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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_FLAGS_MASK 0x3F
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 "20161123"
81
82MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
83MODULE_LICENSE("Dual BSD/GPL");
84MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
85MODULE_ALIAS("can-proto-2");
86
87
88
89
90
91
92static inline u64 get_u64(const struct canfd_frame *cp, int offset)
93{
94 return *(u64 *)(cp->data + offset);
95}
96
97struct bcm_op {
98 struct list_head list;
99 int ifindex;
100 canid_t can_id;
101 u32 flags;
102 unsigned long frames_abs, frames_filtered;
103 struct bcm_timeval ival1, ival2;
104 struct hrtimer timer, thrtimer;
105 struct tasklet_struct tsklet, thrtsklet;
106 ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg;
107 int rx_ifindex;
108 int cfsiz;
109 u32 count;
110 u32 nframes;
111 u32 currframe;
112
113 void *frames;
114 void *last_frames;
115 struct canfd_frame sframe;
116 struct canfd_frame last_sframe;
117 struct sock *sk;
118 struct net_device *rx_reg_dev;
119};
120
121static struct proc_dir_entry *proc_dir;
122
123struct bcm_sock {
124 struct sock sk;
125 int bound;
126 int ifindex;
127 struct notifier_block notifier;
128 struct list_head rx_ops;
129 struct list_head tx_ops;
130 unsigned long dropped_usr_msgs;
131 struct proc_dir_entry *bcm_proc_read;
132 char procname [32];
133};
134
135static inline struct bcm_sock *bcm_sk(const struct sock *sk)
136{
137 return (struct bcm_sock *)sk;
138}
139
140static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv)
141{
142 return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC);
143}
144
145#define CFSIZ(flags) ((flags & CAN_FD_FRAME) ? CANFD_MTU : CAN_MTU)
146#define OPSIZ sizeof(struct bcm_op)
147#define MHSIZ sizeof(struct bcm_msg_head)
148
149
150
151
152static char *bcm_proc_getifname(char *result, int ifindex)
153{
154 struct net_device *dev;
155
156 if (!ifindex)
157 return "any";
158
159 rcu_read_lock();
160 dev = dev_get_by_index_rcu(&init_net, ifindex);
161 if (dev)
162 strcpy(result, dev->name);
163 else
164 strcpy(result, "???");
165 rcu_read_unlock();
166
167 return result;
168}
169
170static int bcm_proc_show(struct seq_file *m, void *v)
171{
172 char ifname[IFNAMSIZ];
173 struct sock *sk = (struct sock *)m->private;
174 struct bcm_sock *bo = bcm_sk(sk);
175 struct bcm_op *op;
176
177 seq_printf(m, ">>> socket %pK", sk->sk_socket);
178 seq_printf(m, " / sk %pK", sk);
179 seq_printf(m, " / bo %pK", bo);
180 seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs);
181 seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex));
182 seq_printf(m, " <<<\n");
183
184 list_for_each_entry(op, &bo->rx_ops, list) {
185
186 unsigned long reduction;
187
188
189 if (!op->frames_abs)
190 continue;
191
192 seq_printf(m, "rx_op: %03X %-5s ", op->can_id,
193 bcm_proc_getifname(ifname, op->ifindex));
194
195 if (op->flags & CAN_FD_FRAME)
196 seq_printf(m, "(%u)", op->nframes);
197 else
198 seq_printf(m, "[%u]", op->nframes);
199
200 seq_printf(m, "%c ", (op->flags & RX_CHECK_DLC) ? 'd' : ' ');
201
202 if (op->kt_ival1.tv64)
203 seq_printf(m, "timeo=%lld ",
204 (long long)ktime_to_us(op->kt_ival1));
205
206 if (op->kt_ival2.tv64)
207 seq_printf(m, "thr=%lld ",
208 (long long)ktime_to_us(op->kt_ival2));
209
210 seq_printf(m, "# recv %ld (%ld) => reduction: ",
211 op->frames_filtered, op->frames_abs);
212
213 reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
214
215 seq_printf(m, "%s%ld%%\n",
216 (reduction == 100) ? "near " : "", reduction);
217 }
218
219 list_for_each_entry(op, &bo->tx_ops, list) {
220
221 seq_printf(m, "tx_op: %03X %s ", op->can_id,
222 bcm_proc_getifname(ifname, op->ifindex));
223
224 if (op->flags & CAN_FD_FRAME)
225 seq_printf(m, "(%u) ", op->nframes);
226 else
227 seq_printf(m, "[%u] ", op->nframes);
228
229 if (op->kt_ival1.tv64)
230 seq_printf(m, "t1=%lld ",
231 (long long)ktime_to_us(op->kt_ival1));
232
233 if (op->kt_ival2.tv64)
234 seq_printf(m, "t2=%lld ",
235 (long long)ktime_to_us(op->kt_ival2));
236
237 seq_printf(m, "# sent %ld\n", op->frames_abs);
238 }
239 seq_putc(m, '\n');
240 return 0;
241}
242
243static int bcm_proc_open(struct inode *inode, struct file *file)
244{
245 return single_open(file, bcm_proc_show, PDE_DATA(inode));
246}
247
248static const struct file_operations bcm_proc_fops = {
249 .owner = THIS_MODULE,
250 .open = bcm_proc_open,
251 .read = seq_read,
252 .llseek = seq_lseek,
253 .release = single_release,
254};
255
256
257
258
259
260static void bcm_can_tx(struct bcm_op *op)
261{
262 struct sk_buff *skb;
263 struct net_device *dev;
264 struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe;
265
266
267 if (!op->ifindex)
268 return;
269
270 dev = dev_get_by_index(&init_net, op->ifindex);
271 if (!dev) {
272
273 return;
274 }
275
276 skb = alloc_skb(op->cfsiz + sizeof(struct can_skb_priv), gfp_any());
277 if (!skb)
278 goto out;
279
280 can_skb_reserve(skb);
281 can_skb_prv(skb)->ifindex = dev->ifindex;
282 can_skb_prv(skb)->skbcnt = 0;
283
284 memcpy(skb_put(skb, op->cfsiz), cf, op->cfsiz);
285
286
287 skb->dev = dev;
288 can_skb_set_owner(skb, op->sk);
289 can_send(skb, 1);
290
291
292 op->currframe++;
293 op->frames_abs++;
294
295
296 if (op->currframe >= op->nframes)
297 op->currframe = 0;
298out:
299 dev_put(dev);
300}
301
302
303
304
305
306static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
307 struct canfd_frame *frames, int has_timestamp)
308{
309 struct sk_buff *skb;
310 struct canfd_frame *firstframe;
311 struct sockaddr_can *addr;
312 struct sock *sk = op->sk;
313 unsigned int datalen = head->nframes * op->cfsiz;
314 int err;
315
316 skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
317 if (!skb)
318 return;
319
320 memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
321
322 if (head->nframes) {
323
324 firstframe = (struct canfd_frame *)skb_tail_pointer(skb);
325
326 memcpy(skb_put(skb, datalen), frames, datalen);
327
328
329
330
331
332
333
334 if (head->nframes == 1)
335 firstframe->flags &= BCM_CAN_FLAGS_MASK;
336 }
337
338 if (has_timestamp) {
339
340 skb->tstamp = op->rx_stamp;
341 }
342
343
344
345
346
347
348
349
350 sock_skb_cb_check_size(sizeof(struct sockaddr_can));
351 addr = (struct sockaddr_can *)skb->cb;
352 memset(addr, 0, sizeof(*addr));
353 addr->can_family = AF_CAN;
354 addr->can_ifindex = op->rx_ifindex;
355
356 err = sock_queue_rcv_skb(sk, skb);
357 if (err < 0) {
358 struct bcm_sock *bo = bcm_sk(sk);
359
360 kfree_skb(skb);
361
362 bo->dropped_usr_msgs++;
363 }
364}
365
366static void bcm_tx_start_timer(struct bcm_op *op)
367{
368 if (op->kt_ival1.tv64 && op->count)
369 hrtimer_start(&op->timer,
370 ktime_add(ktime_get(), op->kt_ival1),
371 HRTIMER_MODE_ABS);
372 else if (op->kt_ival2.tv64)
373 hrtimer_start(&op->timer,
374 ktime_add(ktime_get(), op->kt_ival2),
375 HRTIMER_MODE_ABS);
376}
377
378static void bcm_tx_timeout_tsklet(unsigned long data)
379{
380 struct bcm_op *op = (struct bcm_op *)data;
381 struct bcm_msg_head msg_head;
382
383 if (op->kt_ival1.tv64 && (op->count > 0)) {
384
385 op->count--;
386 if (!op->count && (op->flags & TX_COUNTEVT)) {
387
388
389 msg_head.opcode = TX_EXPIRED;
390 msg_head.flags = op->flags;
391 msg_head.count = op->count;
392 msg_head.ival1 = op->ival1;
393 msg_head.ival2 = op->ival2;
394 msg_head.can_id = op->can_id;
395 msg_head.nframes = 0;
396
397 bcm_send_to_user(op, &msg_head, NULL, 0);
398 }
399 bcm_can_tx(op);
400
401 } else if (op->kt_ival2.tv64)
402 bcm_can_tx(op);
403
404 bcm_tx_start_timer(op);
405}
406
407
408
409
410static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer)
411{
412 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
413
414 tasklet_schedule(&op->tsklet);
415
416 return HRTIMER_NORESTART;
417}
418
419
420
421
422static void bcm_rx_changed(struct bcm_op *op, struct canfd_frame *data)
423{
424 struct bcm_msg_head head;
425
426
427 op->frames_filtered++;
428
429
430 if (op->frames_filtered > ULONG_MAX/100)
431 op->frames_filtered = op->frames_abs = 0;
432
433
434 data->flags &= (BCM_CAN_FLAGS_MASK|RX_RECV);
435
436 head.opcode = RX_CHANGED;
437 head.flags = op->flags;
438 head.count = op->count;
439 head.ival1 = op->ival1;
440 head.ival2 = op->ival2;
441 head.can_id = op->can_id;
442 head.nframes = 1;
443
444 bcm_send_to_user(op, &head, data, 1);
445}
446
447
448
449
450
451
452static void bcm_rx_update_and_send(struct bcm_op *op,
453 struct canfd_frame *lastdata,
454 const struct canfd_frame *rxdata)
455{
456 memcpy(lastdata, rxdata, op->cfsiz);
457
458
459 lastdata->flags |= (RX_RECV|RX_THR);
460
461
462 if (!op->kt_ival2.tv64) {
463
464 bcm_rx_changed(op, lastdata);
465 return;
466 }
467
468
469 if (hrtimer_active(&op->thrtimer))
470 return;
471
472
473 if (!op->kt_lastmsg.tv64)
474 goto rx_changed_settime;
475
476
477 if (ktime_us_delta(ktime_get(), op->kt_lastmsg) <
478 ktime_to_us(op->kt_ival2)) {
479
480 hrtimer_start(&op->thrtimer,
481 ktime_add(op->kt_lastmsg, op->kt_ival2),
482 HRTIMER_MODE_ABS);
483 return;
484 }
485
486
487rx_changed_settime:
488 bcm_rx_changed(op, lastdata);
489 op->kt_lastmsg = ktime_get();
490}
491
492
493
494
495
496static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index,
497 const struct canfd_frame *rxdata)
498{
499 struct canfd_frame *cf = op->frames + op->cfsiz * index;
500 struct canfd_frame *lcf = op->last_frames + op->cfsiz * index;
501 int i;
502
503
504
505
506
507
508 if (!(lcf->flags & RX_RECV)) {
509
510 bcm_rx_update_and_send(op, lcf, rxdata);
511 return;
512 }
513
514
515 for (i = 0; i < rxdata->len; i += 8) {
516 if ((get_u64(cf, i) & get_u64(rxdata, i)) !=
517 (get_u64(cf, i) & get_u64(lcf, i))) {
518 bcm_rx_update_and_send(op, lcf, rxdata);
519 return;
520 }
521 }
522
523 if (op->flags & RX_CHECK_DLC) {
524
525 if (rxdata->len != lcf->len) {
526 bcm_rx_update_and_send(op, lcf, rxdata);
527 return;
528 }
529 }
530}
531
532
533
534
535static void bcm_rx_starttimer(struct bcm_op *op)
536{
537 if (op->flags & RX_NO_AUTOTIMER)
538 return;
539
540 if (op->kt_ival1.tv64)
541 hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL);
542}
543
544static void bcm_rx_timeout_tsklet(unsigned long data)
545{
546 struct bcm_op *op = (struct bcm_op *)data;
547 struct bcm_msg_head msg_head;
548
549
550 msg_head.opcode = RX_TIMEOUT;
551 msg_head.flags = op->flags;
552 msg_head.count = op->count;
553 msg_head.ival1 = op->ival1;
554 msg_head.ival2 = op->ival2;
555 msg_head.can_id = op->can_id;
556 msg_head.nframes = 0;
557
558 bcm_send_to_user(op, &msg_head, NULL, 0);
559}
560
561
562
563
564static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer)
565{
566 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
567
568
569 tasklet_hi_schedule(&op->tsklet);
570
571
572
573
574 if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) {
575
576 memset(op->last_frames, 0, op->nframes * op->cfsiz);
577 }
578
579 return HRTIMER_NORESTART;
580}
581
582
583
584
585static inline int bcm_rx_do_flush(struct bcm_op *op, int update,
586 unsigned int index)
587{
588 struct canfd_frame *lcf = op->last_frames + op->cfsiz * index;
589
590 if ((op->last_frames) && (lcf->flags & RX_THR)) {
591 if (update)
592 bcm_rx_changed(op, lcf);
593 return 1;
594 }
595 return 0;
596}
597
598
599
600
601
602
603
604static int bcm_rx_thr_flush(struct bcm_op *op, int update)
605{
606 int updated = 0;
607
608 if (op->nframes > 1) {
609 unsigned int i;
610
611
612 for (i = 1; i < op->nframes; i++)
613 updated += bcm_rx_do_flush(op, update, i);
614
615 } else {
616
617 updated += bcm_rx_do_flush(op, update, 0);
618 }
619
620 return updated;
621}
622
623static void bcm_rx_thr_tsklet(unsigned long data)
624{
625 struct bcm_op *op = (struct bcm_op *)data;
626
627
628 bcm_rx_thr_flush(op, 1);
629}
630
631
632
633
634
635static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer)
636{
637 struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer);
638
639 tasklet_schedule(&op->thrtsklet);
640
641 if (bcm_rx_thr_flush(op, 0)) {
642 hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2);
643 return HRTIMER_RESTART;
644 } else {
645
646 op->kt_lastmsg = ktime_set(0, 0);
647 return HRTIMER_NORESTART;
648 }
649}
650
651
652
653
654static void bcm_rx_handler(struct sk_buff *skb, void *data)
655{
656 struct bcm_op *op = (struct bcm_op *)data;
657 const struct canfd_frame *rxframe = (struct canfd_frame *)skb->data;
658 unsigned int i;
659
660 if (op->can_id != rxframe->can_id)
661 return;
662
663
664 if (skb->len != op->cfsiz)
665 return;
666
667
668 hrtimer_cancel(&op->timer);
669
670
671 op->rx_stamp = skb->tstamp;
672
673 op->rx_ifindex = skb->dev->ifindex;
674
675 op->frames_abs++;
676
677 if (op->flags & RX_RTR_FRAME) {
678
679 bcm_can_tx(op);
680 return;
681 }
682
683 if (op->flags & RX_FILTER_ID) {
684
685 bcm_rx_update_and_send(op, op->last_frames, rxframe);
686 goto rx_starttimer;
687 }
688
689 if (op->nframes == 1) {
690
691 bcm_rx_cmp_to_index(op, 0, rxframe);
692 goto rx_starttimer;
693 }
694
695 if (op->nframes > 1) {
696
697
698
699
700
701
702
703
704 for (i = 1; i < op->nframes; i++) {
705 if ((get_u64(op->frames, 0) & get_u64(rxframe, 0)) ==
706 (get_u64(op->frames, 0) &
707 get_u64(op->frames + op->cfsiz * i, 0))) {
708 bcm_rx_cmp_to_index(op, i, rxframe);
709 break;
710 }
711 }
712 }
713
714rx_starttimer:
715 bcm_rx_starttimer(op);
716}
717
718
719
720
721static struct bcm_op *bcm_find_op(struct list_head *ops,
722 struct bcm_msg_head *mh, int ifindex)
723{
724 struct bcm_op *op;
725
726 list_for_each_entry(op, ops, list) {
727 if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) &&
728 (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME))
729 return op;
730 }
731
732 return NULL;
733}
734
735static void bcm_remove_op(struct bcm_op *op)
736{
737 hrtimer_cancel(&op->timer);
738 hrtimer_cancel(&op->thrtimer);
739
740 if (op->tsklet.func)
741 tasklet_kill(&op->tsklet);
742
743 if (op->thrtsklet.func)
744 tasklet_kill(&op->thrtsklet);
745
746 if ((op->frames) && (op->frames != &op->sframe))
747 kfree(op->frames);
748
749 if ((op->last_frames) && (op->last_frames != &op->last_sframe))
750 kfree(op->last_frames);
751
752 kfree(op);
753}
754
755static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
756{
757 if (op->rx_reg_dev == dev) {
758 can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
759 bcm_rx_handler, op);
760
761
762 op->rx_reg_dev = NULL;
763 } else
764 printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device "
765 "mismatch %p %p\n", op->rx_reg_dev, dev);
766}
767
768
769
770
771static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh,
772 int ifindex)
773{
774 struct bcm_op *op, *n;
775
776 list_for_each_entry_safe(op, n, ops, list) {
777 if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) &&
778 (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) {
779
780
781
782
783
784
785 if (op->ifindex) {
786
787
788
789
790
791 if (op->rx_reg_dev) {
792 struct net_device *dev;
793
794 dev = dev_get_by_index(&init_net,
795 op->ifindex);
796 if (dev) {
797 bcm_rx_unreg(dev, op);
798 dev_put(dev);
799 }
800 }
801 } else
802 can_rx_unregister(NULL, op->can_id,
803 REGMASK(op->can_id),
804 bcm_rx_handler, op);
805
806 list_del(&op->list);
807 bcm_remove_op(op);
808 return 1;
809 }
810 }
811
812 return 0;
813}
814
815
816
817
818static int bcm_delete_tx_op(struct list_head *ops, struct bcm_msg_head *mh,
819 int ifindex)
820{
821 struct bcm_op *op, *n;
822
823 list_for_each_entry_safe(op, n, ops, list) {
824 if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) &&
825 (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) {
826 list_del(&op->list);
827 bcm_remove_op(op);
828 return 1;
829 }
830 }
831
832 return 0;
833}
834
835
836
837
838static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
839 int ifindex)
840{
841 struct bcm_op *op = bcm_find_op(ops, msg_head, ifindex);
842
843 if (!op)
844 return -EINVAL;
845
846
847 msg_head->flags = op->flags;
848 msg_head->count = op->count;
849 msg_head->ival1 = op->ival1;
850 msg_head->ival2 = op->ival2;
851 msg_head->nframes = op->nframes;
852
853 bcm_send_to_user(op, msg_head, op->frames, 0);
854
855 return MHSIZ;
856}
857
858
859
860
861static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
862 int ifindex, struct sock *sk)
863{
864 struct bcm_sock *bo = bcm_sk(sk);
865 struct bcm_op *op;
866 struct canfd_frame *cf;
867 unsigned int i;
868 int err;
869
870
871 if (!ifindex)
872 return -ENODEV;
873
874
875 if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
876 return -EINVAL;
877
878
879 op = bcm_find_op(&bo->tx_ops, msg_head, ifindex);
880 if (op) {
881
882
883
884
885
886
887
888 if (msg_head->nframes > op->nframes)
889 return -E2BIG;
890
891
892 for (i = 0; i < msg_head->nframes; i++) {
893
894 cf = op->frames + op->cfsiz * i;
895 err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz);
896
897 if (op->flags & CAN_FD_FRAME) {
898 if (cf->len > 64)
899 err = -EINVAL;
900 } else {
901 if (cf->len > 8)
902 err = -EINVAL;
903 }
904
905 if (err < 0)
906 return err;
907
908 if (msg_head->flags & TX_CP_CAN_ID) {
909
910 cf->can_id = msg_head->can_id;
911 }
912 }
913 op->flags = msg_head->flags;
914
915 } else {
916
917
918 op = kzalloc(OPSIZ, GFP_KERNEL);
919 if (!op)
920 return -ENOMEM;
921
922 op->can_id = msg_head->can_id;
923 op->cfsiz = CFSIZ(msg_head->flags);
924 op->flags = msg_head->flags;
925
926
927 if (msg_head->nframes > 1) {
928 op->frames = kmalloc(msg_head->nframes * op->cfsiz,
929 GFP_KERNEL);
930 if (!op->frames) {
931 kfree(op);
932 return -ENOMEM;
933 }
934 } else
935 op->frames = &op->sframe;
936
937 for (i = 0; i < msg_head->nframes; i++) {
938
939 cf = op->frames + op->cfsiz * i;
940 err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz);
941
942 if (op->flags & CAN_FD_FRAME) {
943 if (cf->len > 64)
944 err = -EINVAL;
945 } else {
946 if (cf->len > 8)
947 err = -EINVAL;
948 }
949
950 if (err < 0) {
951 if (op->frames != &op->sframe)
952 kfree(op->frames);
953 kfree(op);
954 return err;
955 }
956
957 if (msg_head->flags & TX_CP_CAN_ID) {
958
959 cf->can_id = msg_head->can_id;
960 }
961 }
962
963
964 op->last_frames = NULL;
965
966
967 op->sk = sk;
968 op->ifindex = ifindex;
969
970
971 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
972 op->timer.function = bcm_tx_timeout_handler;
973
974
975 tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
976 (unsigned long) op);
977
978
979 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
980
981
982 list_add(&op->list, &bo->tx_ops);
983
984 }
985
986 if (op->nframes != msg_head->nframes) {
987 op->nframes = msg_head->nframes;
988
989 op->currframe = 0;
990 }
991
992
993
994 if (op->flags & TX_RESET_MULTI_IDX) {
995
996 op->currframe = 0;
997 }
998
999 if (op->flags & SETTIMER) {
1000
1001 op->count = msg_head->count;
1002 op->ival1 = msg_head->ival1;
1003 op->ival2 = msg_head->ival2;
1004 op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1);
1005 op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2);
1006
1007
1008 if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64)
1009 hrtimer_cancel(&op->timer);
1010 }
1011
1012 if (op->flags & STARTTIMER) {
1013 hrtimer_cancel(&op->timer);
1014
1015 op->flags |= TX_ANNOUNCE;
1016 }
1017
1018 if (op->flags & TX_ANNOUNCE) {
1019 bcm_can_tx(op);
1020 if (op->count)
1021 op->count--;
1022 }
1023
1024 if (op->flags & STARTTIMER)
1025 bcm_tx_start_timer(op);
1026
1027 return msg_head->nframes * op->cfsiz + MHSIZ;
1028}
1029
1030
1031
1032
1033static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
1034 int ifindex, struct sock *sk)
1035{
1036 struct bcm_sock *bo = bcm_sk(sk);
1037 struct bcm_op *op;
1038 int do_rx_register;
1039 int err = 0;
1040
1041 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
1042
1043 msg_head->flags |= RX_FILTER_ID;
1044
1045 msg_head->nframes = 0;
1046 }
1047
1048
1049 if (msg_head->nframes > MAX_NFRAMES + 1)
1050 return -EINVAL;
1051
1052 if ((msg_head->flags & RX_RTR_FRAME) &&
1053 ((msg_head->nframes != 1) ||
1054 (!(msg_head->can_id & CAN_RTR_FLAG))))
1055 return -EINVAL;
1056
1057
1058 op = bcm_find_op(&bo->rx_ops, msg_head, ifindex);
1059 if (op) {
1060
1061
1062
1063
1064
1065
1066
1067 if (msg_head->nframes > op->nframes)
1068 return -E2BIG;
1069
1070 if (msg_head->nframes) {
1071
1072 err = memcpy_from_msg(op->frames, msg,
1073 msg_head->nframes * op->cfsiz);
1074 if (err < 0)
1075 return err;
1076
1077
1078 memset(op->last_frames, 0, msg_head->nframes * op->cfsiz);
1079 }
1080
1081 op->nframes = msg_head->nframes;
1082 op->flags = msg_head->flags;
1083
1084
1085 do_rx_register = 0;
1086
1087 } else {
1088
1089 op = kzalloc(OPSIZ, GFP_KERNEL);
1090 if (!op)
1091 return -ENOMEM;
1092
1093 op->can_id = msg_head->can_id;
1094 op->nframes = msg_head->nframes;
1095 op->cfsiz = CFSIZ(msg_head->flags);
1096 op->flags = msg_head->flags;
1097
1098 if (msg_head->nframes > 1) {
1099
1100 op->frames = kmalloc(msg_head->nframes * op->cfsiz,
1101 GFP_KERNEL);
1102 if (!op->frames) {
1103 kfree(op);
1104 return -ENOMEM;
1105 }
1106
1107
1108 op->last_frames = kzalloc(msg_head->nframes * op->cfsiz,
1109 GFP_KERNEL);
1110 if (!op->last_frames) {
1111 kfree(op->frames);
1112 kfree(op);
1113 return -ENOMEM;
1114 }
1115
1116 } else {
1117 op->frames = &op->sframe;
1118 op->last_frames = &op->last_sframe;
1119 }
1120
1121 if (msg_head->nframes) {
1122 err = memcpy_from_msg(op->frames, msg,
1123 msg_head->nframes * op->cfsiz);
1124 if (err < 0) {
1125 if (op->frames != &op->sframe)
1126 kfree(op->frames);
1127 if (op->last_frames != &op->last_sframe)
1128 kfree(op->last_frames);
1129 kfree(op);
1130 return err;
1131 }
1132 }
1133
1134
1135 op->sk = sk;
1136 op->ifindex = ifindex;
1137
1138
1139 op->rx_ifindex = ifindex;
1140
1141
1142 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1143 op->timer.function = bcm_rx_timeout_handler;
1144
1145
1146 tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
1147 (unsigned long) op);
1148
1149 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1150 op->thrtimer.function = bcm_rx_thr_handler;
1151
1152
1153 tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
1154 (unsigned long) op);
1155
1156
1157 list_add(&op->list, &bo->rx_ops);
1158
1159
1160 do_rx_register = 1;
1161
1162 }
1163
1164
1165
1166 if (op->flags & RX_RTR_FRAME) {
1167 struct canfd_frame *frame0 = op->frames;
1168
1169
1170 hrtimer_cancel(&op->thrtimer);
1171 hrtimer_cancel(&op->timer);
1172
1173
1174
1175
1176
1177
1178 if ((op->flags & TX_CP_CAN_ID) ||
1179 (frame0->can_id == op->can_id))
1180 frame0->can_id = op->can_id & ~CAN_RTR_FLAG;
1181
1182 } else {
1183 if (op->flags & SETTIMER) {
1184
1185
1186 op->ival1 = msg_head->ival1;
1187 op->ival2 = msg_head->ival2;
1188 op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1);
1189 op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2);
1190
1191
1192 if (!op->kt_ival1.tv64)
1193 hrtimer_cancel(&op->timer);
1194
1195
1196
1197
1198
1199 op->kt_lastmsg = ktime_set(0, 0);
1200 hrtimer_cancel(&op->thrtimer);
1201 bcm_rx_thr_flush(op, 1);
1202 }
1203
1204 if ((op->flags & STARTTIMER) && op->kt_ival1.tv64)
1205 hrtimer_start(&op->timer, op->kt_ival1,
1206 HRTIMER_MODE_REL);
1207 }
1208
1209
1210 if (do_rx_register) {
1211 if (ifindex) {
1212 struct net_device *dev;
1213
1214 dev = dev_get_by_index(&init_net, ifindex);
1215 if (dev) {
1216 err = can_rx_register(dev, op->can_id,
1217 REGMASK(op->can_id),
1218 bcm_rx_handler, op,
1219 "bcm");
1220
1221 op->rx_reg_dev = dev;
1222 dev_put(dev);
1223 }
1224
1225 } else
1226 err = can_rx_register(NULL, op->can_id,
1227 REGMASK(op->can_id),
1228 bcm_rx_handler, op, "bcm");
1229 if (err) {
1230
1231 list_del(&op->list);
1232 bcm_remove_op(op);
1233 return err;
1234 }
1235 }
1236
1237 return msg_head->nframes * op->cfsiz + MHSIZ;
1238}
1239
1240
1241
1242
1243static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk,
1244 int cfsiz)
1245{
1246 struct sk_buff *skb;
1247 struct net_device *dev;
1248 int err;
1249
1250
1251 if (!ifindex)
1252 return -ENODEV;
1253
1254 skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL);
1255 if (!skb)
1256 return -ENOMEM;
1257
1258 can_skb_reserve(skb);
1259
1260 err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz);
1261 if (err < 0) {
1262 kfree_skb(skb);
1263 return err;
1264 }
1265
1266 dev = dev_get_by_index(&init_net, ifindex);
1267 if (!dev) {
1268 kfree_skb(skb);
1269 return -ENODEV;
1270 }
1271
1272 can_skb_prv(skb)->ifindex = dev->ifindex;
1273 can_skb_prv(skb)->skbcnt = 0;
1274 skb->dev = dev;
1275 can_skb_set_owner(skb, sk);
1276 err = can_send(skb, 1);
1277 dev_put(dev);
1278
1279 if (err)
1280 return err;
1281
1282 return cfsiz + MHSIZ;
1283}
1284
1285
1286
1287
1288static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1289{
1290 struct sock *sk = sock->sk;
1291 struct bcm_sock *bo = bcm_sk(sk);
1292 int ifindex = bo->ifindex;
1293 struct bcm_msg_head msg_head;
1294 int cfsiz;
1295 int ret;
1296
1297 if (!bo->bound)
1298 return -ENOTCONN;
1299
1300
1301 if (size < MHSIZ)
1302 return -EINVAL;
1303
1304
1305 ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ);
1306 if (ret < 0)
1307 return ret;
1308
1309 cfsiz = CFSIZ(msg_head.flags);
1310 if ((size - MHSIZ) % cfsiz)
1311 return -EINVAL;
1312
1313
1314
1315 if (!ifindex && msg->msg_name) {
1316
1317 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
1318
1319 if (msg->msg_namelen < sizeof(*addr))
1320 return -EINVAL;
1321
1322 if (addr->can_family != AF_CAN)
1323 return -EINVAL;
1324
1325
1326 ifindex = addr->can_ifindex;
1327
1328 if (ifindex) {
1329 struct net_device *dev;
1330
1331 dev = dev_get_by_index(&init_net, ifindex);
1332 if (!dev)
1333 return -ENODEV;
1334
1335 if (dev->type != ARPHRD_CAN) {
1336 dev_put(dev);
1337 return -ENODEV;
1338 }
1339
1340 dev_put(dev);
1341 }
1342 }
1343
1344 lock_sock(sk);
1345
1346 switch (msg_head.opcode) {
1347
1348 case TX_SETUP:
1349 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1350 break;
1351
1352 case RX_SETUP:
1353 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1354 break;
1355
1356 case TX_DELETE:
1357 if (bcm_delete_tx_op(&bo->tx_ops, &msg_head, ifindex))
1358 ret = MHSIZ;
1359 else
1360 ret = -EINVAL;
1361 break;
1362
1363 case RX_DELETE:
1364 if (bcm_delete_rx_op(&bo->rx_ops, &msg_head, ifindex))
1365 ret = MHSIZ;
1366 else
1367 ret = -EINVAL;
1368 break;
1369
1370 case TX_READ:
1371
1372 msg_head.opcode = TX_STATUS;
1373 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1374 break;
1375
1376 case RX_READ:
1377
1378 msg_head.opcode = RX_STATUS;
1379 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1380 break;
1381
1382 case TX_SEND:
1383
1384 if ((msg_head.nframes != 1) || (size != cfsiz + MHSIZ))
1385 ret = -EINVAL;
1386 else
1387 ret = bcm_tx_send(msg, ifindex, sk, cfsiz);
1388 break;
1389
1390 default:
1391 ret = -EINVAL;
1392 break;
1393 }
1394
1395 release_sock(sk);
1396
1397 return ret;
1398}
1399
1400
1401
1402
1403static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
1404 void *ptr)
1405{
1406 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1407 struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
1408 struct sock *sk = &bo->sk;
1409 struct bcm_op *op;
1410 int notify_enodev = 0;
1411
1412 if (!net_eq(dev_net(dev), &init_net))
1413 return NOTIFY_DONE;
1414
1415 if (dev->type != ARPHRD_CAN)
1416 return NOTIFY_DONE;
1417
1418 switch (msg) {
1419
1420 case NETDEV_UNREGISTER:
1421 lock_sock(sk);
1422
1423
1424 list_for_each_entry(op, &bo->rx_ops, list)
1425 if (op->rx_reg_dev == dev)
1426 bcm_rx_unreg(dev, op);
1427
1428
1429 if (bo->bound && bo->ifindex == dev->ifindex) {
1430 bo->bound = 0;
1431 bo->ifindex = 0;
1432 notify_enodev = 1;
1433 }
1434
1435 release_sock(sk);
1436
1437 if (notify_enodev) {
1438 sk->sk_err = ENODEV;
1439 if (!sock_flag(sk, SOCK_DEAD))
1440 sk->sk_error_report(sk);
1441 }
1442 break;
1443
1444 case NETDEV_DOWN:
1445 if (bo->bound && bo->ifindex == dev->ifindex) {
1446 sk->sk_err = ENETDOWN;
1447 if (!sock_flag(sk, SOCK_DEAD))
1448 sk->sk_error_report(sk);
1449 }
1450 }
1451
1452 return NOTIFY_DONE;
1453}
1454
1455
1456
1457
1458static int bcm_init(struct sock *sk)
1459{
1460 struct bcm_sock *bo = bcm_sk(sk);
1461
1462 bo->bound = 0;
1463 bo->ifindex = 0;
1464 bo->dropped_usr_msgs = 0;
1465 bo->bcm_proc_read = NULL;
1466
1467 INIT_LIST_HEAD(&bo->tx_ops);
1468 INIT_LIST_HEAD(&bo->rx_ops);
1469
1470
1471 bo->notifier.notifier_call = bcm_notifier;
1472
1473 register_netdevice_notifier(&bo->notifier);
1474
1475 return 0;
1476}
1477
1478
1479
1480
1481static int bcm_release(struct socket *sock)
1482{
1483 struct sock *sk = sock->sk;
1484 struct bcm_sock *bo;
1485 struct bcm_op *op, *next;
1486
1487 if (sk == NULL)
1488 return 0;
1489
1490 bo = bcm_sk(sk);
1491
1492
1493
1494 unregister_netdevice_notifier(&bo->notifier);
1495
1496 lock_sock(sk);
1497
1498 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1499 bcm_remove_op(op);
1500
1501 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1502
1503
1504
1505
1506 if (op->ifindex) {
1507
1508
1509
1510
1511
1512 if (op->rx_reg_dev) {
1513 struct net_device *dev;
1514
1515 dev = dev_get_by_index(&init_net, op->ifindex);
1516 if (dev) {
1517 bcm_rx_unreg(dev, op);
1518 dev_put(dev);
1519 }
1520 }
1521 } else
1522 can_rx_unregister(NULL, op->can_id,
1523 REGMASK(op->can_id),
1524 bcm_rx_handler, op);
1525
1526 bcm_remove_op(op);
1527 }
1528
1529
1530 if (proc_dir && bo->bcm_proc_read)
1531 remove_proc_entry(bo->procname, proc_dir);
1532
1533
1534 if (bo->bound) {
1535 bo->bound = 0;
1536 bo->ifindex = 0;
1537 }
1538
1539 sock_orphan(sk);
1540 sock->sk = NULL;
1541
1542 release_sock(sk);
1543 sock_put(sk);
1544
1545 return 0;
1546}
1547
1548static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1549 int flags)
1550{
1551 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1552 struct sock *sk = sock->sk;
1553 struct bcm_sock *bo = bcm_sk(sk);
1554 int ret = 0;
1555
1556 if (len < sizeof(*addr))
1557 return -EINVAL;
1558
1559 lock_sock(sk);
1560
1561 if (bo->bound) {
1562 ret = -EISCONN;
1563 goto fail;
1564 }
1565
1566
1567 if (addr->can_ifindex) {
1568 struct net_device *dev;
1569
1570 dev = dev_get_by_index(&init_net, addr->can_ifindex);
1571 if (!dev) {
1572 ret = -ENODEV;
1573 goto fail;
1574 }
1575 if (dev->type != ARPHRD_CAN) {
1576 dev_put(dev);
1577 ret = -ENODEV;
1578 goto fail;
1579 }
1580
1581 bo->ifindex = dev->ifindex;
1582 dev_put(dev);
1583
1584 } else {
1585
1586 bo->ifindex = 0;
1587 }
1588
1589 if (proc_dir) {
1590
1591 sprintf(bo->procname, "%lu", sock_i_ino(sk));
1592 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1593 proc_dir,
1594 &bcm_proc_fops, sk);
1595 if (!bo->bcm_proc_read) {
1596 ret = -ENOMEM;
1597 goto fail;
1598 }
1599 }
1600
1601 bo->bound = 1;
1602
1603fail:
1604 release_sock(sk);
1605
1606 return ret;
1607}
1608
1609static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1610 int flags)
1611{
1612 struct sock *sk = sock->sk;
1613 struct sk_buff *skb;
1614 int error = 0;
1615 int noblock;
1616 int err;
1617
1618 noblock = flags & MSG_DONTWAIT;
1619 flags &= ~MSG_DONTWAIT;
1620 skb = skb_recv_datagram(sk, flags, noblock, &error);
1621 if (!skb)
1622 return error;
1623
1624 if (skb->len < size)
1625 size = skb->len;
1626
1627 err = memcpy_to_msg(msg, skb->data, size);
1628 if (err < 0) {
1629 skb_free_datagram(sk, skb);
1630 return err;
1631 }
1632
1633 sock_recv_ts_and_drops(msg, sk, skb);
1634
1635 if (msg->msg_name) {
1636 __sockaddr_check_size(sizeof(struct sockaddr_can));
1637 msg->msg_namelen = sizeof(struct sockaddr_can);
1638 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1639 }
1640
1641 skb_free_datagram(sk, skb);
1642
1643 return size;
1644}
1645
1646static const struct proto_ops bcm_ops = {
1647 .family = PF_CAN,
1648 .release = bcm_release,
1649 .bind = sock_no_bind,
1650 .connect = bcm_connect,
1651 .socketpair = sock_no_socketpair,
1652 .accept = sock_no_accept,
1653 .getname = sock_no_getname,
1654 .poll = datagram_poll,
1655 .ioctl = can_ioctl,
1656 .listen = sock_no_listen,
1657 .shutdown = sock_no_shutdown,
1658 .setsockopt = sock_no_setsockopt,
1659 .getsockopt = sock_no_getsockopt,
1660 .sendmsg = bcm_sendmsg,
1661 .recvmsg = bcm_recvmsg,
1662 .mmap = sock_no_mmap,
1663 .sendpage = sock_no_sendpage,
1664};
1665
1666static struct proto bcm_proto __read_mostly = {
1667 .name = "CAN_BCM",
1668 .owner = THIS_MODULE,
1669 .obj_size = sizeof(struct bcm_sock),
1670 .init = bcm_init,
1671};
1672
1673static const struct can_proto bcm_can_proto = {
1674 .type = SOCK_DGRAM,
1675 .protocol = CAN_BCM,
1676 .ops = &bcm_ops,
1677 .prot = &bcm_proto,
1678};
1679
1680static int __init bcm_module_init(void)
1681{
1682 int err;
1683
1684 pr_info("can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n");
1685
1686 err = can_proto_register(&bcm_can_proto);
1687 if (err < 0) {
1688 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1689 return err;
1690 }
1691
1692
1693 proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
1694 return 0;
1695}
1696
1697static void __exit bcm_module_exit(void)
1698{
1699 can_proto_unregister(&bcm_can_proto);
1700
1701 if (proc_dir)
1702 remove_proc_entry("can-bcm", init_net.proc_net);
1703}
1704
1705module_init(bcm_module_init);
1706module_exit(bcm_module_exit);
1707