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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/skb.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 __initconst 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 %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");
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_DATA(inode));
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 + sizeof(struct can_skb_priv), gfp_any());
261 if (!skb)
262 goto out;
263
264 can_skb_reserve(skb);
265 can_skb_prv(skb)->ifindex = dev->ifindex;
266
267 memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
268
269
270 skb->dev = dev;
271 skb->sk = op->sk;
272 can_send(skb, 1);
273
274
275 op->currframe++;
276 op->frames_abs++;
277
278
279 if (op->currframe >= op->nframes)
280 op->currframe = 0;
281 out:
282 dev_put(dev);
283}
284
285
286
287
288
289static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
290 struct can_frame *frames, int has_timestamp)
291{
292 struct sk_buff *skb;
293 struct can_frame *firstframe;
294 struct sockaddr_can *addr;
295 struct sock *sk = op->sk;
296 unsigned int datalen = head->nframes * CFSIZ;
297 int err;
298
299 skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
300 if (!skb)
301 return;
302
303 memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
304
305 if (head->nframes) {
306
307 firstframe = (struct can_frame *)skb_tail_pointer(skb);
308
309 memcpy(skb_put(skb, datalen), frames, datalen);
310
311
312
313
314
315
316
317 if (head->nframes == 1)
318 firstframe->can_dlc &= BCM_CAN_DLC_MASK;
319 }
320
321 if (has_timestamp) {
322
323 skb->tstamp = op->rx_stamp;
324 }
325
326
327
328
329
330
331
332
333 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
334 addr = (struct sockaddr_can *)skb->cb;
335 memset(addr, 0, sizeof(*addr));
336 addr->can_family = AF_CAN;
337 addr->can_ifindex = op->rx_ifindex;
338
339 err = sock_queue_rcv_skb(sk, skb);
340 if (err < 0) {
341 struct bcm_sock *bo = bcm_sk(sk);
342
343 kfree_skb(skb);
344
345 bo->dropped_usr_msgs++;
346 }
347}
348
349static void bcm_tx_start_timer(struct bcm_op *op)
350{
351 if (op->kt_ival1.tv64 && op->count)
352 hrtimer_start(&op->timer,
353 ktime_add(ktime_get(), op->kt_ival1),
354 HRTIMER_MODE_ABS);
355 else if (op->kt_ival2.tv64)
356 hrtimer_start(&op->timer,
357 ktime_add(ktime_get(), op->kt_ival2),
358 HRTIMER_MODE_ABS);
359}
360
361static void bcm_tx_timeout_tsklet(unsigned long data)
362{
363 struct bcm_op *op = (struct bcm_op *)data;
364 struct bcm_msg_head msg_head;
365
366 if (op->kt_ival1.tv64 && (op->count > 0)) {
367
368 op->count--;
369 if (!op->count && (op->flags & TX_COUNTEVT)) {
370
371
372 msg_head.opcode = TX_EXPIRED;
373 msg_head.flags = op->flags;
374 msg_head.count = op->count;
375 msg_head.ival1 = op->ival1;
376 msg_head.ival2 = op->ival2;
377 msg_head.can_id = op->can_id;
378 msg_head.nframes = 0;
379
380 bcm_send_to_user(op, &msg_head, NULL, 0);
381 }
382 bcm_can_tx(op);
383
384 } else if (op->kt_ival2.tv64)
385 bcm_can_tx(op);
386
387 bcm_tx_start_timer(op);
388}
389
390
391
392
393static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer)
394{
395 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
396
397 tasklet_schedule(&op->tsklet);
398
399 return HRTIMER_NORESTART;
400}
401
402
403
404
405static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data)
406{
407 struct bcm_msg_head head;
408
409
410 op->frames_filtered++;
411
412
413 if (op->frames_filtered > ULONG_MAX/100)
414 op->frames_filtered = op->frames_abs = 0;
415
416
417 data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV);
418
419 head.opcode = RX_CHANGED;
420 head.flags = op->flags;
421 head.count = op->count;
422 head.ival1 = op->ival1;
423 head.ival2 = op->ival2;
424 head.can_id = op->can_id;
425 head.nframes = 1;
426
427 bcm_send_to_user(op, &head, data, 1);
428}
429
430
431
432
433
434
435static void bcm_rx_update_and_send(struct bcm_op *op,
436 struct can_frame *lastdata,
437 const struct can_frame *rxdata)
438{
439 memcpy(lastdata, rxdata, CFSIZ);
440
441
442 lastdata->can_dlc |= (RX_RECV|RX_THR);
443
444
445 if (!op->kt_ival2.tv64) {
446
447 bcm_rx_changed(op, lastdata);
448 return;
449 }
450
451
452 if (hrtimer_active(&op->thrtimer))
453 return;
454
455
456 if (!op->kt_lastmsg.tv64)
457 goto rx_changed_settime;
458
459
460 if (ktime_us_delta(ktime_get(), op->kt_lastmsg) <
461 ktime_to_us(op->kt_ival2)) {
462
463 hrtimer_start(&op->thrtimer,
464 ktime_add(op->kt_lastmsg, op->kt_ival2),
465 HRTIMER_MODE_ABS);
466 return;
467 }
468
469
470rx_changed_settime:
471 bcm_rx_changed(op, lastdata);
472 op->kt_lastmsg = ktime_get();
473}
474
475
476
477
478
479static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index,
480 const struct can_frame *rxdata)
481{
482
483
484
485
486
487 if (!(op->last_frames[index].can_dlc & RX_RECV)) {
488
489 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
490 return;
491 }
492
493
494
495 if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) !=
496 (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) {
497 bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
498 return;
499 }
500
501 if (op->flags & RX_CHECK_DLC) {
502
503 if (rxdata->can_dlc != (op->last_frames[index].can_dlc &
504 BCM_CAN_DLC_MASK)) {
505 bcm_rx_update_and_send(op, &op->last_frames[index],
506 rxdata);
507 return;
508 }
509 }
510}
511
512
513
514
515static void bcm_rx_starttimer(struct bcm_op *op)
516{
517 if (op->flags & RX_NO_AUTOTIMER)
518 return;
519
520 if (op->kt_ival1.tv64)
521 hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL);
522}
523
524static void bcm_rx_timeout_tsklet(unsigned long data)
525{
526 struct bcm_op *op = (struct bcm_op *)data;
527 struct bcm_msg_head msg_head;
528
529
530 msg_head.opcode = RX_TIMEOUT;
531 msg_head.flags = op->flags;
532 msg_head.count = op->count;
533 msg_head.ival1 = op->ival1;
534 msg_head.ival2 = op->ival2;
535 msg_head.can_id = op->can_id;
536 msg_head.nframes = 0;
537
538 bcm_send_to_user(op, &msg_head, NULL, 0);
539}
540
541
542
543
544static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer)
545{
546 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
547
548
549 tasklet_hi_schedule(&op->tsklet);
550
551
552
553
554 if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) {
555
556 memset(op->last_frames, 0, op->nframes * CFSIZ);
557 }
558
559 return HRTIMER_NORESTART;
560}
561
562
563
564
565static inline int bcm_rx_do_flush(struct bcm_op *op, int update,
566 unsigned int index)
567{
568 if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) {
569 if (update)
570 bcm_rx_changed(op, &op->last_frames[index]);
571 return 1;
572 }
573 return 0;
574}
575
576
577
578
579
580
581
582static int bcm_rx_thr_flush(struct bcm_op *op, int update)
583{
584 int updated = 0;
585
586 if (op->nframes > 1) {
587 unsigned int i;
588
589
590 for (i = 1; i < op->nframes; i++)
591 updated += bcm_rx_do_flush(op, update, i);
592
593 } else {
594
595 updated += bcm_rx_do_flush(op, update, 0);
596 }
597
598 return updated;
599}
600
601static void bcm_rx_thr_tsklet(unsigned long data)
602{
603 struct bcm_op *op = (struct bcm_op *)data;
604
605
606 bcm_rx_thr_flush(op, 1);
607}
608
609
610
611
612
613static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer)
614{
615 struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer);
616
617 tasklet_schedule(&op->thrtsklet);
618
619 if (bcm_rx_thr_flush(op, 0)) {
620 hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2);
621 return HRTIMER_RESTART;
622 } else {
623
624 op->kt_lastmsg = ktime_set(0, 0);
625 return HRTIMER_NORESTART;
626 }
627}
628
629
630
631
632static void bcm_rx_handler(struct sk_buff *skb, void *data)
633{
634 struct bcm_op *op = (struct bcm_op *)data;
635 const struct can_frame *rxframe = (struct can_frame *)skb->data;
636 unsigned int i;
637
638
639 hrtimer_cancel(&op->timer);
640
641 if (op->can_id != rxframe->can_id)
642 return;
643
644
645 op->rx_stamp = skb->tstamp;
646
647 op->rx_ifindex = skb->dev->ifindex;
648
649 op->frames_abs++;
650
651 if (op->flags & RX_RTR_FRAME) {
652
653 bcm_can_tx(op);
654 return;
655 }
656
657 if (op->flags & RX_FILTER_ID) {
658
659 bcm_rx_update_and_send(op, &op->last_frames[0], rxframe);
660 goto rx_starttimer;
661 }
662
663 if (op->nframes == 1) {
664
665 bcm_rx_cmp_to_index(op, 0, rxframe);
666 goto rx_starttimer;
667 }
668
669 if (op->nframes > 1) {
670
671
672
673
674
675
676
677 for (i = 1; i < op->nframes; i++) {
678 if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) ==
679 (GET_U64(&op->frames[0]) &
680 GET_U64(&op->frames[i]))) {
681 bcm_rx_cmp_to_index(op, i, rxframe);
682 break;
683 }
684 }
685 }
686
687rx_starttimer:
688 bcm_rx_starttimer(op);
689}
690
691
692
693
694static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id,
695 int ifindex)
696{
697 struct bcm_op *op;
698
699 list_for_each_entry(op, ops, list) {
700 if ((op->can_id == can_id) && (op->ifindex == ifindex))
701 return op;
702 }
703
704 return NULL;
705}
706
707static void bcm_remove_op(struct bcm_op *op)
708{
709 hrtimer_cancel(&op->timer);
710 hrtimer_cancel(&op->thrtimer);
711
712 if (op->tsklet.func)
713 tasklet_kill(&op->tsklet);
714
715 if (op->thrtsklet.func)
716 tasklet_kill(&op->thrtsklet);
717
718 if ((op->frames) && (op->frames != &op->sframe))
719 kfree(op->frames);
720
721 if ((op->last_frames) && (op->last_frames != &op->last_sframe))
722 kfree(op->last_frames);
723
724 kfree(op);
725}
726
727static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
728{
729 if (op->rx_reg_dev == dev) {
730 can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
731 bcm_rx_handler, op);
732
733
734 op->rx_reg_dev = NULL;
735 } else
736 printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device "
737 "mismatch %p %p\n", op->rx_reg_dev, dev);
738}
739
740
741
742
743static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex)
744{
745 struct bcm_op *op, *n;
746
747 list_for_each_entry_safe(op, n, ops, list) {
748 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
749
750
751
752
753
754
755 if (op->ifindex) {
756
757
758
759
760
761 if (op->rx_reg_dev) {
762 struct net_device *dev;
763
764 dev = dev_get_by_index(&init_net,
765 op->ifindex);
766 if (dev) {
767 bcm_rx_unreg(dev, op);
768 dev_put(dev);
769 }
770 }
771 } else
772 can_rx_unregister(NULL, op->can_id,
773 REGMASK(op->can_id),
774 bcm_rx_handler, op);
775
776 list_del(&op->list);
777 bcm_remove_op(op);
778 return 1;
779 }
780 }
781
782 return 0;
783}
784
785
786
787
788static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex)
789{
790 struct bcm_op *op, *n;
791
792 list_for_each_entry_safe(op, n, ops, list) {
793 if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
794 list_del(&op->list);
795 bcm_remove_op(op);
796 return 1;
797 }
798 }
799
800 return 0;
801}
802
803
804
805
806static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
807 int ifindex)
808{
809 struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex);
810
811 if (!op)
812 return -EINVAL;
813
814
815 msg_head->flags = op->flags;
816 msg_head->count = op->count;
817 msg_head->ival1 = op->ival1;
818 msg_head->ival2 = op->ival2;
819 msg_head->nframes = op->nframes;
820
821 bcm_send_to_user(op, msg_head, op->frames, 0);
822
823 return MHSIZ;
824}
825
826
827
828
829static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
830 int ifindex, struct sock *sk)
831{
832 struct bcm_sock *bo = bcm_sk(sk);
833 struct bcm_op *op;
834 unsigned int i;
835 int err;
836
837
838 if (!ifindex)
839 return -ENODEV;
840
841
842 if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
843 return -EINVAL;
844
845
846 op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex);
847
848 if (op) {
849
850
851
852
853
854
855
856 if (msg_head->nframes > op->nframes)
857 return -E2BIG;
858
859
860 for (i = 0; i < msg_head->nframes; i++) {
861 err = memcpy_fromiovec((u8 *)&op->frames[i],
862 msg->msg_iov, CFSIZ);
863
864 if (op->frames[i].can_dlc > 8)
865 err = -EINVAL;
866
867 if (err < 0)
868 return err;
869
870 if (msg_head->flags & TX_CP_CAN_ID) {
871
872 op->frames[i].can_id = msg_head->can_id;
873 }
874 }
875
876 } else {
877
878
879 op = kzalloc(OPSIZ, GFP_KERNEL);
880 if (!op)
881 return -ENOMEM;
882
883 op->can_id = msg_head->can_id;
884
885
886 if (msg_head->nframes > 1) {
887 op->frames = kmalloc(msg_head->nframes * CFSIZ,
888 GFP_KERNEL);
889 if (!op->frames) {
890 kfree(op);
891 return -ENOMEM;
892 }
893 } else
894 op->frames = &op->sframe;
895
896 for (i = 0; i < msg_head->nframes; i++) {
897 err = memcpy_fromiovec((u8 *)&op->frames[i],
898 msg->msg_iov, CFSIZ);
899
900 if (op->frames[i].can_dlc > 8)
901 err = -EINVAL;
902
903 if (err < 0) {
904 if (op->frames != &op->sframe)
905 kfree(op->frames);
906 kfree(op);
907 return err;
908 }
909
910 if (msg_head->flags & TX_CP_CAN_ID) {
911
912 op->frames[i].can_id = msg_head->can_id;
913 }
914 }
915
916
917 op->last_frames = NULL;
918
919
920 op->sk = sk;
921 op->ifindex = ifindex;
922
923
924 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
925 op->timer.function = bcm_tx_timeout_handler;
926
927
928 tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
929 (unsigned long) op);
930
931
932 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
933
934
935 list_add(&op->list, &bo->tx_ops);
936
937 }
938
939 if (op->nframes != msg_head->nframes) {
940 op->nframes = msg_head->nframes;
941
942 op->currframe = 0;
943 }
944
945
946
947 op->flags = msg_head->flags;
948
949 if (op->flags & TX_RESET_MULTI_IDX) {
950
951 op->currframe = 0;
952 }
953
954 if (op->flags & SETTIMER) {
955
956 op->count = msg_head->count;
957 op->ival1 = msg_head->ival1;
958 op->ival2 = msg_head->ival2;
959 op->kt_ival1 = timeval_to_ktime(msg_head->ival1);
960 op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
961
962
963 if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64)
964 hrtimer_cancel(&op->timer);
965 }
966
967 if (op->flags & STARTTIMER) {
968 hrtimer_cancel(&op->timer);
969
970 op->flags |= TX_ANNOUNCE;
971 }
972
973 if (op->flags & TX_ANNOUNCE) {
974 bcm_can_tx(op);
975 if (op->count)
976 op->count--;
977 }
978
979 if (op->flags & STARTTIMER)
980 bcm_tx_start_timer(op);
981
982 return msg_head->nframes * CFSIZ + MHSIZ;
983}
984
985
986
987
988static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
989 int ifindex, struct sock *sk)
990{
991 struct bcm_sock *bo = bcm_sk(sk);
992 struct bcm_op *op;
993 int do_rx_register;
994 int err = 0;
995
996 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
997
998 msg_head->flags |= RX_FILTER_ID;
999
1000 msg_head->nframes = 0;
1001 }
1002
1003
1004 if (msg_head->nframes > MAX_NFRAMES + 1)
1005 return -EINVAL;
1006
1007 if ((msg_head->flags & RX_RTR_FRAME) &&
1008 ((msg_head->nframes != 1) ||
1009 (!(msg_head->can_id & CAN_RTR_FLAG))))
1010 return -EINVAL;
1011
1012
1013 op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex);
1014 if (op) {
1015
1016
1017
1018
1019
1020
1021
1022 if (msg_head->nframes > op->nframes)
1023 return -E2BIG;
1024
1025 if (msg_head->nframes) {
1026
1027 err = memcpy_fromiovec((u8 *)op->frames,
1028 msg->msg_iov,
1029 msg_head->nframes * CFSIZ);
1030 if (err < 0)
1031 return err;
1032
1033
1034 memset(op->last_frames, 0, msg_head->nframes * CFSIZ);
1035 }
1036
1037 op->nframes = msg_head->nframes;
1038
1039
1040 do_rx_register = 0;
1041
1042 } else {
1043
1044 op = kzalloc(OPSIZ, GFP_KERNEL);
1045 if (!op)
1046 return -ENOMEM;
1047
1048 op->can_id = msg_head->can_id;
1049 op->nframes = msg_head->nframes;
1050
1051 if (msg_head->nframes > 1) {
1052
1053 op->frames = kmalloc(msg_head->nframes * CFSIZ,
1054 GFP_KERNEL);
1055 if (!op->frames) {
1056 kfree(op);
1057 return -ENOMEM;
1058 }
1059
1060
1061 op->last_frames = kzalloc(msg_head->nframes * CFSIZ,
1062 GFP_KERNEL);
1063 if (!op->last_frames) {
1064 kfree(op->frames);
1065 kfree(op);
1066 return -ENOMEM;
1067 }
1068
1069 } else {
1070 op->frames = &op->sframe;
1071 op->last_frames = &op->last_sframe;
1072 }
1073
1074 if (msg_head->nframes) {
1075 err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov,
1076 msg_head->nframes * CFSIZ);
1077 if (err < 0) {
1078 if (op->frames != &op->sframe)
1079 kfree(op->frames);
1080 if (op->last_frames != &op->last_sframe)
1081 kfree(op->last_frames);
1082 kfree(op);
1083 return err;
1084 }
1085 }
1086
1087
1088 op->sk = sk;
1089 op->ifindex = ifindex;
1090
1091
1092 op->rx_ifindex = ifindex;
1093
1094
1095 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1096 op->timer.function = bcm_rx_timeout_handler;
1097
1098
1099 tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
1100 (unsigned long) op);
1101
1102 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1103 op->thrtimer.function = bcm_rx_thr_handler;
1104
1105
1106 tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
1107 (unsigned long) op);
1108
1109
1110 list_add(&op->list, &bo->rx_ops);
1111
1112
1113 do_rx_register = 1;
1114
1115 }
1116
1117
1118 op->flags = msg_head->flags;
1119
1120 if (op->flags & RX_RTR_FRAME) {
1121
1122
1123 hrtimer_cancel(&op->thrtimer);
1124 hrtimer_cancel(&op->timer);
1125
1126
1127
1128
1129
1130
1131 if ((op->flags & TX_CP_CAN_ID) ||
1132 (op->frames[0].can_id == op->can_id))
1133 op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG;
1134
1135 } else {
1136 if (op->flags & SETTIMER) {
1137
1138
1139 op->ival1 = msg_head->ival1;
1140 op->ival2 = msg_head->ival2;
1141 op->kt_ival1 = timeval_to_ktime(msg_head->ival1);
1142 op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
1143
1144
1145 if (!op->kt_ival1.tv64)
1146 hrtimer_cancel(&op->timer);
1147
1148
1149
1150
1151
1152 op->kt_lastmsg = ktime_set(0, 0);
1153 hrtimer_cancel(&op->thrtimer);
1154 bcm_rx_thr_flush(op, 1);
1155 }
1156
1157 if ((op->flags & STARTTIMER) && op->kt_ival1.tv64)
1158 hrtimer_start(&op->timer, op->kt_ival1,
1159 HRTIMER_MODE_REL);
1160 }
1161
1162
1163 if (do_rx_register) {
1164 if (ifindex) {
1165 struct net_device *dev;
1166
1167 dev = dev_get_by_index(&init_net, ifindex);
1168 if (dev) {
1169 err = can_rx_register(dev, op->can_id,
1170 REGMASK(op->can_id),
1171 bcm_rx_handler, op,
1172 "bcm");
1173
1174 op->rx_reg_dev = dev;
1175 dev_put(dev);
1176 }
1177
1178 } else
1179 err = can_rx_register(NULL, op->can_id,
1180 REGMASK(op->can_id),
1181 bcm_rx_handler, op, "bcm");
1182 if (err) {
1183
1184 list_del(&op->list);
1185 bcm_remove_op(op);
1186 return err;
1187 }
1188 }
1189
1190 return msg_head->nframes * CFSIZ + MHSIZ;
1191}
1192
1193
1194
1195
1196static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
1197{
1198 struct sk_buff *skb;
1199 struct net_device *dev;
1200 int err;
1201
1202
1203 if (!ifindex)
1204 return -ENODEV;
1205
1206 skb = alloc_skb(CFSIZ + sizeof(struct can_skb_priv), GFP_KERNEL);
1207 if (!skb)
1208 return -ENOMEM;
1209
1210 can_skb_reserve(skb);
1211
1212 err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
1213 if (err < 0) {
1214 kfree_skb(skb);
1215 return err;
1216 }
1217
1218 dev = dev_get_by_index(&init_net, ifindex);
1219 if (!dev) {
1220 kfree_skb(skb);
1221 return -ENODEV;
1222 }
1223
1224 can_skb_prv(skb)->ifindex = dev->ifindex;
1225 skb->dev = dev;
1226 skb->sk = sk;
1227 err = can_send(skb, 1);
1228 dev_put(dev);
1229
1230 if (err)
1231 return err;
1232
1233 return CFSIZ + MHSIZ;
1234}
1235
1236
1237
1238
1239static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock,
1240 struct msghdr *msg, size_t size)
1241{
1242 struct sock *sk = sock->sk;
1243 struct bcm_sock *bo = bcm_sk(sk);
1244 int ifindex = bo->ifindex;
1245 struct bcm_msg_head msg_head;
1246 int ret;
1247
1248 if (!bo->bound)
1249 return -ENOTCONN;
1250
1251
1252 if (size < MHSIZ || (size - MHSIZ) % CFSIZ)
1253 return -EINVAL;
1254
1255
1256
1257 if (!ifindex && msg->msg_name) {
1258
1259 struct sockaddr_can *addr =
1260 (struct sockaddr_can *)msg->msg_name;
1261
1262 if (msg->msg_namelen < sizeof(*addr))
1263 return -EINVAL;
1264
1265 if (addr->can_family != AF_CAN)
1266 return -EINVAL;
1267
1268
1269 ifindex = addr->can_ifindex;
1270
1271 if (ifindex) {
1272 struct net_device *dev;
1273
1274 dev = dev_get_by_index(&init_net, ifindex);
1275 if (!dev)
1276 return -ENODEV;
1277
1278 if (dev->type != ARPHRD_CAN) {
1279 dev_put(dev);
1280 return -ENODEV;
1281 }
1282
1283 dev_put(dev);
1284 }
1285 }
1286
1287
1288
1289 ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ);
1290 if (ret < 0)
1291 return ret;
1292
1293 lock_sock(sk);
1294
1295 switch (msg_head.opcode) {
1296
1297 case TX_SETUP:
1298 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1299 break;
1300
1301 case RX_SETUP:
1302 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1303 break;
1304
1305 case TX_DELETE:
1306 if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex))
1307 ret = MHSIZ;
1308 else
1309 ret = -EINVAL;
1310 break;
1311
1312 case RX_DELETE:
1313 if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex))
1314 ret = MHSIZ;
1315 else
1316 ret = -EINVAL;
1317 break;
1318
1319 case TX_READ:
1320
1321 msg_head.opcode = TX_STATUS;
1322 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1323 break;
1324
1325 case RX_READ:
1326
1327 msg_head.opcode = RX_STATUS;
1328 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1329 break;
1330
1331 case TX_SEND:
1332
1333 if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ))
1334 ret = -EINVAL;
1335 else
1336 ret = bcm_tx_send(msg, ifindex, sk);
1337 break;
1338
1339 default:
1340 ret = -EINVAL;
1341 break;
1342 }
1343
1344 release_sock(sk);
1345
1346 return ret;
1347}
1348
1349
1350
1351
1352static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
1353 void *ptr)
1354{
1355 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1356 struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
1357 struct sock *sk = &bo->sk;
1358 struct bcm_op *op;
1359 int notify_enodev = 0;
1360
1361 if (!net_eq(dev_net(dev), &init_net))
1362 return NOTIFY_DONE;
1363
1364 if (dev->type != ARPHRD_CAN)
1365 return NOTIFY_DONE;
1366
1367 switch (msg) {
1368
1369 case NETDEV_UNREGISTER:
1370 lock_sock(sk);
1371
1372
1373 list_for_each_entry(op, &bo->rx_ops, list)
1374 if (op->rx_reg_dev == dev)
1375 bcm_rx_unreg(dev, op);
1376
1377
1378 if (bo->bound && bo->ifindex == dev->ifindex) {
1379 bo->bound = 0;
1380 bo->ifindex = 0;
1381 notify_enodev = 1;
1382 }
1383
1384 release_sock(sk);
1385
1386 if (notify_enodev) {
1387 sk->sk_err = ENODEV;
1388 if (!sock_flag(sk, SOCK_DEAD))
1389 sk->sk_error_report(sk);
1390 }
1391 break;
1392
1393 case NETDEV_DOWN:
1394 if (bo->bound && bo->ifindex == dev->ifindex) {
1395 sk->sk_err = ENETDOWN;
1396 if (!sock_flag(sk, SOCK_DEAD))
1397 sk->sk_error_report(sk);
1398 }
1399 }
1400
1401 return NOTIFY_DONE;
1402}
1403
1404
1405
1406
1407static int bcm_init(struct sock *sk)
1408{
1409 struct bcm_sock *bo = bcm_sk(sk);
1410
1411 bo->bound = 0;
1412 bo->ifindex = 0;
1413 bo->dropped_usr_msgs = 0;
1414 bo->bcm_proc_read = NULL;
1415
1416 INIT_LIST_HEAD(&bo->tx_ops);
1417 INIT_LIST_HEAD(&bo->rx_ops);
1418
1419
1420 bo->notifier.notifier_call = bcm_notifier;
1421
1422 register_netdevice_notifier(&bo->notifier);
1423
1424 return 0;
1425}
1426
1427
1428
1429
1430static int bcm_release(struct socket *sock)
1431{
1432 struct sock *sk = sock->sk;
1433 struct bcm_sock *bo;
1434 struct bcm_op *op, *next;
1435
1436 if (sk == NULL)
1437 return 0;
1438
1439 bo = bcm_sk(sk);
1440
1441
1442
1443 unregister_netdevice_notifier(&bo->notifier);
1444
1445 lock_sock(sk);
1446
1447 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1448 bcm_remove_op(op);
1449
1450 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1451
1452
1453
1454
1455 if (op->ifindex) {
1456
1457
1458
1459
1460
1461 if (op->rx_reg_dev) {
1462 struct net_device *dev;
1463
1464 dev = dev_get_by_index(&init_net, op->ifindex);
1465 if (dev) {
1466 bcm_rx_unreg(dev, op);
1467 dev_put(dev);
1468 }
1469 }
1470 } else
1471 can_rx_unregister(NULL, op->can_id,
1472 REGMASK(op->can_id),
1473 bcm_rx_handler, op);
1474
1475 bcm_remove_op(op);
1476 }
1477
1478
1479 if (proc_dir && bo->bcm_proc_read)
1480 remove_proc_entry(bo->procname, proc_dir);
1481
1482
1483 if (bo->bound) {
1484 bo->bound = 0;
1485 bo->ifindex = 0;
1486 }
1487
1488 sock_orphan(sk);
1489 sock->sk = NULL;
1490
1491 release_sock(sk);
1492 sock_put(sk);
1493
1494 return 0;
1495}
1496
1497static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1498 int flags)
1499{
1500 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1501 struct sock *sk = sock->sk;
1502 struct bcm_sock *bo = bcm_sk(sk);
1503
1504 if (len < sizeof(*addr))
1505 return -EINVAL;
1506
1507 if (bo->bound)
1508 return -EISCONN;
1509
1510
1511 if (addr->can_ifindex) {
1512 struct net_device *dev;
1513
1514 dev = dev_get_by_index(&init_net, addr->can_ifindex);
1515 if (!dev)
1516 return -ENODEV;
1517
1518 if (dev->type != ARPHRD_CAN) {
1519 dev_put(dev);
1520 return -ENODEV;
1521 }
1522
1523 bo->ifindex = dev->ifindex;
1524 dev_put(dev);
1525
1526 } else {
1527
1528 bo->ifindex = 0;
1529 }
1530
1531 bo->bound = 1;
1532
1533 if (proc_dir) {
1534
1535 sprintf(bo->procname, "%lu", sock_i_ino(sk));
1536 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1537 proc_dir,
1538 &bcm_proc_fops, sk);
1539 }
1540
1541 return 0;
1542}
1543
1544static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock,
1545 struct msghdr *msg, size_t size, int flags)
1546{
1547 struct sock *sk = sock->sk;
1548 struct sk_buff *skb;
1549 int error = 0;
1550 int noblock;
1551 int err;
1552
1553 noblock = flags & MSG_DONTWAIT;
1554 flags &= ~MSG_DONTWAIT;
1555 skb = skb_recv_datagram(sk, flags, noblock, &error);
1556 if (!skb)
1557 return error;
1558
1559 if (skb->len < size)
1560 size = skb->len;
1561
1562 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
1563 if (err < 0) {
1564 skb_free_datagram(sk, skb);
1565 return err;
1566 }
1567
1568 sock_recv_ts_and_drops(msg, sk, skb);
1569
1570 if (msg->msg_name) {
1571 msg->msg_namelen = sizeof(struct sockaddr_can);
1572 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1573 }
1574
1575 skb_free_datagram(sk, skb);
1576
1577 return size;
1578}
1579
1580static const struct proto_ops bcm_ops = {
1581 .family = PF_CAN,
1582 .release = bcm_release,
1583 .bind = sock_no_bind,
1584 .connect = bcm_connect,
1585 .socketpair = sock_no_socketpair,
1586 .accept = sock_no_accept,
1587 .getname = sock_no_getname,
1588 .poll = datagram_poll,
1589 .ioctl = can_ioctl,
1590 .listen = sock_no_listen,
1591 .shutdown = sock_no_shutdown,
1592 .setsockopt = sock_no_setsockopt,
1593 .getsockopt = sock_no_getsockopt,
1594 .sendmsg = bcm_sendmsg,
1595 .recvmsg = bcm_recvmsg,
1596 .mmap = sock_no_mmap,
1597 .sendpage = sock_no_sendpage,
1598};
1599
1600static struct proto bcm_proto __read_mostly = {
1601 .name = "CAN_BCM",
1602 .owner = THIS_MODULE,
1603 .obj_size = sizeof(struct bcm_sock),
1604 .init = bcm_init,
1605};
1606
1607static const struct can_proto bcm_can_proto = {
1608 .type = SOCK_DGRAM,
1609 .protocol = CAN_BCM,
1610 .ops = &bcm_ops,
1611 .prot = &bcm_proto,
1612};
1613
1614static int __init bcm_module_init(void)
1615{
1616 int err;
1617
1618 printk(banner);
1619
1620 err = can_proto_register(&bcm_can_proto);
1621 if (err < 0) {
1622 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1623 return err;
1624 }
1625
1626
1627 proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
1628 return 0;
1629}
1630
1631static void __exit bcm_module_exit(void)
1632{
1633 can_proto_unregister(&bcm_can_proto);
1634
1635 if (proc_dir)
1636 remove_proc_entry("can-bcm", init_net.proc_net);
1637}
1638
1639module_init(bcm_module_init);
1640module_exit(bcm_module_exit);
1641