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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 "20170425"
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
121struct bcm_sock {
122 struct sock sk;
123 int bound;
124 int ifindex;
125 struct notifier_block notifier;
126 struct list_head rx_ops;
127 struct list_head tx_ops;
128 unsigned long dropped_usr_msgs;
129 struct proc_dir_entry *bcm_proc_read;
130 char procname [32];
131};
132
133static inline struct bcm_sock *bcm_sk(const struct sock *sk)
134{
135 return (struct bcm_sock *)sk;
136}
137
138static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv)
139{
140 return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC);
141}
142
143#define CFSIZ(flags) ((flags & CAN_FD_FRAME) ? CANFD_MTU : CAN_MTU)
144#define OPSIZ sizeof(struct bcm_op)
145#define MHSIZ sizeof(struct bcm_msg_head)
146
147
148
149
150#if IS_ENABLED(CONFIG_PROC_FS)
151static char *bcm_proc_getifname(struct net *net, char *result, int ifindex)
152{
153 struct net_device *dev;
154
155 if (!ifindex)
156 return "any";
157
158 rcu_read_lock();
159 dev = dev_get_by_index_rcu(net, ifindex);
160 if (dev)
161 strcpy(result, dev->name);
162 else
163 strcpy(result, "???");
164 rcu_read_unlock();
165
166 return result;
167}
168
169static int bcm_proc_show(struct seq_file *m, void *v)
170{
171 char ifname[IFNAMSIZ];
172 struct net *net = m->private;
173 struct sock *sk = (struct sock *)PDE_DATA(m->file->f_inode);
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(net, 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(net, 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)
203 seq_printf(m, "timeo=%lld ",
204 (long long)ktime_to_us(op->kt_ival1));
205
206 if (op->kt_ival2)
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(net, 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)
230 seq_printf(m, "t1=%lld ",
231 (long long)ktime_to_us(op->kt_ival1));
232
233 if (op->kt_ival2)
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_net(inode, file, bcm_proc_show);
246}
247
248static const struct file_operations bcm_proc_fops = {
249 .open = bcm_proc_open,
250 .read = seq_read,
251 .llseek = seq_lseek,
252 .release = single_release,
253};
254#endif
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(sock_net(op->sk), 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 skb_put_data(skb, 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 skb_put_data(skb, head, sizeof(*head));
321
322 if (head->nframes) {
323
324 firstframe = (struct canfd_frame *)skb_tail_pointer(skb);
325
326 skb_put_data(skb, 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 && 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)
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 && (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)
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) {
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)
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)
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 = 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 if (op->tsklet.func) {
738 while (test_bit(TASKLET_STATE_SCHED, &op->tsklet.state) ||
739 test_bit(TASKLET_STATE_RUN, &op->tsklet.state) ||
740 hrtimer_active(&op->timer)) {
741 hrtimer_cancel(&op->timer);
742 tasklet_kill(&op->tsklet);
743 }
744 }
745
746 if (op->thrtsklet.func) {
747 while (test_bit(TASKLET_STATE_SCHED, &op->thrtsklet.state) ||
748 test_bit(TASKLET_STATE_RUN, &op->thrtsklet.state) ||
749 hrtimer_active(&op->thrtimer)) {
750 hrtimer_cancel(&op->thrtimer);
751 tasklet_kill(&op->thrtsklet);
752 }
753 }
754
755 if ((op->frames) && (op->frames != &op->sframe))
756 kfree(op->frames);
757
758 if ((op->last_frames) && (op->last_frames != &op->last_sframe))
759 kfree(op->last_frames);
760
761 kfree(op);
762}
763
764static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
765{
766 if (op->rx_reg_dev == dev) {
767 can_rx_unregister(dev_net(dev), dev, op->can_id,
768 REGMASK(op->can_id), bcm_rx_handler, op);
769
770
771 op->rx_reg_dev = NULL;
772 } else
773 printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device "
774 "mismatch %p %p\n", op->rx_reg_dev, dev);
775}
776
777
778
779
780static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh,
781 int ifindex)
782{
783 struct bcm_op *op, *n;
784
785 list_for_each_entry_safe(op, n, ops, list) {
786 if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) &&
787 (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) {
788
789
790
791
792
793
794 if (op->ifindex) {
795
796
797
798
799
800 if (op->rx_reg_dev) {
801 struct net_device *dev;
802
803 dev = dev_get_by_index(sock_net(op->sk),
804 op->ifindex);
805 if (dev) {
806 bcm_rx_unreg(dev, op);
807 dev_put(dev);
808 }
809 }
810 } else
811 can_rx_unregister(sock_net(op->sk), NULL,
812 op->can_id,
813 REGMASK(op->can_id),
814 bcm_rx_handler, op);
815
816 list_del(&op->list);
817 bcm_remove_op(op);
818 return 1;
819 }
820 }
821
822 return 0;
823}
824
825
826
827
828static int bcm_delete_tx_op(struct list_head *ops, struct bcm_msg_head *mh,
829 int ifindex)
830{
831 struct bcm_op *op, *n;
832
833 list_for_each_entry_safe(op, n, ops, list) {
834 if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) &&
835 (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) {
836 list_del(&op->list);
837 bcm_remove_op(op);
838 return 1;
839 }
840 }
841
842 return 0;
843}
844
845
846
847
848static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
849 int ifindex)
850{
851 struct bcm_op *op = bcm_find_op(ops, msg_head, ifindex);
852
853 if (!op)
854 return -EINVAL;
855
856
857 msg_head->flags = op->flags;
858 msg_head->count = op->count;
859 msg_head->ival1 = op->ival1;
860 msg_head->ival2 = op->ival2;
861 msg_head->nframes = op->nframes;
862
863 bcm_send_to_user(op, msg_head, op->frames, 0);
864
865 return MHSIZ;
866}
867
868
869
870
871static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
872 int ifindex, struct sock *sk)
873{
874 struct bcm_sock *bo = bcm_sk(sk);
875 struct bcm_op *op;
876 struct canfd_frame *cf;
877 unsigned int i;
878 int err;
879
880
881 if (!ifindex)
882 return -ENODEV;
883
884
885 if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
886 return -EINVAL;
887
888
889 op = bcm_find_op(&bo->tx_ops, msg_head, ifindex);
890 if (op) {
891
892
893
894
895
896
897
898 if (msg_head->nframes > op->nframes)
899 return -E2BIG;
900
901
902 for (i = 0; i < msg_head->nframes; i++) {
903
904 cf = op->frames + op->cfsiz * i;
905 err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz);
906
907 if (op->flags & CAN_FD_FRAME) {
908 if (cf->len > 64)
909 err = -EINVAL;
910 } else {
911 if (cf->len > 8)
912 err = -EINVAL;
913 }
914
915 if (err < 0)
916 return err;
917
918 if (msg_head->flags & TX_CP_CAN_ID) {
919
920 cf->can_id = msg_head->can_id;
921 }
922 }
923 op->flags = msg_head->flags;
924
925 } else {
926
927
928 op = kzalloc(OPSIZ, GFP_KERNEL);
929 if (!op)
930 return -ENOMEM;
931
932 op->can_id = msg_head->can_id;
933 op->cfsiz = CFSIZ(msg_head->flags);
934 op->flags = msg_head->flags;
935
936
937 if (msg_head->nframes > 1) {
938 op->frames = kmalloc(msg_head->nframes * op->cfsiz,
939 GFP_KERNEL);
940 if (!op->frames) {
941 kfree(op);
942 return -ENOMEM;
943 }
944 } else
945 op->frames = &op->sframe;
946
947 for (i = 0; i < msg_head->nframes; i++) {
948
949 cf = op->frames + op->cfsiz * i;
950 err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz);
951
952 if (op->flags & CAN_FD_FRAME) {
953 if (cf->len > 64)
954 err = -EINVAL;
955 } else {
956 if (cf->len > 8)
957 err = -EINVAL;
958 }
959
960 if (err < 0) {
961 if (op->frames != &op->sframe)
962 kfree(op->frames);
963 kfree(op);
964 return err;
965 }
966
967 if (msg_head->flags & TX_CP_CAN_ID) {
968
969 cf->can_id = msg_head->can_id;
970 }
971 }
972
973
974 op->last_frames = NULL;
975
976
977 op->sk = sk;
978 op->ifindex = ifindex;
979
980
981 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
982 op->timer.function = bcm_tx_timeout_handler;
983
984
985 tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
986 (unsigned long) op);
987
988
989 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
990
991
992 list_add(&op->list, &bo->tx_ops);
993
994 }
995
996 if (op->nframes != msg_head->nframes) {
997 op->nframes = msg_head->nframes;
998
999 op->currframe = 0;
1000 }
1001
1002
1003
1004 if (op->flags & TX_RESET_MULTI_IDX) {
1005
1006 op->currframe = 0;
1007 }
1008
1009 if (op->flags & SETTIMER) {
1010
1011 op->count = msg_head->count;
1012 op->ival1 = msg_head->ival1;
1013 op->ival2 = msg_head->ival2;
1014 op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1);
1015 op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2);
1016
1017
1018 if (!op->kt_ival1 && !op->kt_ival2)
1019 hrtimer_cancel(&op->timer);
1020 }
1021
1022 if (op->flags & STARTTIMER) {
1023 hrtimer_cancel(&op->timer);
1024
1025 op->flags |= TX_ANNOUNCE;
1026 }
1027
1028 if (op->flags & TX_ANNOUNCE) {
1029 bcm_can_tx(op);
1030 if (op->count)
1031 op->count--;
1032 }
1033
1034 if (op->flags & STARTTIMER)
1035 bcm_tx_start_timer(op);
1036
1037 return msg_head->nframes * op->cfsiz + MHSIZ;
1038}
1039
1040
1041
1042
1043static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
1044 int ifindex, struct sock *sk)
1045{
1046 struct bcm_sock *bo = bcm_sk(sk);
1047 struct bcm_op *op;
1048 int do_rx_register;
1049 int err = 0;
1050
1051 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
1052
1053 msg_head->flags |= RX_FILTER_ID;
1054
1055 msg_head->nframes = 0;
1056 }
1057
1058
1059 if (msg_head->nframes > MAX_NFRAMES + 1)
1060 return -EINVAL;
1061
1062 if ((msg_head->flags & RX_RTR_FRAME) &&
1063 ((msg_head->nframes != 1) ||
1064 (!(msg_head->can_id & CAN_RTR_FLAG))))
1065 return -EINVAL;
1066
1067
1068 op = bcm_find_op(&bo->rx_ops, msg_head, ifindex);
1069 if (op) {
1070
1071
1072
1073
1074
1075
1076
1077 if (msg_head->nframes > op->nframes)
1078 return -E2BIG;
1079
1080 if (msg_head->nframes) {
1081
1082 err = memcpy_from_msg(op->frames, msg,
1083 msg_head->nframes * op->cfsiz);
1084 if (err < 0)
1085 return err;
1086
1087
1088 memset(op->last_frames, 0, msg_head->nframes * op->cfsiz);
1089 }
1090
1091 op->nframes = msg_head->nframes;
1092 op->flags = msg_head->flags;
1093
1094
1095 do_rx_register = 0;
1096
1097 } else {
1098
1099 op = kzalloc(OPSIZ, GFP_KERNEL);
1100 if (!op)
1101 return -ENOMEM;
1102
1103 op->can_id = msg_head->can_id;
1104 op->nframes = msg_head->nframes;
1105 op->cfsiz = CFSIZ(msg_head->flags);
1106 op->flags = msg_head->flags;
1107
1108 if (msg_head->nframes > 1) {
1109
1110 op->frames = kmalloc(msg_head->nframes * op->cfsiz,
1111 GFP_KERNEL);
1112 if (!op->frames) {
1113 kfree(op);
1114 return -ENOMEM;
1115 }
1116
1117
1118 op->last_frames = kzalloc(msg_head->nframes * op->cfsiz,
1119 GFP_KERNEL);
1120 if (!op->last_frames) {
1121 kfree(op->frames);
1122 kfree(op);
1123 return -ENOMEM;
1124 }
1125
1126 } else {
1127 op->frames = &op->sframe;
1128 op->last_frames = &op->last_sframe;
1129 }
1130
1131 if (msg_head->nframes) {
1132 err = memcpy_from_msg(op->frames, msg,
1133 msg_head->nframes * op->cfsiz);
1134 if (err < 0) {
1135 if (op->frames != &op->sframe)
1136 kfree(op->frames);
1137 if (op->last_frames != &op->last_sframe)
1138 kfree(op->last_frames);
1139 kfree(op);
1140 return err;
1141 }
1142 }
1143
1144
1145 op->sk = sk;
1146 op->ifindex = ifindex;
1147
1148
1149 op->rx_ifindex = ifindex;
1150
1151
1152 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1153 op->timer.function = bcm_rx_timeout_handler;
1154
1155
1156 tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
1157 (unsigned long) op);
1158
1159 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1160 op->thrtimer.function = bcm_rx_thr_handler;
1161
1162
1163 tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
1164 (unsigned long) op);
1165
1166
1167 list_add(&op->list, &bo->rx_ops);
1168
1169
1170 do_rx_register = 1;
1171
1172 }
1173
1174
1175
1176 if (op->flags & RX_RTR_FRAME) {
1177 struct canfd_frame *frame0 = op->frames;
1178
1179
1180 hrtimer_cancel(&op->thrtimer);
1181 hrtimer_cancel(&op->timer);
1182
1183
1184
1185
1186
1187
1188 if ((op->flags & TX_CP_CAN_ID) ||
1189 (frame0->can_id == op->can_id))
1190 frame0->can_id = op->can_id & ~CAN_RTR_FLAG;
1191
1192 } else {
1193 if (op->flags & SETTIMER) {
1194
1195
1196 op->ival1 = msg_head->ival1;
1197 op->ival2 = msg_head->ival2;
1198 op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1);
1199 op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2);
1200
1201
1202 if (!op->kt_ival1)
1203 hrtimer_cancel(&op->timer);
1204
1205
1206
1207
1208
1209 op->kt_lastmsg = 0;
1210 hrtimer_cancel(&op->thrtimer);
1211 bcm_rx_thr_flush(op, 1);
1212 }
1213
1214 if ((op->flags & STARTTIMER) && op->kt_ival1)
1215 hrtimer_start(&op->timer, op->kt_ival1,
1216 HRTIMER_MODE_REL);
1217 }
1218
1219
1220 if (do_rx_register) {
1221 if (ifindex) {
1222 struct net_device *dev;
1223
1224 dev = dev_get_by_index(sock_net(sk), ifindex);
1225 if (dev) {
1226 err = can_rx_register(sock_net(sk), dev,
1227 op->can_id,
1228 REGMASK(op->can_id),
1229 bcm_rx_handler, op,
1230 "bcm", sk);
1231
1232 op->rx_reg_dev = dev;
1233 dev_put(dev);
1234 }
1235
1236 } else
1237 err = can_rx_register(sock_net(sk), NULL, op->can_id,
1238 REGMASK(op->can_id),
1239 bcm_rx_handler, op, "bcm", sk);
1240 if (err) {
1241
1242 list_del(&op->list);
1243 bcm_remove_op(op);
1244 return err;
1245 }
1246 }
1247
1248 return msg_head->nframes * op->cfsiz + MHSIZ;
1249}
1250
1251
1252
1253
1254static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk,
1255 int cfsiz)
1256{
1257 struct sk_buff *skb;
1258 struct net_device *dev;
1259 int err;
1260
1261
1262 if (!ifindex)
1263 return -ENODEV;
1264
1265 skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL);
1266 if (!skb)
1267 return -ENOMEM;
1268
1269 can_skb_reserve(skb);
1270
1271 err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz);
1272 if (err < 0) {
1273 kfree_skb(skb);
1274 return err;
1275 }
1276
1277 dev = dev_get_by_index(sock_net(sk), ifindex);
1278 if (!dev) {
1279 kfree_skb(skb);
1280 return -ENODEV;
1281 }
1282
1283 can_skb_prv(skb)->ifindex = dev->ifindex;
1284 can_skb_prv(skb)->skbcnt = 0;
1285 skb->dev = dev;
1286 can_skb_set_owner(skb, sk);
1287 err = can_send(skb, 1);
1288 dev_put(dev);
1289
1290 if (err)
1291 return err;
1292
1293 return cfsiz + MHSIZ;
1294}
1295
1296
1297
1298
1299static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1300{
1301 struct sock *sk = sock->sk;
1302 struct bcm_sock *bo = bcm_sk(sk);
1303 int ifindex = bo->ifindex;
1304 struct bcm_msg_head msg_head;
1305 int cfsiz;
1306 int ret;
1307
1308 if (!bo->bound)
1309 return -ENOTCONN;
1310
1311
1312 if (size < MHSIZ)
1313 return -EINVAL;
1314
1315
1316 ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ);
1317 if (ret < 0)
1318 return ret;
1319
1320 cfsiz = CFSIZ(msg_head.flags);
1321 if ((size - MHSIZ) % cfsiz)
1322 return -EINVAL;
1323
1324
1325
1326 if (!ifindex && msg->msg_name) {
1327
1328 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
1329
1330 if (msg->msg_namelen < sizeof(*addr))
1331 return -EINVAL;
1332
1333 if (addr->can_family != AF_CAN)
1334 return -EINVAL;
1335
1336
1337 ifindex = addr->can_ifindex;
1338
1339 if (ifindex) {
1340 struct net_device *dev;
1341
1342 dev = dev_get_by_index(sock_net(sk), ifindex);
1343 if (!dev)
1344 return -ENODEV;
1345
1346 if (dev->type != ARPHRD_CAN) {
1347 dev_put(dev);
1348 return -ENODEV;
1349 }
1350
1351 dev_put(dev);
1352 }
1353 }
1354
1355 lock_sock(sk);
1356
1357 switch (msg_head.opcode) {
1358
1359 case TX_SETUP:
1360 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1361 break;
1362
1363 case RX_SETUP:
1364 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1365 break;
1366
1367 case TX_DELETE:
1368 if (bcm_delete_tx_op(&bo->tx_ops, &msg_head, ifindex))
1369 ret = MHSIZ;
1370 else
1371 ret = -EINVAL;
1372 break;
1373
1374 case RX_DELETE:
1375 if (bcm_delete_rx_op(&bo->rx_ops, &msg_head, ifindex))
1376 ret = MHSIZ;
1377 else
1378 ret = -EINVAL;
1379 break;
1380
1381 case TX_READ:
1382
1383 msg_head.opcode = TX_STATUS;
1384 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1385 break;
1386
1387 case RX_READ:
1388
1389 msg_head.opcode = RX_STATUS;
1390 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1391 break;
1392
1393 case TX_SEND:
1394
1395 if ((msg_head.nframes != 1) || (size != cfsiz + MHSIZ))
1396 ret = -EINVAL;
1397 else
1398 ret = bcm_tx_send(msg, ifindex, sk, cfsiz);
1399 break;
1400
1401 default:
1402 ret = -EINVAL;
1403 break;
1404 }
1405
1406 release_sock(sk);
1407
1408 return ret;
1409}
1410
1411
1412
1413
1414static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
1415 void *ptr)
1416{
1417 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1418 struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
1419 struct sock *sk = &bo->sk;
1420 struct bcm_op *op;
1421 int notify_enodev = 0;
1422
1423 if (!net_eq(dev_net(dev), sock_net(sk)))
1424 return NOTIFY_DONE;
1425
1426 if (dev->type != ARPHRD_CAN)
1427 return NOTIFY_DONE;
1428
1429 switch (msg) {
1430
1431 case NETDEV_UNREGISTER:
1432 lock_sock(sk);
1433
1434
1435 list_for_each_entry(op, &bo->rx_ops, list)
1436 if (op->rx_reg_dev == dev)
1437 bcm_rx_unreg(dev, op);
1438
1439
1440 if (bo->bound && bo->ifindex == dev->ifindex) {
1441 bo->bound = 0;
1442 bo->ifindex = 0;
1443 notify_enodev = 1;
1444 }
1445
1446 release_sock(sk);
1447
1448 if (notify_enodev) {
1449 sk->sk_err = ENODEV;
1450 if (!sock_flag(sk, SOCK_DEAD))
1451 sk->sk_error_report(sk);
1452 }
1453 break;
1454
1455 case NETDEV_DOWN:
1456 if (bo->bound && bo->ifindex == dev->ifindex) {
1457 sk->sk_err = ENETDOWN;
1458 if (!sock_flag(sk, SOCK_DEAD))
1459 sk->sk_error_report(sk);
1460 }
1461 }
1462
1463 return NOTIFY_DONE;
1464}
1465
1466
1467
1468
1469static int bcm_init(struct sock *sk)
1470{
1471 struct bcm_sock *bo = bcm_sk(sk);
1472
1473 bo->bound = 0;
1474 bo->ifindex = 0;
1475 bo->dropped_usr_msgs = 0;
1476 bo->bcm_proc_read = NULL;
1477
1478 INIT_LIST_HEAD(&bo->tx_ops);
1479 INIT_LIST_HEAD(&bo->rx_ops);
1480
1481
1482 bo->notifier.notifier_call = bcm_notifier;
1483
1484 register_netdevice_notifier(&bo->notifier);
1485
1486 return 0;
1487}
1488
1489
1490
1491
1492static int bcm_release(struct socket *sock)
1493{
1494 struct sock *sk = sock->sk;
1495 struct net *net;
1496 struct bcm_sock *bo;
1497 struct bcm_op *op, *next;
1498
1499 if (!sk)
1500 return 0;
1501
1502 net = sock_net(sk);
1503 bo = bcm_sk(sk);
1504
1505
1506
1507 unregister_netdevice_notifier(&bo->notifier);
1508
1509 lock_sock(sk);
1510
1511 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1512 bcm_remove_op(op);
1513
1514 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1515
1516
1517
1518
1519 if (op->ifindex) {
1520
1521
1522
1523
1524
1525 if (op->rx_reg_dev) {
1526 struct net_device *dev;
1527
1528 dev = dev_get_by_index(net, op->ifindex);
1529 if (dev) {
1530 bcm_rx_unreg(dev, op);
1531 dev_put(dev);
1532 }
1533 }
1534 } else
1535 can_rx_unregister(net, NULL, op->can_id,
1536 REGMASK(op->can_id),
1537 bcm_rx_handler, op);
1538
1539 bcm_remove_op(op);
1540 }
1541
1542#if IS_ENABLED(CONFIG_PROC_FS)
1543
1544 if (net->can.bcmproc_dir && bo->bcm_proc_read)
1545 remove_proc_entry(bo->procname, net->can.bcmproc_dir);
1546#endif
1547
1548
1549 if (bo->bound) {
1550 bo->bound = 0;
1551 bo->ifindex = 0;
1552 }
1553
1554 sock_orphan(sk);
1555 sock->sk = NULL;
1556
1557 release_sock(sk);
1558 sock_put(sk);
1559
1560 return 0;
1561}
1562
1563static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1564 int flags)
1565{
1566 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1567 struct sock *sk = sock->sk;
1568 struct bcm_sock *bo = bcm_sk(sk);
1569 struct net *net = sock_net(sk);
1570 int ret = 0;
1571
1572 if (len < sizeof(*addr))
1573 return -EINVAL;
1574
1575 lock_sock(sk);
1576
1577 if (bo->bound) {
1578 ret = -EISCONN;
1579 goto fail;
1580 }
1581
1582
1583 if (addr->can_ifindex) {
1584 struct net_device *dev;
1585
1586 dev = dev_get_by_index(net, addr->can_ifindex);
1587 if (!dev) {
1588 ret = -ENODEV;
1589 goto fail;
1590 }
1591 if (dev->type != ARPHRD_CAN) {
1592 dev_put(dev);
1593 ret = -ENODEV;
1594 goto fail;
1595 }
1596
1597 bo->ifindex = dev->ifindex;
1598 dev_put(dev);
1599
1600 } else {
1601
1602 bo->ifindex = 0;
1603 }
1604
1605#if IS_ENABLED(CONFIG_PROC_FS)
1606 if (net->can.bcmproc_dir) {
1607
1608 sprintf(bo->procname, "%lu", sock_i_ino(sk));
1609 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1610 net->can.bcmproc_dir,
1611 &bcm_proc_fops, sk);
1612 if (!bo->bcm_proc_read) {
1613 ret = -ENOMEM;
1614 goto fail;
1615 }
1616 }
1617#endif
1618
1619 bo->bound = 1;
1620
1621fail:
1622 release_sock(sk);
1623
1624 return ret;
1625}
1626
1627static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1628 int flags)
1629{
1630 struct sock *sk = sock->sk;
1631 struct sk_buff *skb;
1632 int error = 0;
1633 int noblock;
1634 int err;
1635
1636 noblock = flags & MSG_DONTWAIT;
1637 flags &= ~MSG_DONTWAIT;
1638 skb = skb_recv_datagram(sk, flags, noblock, &error);
1639 if (!skb)
1640 return error;
1641
1642 if (skb->len < size)
1643 size = skb->len;
1644
1645 err = memcpy_to_msg(msg, skb->data, size);
1646 if (err < 0) {
1647 skb_free_datagram(sk, skb);
1648 return err;
1649 }
1650
1651 sock_recv_ts_and_drops(msg, sk, skb);
1652
1653 if (msg->msg_name) {
1654 __sockaddr_check_size(sizeof(struct sockaddr_can));
1655 msg->msg_namelen = sizeof(struct sockaddr_can);
1656 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1657 }
1658
1659 skb_free_datagram(sk, skb);
1660
1661 return size;
1662}
1663
1664static const struct proto_ops bcm_ops = {
1665 .family = PF_CAN,
1666 .release = bcm_release,
1667 .bind = sock_no_bind,
1668 .connect = bcm_connect,
1669 .socketpair = sock_no_socketpair,
1670 .accept = sock_no_accept,
1671 .getname = sock_no_getname,
1672 .poll = datagram_poll,
1673 .ioctl = can_ioctl,
1674 .listen = sock_no_listen,
1675 .shutdown = sock_no_shutdown,
1676 .setsockopt = sock_no_setsockopt,
1677 .getsockopt = sock_no_getsockopt,
1678 .sendmsg = bcm_sendmsg,
1679 .recvmsg = bcm_recvmsg,
1680 .mmap = sock_no_mmap,
1681 .sendpage = sock_no_sendpage,
1682};
1683
1684static struct proto bcm_proto __read_mostly = {
1685 .name = "CAN_BCM",
1686 .owner = THIS_MODULE,
1687 .obj_size = sizeof(struct bcm_sock),
1688 .init = bcm_init,
1689};
1690
1691static const struct can_proto bcm_can_proto = {
1692 .type = SOCK_DGRAM,
1693 .protocol = CAN_BCM,
1694 .ops = &bcm_ops,
1695 .prot = &bcm_proto,
1696};
1697
1698static int canbcm_pernet_init(struct net *net)
1699{
1700#if IS_ENABLED(CONFIG_PROC_FS)
1701
1702 net->can.bcmproc_dir = proc_net_mkdir(net, "can-bcm", net->proc_net);
1703#endif
1704
1705 return 0;
1706}
1707
1708static void canbcm_pernet_exit(struct net *net)
1709{
1710#if IS_ENABLED(CONFIG_PROC_FS)
1711
1712 if (net->can.bcmproc_dir)
1713 remove_proc_entry("can-bcm", net->proc_net);
1714#endif
1715}
1716
1717static struct pernet_operations canbcm_pernet_ops __read_mostly = {
1718 .init = canbcm_pernet_init,
1719 .exit = canbcm_pernet_exit,
1720};
1721
1722static int __init bcm_module_init(void)
1723{
1724 int err;
1725
1726 pr_info("can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n");
1727
1728 err = can_proto_register(&bcm_can_proto);
1729 if (err < 0) {
1730 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1731 return err;
1732 }
1733
1734 register_pernet_subsys(&canbcm_pernet_ops);
1735 return 0;
1736}
1737
1738static void __exit bcm_module_exit(void)
1739{
1740 can_proto_unregister(&bcm_can_proto);
1741 unregister_pernet_subsys(&canbcm_pernet_ops);
1742}
1743
1744module_init(bcm_module_init);
1745module_exit(bcm_module_exit);
1746