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42#include <linux/module.h>
43#include <linux/init.h>
44#include <linux/uio.h>
45#include <linux/net.h>
46#include <linux/slab.h>
47#include <linux/netdevice.h>
48#include <linux/socket.h>
49#include <linux/if_arp.h>
50#include <linux/skbuff.h>
51#include <linux/can.h>
52#include <linux/can/core.h>
53#include <linux/can/skb.h>
54#include <linux/can/raw.h>
55#include <net/sock.h>
56#include <net/net_namespace.h>
57
58#define CAN_RAW_VERSION CAN_VERSION
59
60MODULE_DESCRIPTION("PF_CAN raw protocol");
61MODULE_LICENSE("Dual BSD/GPL");
62MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
63MODULE_ALIAS("can-proto-1");
64
65#define MASK_ALL 0
66
67
68
69
70
71
72
73
74
75
76
77struct uniqframe {
78 int skbcnt;
79 const struct sk_buff *skb;
80 unsigned int join_rx_count;
81};
82
83struct raw_sock {
84 struct sock sk;
85 int bound;
86 int ifindex;
87 struct notifier_block notifier;
88 int loopback;
89 int recv_own_msgs;
90 int fd_frames;
91 int join_filters;
92 int count;
93 struct can_filter dfilter;
94 struct can_filter *filter;
95 can_err_mask_t err_mask;
96 struct uniqframe __percpu *uniq;
97};
98
99
100
101
102
103
104static inline unsigned int *raw_flags(struct sk_buff *skb)
105{
106 sock_skb_cb_check_size(sizeof(struct sockaddr_can) +
107 sizeof(unsigned int));
108
109
110 return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
111}
112
113static inline struct raw_sock *raw_sk(const struct sock *sk)
114{
115 return (struct raw_sock *)sk;
116}
117
118static void raw_rcv(struct sk_buff *oskb, void *data)
119{
120 struct sock *sk = (struct sock *)data;
121 struct raw_sock *ro = raw_sk(sk);
122 struct sockaddr_can *addr;
123 struct sk_buff *skb;
124 unsigned int *pflags;
125
126
127 if (!ro->recv_own_msgs && oskb->sk == sk)
128 return;
129
130
131 if (!ro->fd_frames && oskb->len != CAN_MTU)
132 return;
133
134
135 if (this_cpu_ptr(ro->uniq)->skb == oskb &&
136 this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
137 if (ro->join_filters) {
138 this_cpu_inc(ro->uniq->join_rx_count);
139
140 if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count)
141 return;
142 } else {
143 return;
144 }
145 } else {
146 this_cpu_ptr(ro->uniq)->skb = oskb;
147 this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
148 this_cpu_ptr(ro->uniq)->join_rx_count = 1;
149
150 if (ro->join_filters && ro->count > 1)
151 return;
152 }
153
154
155 skb = skb_clone(oskb, GFP_ATOMIC);
156 if (!skb)
157 return;
158
159
160
161
162
163
164
165
166 sock_skb_cb_check_size(sizeof(struct sockaddr_can));
167 addr = (struct sockaddr_can *)skb->cb;
168 memset(addr, 0, sizeof(*addr));
169 addr->can_family = AF_CAN;
170 addr->can_ifindex = skb->dev->ifindex;
171
172
173 pflags = raw_flags(skb);
174 *pflags = 0;
175 if (oskb->sk)
176 *pflags |= MSG_DONTROUTE;
177 if (oskb->sk == sk)
178 *pflags |= MSG_CONFIRM;
179
180 if (sock_queue_rcv_skb(sk, skb) < 0)
181 kfree_skb(skb);
182}
183
184static int raw_enable_filters(struct net *net, struct net_device *dev,
185 struct sock *sk, struct can_filter *filter,
186 int count)
187{
188 int err = 0;
189 int i;
190
191 for (i = 0; i < count; i++) {
192 err = can_rx_register(net, dev, filter[i].can_id,
193 filter[i].can_mask,
194 raw_rcv, sk, "raw", sk);
195 if (err) {
196
197 while (--i >= 0)
198 can_rx_unregister(net, dev, filter[i].can_id,
199 filter[i].can_mask,
200 raw_rcv, sk);
201 break;
202 }
203 }
204
205 return err;
206}
207
208static int raw_enable_errfilter(struct net *net, struct net_device *dev,
209 struct sock *sk, can_err_mask_t err_mask)
210{
211 int err = 0;
212
213 if (err_mask)
214 err = can_rx_register(net, dev, 0, err_mask | CAN_ERR_FLAG,
215 raw_rcv, sk, "raw", sk);
216
217 return err;
218}
219
220static void raw_disable_filters(struct net *net, struct net_device *dev,
221 struct sock *sk, struct can_filter *filter,
222 int count)
223{
224 int i;
225
226 for (i = 0; i < count; i++)
227 can_rx_unregister(net, dev, filter[i].can_id,
228 filter[i].can_mask, raw_rcv, sk);
229}
230
231static inline void raw_disable_errfilter(struct net *net,
232 struct net_device *dev,
233 struct sock *sk,
234 can_err_mask_t err_mask)
235
236{
237 if (err_mask)
238 can_rx_unregister(net, dev, 0, err_mask | CAN_ERR_FLAG,
239 raw_rcv, sk);
240}
241
242static inline void raw_disable_allfilters(struct net *net,
243 struct net_device *dev,
244 struct sock *sk)
245{
246 struct raw_sock *ro = raw_sk(sk);
247
248 raw_disable_filters(net, dev, sk, ro->filter, ro->count);
249 raw_disable_errfilter(net, dev, sk, ro->err_mask);
250}
251
252static int raw_enable_allfilters(struct net *net, struct net_device *dev,
253 struct sock *sk)
254{
255 struct raw_sock *ro = raw_sk(sk);
256 int err;
257
258 err = raw_enable_filters(net, dev, sk, ro->filter, ro->count);
259 if (!err) {
260 err = raw_enable_errfilter(net, dev, sk, ro->err_mask);
261 if (err)
262 raw_disable_filters(net, dev, sk, ro->filter,
263 ro->count);
264 }
265
266 return err;
267}
268
269static int raw_notifier(struct notifier_block *nb,
270 unsigned long msg, void *ptr)
271{
272 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
273 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
274 struct sock *sk = &ro->sk;
275
276 if (!net_eq(dev_net(dev), sock_net(sk)))
277 return NOTIFY_DONE;
278
279 if (dev->type != ARPHRD_CAN)
280 return NOTIFY_DONE;
281
282 if (ro->ifindex != dev->ifindex)
283 return NOTIFY_DONE;
284
285 switch (msg) {
286
287 case NETDEV_UNREGISTER:
288 lock_sock(sk);
289
290 if (ro->bound)
291 raw_disable_allfilters(dev_net(dev), dev, sk);
292
293 if (ro->count > 1)
294 kfree(ro->filter);
295
296 ro->ifindex = 0;
297 ro->bound = 0;
298 ro->count = 0;
299 release_sock(sk);
300
301 sk->sk_err = ENODEV;
302 if (!sock_flag(sk, SOCK_DEAD))
303 sk->sk_error_report(sk);
304 break;
305
306 case NETDEV_DOWN:
307 sk->sk_err = ENETDOWN;
308 if (!sock_flag(sk, SOCK_DEAD))
309 sk->sk_error_report(sk);
310 break;
311 }
312
313 return NOTIFY_DONE;
314}
315
316static int raw_init(struct sock *sk)
317{
318 struct raw_sock *ro = raw_sk(sk);
319
320 ro->bound = 0;
321 ro->ifindex = 0;
322
323
324 ro->dfilter.can_id = 0;
325 ro->dfilter.can_mask = MASK_ALL;
326 ro->filter = &ro->dfilter;
327 ro->count = 1;
328
329
330 ro->loopback = 1;
331 ro->recv_own_msgs = 0;
332 ro->fd_frames = 0;
333 ro->join_filters = 0;
334
335
336 ro->uniq = alloc_percpu(struct uniqframe);
337 if (unlikely(!ro->uniq))
338 return -ENOMEM;
339
340
341 ro->notifier.notifier_call = raw_notifier;
342
343 register_netdevice_notifier(&ro->notifier);
344
345 return 0;
346}
347
348static int raw_release(struct socket *sock)
349{
350 struct sock *sk = sock->sk;
351 struct raw_sock *ro;
352
353 if (!sk)
354 return 0;
355
356 ro = raw_sk(sk);
357
358 unregister_netdevice_notifier(&ro->notifier);
359
360 lock_sock(sk);
361
362
363 if (ro->bound) {
364 if (ro->ifindex) {
365 struct net_device *dev;
366
367 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
368 if (dev) {
369 raw_disable_allfilters(dev_net(dev), dev, sk);
370 dev_put(dev);
371 }
372 } else
373 raw_disable_allfilters(sock_net(sk), NULL, sk);
374 }
375
376 if (ro->count > 1)
377 kfree(ro->filter);
378
379 ro->ifindex = 0;
380 ro->bound = 0;
381 ro->count = 0;
382 free_percpu(ro->uniq);
383
384 sock_orphan(sk);
385 sock->sk = NULL;
386
387 release_sock(sk);
388 sock_put(sk);
389
390 return 0;
391}
392
393static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
394{
395 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
396 struct sock *sk = sock->sk;
397 struct raw_sock *ro = raw_sk(sk);
398 int ifindex;
399 int err = 0;
400 int notify_enetdown = 0;
401
402 if (len < sizeof(*addr))
403 return -EINVAL;
404 if (addr->can_family != AF_CAN)
405 return -EINVAL;
406
407 lock_sock(sk);
408
409 if (ro->bound && addr->can_ifindex == ro->ifindex)
410 goto out;
411
412 if (addr->can_ifindex) {
413 struct net_device *dev;
414
415 dev = dev_get_by_index(sock_net(sk), addr->can_ifindex);
416 if (!dev) {
417 err = -ENODEV;
418 goto out;
419 }
420 if (dev->type != ARPHRD_CAN) {
421 dev_put(dev);
422 err = -ENODEV;
423 goto out;
424 }
425 if (!(dev->flags & IFF_UP))
426 notify_enetdown = 1;
427
428 ifindex = dev->ifindex;
429
430
431 err = raw_enable_allfilters(sock_net(sk), dev, sk);
432 dev_put(dev);
433 } else {
434 ifindex = 0;
435
436
437 err = raw_enable_allfilters(sock_net(sk), NULL, sk);
438 }
439
440 if (!err) {
441 if (ro->bound) {
442
443 if (ro->ifindex) {
444 struct net_device *dev;
445
446 dev = dev_get_by_index(sock_net(sk),
447 ro->ifindex);
448 if (dev) {
449 raw_disable_allfilters(dev_net(dev),
450 dev, sk);
451 dev_put(dev);
452 }
453 } else
454 raw_disable_allfilters(sock_net(sk), NULL, sk);
455 }
456 ro->ifindex = ifindex;
457 ro->bound = 1;
458 }
459
460 out:
461 release_sock(sk);
462
463 if (notify_enetdown) {
464 sk->sk_err = ENETDOWN;
465 if (!sock_flag(sk, SOCK_DEAD))
466 sk->sk_error_report(sk);
467 }
468
469 return err;
470}
471
472static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
473 int peer)
474{
475 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
476 struct sock *sk = sock->sk;
477 struct raw_sock *ro = raw_sk(sk);
478
479 if (peer)
480 return -EOPNOTSUPP;
481
482 memset(addr, 0, sizeof(*addr));
483 addr->can_family = AF_CAN;
484 addr->can_ifindex = ro->ifindex;
485
486 return sizeof(*addr);
487}
488
489static int raw_setsockopt(struct socket *sock, int level, int optname,
490 char __user *optval, unsigned int optlen)
491{
492 struct sock *sk = sock->sk;
493 struct raw_sock *ro = raw_sk(sk);
494 struct can_filter *filter = NULL;
495 struct can_filter sfilter;
496 struct net_device *dev = NULL;
497 can_err_mask_t err_mask = 0;
498 int count = 0;
499 int err = 0;
500
501 if (level != SOL_CAN_RAW)
502 return -EINVAL;
503
504 switch (optname) {
505
506 case CAN_RAW_FILTER:
507 if (optlen % sizeof(struct can_filter) != 0)
508 return -EINVAL;
509
510 if (optlen > CAN_RAW_FILTER_MAX * sizeof(struct can_filter))
511 return -EINVAL;
512
513 count = optlen / sizeof(struct can_filter);
514
515 if (count > 1) {
516
517 filter = memdup_user(optval, optlen);
518 if (IS_ERR(filter))
519 return PTR_ERR(filter);
520 } else if (count == 1) {
521 if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
522 return -EFAULT;
523 }
524
525 lock_sock(sk);
526
527 if (ro->bound && ro->ifindex)
528 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
529
530 if (ro->bound) {
531
532 if (count == 1)
533 err = raw_enable_filters(sock_net(sk), dev, sk,
534 &sfilter, 1);
535 else
536 err = raw_enable_filters(sock_net(sk), dev, sk,
537 filter, count);
538 if (err) {
539 if (count > 1)
540 kfree(filter);
541 goto out_fil;
542 }
543
544
545 raw_disable_filters(sock_net(sk), dev, sk, ro->filter,
546 ro->count);
547 }
548
549
550 if (ro->count > 1)
551 kfree(ro->filter);
552
553
554 if (count == 1) {
555
556 ro->dfilter = sfilter;
557 filter = &ro->dfilter;
558 }
559 ro->filter = filter;
560 ro->count = count;
561
562 out_fil:
563 if (dev)
564 dev_put(dev);
565
566 release_sock(sk);
567
568 break;
569
570 case CAN_RAW_ERR_FILTER:
571 if (optlen != sizeof(err_mask))
572 return -EINVAL;
573
574 if (copy_from_user(&err_mask, optval, optlen))
575 return -EFAULT;
576
577 err_mask &= CAN_ERR_MASK;
578
579 lock_sock(sk);
580
581 if (ro->bound && ro->ifindex)
582 dev = dev_get_by_index(sock_net(sk), ro->ifindex);
583
584
585 if (ro->bound) {
586
587 err = raw_enable_errfilter(sock_net(sk), dev, sk,
588 err_mask);
589
590 if (err)
591 goto out_err;
592
593
594 raw_disable_errfilter(sock_net(sk), dev, sk,
595 ro->err_mask);
596 }
597
598
599 ro->err_mask = err_mask;
600
601 out_err:
602 if (dev)
603 dev_put(dev);
604
605 release_sock(sk);
606
607 break;
608
609 case CAN_RAW_LOOPBACK:
610 if (optlen != sizeof(ro->loopback))
611 return -EINVAL;
612
613 if (copy_from_user(&ro->loopback, optval, optlen))
614 return -EFAULT;
615
616 break;
617
618 case CAN_RAW_RECV_OWN_MSGS:
619 if (optlen != sizeof(ro->recv_own_msgs))
620 return -EINVAL;
621
622 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
623 return -EFAULT;
624
625 break;
626
627 case CAN_RAW_FD_FRAMES:
628 if (optlen != sizeof(ro->fd_frames))
629 return -EINVAL;
630
631 if (copy_from_user(&ro->fd_frames, optval, optlen))
632 return -EFAULT;
633
634 break;
635
636 case CAN_RAW_JOIN_FILTERS:
637 if (optlen != sizeof(ro->join_filters))
638 return -EINVAL;
639
640 if (copy_from_user(&ro->join_filters, optval, optlen))
641 return -EFAULT;
642
643 break;
644
645 default:
646 return -ENOPROTOOPT;
647 }
648 return err;
649}
650
651static int raw_getsockopt(struct socket *sock, int level, int optname,
652 char __user *optval, int __user *optlen)
653{
654 struct sock *sk = sock->sk;
655 struct raw_sock *ro = raw_sk(sk);
656 int len;
657 void *val;
658 int err = 0;
659
660 if (level != SOL_CAN_RAW)
661 return -EINVAL;
662 if (get_user(len, optlen))
663 return -EFAULT;
664 if (len < 0)
665 return -EINVAL;
666
667 switch (optname) {
668
669 case CAN_RAW_FILTER:
670 lock_sock(sk);
671 if (ro->count > 0) {
672 int fsize = ro->count * sizeof(struct can_filter);
673 if (len > fsize)
674 len = fsize;
675 if (copy_to_user(optval, ro->filter, len))
676 err = -EFAULT;
677 } else
678 len = 0;
679 release_sock(sk);
680
681 if (!err)
682 err = put_user(len, optlen);
683 return err;
684
685 case CAN_RAW_ERR_FILTER:
686 if (len > sizeof(can_err_mask_t))
687 len = sizeof(can_err_mask_t);
688 val = &ro->err_mask;
689 break;
690
691 case CAN_RAW_LOOPBACK:
692 if (len > sizeof(int))
693 len = sizeof(int);
694 val = &ro->loopback;
695 break;
696
697 case CAN_RAW_RECV_OWN_MSGS:
698 if (len > sizeof(int))
699 len = sizeof(int);
700 val = &ro->recv_own_msgs;
701 break;
702
703 case CAN_RAW_FD_FRAMES:
704 if (len > sizeof(int))
705 len = sizeof(int);
706 val = &ro->fd_frames;
707 break;
708
709 case CAN_RAW_JOIN_FILTERS:
710 if (len > sizeof(int))
711 len = sizeof(int);
712 val = &ro->join_filters;
713 break;
714
715 default:
716 return -ENOPROTOOPT;
717 }
718
719 if (put_user(len, optlen))
720 return -EFAULT;
721 if (copy_to_user(optval, val, len))
722 return -EFAULT;
723 return 0;
724}
725
726static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
727{
728 struct sock *sk = sock->sk;
729 struct raw_sock *ro = raw_sk(sk);
730 struct sk_buff *skb;
731 struct net_device *dev;
732 int ifindex;
733 int err;
734
735 if (msg->msg_name) {
736 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
737
738 if (msg->msg_namelen < sizeof(*addr))
739 return -EINVAL;
740
741 if (addr->can_family != AF_CAN)
742 return -EINVAL;
743
744 ifindex = addr->can_ifindex;
745 } else
746 ifindex = ro->ifindex;
747
748 dev = dev_get_by_index(sock_net(sk), ifindex);
749 if (!dev)
750 return -ENXIO;
751
752 err = -EINVAL;
753 if (ro->fd_frames && dev->mtu == CANFD_MTU) {
754 if (unlikely(size != CANFD_MTU && size != CAN_MTU))
755 goto put_dev;
756 } else {
757 if (unlikely(size != CAN_MTU))
758 goto put_dev;
759 }
760
761 skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
762 msg->msg_flags & MSG_DONTWAIT, &err);
763 if (!skb)
764 goto put_dev;
765
766 can_skb_reserve(skb);
767 can_skb_prv(skb)->ifindex = dev->ifindex;
768 can_skb_prv(skb)->skbcnt = 0;
769
770 err = memcpy_from_msg(skb_put(skb, size), msg, size);
771 if (err < 0)
772 goto free_skb;
773
774 skb_setup_tx_timestamp(skb, sk->sk_tsflags);
775
776 skb->dev = dev;
777 skb->sk = sk;
778 skb->priority = sk->sk_priority;
779
780 err = can_send(skb, ro->loopback);
781
782 dev_put(dev);
783
784 if (err)
785 goto send_failed;
786
787 return size;
788
789free_skb:
790 kfree_skb(skb);
791put_dev:
792 dev_put(dev);
793send_failed:
794 return err;
795}
796
797static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
798 int flags)
799{
800 struct sock *sk = sock->sk;
801 struct sk_buff *skb;
802 int err = 0;
803 int noblock;
804
805 noblock = flags & MSG_DONTWAIT;
806 flags &= ~MSG_DONTWAIT;
807
808 skb = skb_recv_datagram(sk, flags, noblock, &err);
809 if (!skb)
810 return err;
811
812 if (size < skb->len)
813 msg->msg_flags |= MSG_TRUNC;
814 else
815 size = skb->len;
816
817 err = memcpy_to_msg(msg, skb->data, size);
818 if (err < 0) {
819 skb_free_datagram(sk, skb);
820 return err;
821 }
822
823 sock_recv_ts_and_drops(msg, sk, skb);
824
825 if (msg->msg_name) {
826 __sockaddr_check_size(sizeof(struct sockaddr_can));
827 msg->msg_namelen = sizeof(struct sockaddr_can);
828 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
829 }
830
831
832 msg->msg_flags |= *(raw_flags(skb));
833
834 skb_free_datagram(sk, skb);
835
836 return size;
837}
838
839static const struct proto_ops raw_ops = {
840 .family = PF_CAN,
841 .release = raw_release,
842 .bind = raw_bind,
843 .connect = sock_no_connect,
844 .socketpair = sock_no_socketpair,
845 .accept = sock_no_accept,
846 .getname = raw_getname,
847 .poll = datagram_poll,
848 .ioctl = can_ioctl,
849 .listen = sock_no_listen,
850 .shutdown = sock_no_shutdown,
851 .setsockopt = raw_setsockopt,
852 .getsockopt = raw_getsockopt,
853 .sendmsg = raw_sendmsg,
854 .recvmsg = raw_recvmsg,
855 .mmap = sock_no_mmap,
856 .sendpage = sock_no_sendpage,
857};
858
859static struct proto raw_proto __read_mostly = {
860 .name = "CAN_RAW",
861 .owner = THIS_MODULE,
862 .obj_size = sizeof(struct raw_sock),
863 .init = raw_init,
864};
865
866static const struct can_proto raw_can_proto = {
867 .type = SOCK_RAW,
868 .protocol = CAN_RAW,
869 .ops = &raw_ops,
870 .prot = &raw_proto,
871};
872
873static __init int raw_module_init(void)
874{
875 int err;
876
877 pr_info("can: raw protocol (rev " CAN_RAW_VERSION ")\n");
878
879 err = can_proto_register(&raw_can_proto);
880 if (err < 0)
881 printk(KERN_ERR "can: registration of raw protocol failed\n");
882
883 return err;
884}
885
886static __exit void raw_module_exit(void)
887{
888 can_proto_unregister(&raw_can_proto);
889}
890
891module_init(raw_module_init);
892module_exit(raw_module_exit);
893