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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>
62
63
64
65
66
67
68#define MAX_NFRAMES 256
69
70
71#define RX_RECV 0x40
72#define RX_THR 0x80
73#define BCM_CAN_DLC_MASK 0x0F
74
75
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))
79
80#define CAN_BCM_VERSION CAN_VERSION
81static __initdata const char banner[] = KERN_INFO
82 "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n";
83
84MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
85MODULE_LICENSE("Dual BSD/GPL");
86MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
87MODULE_ALIAS("can-proto-2");
88
89
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;
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;
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;
128 char procname [32];
129};
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
141
142
143static char *bcm_proc_getifname(char *result, int ifindex)
144{
145 struct net_device *dev;
146
147 if (!ifindex)
148 return "any";
149
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();
157
158 return result;
159}
160
161static int bcm_proc_show(struct seq_file *m, void *v)
162{
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;
167
168 seq_printf(m, ">>> socket %p", sk->sk_socket);
169 seq_printf(m, " / sk %p", sk);
170 seq_printf(m, " / bo %p", 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");
174
175 list_for_each_entry(op, &bo->rx_ops, list) {
176
177 unsigned long reduction;
178
179
180 if (!op->frames_abs)
181 continue;
182
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));
191
192 if (op->kt_ival2.tv64)
193 seq_printf(m, "thr=%lld ",
194 (long long)
195 ktime_to_us(op->kt_ival2));
196
197 seq_printf(m, "# recv %ld (%ld) => reduction: ",
198 op->frames_filtered, op->frames_abs);
199
200 reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
201
202 seq_printf(m, "%s%ld%%\n",
203 (reduction == 100)?"near ":"", reduction);
204 }
205
206 list_for_each_entry(op, &bo->tx_ops, list) {
207
208 seq_printf(m, "tx_op: %03X %s [%u] ",
209 op->can_id,
210 bcm_proc_getifname(ifname, op->ifindex),
211 op->nframes);
212
213 if (op->kt_ival1.tv64)
214 seq_printf(m, "t1=%lld ",
215 (long long) ktime_to_us(op->kt_ival1));
216
217 if (op->kt_ival2.tv64)
218 seq_printf(m, "t2=%lld ",
219 (long long) ktime_to_us(op->kt_ival2));
220
221 seq_printf(m, "# sent %ld\n", op->frames_abs);
222 }
223 seq_putc(m, '\n');
224 return 0;
225}
226
227static int bcm_proc_open(struct inode *inode, struct file *file)
228{
229 return single_open(file, bcm_proc_show, PDE(inode)->data);
230}
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
240
241
242
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
251 if (!op->ifindex)
252 return;
253
254 dev = dev_get_by_index(&init_net, op->ifindex);
255 if (!dev) {
256
257 return;
258 }
259
260 skb = alloc_skb(CFSIZ, gfp_any());
261 if (!skb)
262 goto out;
263
264 memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
265
266
267 skb->dev = dev;
268 skb->sk = op->sk;
269 can_send(skb, 1);
270
271
272 op->currframe++;
273 op->frames_abs++;
274
275
276 if (op->currframe >= op->nframes)
277 op->currframe = 0;
278 out:
279 dev_put(dev);
280}
281
282
283
284
285
286static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
287 struct can_frame *frames, int has_timestamp)
288{
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;
295
296 skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
297 if (!skb)
298 return;
299
300 memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
301
302 if (head->nframes) {
303
304 firstframe = (struct can_frame *)skb_tail_pointer(skb);
305
306 memcpy(skb_put(skb, datalen), frames, datalen);
307
308
309
310
311
312
313
314 if (head->nframes == 1)
315 firstframe->can_dlc &= BCM_CAN_DLC_MASK;
316 }
317
318 if (has_timestamp) {
319
320 skb->tstamp = op->rx_stamp;
321 }
322
323
324
325
326
327
328
329
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;
335
336 err = sock_queue_rcv_skb(sk, skb);
337 if (err < 0) {
338 struct bcm_sock *bo = bcm_sk(sk);
339
340 kfree_skb(skb);
341
342 bo->dropped_usr_msgs++;
343 }
344}
345
346static void bcm_tx_timeout_tsklet(unsigned long data)
347{
348 struct bcm_op *op = (struct bcm_op *)data;
349 struct bcm_msg_head msg_head;
350
351 if (op->kt_ival1.tv64 && (op->count > 0)) {
352
353 op->count--;
354 if (!op->count && (op->flags & TX_COUNTEVT)) {
355
356
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;
364
365 bcm_send_to_user(op, &msg_head, NULL, 0);
366 }
367 }
368
369 if (op->kt_ival1.tv64 && (op->count > 0)) {
370
371
372 bcm_can_tx(op);
373 hrtimer_start(&op->timer,
374 ktime_add(ktime_get(), op->kt_ival1),
375 HRTIMER_MODE_ABS);
376
377 } else {
378 if (op->kt_ival2.tv64) {
379
380
381 bcm_can_tx(op);
382 hrtimer_start(&op->timer,
383 ktime_add(ktime_get(), op->kt_ival2),
384 HRTIMER_MODE_ABS);
385 }
386 }
387}
388
389
390
391
392static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer)
393{
394 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
395
396 tasklet_schedule(&op->tsklet);
397
398 return HRTIMER_NORESTART;
399}
400
401
402
403
404static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data)
405{
406 struct bcm_msg_head head;
407
408
409 op->frames_filtered++;
410
411
412 if (op->frames_filtered > ULONG_MAX/100)
413 op->frames_filtered = op->frames_abs = 0;
414
415
416 data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV);
417
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;
425
426 bcm_send_to_user(op, &head, data, 1);
427}
428
429
430
431
432
433
434static void bcm_rx_update_and_send(struct bcm_op *op,
435 struct can_frame *lastdata,
436 const struct can_frame *rxdata)
437{
438 memcpy(lastdata, rxdata, CFSIZ);
439
440
441 lastdata->can_dlc |= (RX_RECV|RX_THR);
442
443
444 if (!op->kt_ival2.tv64) {
445
446 bcm_rx_changed(op, lastdata);
447 return;
448 }
449
450
451 if (hrtimer_active(&op->thrtimer))
452 return;
453
454
455 if (!op->kt_lastmsg.tv64)
456 goto rx_changed_settime;
457
458
459 if (ktime_us_delta(ktime_get(), op->kt_lastmsg) <
460 ktime_to_us(op->kt_ival2)) {
461
462 hrtimer_start(&op->thrtimer,
463 ktime_add(op->kt_lastmsg, op->kt_ival2),
464 HRTIMER_MODE_ABS);
465 return;
466 }
467
468
469rx_changed_settime:
470 bcm_rx_changed(op, lastdata);
471 op->kt_lastmsg = ktime_get();
472}
473
474
475
476
477
478static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index,
479 const struct can_frame *rxdata)
480{
481
482
483
484
485
486 if (!(op->last_frames[index].can_dlc & RX_RECV)) {
487
488 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
489 return;
490 }
491
492
493
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;
498 }
499
500 if (op->flags & RX_CHECK_DLC) {
501
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;
507 }
508 }
509}
510
511
512
513
514static void bcm_rx_starttimer(struct bcm_op *op)
515{
516 if (op->flags & RX_NO_AUTOTIMER)
517 return;
518
519 if (op->kt_ival1.tv64)
520 hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL);
521}
522
523static void bcm_rx_timeout_tsklet(unsigned long data)
524{
525 struct bcm_op *op = (struct bcm_op *)data;
526 struct bcm_msg_head msg_head;
527
528
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;
536
537 bcm_send_to_user(op, &msg_head, NULL, 0);
538}
539
540
541
542
543static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer)
544{
545 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
546
547
548 tasklet_hi_schedule(&op->tsklet);
549
550
551
552
553 if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) {
554
555 memset(op->last_frames, 0, op->nframes * CFSIZ);
556 }
557
558 return HRTIMER_NORESTART;
559}
560
561
562
563
564static inline int bcm_rx_do_flush(struct bcm_op *op, int update,
565 unsigned int index)
566{
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;
571 }
572 return 0;
573}
574
575
576
577
578
579
580
581static int bcm_rx_thr_flush(struct bcm_op *op, int update)
582{
583 int updated = 0;
584
585 if (op->nframes > 1) {
586 unsigned int i;
587
588
589 for (i = 1; i < op->nframes; i++)
590 updated += bcm_rx_do_flush(op, update, i);
591
592 } else {
593
594 updated += bcm_rx_do_flush(op, update, 0);
595 }
596
597 return updated;
598}
599
600static void bcm_rx_thr_tsklet(unsigned long data)
601{
602 struct bcm_op *op = (struct bcm_op *)data;
603
604
605 bcm_rx_thr_flush(op, 1);
606}
607
608
609
610
611
612static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer)
613{
614 struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer);
615
616 tasklet_schedule(&op->thrtsklet);
617
618 if (bcm_rx_thr_flush(op, 0)) {
619 hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2);
620 return HRTIMER_RESTART;
621 } else {
622
623 op->kt_lastmsg = ktime_set(0, 0);
624 return HRTIMER_NORESTART;
625 }
626}
627
628
629
630
631static void bcm_rx_handler(struct sk_buff *skb, void *data)
632{
633 struct bcm_op *op = (struct bcm_op *)data;
634 const struct can_frame *rxframe = (struct can_frame *)skb->data;
635 unsigned int i;
636
637
638 hrtimer_cancel(&op->timer);
639
640 if (op->can_id != rxframe->can_id)
641 return;
642
643
644 op->rx_stamp = skb->tstamp;
645
646 op->rx_ifindex = skb->dev->ifindex;
647
648 op->frames_abs++;
649
650 if (op->flags & RX_RTR_FRAME) {
651
652 bcm_can_tx(op);
653 return;
654 }
655
656 if (op->flags & RX_FILTER_ID) {
657
658 bcm_rx_update_and_send(op, &op->last_frames[0], rxframe);
659 goto rx_starttimer;
660 }
661
662 if (op->nframes == 1) {
663
664 bcm_rx_cmp_to_index(op, 0, rxframe);
665 goto rx_starttimer;
666 }
667
668 if (op->nframes > 1) {
669
670
671
672
673
674
675
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;
682 }
683 }
684 }
685
686rx_starttimer:
687 bcm_rx_starttimer(op);
688}
689
690
691
692
693static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id,
694 int ifindex)
695{
696 struct bcm_op *op;
697
698 list_for_each_entry(op, ops, list) {
699 if ((op->can_id == can_id) && (op->ifindex == ifindex))
700 return op;
701 }
702
703 return NULL;
704}
705
706static void bcm_remove_op(struct bcm_op *op)
707{
708 hrtimer_cancel(&op->timer);
709 hrtimer_cancel(&op->thrtimer);
710
711 if (op->tsklet.func)
712 tasklet_kill(&op->tsklet);
713
714 if (op->thrtsklet.func)
715 tasklet_kill(&op->thrtsklet);
716
717 if ((op->frames) && (op->frames != &op->sframe))
718 kfree(op->frames);
719
720 if ((op->last_frames) && (op->last_frames != &op->last_sframe))
721 kfree(op->last_frames);
722
723 kfree(op);
724}
725
726static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
727{
728 if (op->rx_reg_dev == dev) {
729 can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
730 bcm_rx_handler, op);
731
732
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);
737}
738
739
740
741
742static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex)
743{
744 struct bcm_op *op, *n;
745
746 list_for_each_entry_safe(op, n, ops, list) {
747 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
748
749
750
751
752
753
754 if (op->ifindex) {
755
756
757
758
759
760 if (op->rx_reg_dev) {
761 struct net_device *dev;
762
763 dev = dev_get_by_index(&init_net,
764 op->ifindex);
765 if (dev) {
766 bcm_rx_unreg(dev, op);
767 dev_put(dev);
768 }
769 }
770 } else
771 can_rx_unregister(NULL, op->can_id,
772 REGMASK(op->can_id),
773 bcm_rx_handler, op);
774
775 list_del(&op->list);
776 bcm_remove_op(op);
777 return 1;
778 }
779 }
780
781 return 0;
782}
783
784
785
786
787static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex)
788{
789 struct bcm_op *op, *n;
790
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;
796 }
797 }
798
799 return 0;
800}
801
802
803
804
805static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
806 int ifindex)
807{
808 struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex);
809
810 if (!op)
811 return -EINVAL;
812
813
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;
819
820 bcm_send_to_user(op, msg_head, op->frames, 0);
821
822 return MHSIZ;
823}
824
825
826
827
828static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
829 int ifindex, struct sock *sk)
830{
831 struct bcm_sock *bo = bcm_sk(sk);
832 struct bcm_op *op;
833 unsigned int i;
834 int err;
835
836
837 if (!ifindex)
838 return -ENODEV;
839
840
841 if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
842 return -EINVAL;
843
844
845 op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex);
846
847 if (op) {
848
849
850
851
852
853
854
855 if (msg_head->nframes > op->nframes)
856 return -E2BIG;
857
858
859 for (i = 0; i < msg_head->nframes; i++) {
860 err = memcpy_fromiovec((u8 *)&op->frames[i],
861 msg->msg_iov, CFSIZ);
862
863 if (op->frames[i].can_dlc > 8)
864 err = -EINVAL;
865
866 if (err < 0)
867 return err;
868
869 if (msg_head->flags & TX_CP_CAN_ID) {
870
871 op->frames[i].can_id = msg_head->can_id;
872 }
873 }
874
875 } else {
876
877
878 op = kzalloc(OPSIZ, GFP_KERNEL);
879 if (!op)
880 return -ENOMEM;
881
882 op->can_id = msg_head->can_id;
883
884
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;
891 }
892 } else
893 op->frames = &op->sframe;
894
895 for (i = 0; i < msg_head->nframes; i++) {
896 err = memcpy_fromiovec((u8 *)&op->frames[i],
897 msg->msg_iov, CFSIZ);
898
899 if (op->frames[i].can_dlc > 8)
900 err = -EINVAL;
901
902 if (err < 0) {
903 if (op->frames != &op->sframe)
904 kfree(op->frames);
905 kfree(op);
906 return err;
907 }
908
909 if (msg_head->flags & TX_CP_CAN_ID) {
910
911 op->frames[i].can_id = msg_head->can_id;
912 }
913 }
914
915
916 op->last_frames = NULL;
917
918
919 op->sk = sk;
920 op->ifindex = ifindex;
921
922
923 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
924 op->timer.function = bcm_tx_timeout_handler;
925
926
927 tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
928 (unsigned long) op);
929
930
931 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
932
933
934 list_add(&op->list, &bo->tx_ops);
935
936 }
937
938 if (op->nframes != msg_head->nframes) {
939 op->nframes = msg_head->nframes;
940
941 op->currframe = 0;
942 }
943
944
945
946 op->flags = msg_head->flags;
947
948 if (op->flags & TX_RESET_MULTI_IDX) {
949
950 op->currframe = 0;
951 }
952
953 if (op->flags & SETTIMER) {
954
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);
960
961
962 if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64)
963 hrtimer_cancel(&op->timer);
964 }
965
966 if ((op->flags & STARTTIMER) &&
967 ((op->kt_ival1.tv64 && op->count) || op->kt_ival2.tv64)) {
968
969
970 op->flags |= TX_ANNOUNCE;
971
972 if (op->kt_ival1.tv64 && (op->count > 0)) {
973
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);
979 }
980
981 if (op->flags & TX_ANNOUNCE)
982 bcm_can_tx(op);
983
984 return msg_head->nframes * CFSIZ + MHSIZ;
985}
986
987
988
989
990static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
991 int ifindex, struct sock *sk)
992{
993 struct bcm_sock *bo = bcm_sk(sk);
994 struct bcm_op *op;
995 int do_rx_register;
996 int err = 0;
997
998 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
999
1000 msg_head->flags |= RX_FILTER_ID;
1001
1002 msg_head->nframes = 0;
1003 }
1004
1005
1006 if (msg_head->nframes > MAX_NFRAMES + 1)
1007 return -EINVAL;
1008
1009 if ((msg_head->flags & RX_RTR_FRAME) &&
1010 ((msg_head->nframes != 1) ||
1011 (!(msg_head->can_id & CAN_RTR_FLAG))))
1012 return -EINVAL;
1013
1014
1015 op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex);
1016 if (op) {
1017
1018
1019
1020
1021
1022
1023
1024 if (msg_head->nframes > op->nframes)
1025 return -E2BIG;
1026
1027 if (msg_head->nframes) {
1028
1029 err = memcpy_fromiovec((u8 *)op->frames,
1030 msg->msg_iov,
1031 msg_head->nframes * CFSIZ);
1032 if (err < 0)
1033 return err;
1034
1035
1036 memset(op->last_frames, 0, msg_head->nframes * CFSIZ);
1037 }
1038
1039 op->nframes = msg_head->nframes;
1040
1041
1042 do_rx_register = 0;
1043
1044 } else {
1045
1046 op = kzalloc(OPSIZ, GFP_KERNEL);
1047 if (!op)
1048 return -ENOMEM;
1049
1050 op->can_id = msg_head->can_id;
1051 op->nframes = msg_head->nframes;
1052
1053 if (msg_head->nframes > 1) {
1054
1055 op->frames = kmalloc(msg_head->nframes * CFSIZ,
1056 GFP_KERNEL);
1057 if (!op->frames) {
1058 kfree(op);
1059 return -ENOMEM;
1060 }
1061
1062
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;
1069 }
1070
1071 } else {
1072 op->frames = &op->sframe;
1073 op->last_frames = &op->last_sframe;
1074 }
1075
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;
1086 }
1087 }
1088
1089
1090 op->sk = sk;
1091 op->ifindex = ifindex;
1092
1093
1094 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1095 op->timer.function = bcm_rx_timeout_handler;
1096
1097
1098 tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
1099 (unsigned long) op);
1100
1101 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1102 op->thrtimer.function = bcm_rx_thr_handler;
1103
1104
1105 tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
1106 (unsigned long) op);
1107
1108
1109 list_add(&op->list, &bo->rx_ops);
1110
1111
1112 do_rx_register = 1;
1113
1114 }
1115
1116
1117 op->flags = msg_head->flags;
1118
1119 if (op->flags & RX_RTR_FRAME) {
1120
1121
1122 hrtimer_cancel(&op->thrtimer);
1123 hrtimer_cancel(&op->timer);
1124
1125
1126
1127
1128
1129
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;
1133
1134 } else {
1135 if (op->flags & SETTIMER) {
1136
1137
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);
1142
1143
1144 if (!op->kt_ival1.tv64)
1145 hrtimer_cancel(&op->timer);
1146
1147
1148
1149
1150
1151 op->kt_lastmsg = ktime_set(0, 0);
1152 hrtimer_cancel(&op->thrtimer);
1153 bcm_rx_thr_flush(op, 1);
1154 }
1155
1156 if ((op->flags & STARTTIMER) && op->kt_ival1.tv64)
1157 hrtimer_start(&op->timer, op->kt_ival1,
1158 HRTIMER_MODE_REL);
1159 }
1160
1161
1162 if (do_rx_register) {
1163 if (ifindex) {
1164 struct net_device *dev;
1165
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");
1172
1173 op->rx_reg_dev = dev;
1174 dev_put(dev);
1175 }
1176
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
1183 list_del(&op->list);
1184 bcm_remove_op(op);
1185 return err;
1186 }
1187 }
1188
1189 return msg_head->nframes * CFSIZ + MHSIZ;
1190}
1191
1192
1193
1194
1195static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
1196{
1197 struct sk_buff *skb;
1198 struct net_device *dev;
1199 int err;
1200
1201
1202 if (!ifindex)
1203 return -ENODEV;
1204
1205 skb = alloc_skb(CFSIZ, GFP_KERNEL);
1206
1207 if (!skb)
1208 return -ENOMEM;
1209
1210 err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
1211 if (err < 0) {
1212 kfree_skb(skb);
1213 return err;
1214 }
1215
1216 dev = dev_get_by_index(&init_net, ifindex);
1217 if (!dev) {
1218 kfree_skb(skb);
1219 return -ENODEV;
1220 }
1221
1222 skb->dev = dev;
1223 skb->sk = sk;
1224 err = can_send(skb, 1);
1225 dev_put(dev);
1226
1227 if (err)
1228 return err;
1229
1230 return CFSIZ + MHSIZ;
1231}
1232
1233
1234
1235
1236static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock,
1237 struct msghdr *msg, size_t size)
1238{
1239 struct sock *sk = sock->sk;
1240 struct bcm_sock *bo = bcm_sk(sk);
1241 int ifindex = bo->ifindex;
1242 struct bcm_msg_head msg_head;
1243 int ret;
1244
1245 if (!bo->bound)
1246 return -ENOTCONN;
1247
1248
1249 if (size < MHSIZ || (size - MHSIZ) % CFSIZ)
1250 return -EINVAL;
1251
1252
1253
1254 if (!ifindex && msg->msg_name) {
1255
1256 struct sockaddr_can *addr =
1257 (struct sockaddr_can *)msg->msg_name;
1258
1259 if (msg->msg_namelen < sizeof(*addr))
1260 return -EINVAL;
1261
1262 if (addr->can_family != AF_CAN)
1263 return -EINVAL;
1264
1265
1266 ifindex = addr->can_ifindex;
1267
1268 if (ifindex) {
1269 struct net_device *dev;
1270
1271 dev = dev_get_by_index(&init_net, ifindex);
1272 if (!dev)
1273 return -ENODEV;
1274
1275 if (dev->type != ARPHRD_CAN) {
1276 dev_put(dev);
1277 return -ENODEV;
1278 }
1279
1280 dev_put(dev);
1281 }
1282 }
1283
1284
1285
1286 ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ);
1287 if (ret < 0)
1288 return ret;
1289
1290 lock_sock(sk);
1291
1292 switch (msg_head.opcode) {
1293
1294 case TX_SETUP:
1295 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1296 break;
1297
1298 case RX_SETUP:
1299 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1300 break;
1301
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;
1308
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;
1315
1316 case TX_READ:
1317
1318 msg_head.opcode = TX_STATUS;
1319 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1320 break;
1321
1322 case RX_READ:
1323
1324 msg_head.opcode = RX_STATUS;
1325 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1326 break;
1327
1328 case TX_SEND:
1329
1330 if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ))
1331 ret = -EINVAL;
1332 else
1333 ret = bcm_tx_send(msg, ifindex, sk);
1334 break;
1335
1336 default:
1337 ret = -EINVAL;
1338 break;
1339 }
1340
1341 release_sock(sk);
1342
1343 return ret;
1344}
1345
1346
1347
1348
1349static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
1350 void *data)
1351{
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;
1357
1358 if (!net_eq(dev_net(dev), &init_net))
1359 return NOTIFY_DONE;
1360
1361 if (dev->type != ARPHRD_CAN)
1362 return NOTIFY_DONE;
1363
1364 switch (msg) {
1365
1366 case NETDEV_UNREGISTER:
1367 lock_sock(sk);
1368
1369
1370 list_for_each_entry(op, &bo->rx_ops, list)
1371 if (op->rx_reg_dev == dev)
1372 bcm_rx_unreg(dev, op);
1373
1374
1375 if (bo->bound && bo->ifindex == dev->ifindex) {
1376 bo->bound = 0;
1377 bo->ifindex = 0;
1378 notify_enodev = 1;
1379 }
1380
1381 release_sock(sk);
1382
1383 if (notify_enodev) {
1384 sk->sk_err = ENODEV;
1385 if (!sock_flag(sk, SOCK_DEAD))
1386 sk->sk_error_report(sk);
1387 }
1388 break;
1389
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);
1395 }
1396 }
1397
1398 return NOTIFY_DONE;
1399}
1400
1401
1402
1403
1404static int bcm_init(struct sock *sk)
1405{
1406 struct bcm_sock *bo = bcm_sk(sk);
1407
1408 bo->bound = 0;
1409 bo->ifindex = 0;
1410 bo->dropped_usr_msgs = 0;
1411 bo->bcm_proc_read = NULL;
1412
1413 INIT_LIST_HEAD(&bo->tx_ops);
1414 INIT_LIST_HEAD(&bo->rx_ops);
1415
1416
1417 bo->notifier.notifier_call = bcm_notifier;
1418
1419 register_netdevice_notifier(&bo->notifier);
1420
1421 return 0;
1422}
1423
1424
1425
1426
1427static int bcm_release(struct socket *sock)
1428{
1429 struct sock *sk = sock->sk;
1430 struct bcm_sock *bo = bcm_sk(sk);
1431 struct bcm_op *op, *next;
1432
1433
1434
1435 unregister_netdevice_notifier(&bo->notifier);
1436
1437 lock_sock(sk);
1438
1439 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1440 bcm_remove_op(op);
1441
1442 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1443
1444
1445
1446
1447 if (op->ifindex) {
1448
1449
1450
1451
1452
1453 if (op->rx_reg_dev) {
1454 struct net_device *dev;
1455
1456 dev = dev_get_by_index(&init_net, op->ifindex);
1457 if (dev) {
1458 bcm_rx_unreg(dev, op);
1459 dev_put(dev);
1460 }
1461 }
1462 } else
1463 can_rx_unregister(NULL, op->can_id,
1464 REGMASK(op->can_id),
1465 bcm_rx_handler, op);
1466
1467 bcm_remove_op(op);
1468 }
1469
1470
1471 if (proc_dir && bo->bcm_proc_read)
1472 remove_proc_entry(bo->procname, proc_dir);
1473
1474
1475 if (bo->bound) {
1476 bo->bound = 0;
1477 bo->ifindex = 0;
1478 }
1479
1480 sock_orphan(sk);
1481 sock->sk = NULL;
1482
1483 release_sock(sk);
1484 sock_put(sk);
1485
1486 return 0;
1487}
1488
1489static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1490 int flags)
1491{
1492 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1493 struct sock *sk = sock->sk;
1494 struct bcm_sock *bo = bcm_sk(sk);
1495
1496 if (len < sizeof(*addr))
1497 return -EINVAL;
1498
1499 if (bo->bound)
1500 return -EISCONN;
1501
1502
1503 if (addr->can_ifindex) {
1504 struct net_device *dev;
1505
1506 dev = dev_get_by_index(&init_net, addr->can_ifindex);
1507 if (!dev)
1508 return -ENODEV;
1509
1510 if (dev->type != ARPHRD_CAN) {
1511 dev_put(dev);
1512 return -ENODEV;
1513 }
1514
1515 bo->ifindex = dev->ifindex;
1516 dev_put(dev);
1517
1518 } else {
1519
1520 bo->ifindex = 0;
1521 }
1522
1523 bo->bound = 1;
1524
1525 if (proc_dir) {
1526
1527 sprintf(bo->procname, "%lu", sock_i_ino(sk));
1528 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1529 proc_dir,
1530 &bcm_proc_fops, sk);
1531 }
1532
1533 return 0;
1534}
1535
1536static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock,
1537 struct msghdr *msg, size_t size, int flags)
1538{
1539 struct sock *sk = sock->sk;
1540 struct sk_buff *skb;
1541 int error = 0;
1542 int noblock;
1543 int err;
1544
1545 noblock = flags & MSG_DONTWAIT;
1546 flags &= ~MSG_DONTWAIT;
1547 skb = skb_recv_datagram(sk, flags, noblock, &error);
1548 if (!skb)
1549 return error;
1550
1551 if (skb->len < size)
1552 size = skb->len;
1553
1554 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
1555 if (err < 0) {
1556 skb_free_datagram(sk, skb);
1557 return err;
1558 }
1559
1560 sock_recv_ts_and_drops(msg, sk, skb);
1561
1562 if (msg->msg_name) {
1563 msg->msg_namelen = sizeof(struct sockaddr_can);
1564 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1565 }
1566
1567 skb_free_datagram(sk, skb);
1568
1569 return size;
1570}
1571
1572static struct proto_ops bcm_ops __read_mostly = {
1573 .family = PF_CAN,
1574 .release = bcm_release,
1575 .bind = sock_no_bind,
1576 .connect = bcm_connect,
1577 .socketpair = sock_no_socketpair,
1578 .accept = sock_no_accept,
1579 .getname = sock_no_getname,
1580 .poll = datagram_poll,
1581 .ioctl = NULL,
1582 .listen = sock_no_listen,
1583 .shutdown = sock_no_shutdown,
1584 .setsockopt = sock_no_setsockopt,
1585 .getsockopt = sock_no_getsockopt,
1586 .sendmsg = bcm_sendmsg,
1587 .recvmsg = bcm_recvmsg,
1588 .mmap = sock_no_mmap,
1589 .sendpage = sock_no_sendpage,
1590};
1591
1592static struct proto bcm_proto __read_mostly = {
1593 .name = "CAN_BCM",
1594 .owner = THIS_MODULE,
1595 .obj_size = sizeof(struct bcm_sock),
1596 .init = bcm_init,
1597};
1598
1599static struct can_proto bcm_can_proto __read_mostly = {
1600 .type = SOCK_DGRAM,
1601 .protocol = CAN_BCM,
1602 .ops = &bcm_ops,
1603 .prot = &bcm_proto,
1604};
1605
1606static int __init bcm_module_init(void)
1607{
1608 int err;
1609
1610 printk(banner);
1611
1612 err = can_proto_register(&bcm_can_proto);
1613 if (err < 0) {
1614 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1615 return err;
1616 }
1617
1618
1619 proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
1620 return 0;
1621}
1622
1623static void __exit bcm_module_exit(void)
1624{
1625 can_proto_unregister(&bcm_can_proto);
1626
1627 if (proc_dir)
1628 proc_net_remove(&init_net, "can-bcm");
1629}
1630
1631module_init(bcm_module_init);
1632module_exit(bcm_module_exit);
1633