->last_frames[index]);
567 return 1;
569 return 0;
573 * bcm_rx_thr_flush - Check for throttled data and send it to the userspace
575 * update == 0 : just check if throttled data is available (any irq context)
576 * update == 1 : check and send throttled data to userspace (soft_irq context)
578 static int bcm_rx_thr_flush(struct bcm_op *op, int update)
580 int updated = 0;
582 if (op->nframes > 1) {
583 unsigned int i;
585 /* for MUX filter we start at index 1 */
586 for (i = 1; i < op->nframes; i++)
587 updated += bcm_rx_do_flush(op, update, i);
589 } else {
590 /* for RX_FILTER_ID and simple filter */
591 updated += bcm_rx_do_flush(op, update, 0);
594 return updated;
597 static void bcm_rx_thr_tsklet(unsigned long data)
599 struct bcm_op *op = (struct bcm_op *)data;
601 /* push the changed data to the userspace */
602 bcm_rx_thr_flush(op, 1);
606 * bcm_rx_thr_handler - the time for blocked content updates is over now:
607 * Check for throttled data and send it to the userspace
609 static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer)
611 struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer);
613 tasklet_schedule(&op->thrtsklet);
615 if (bcm_rx_thr_flush(op, 0)) {
616 hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2);
617 return HRTIMER_RESTART;
618 } else {
619 /* rearm throttle handling */
620 op->kt_lastmsg = ktime_set(0, 0);
621 return HRTIMER_NORESTART;
626 * bcm_rx_handler - handle a CAN frame receiption
628 static void bcm_rx_handler(struct sk_buff *skb, void *data)
630 struct bcm_op *op = (struct bcm_op *)data;
631 const struct can_frame *rxframe = (struct can_frame *)skb->data;
632 unsigned int i;
634 /* disable timeout */
635 hrtimer_cancel(&op->timer);
637 if (op->can_id != rxframe->can_id)
638 return;
640 /* save rx timestamp */
641 op->rx_stamp = skb->tstamp;
642 /* save originator for recvfrom() */
643 op->rx_ifindex = skb->dev->ifindex;
644 /* update statistics */
645 op->frames_abs++;
647 if (op->flags & RX_RTR_FRAME) {
648 /* send reply for RTR-request (placed in op->frames[0]) */
649 bcm_can_tx(op);
650 return;
653 if (op->flags & RX_FILTER_ID) {
654 /* the easiest case */
655 bcm_rx_update_and_send(op, &op->last_frames[0], rxframe);
656 goto rx_starttimer;
659 if (op->nframes == 1) {
660 /* simple compare with index 0 */
661 bcm_rx_cmp_to_index(op, 0, rxframe);
662 goto rx_starttimer;
665 if (op->nframes > 1) {
667 * multiplex compare
669 * find the first multiplex mask that fits.
670 * Remark: The MUX-mask is stored in index 0
673 for (i = 1; i < op->nframes; i++) {
674 if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) ==
675 (GET_U64(&op->frames[0]) &
676 GET_U64(&op->frames[i]))) {
677 bcm_rx_cmp_to_index(op, i, rxframe);
678 break;
683 rx_starttimer:
684 bcm_rx_starttimer(op);
688 * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements
690 static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id,
691 int ifindex)
693 struct bcm_op *op;
695 list_for_each_entry(op, ops, list) {
696 if ((op->can_id == can_id) && (op->ifindex == ifindex))
697 return op;
700 return NULL;
703 static void bcm_remove_op(struct bcm_op *op)
705 hrtimer_cancel(&op->timer);
706 hrtimer_cancel(&op->thrtimer);
708 if (op->tsklet.func)
709 tasklet_kill(&op->tsklet);
711 if (op->thrtsklet.func)
712 tasklet_kill(&op->thrtsklet);
714 if ((op->frames) && (op->frames != &op->sframe))
715 kfree(op->frames);
717 if ((op->last_frames) && (op->last_frames != &op->last_sframe))
718 kfree(op->last_frames);
720 kfree(op);
723 static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
725 if (op->rx_reg_dev == dev) {
726 can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
727 bcm_rx_handler, op);
729 /* mark as removed subscription */
730 op->rx_reg_dev = NULL;
731 } else
732 printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device "
733 "mismatch %p %p\n", op->rx_reg_dev, dev);
737 * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops)
739 static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex)
741 struct bcm_op *op, *n;
743 list_for_each_entry_safe(op, n, ops, list) {
744 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
747 * Don't care if we're bound or not (due to netdev
748 * problems) can_rx_unregister() is always a save
749 * thing to do here.
751 if (op->ifindex) {
753 * Only remove subscriptions that had not
754 * been removed due to NETDEV_UNREGISTER
755 * in bcm_notifier()
757 if (op->rx_reg_dev) {
758 struct net_device *dev;
760 dev = dev_get_by_index(&init_net,
761 op->ifindex);
762 if (dev) {
763 bcm_rx_unreg(dev, op);
764 dev_put(dev);
767 } else
768 can_rx_unregister(NULL, op->can_id,
769 REGMASK(op->can_id),
770 bcm_rx_handler, op);
772 list_del(&op->list);
773 bcm_remove_op(op);
774 return 1; /* done */
778 return 0; /* not found */
782 * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops)
784 static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex)
786 struct bcm_op *op, *n;
788 list_for_each_entry_safe(op, n, ops, list) {
789 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
790 list_del(&op->list);
791 bcm_remove_op(op);
792 return 1; /* done */
796 return 0; /* not found */
800 * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg)
802 static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
803 int ifindex)
805 struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex);
807 if (!op)
808 return -EINVAL;
810 /* put current values into msg_head */
811 msg_head->flags = op->flags;
812 msg_head->count = op->count;
813 msg_head->ival1 = op->ival1;
814 msg_head->ival2 = op->ival2;
815 msg_head->nframes = op->nframes;
817 bcm_send_to_user(op, msg_head, op->frames, 0);
819 return MHSIZ;
823 * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg)
825 static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
826 int ifindex, struct sock *sk)
828 struct bcm_sock *bo = bcm_sk(sk);
829 struct bcm_op *op;
830 unsigned int i;
831 int err;
833 /* we need a real device to send frames */
834 if (!ifindex)
835 return -ENODEV;
837 /* check nframes boundaries - we need at least one can_frame */
838 if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
839 return -EINVAL;
841 /* check the given can_id */
842 op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex);
844 if (op) {
845 /* update existing BCM operation */
848 * Do we need more space for the can_frames than currently
849 * allocated? -> This is a _really_ unusual use-case and
850 * therefore (complexity / locking) it is not supported.
852 if (msg_head->nframes > op->nframes)
853 return -E2BIG;
855 /* update can_frames content */
856 for (i = 0; i < msg_head->nframes; i++) {
857 err = memcpy_fromiovec((u8 *)&op->frames[i],
858 msg->msg_iov, CFSIZ);
860 if (op->frames[i].can_dlc > 8)
861 err = -EINVAL;
863 if (err < 0)
864 return err;
866 if (msg_head->flags & TX_CP_CAN_ID) {
867 /* copy can_id into frame */
868 op->frames[i].can_id = msg_head->can_id;
872 } else {
873 /* insert new BCM operation for the given can_id */
875 op = kzalloc(OPSIZ, GFP_KERNEL);
876 if (!op)
877 return -ENOMEM;
879 op->can_id = msg_head->can_id;
881 /* create array for can_frames and copy the data */
882 if (msg_head->nframes > 1) {
883 op->frames = kmalloc(msg_head->nframes * CFSIZ,
884 GFP_KERNEL);
885 if (!op->frames) {
886 kfree(op);
887 return -ENOMEM;
889 } else
890 op->frames = &op->sframe;
892 for (i = 0; i < msg_head->nframes; i++) {
893 err = memcpy_fromiovec((u8 *)&op->frames[i],
894 msg->msg_iov, CFSIZ);
896 if (op->frames[i].can_dlc > 8)
897 err = -EINVAL;
899 if (err < 0) {
900 if (op->frames != &op->sframe)
901 kfree(op->frames);
902 kfree(op);
903 return err;
906 if (msg_head->flags & TX_CP_CAN_ID) {
907 /* copy can_id into frame */
908 op->frames[i].can_id = msg_head->can_id;
912 /* tx_ops never compare with previous received messages */
913 op->last_frames = NULL;
915 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
916 op->sk = sk;
917 op->ifindex = ifindex;
919 /* initialize uninitialized (kzalloc) structure */
920 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
921 op->timer.function = bcm_tx_timeout_handler;
923 /* initialize tasklet for tx countevent notification */
924 tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
925 (unsigned long) op);
927 /* currently unused in tx_ops */
928 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
930 /* add this bcm_op to the list of the tx_ops */
931 list_add(&op->list, &bo->tx_ops);
933 } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */
935 if (op->nframes != msg_head->nframes) {
936 op->nframes = msg_head->nframes;
937 /* start multiple frame transmission with index 0 */
938 op->currframe = 0;
941 /* check flags */
943 op->flags = msg_head->flags;
945 if (op->flags & TX_RESET_MULTI_IDX) {
946 /* start multiple frame transmission with index 0 */
947 op->currframe = 0;
950 if (op->flags & SETTIMER) {
951 /* set timer values */
952 op->count = msg_head->count;
953 op->ival1 = msg_head->ival1;
954 op->ival2 = msg_head->ival2;
955 op->kt_ival1 = timeval_to_ktime(msg_head->ival1);
956 op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
958 /* disable an active timer due to zero values? */
959 if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64)
960 hrtimer_cancel(&op->timer);
963 if (op->flags & STARTTIMER) {
964 hrtimer_cancel(&op->timer);
965 /* spec: send can_frame when starting timer */
966 op->flags |= TX_ANNOUNCE;
969 if (op->flags & TX_ANNOUNCE) {
970 bcm_can_tx(op);
971 if (op->count)
972 op->count--;
975 if (op->flags & STARTTIMER)
976 bcm_tx_start_timer(op);
978 return msg_head->nframes * CFSIZ + MHSIZ;
982 * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg)
984 static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
985 int ifindex, struct sock *sk)
987 struct bcm_sock *bo = bcm_sk(sk);
988 struct bcm_op *op;
989 int do_rx_register;
990 int err = 0;
992 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
993 /* be robust against wrong usage ... */
994 msg_head->flags |= RX_FILTER_ID;
995 /* ignore trailing garbage */
996 msg_head->nframes = 0;
999 /* the first element contains the mux-mask => MAX_NFRAMES + 1 */
1000 if (msg_head->nframes > MAX_NFRAMES + 1)
1001 return -EINVAL;
1003 if ((msg_head->flags & RX_RTR_FRAME) &&
1004 ((msg_head->nframes != 1) ||
1005 (!(msg_head->can_id & CAN_RTR_FLAG))))
1006 return -EINVAL;
1008 /* check the given can_id */
1009 op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex);
1010 if (op) {
1011 /* update existing BCM operation */
1014 * Do we need more space for the can_frames than currently
1015 * allocated? -> This is a _really_ unusual use-case and
1016 * therefore (complexity / locking) it is not supported.
1018 if (msg_head->nframes > op->nframes)
1019 return -E2BIG;
1021 if (msg_head->nframes) {
1022 /* update can_frames content */
1023 err = memcpy_fromiovec((u8 *)op->frames,
1024 msg->msg_iov,
1025 msg_head->nframes * CFSIZ);
1026 if (err < 0)
1027 return err;
1029 /* clear last_frames to indicate 'nothing received' */
1030 memset(op->last_frames, 0, msg_head->nframes * CFSIZ);
1033 op->nframes = msg_head->nframes;
1035 /* Only an update -> do not call can_rx_register() */
1036 do_rx_register = 0;
1038 } else {
1039 /* insert new BCM operation for the given can_id */
1040 op = kzalloc(OPSIZ, GFP_KERNEL);
1041 if (!op)
1042 return -ENOMEM;
1044 op->can_id = msg_head->can_id;
1045 op->nframes = msg_head->nframes;
1047 if (msg_head->nframes > 1) {
1048 /* create array for can_frames and copy the data */
1049 op->frames = kmalloc(msg_head->nframes * CFSIZ,
1050 GFP_KERNEL);
1051 if (!op->frames) {
1052 kfree(op);
1053 return -ENOMEM;
1056 /* create and init array for received can_frames */
1057 op->last_frames = kzalloc(msg_head->nframes * CFSIZ,
1058 GFP_KERNEL);
1059 if (!op->last_frames) {
1060 kfree(op->frames);
1061 kfree(op);
1062 return -ENOMEM;
1065 } else {
1066 op->frames = &op->sframe;
1067 op->last_frames = &op->last_sframe;
1070 if (msg_head->nframes) {
1071 err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov,
1072 msg_head->nframes * CFSIZ);
1073 if (err < 0) {
1074 if (op->frames != &op->sframe)
1075 kfree(op->frames);
1076 if (op->last_frames != &op->last_sframe)
1077 kfree(op->last_frames);
1078 kfree(op);
1079 return err;
1083 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
1084 op->sk = sk;
1085 op->ifindex = ifindex;
1087 /* initialize uninitialized (kzalloc) structure */
1088 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1089 op->timer.function = bcm_rx_timeout_handler;
1091 /* initialize tasklet for rx timeout notification */
1092 tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
1093 (unsigned long) op);
1095 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1096 op->thrtimer.function = bcm_rx_thr_handler;
1098 /* initialize tasklet for rx throttle handling */
1099 tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
1100 (unsigned long) op);
1102 /* add this bcm_op to the list of the rx_ops */
1103 list_add(&op->list, &bo->rx_ops);
1105 /* call can_rx_register() */
1106 do_rx_register = 1;
1108 } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */
1110 /* check flags */
1111 op->flags = msg_head->flags;
1113 if (op->flags & RX_RTR_FRAME) {
1115 /* no timers in RTR-mode */
1116 hrtimer_cancel(&op->thrtimer);
1117 hrtimer_cancel(&op->timer);
1120 * funny feature in RX(!)_SETUP only for RTR-mode:
1121 * copy can_id into frame BUT without RTR-flag to
1122 * prevent a full-load-loopback-test ... ;-]
1124 if ((op->flags & TX_CP_CAN_ID) ||
1125 (op->frames[0].can_id == op->can_id))
1126 op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG;
1128 } else {
1129 if (op->flags & SETTIMER) {
1131 /* set timer value */
1132 op->ival1 = msg_head->ival1;
1133 op->ival2 = msg_head->ival2;
1134 op->kt_ival1 = timeval_to_ktime(msg_head->ival1);
1135 op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
1137 /* disable an active timer due to zero value? */
1138 if (!op->kt_ival1.tv64)
1139 hrtimer_cancel(&op->timer);
1142 * In any case cancel the throttle timer, flush
1143 * potentially blocked msgs and reset throttle handling
1145 op->kt_lastmsg = ktime_set(0, 0);
1146 hrtimer_cancel(&op->thrtimer);
1147 bcm_rx_thr_flush(op, 1);
1150 if ((op->flags & STARTTIMER) && op->kt_ival1.tv64)
1151 hrtimer_start(&op->timer, op->kt_ival1,
1152 HRTIMER_MODE_REL);
1155 /* now we can register for can_ids, if we added a new bcm_op */
1156 if (do_rx_register) {
1157 if (ifindex) {
1158 struct net_device *dev;
1160 dev = dev_get_by_index(&init_net, ifindex);
1161 if (dev) {
1162 err = can_rx_register(dev, op->can_id,
1163 REGMASK(op->can_id),
1164 bcm_rx_handler, op,
1165 "bcm");
1167 op->rx_reg_dev = dev;
1168 dev_put(dev);
1171 } else
1172 err = can_rx_register(NULL, op->can_id,
1173 REGMASK(op->can_id),
1174 bcm_rx_handler, op, "bcm");
1175 if (err) {
1176 /* this bcm rx op is broken -> remove it */
1177 list_del(&op->list);
1178 bcm_remove_op(op);
1179 return err;
1183 return msg_head->nframes * CFSIZ + MHSIZ;
1187 * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg)
1189 static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
1191 struct sk_buff *skb;
1192 struct net_device *dev;
1193 int err;
1195 /* we need a real device to send frames */
1196 if (!ifindex)
1197 return -ENODEV;
1199 skb = alloc_skb(CFSIZ, GFP_KERNEL);
1201 if (!skb)
1202 return -ENOMEM;
1204 err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
1205 if (err < 0) {
1206 kfree_skb(skb);
1207 return err;
1210 dev = dev_get_by_index(&init_net, ifindex);
1211 if (!dev) {
1212 kfree_skb(skb);
1213 return -ENODEV;
1216 skb->dev = dev;
1217 skb->sk = sk;
1218 err = can_send(skb, 1); /* send with loopback */
1219 dev_put(dev);
1221 if (err)
1222 return err;
1224 return CFSIZ + MHSIZ;
1228 * bcm_sendmsg - process BCM commands (opcodes) from the userspace
1230 static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock,
1231 struct msghdr *msg, size_t size)
1233 struct sock *sk = sock->sk;
1234 struct bcm_sock *bo = bcm_sk(sk);
1235 int ifindex = bo->ifindex; /* default ifindex for this bcm_op */
1236 struct bcm_msg_head msg_head;
1237 int ret; /* read bytes or error codes as return value */
1239 if (!bo->bound)
1240 return -ENOTCONN;
1242 /* check for valid message length from userspace */
1243 if (size < MHSIZ || (size - MHSIZ) % CFSIZ)
1244 return -EINVAL;
1246 /* check for alternative ifindex for this bcm_op */
1248 if (!ifindex && msg->msg_name) {
1249 /* no bound device as default => check msg_name */
1250 struct sockaddr_can *addr =
1251 (struct sockaddr_can *)msg->msg_name;
1253 if (msg->msg_namelen < sizeof(*addr))
1254 return -EINVAL;
1256 if (addr->can_family != AF_CAN)
1257 return -EINVAL;
1259 /* ifindex from sendto() */
1260 ifindex = addr->can_ifindex;
1262 if (ifindex) {
1263 struct net_device *dev;
1265 dev = dev_get_by_index(&init_net, ifindex);
1266 if (!dev)
1267 return -ENODEV;
1269 if (dev->type != ARPHRD_CAN) {
1270 dev_put(dev);
1271 return -ENODEV;
1274 dev_put(dev);
1278 /* read message head information */
1280 ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ);
1281 if (ret < 0)
1282 return ret;
1284 lock_sock(sk);
1286 switch (msg_head.opcode) {
1288 case TX_SETUP:
1289 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1290 break;
1292 case RX_SETUP:
1293 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1294 break;
1296 case TX_DELETE:
1297 if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex))
1298 ret = MHSIZ;
1299 else
1300 ret = -EINVAL;
1301 break;
1303 case RX_DELETE:
1304 if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex))
1305 ret = MHSIZ;
1306 else
1307 ret = -EINVAL;
1308 break;
1310 case TX_READ:
1311 /* reuse msg_head for the reply to TX_READ */
1312 msg_head.opcode = TX_STATUS;
1313 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1314 break;
1316 case RX_READ:
1317 /* reuse msg_head for the reply to RX_READ */
1318 msg_head.opcode = RX_STATUS;
1319 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1320 break;
1322 case TX_SEND:
1323 /* we need exactly one can_frame behind the msg head */
1324 if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ))
1325 ret = -EINVAL;
1326 else
1327 ret = bcm_tx_send(msg, ifindex, sk);
1328 break;
1330 default:
1331 ret = -EINVAL;
1332 break;
1335 release_sock(sk);
1337 return ret;
1341 * notification handler for netdevice status changes
1343 static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
1344 void *data)
1346 struct net_device *dev = (struct net_device *)data;
1347 struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
1348 struct sock *sk = &bo->sk;
1349 struct bcm_op *op;
1350 int notify_enodev = 0;
1352 if (!net_eq(dev_net(dev), &init_net))
1353 return NOTIFY_DONE;
1355 if (dev->type != ARPHRD_CAN)
1356 return NOTIFY_DONE;
1358 switch (msg) {
1360 case NETDEV_UNREGISTER:
1361 lock_sock(sk);
1363 /* remove device specific receive entries */
1364 list_for_each_entry(op, &bo->rx_ops, list)
1365 if (op->rx_reg_dev == dev)
1366 bcm_rx_unreg(dev, op);
1368 /* remove device reference, if this is our bound device */
1369 if (bo->bound && bo->ifindex == dev->ifindex) {
1370 bo->bound = 0;
1371 bo->ifindex = 0;
1372 notify_enodev = 1;
1375 release_sock(sk);
1377 if (notify_enodev) {
1378 sk->sk_err = ENODEV;
1379 if (!sock_flag(sk, SOCK_DEAD))
1380 sk->sk_error_report(sk);
1382 break;
1384 case NETDEV_DOWN:
1385 if (bo->bound && bo->ifindex == dev->ifindex) {
1386 sk->sk_err = ENETDOWN;
1387 if (!sock_flag(sk, SOCK_DEAD))
1388 sk->sk_error_report(sk);
1392 return NOTIFY_DONE;
1396 * initial settings for all BCM sockets to be set at socket creation time
1398 static int bcm_init(struct sock *sk)
1400 struct bcm_sock *bo = bcm_sk(sk);
1402 bo->bound = 0;
1403 bo->ifindex = 0;
1404 bo->dropped_usr_msgs = 0;
1405 bo->bcm_proc_read = NULL;
1407 INIT_LIST_HEAD(&bo->tx_ops);
1408 INIT_LIST_HEAD(&bo->rx_ops);
1410 /* set notifier */
1411 bo->notifier.notifier_call = bcm_notifier;
1413 register_netdevice_notifier(&bo->notifier);
1415 return 0;
1419 * standard socket functions
1421 static int bcm_release(struct socket *sock)
1423 struct sock *sk = sock->sk;
1424 struct bcm_sock *bo;
1425 struct bcm_op *op, *next;
1427 if (sk == NULL)
1428 return 0;
1430 bo = bcm_sk(sk);
1432 /* remove bcm_ops, timer, rx_unregister(), etc. */
1434 unregister_netdevice_notifier(&bo->notifier);
1436 lock_sock(sk);
1438 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1439 bcm_remove_op(op);
1441 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1443 * Don't care if we're bound or not (due to netdev problems)
1444 * can_rx_unregister() is always a save thing to do here.
1446 if (op->ifindex) {
1448 * Only remove subscriptions that had not
1449 * been removed due to NETDEV_UNREGISTER
1450 * in bcm_notifier()
1452 if (op->rx_reg_dev) {
1453 struct net_device *dev;
1455 dev = dev_get_by_index(&init_net, op->ifindex);
1456 if (dev) {
1457 bcm_rx_unreg(dev, op);
1458 dev_put(dev);
1461 } else
1462 can_rx_unregister(NULL, op->can_id,
1463 REGMASK(op->can_id),
1464 bcm_rx_handler, op);
1466 bcm_remove_op(op);
1469 /* remove procfs entry */
1470 if (proc_dir && bo->bcm_proc_read)
1471 remove_proc_entry(bo->procname, proc_dir);
1473 /* remove device reference */
1474 if (bo->bound) {
1475 bo->bound = 0;
1476 bo->ifindex = 0;
1479 sock_orphan(sk);
1480 sock->sk = NULL;
1482 release_sock(sk);
1483 sock_put(sk);
1485 return 0;
1488 static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1489 int flags)
1491 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1492 struct sock *sk = sock->sk;
1493 struct bcm_sock *bo = bcm_sk(sk);
1495 if (len < sizeof(*addr))
1496 return -EINVAL;
1498 if (bo->bound)
1499 return -EISCONN;
1501 /* bind a device to this socket */
1502 if (addr->can_ifindex) {
1503 struct net_device *dev;
1505 dev = dev_get_by_index(&init_net, addr->can_ifindex);
1506 if (!dev)
1507 return -ENODEV;
1509 if (dev->type != ARPHRD_CAN) {
1510 dev_put(dev);
1511 return -ENODEV;
1514 bo->ifindex = dev->ifindex;
1515 dev_put(dev);
1517 } else {
1518 /* no interface reference for ifindex = 0 ('any' CAN device) */
1519 bo->ifindex = 0;
1522 bo->bound = 1;
1524 if (proc_dir) {
1525 /* unique socket address as filename */
1526 sprintf(bo->procname, "%lu", sock_i_ino(sk));
1527 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1528 proc_dir,
1529 &bcm_proc_fops, sk);
1532 return 0;
1535 static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock,
1536 struct msghdr *msg, size_t size, int flags)
1538 struct sock *sk = sock->sk;
1539 struct sk_buff *skb;
1540 int error = 0;
1541 int noblock;
1542 int err;
1544 noblock = flags & MSG_DONTWAIT;
1545 flags &= ~MSG_DONTWAIT;
1546 skb = skb_recv_datagram(sk, flags, noblock, &error);
1547 if (!skb)
1548 return error;
1550 if (skb->len < size)
1551 size = skb->len;
1553 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
1554 if (err < 0) {
1555 skb_free_datagram(sk, skb);
1556 return err;
1559 sock_recv_ts_and_drops(msg, sk, skb);
1561 if (msg->msg_name) {
1562 msg->msg_namelen = sizeof(struct sockaddr_can);
1563 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1566 skb_free_datagram(sk, skb);
1568 return size;
1571 static const struct proto_ops bcm_ops = {
1572 .family = PF_CAN,
1573 .release = bcm_release,
1574 .bind = sock_no_bind,
1575 .connect = bcm_connect,
1576 .socketpair = sock_no_socketpair,
1577 .accept = sock_no_accept,
1578 .getname = sock_no_getname,
1579 .poll = datagram_poll,
1580 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
1581 .listen = sock_no_listen,
1582 .shutdown = sock_no_shutdown,
1583 .setsockopt = sock_no_setsockopt,
1584 .getsockopt = sock_no_getsockopt,
1585 .sendmsg = bcm_sendmsg,
1586 .recvmsg = bcm_recvmsg,
1587 .mmap = sock_no_mmap,
1588 .sendpage = sock_no_sendpage,
1591 static struct proto bcm_proto __read_mostly = {
1592 .name = "CAN_BCM",
1593 .owner = THIS_MODULE,
1594 .obj_size = sizeof(struct bcm_sock),
1595 .init = bcm_init,
1598 static const struct can_proto bcm_can_proto = {
1599 .type = SOCK_DGRAM,
1600 .protocol = CAN_BCM,
1601 .ops = &bcm_ops,
1602 .prot = &bcm_proto,
1605 static int __init bcm_module_init(void)
1607 int err;
1609 printk(banner);
1611 err = can_proto_register(&bcm_can_proto);
1612 if (err < 0) {
1613 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1614 return err;
1617 /* create /proc/net/can-bcm directory */
1618 proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
1619 return 0;
1622 static void __exit bcm_module_exit(void)
1624 can_proto_unregister(&bcm_can_proto);
1626 if (proc_dir)
1627 proc_net_remove(&init_net, "can-bcm");
1630 module_init(bcm_module_init);
1631 module_exit(bcm_module_exit);