2 * raw.c - Raw sockets for protocol family CAN
4 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of Volkswagen nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above.
24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules with a GPL compatible license.
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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40 * Send feedback to <socketcan-users@lists.berlios.de>
44 #include <linux/module.h>
45 #include <linux/version.h>
46 #include <linux/init.h>
47 #include <linux/uio.h>
48 #include <linux/net.h>
49 #include <linux/netdevice.h>
50 #include <linux/socket.h>
51 #include <linux/if_arp.h>
52 #include <linux/skbuff.h>
53 #include <linux/can.h>
54 #include <linux/can/core.h>
55 #include <linux/can/raw.h>
57 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
58 #include <net/net_namespace.h>
60 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
64 #include <linux/can/version.h> /* for RCSID. Removed by mkpatch script */
67 #define CAN_RAW_VERSION CAN_VERSION
68 static __initdata const char banner[] =
69 KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
71 MODULE_DESCRIPTION("PF_CAN raw protocol");
72 MODULE_LICENSE("Dual BSD/GPL");
73 MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
78 * A raw socket has a list of can_filters attached to it, each receiving
79 * the CAN frames matching that filter. If the filter list is empty,
80 * no CAN frames will be received by the socket. The default after
81 * opening the socket, is to have one filter which receives all frames.
82 * The filter list is allocated dynamically with the exception of the
83 * list containing only one item. This common case is optimized by
84 * storing the single filter in dfilter, to avoid using dynamic memory.
88 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
95 struct notifier_block notifier;
98 int count; /* number of active filters */
99 struct can_filter dfilter; /* default/single filter */
100 struct can_filter *filter; /* pointer to filter(s) */
101 can_err_mask_t err_mask;
104 static inline struct raw_sock *raw_sk(const struct sock *sk)
106 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
107 return (struct raw_sock *)sk;
109 return (struct raw_sock *)sk->sk_protinfo;
113 static void raw_rcv(struct sk_buff *skb, void *data)
115 struct sock *sk = (struct sock *)data;
116 struct raw_sock *ro = raw_sk(sk);
117 struct sockaddr_can *addr;
120 if (!ro->recv_own_msgs) {
121 /* check the received tx sock reference */
129 * Put the datagram to the queue so that raw_recvmsg() can
130 * get it from there. We need to pass the interface index to
131 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
132 * containing the interface index.
135 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
136 addr = (struct sockaddr_can *)skb->cb;
137 memset(addr, 0, sizeof(*addr));
138 addr->can_family = AF_CAN;
139 addr->can_ifindex = skb->dev->ifindex;
141 error = sock_queue_rcv_skb(sk, skb);
146 static int raw_enable_filters(struct net_device *dev, struct sock *sk,
147 struct can_filter *filter,
153 for (i = 0; i < count; i++) {
154 err = can_rx_register(dev, filter[i].can_id,
158 /* clean up successfully registered filters */
160 can_rx_unregister(dev, filter[i].can_id,
170 static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
171 can_err_mask_t err_mask)
176 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
182 static void raw_disable_filters(struct net_device *dev, struct sock *sk,
183 struct can_filter *filter,
188 for (i = 0; i < count; i++)
189 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
193 static inline void raw_disable_errfilter(struct net_device *dev,
195 can_err_mask_t err_mask)
199 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
203 static inline void raw_disable_allfilters(struct net_device *dev,
206 struct raw_sock *ro = raw_sk(sk);
208 raw_disable_filters(dev, sk, ro->filter, ro->count);
209 raw_disable_errfilter(dev, sk, ro->err_mask);
212 static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
214 struct raw_sock *ro = raw_sk(sk);
217 err = raw_enable_filters(dev, sk, ro->filter, ro->count);
219 err = raw_enable_errfilter(dev, sk, ro->err_mask);
221 raw_disable_filters(dev, sk, ro->filter, ro->count);
227 static int raw_notifier(struct notifier_block *nb,
228 unsigned long msg, void *data)
230 struct net_device *dev = (struct net_device *)data;
231 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
232 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
233 struct sock *sk = &ro->sk;
235 struct sock *sk = ro->sk;
238 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
239 if (dev->nd_net != &init_net)
243 if (dev->type != ARPHRD_CAN)
246 if (ro->ifindex != dev->ifindex)
251 case NETDEV_UNREGISTER:
253 /* remove current filters & unregister */
255 raw_disable_allfilters(dev, sk);
266 if (!sock_flag(sk, SOCK_DEAD))
267 sk->sk_error_report(sk);
271 sk->sk_err = ENETDOWN;
272 if (!sock_flag(sk, SOCK_DEAD))
273 sk->sk_error_report(sk);
280 static int raw_init(struct sock *sk)
282 struct raw_sock *ro = raw_sk(sk);
284 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,12)
290 /* set default filter to single entry dfilter */
291 ro->dfilter.can_id = 0;
292 ro->dfilter.can_mask = MASK_ALL;
293 ro->filter = &ro->dfilter;
296 /* set default loopback behaviour */
298 ro->recv_own_msgs = 0;
301 ro->notifier.notifier_call = raw_notifier;
303 register_netdevice_notifier(&ro->notifier);
308 static int raw_release(struct socket *sock)
310 struct sock *sk = sock->sk;
311 struct raw_sock *ro = raw_sk(sk);
313 unregister_netdevice_notifier(&ro->notifier);
317 /* remove current filters & unregister */
320 struct net_device *dev;
322 dev = dev_get_by_index(&init_net, ro->ifindex);
324 raw_disable_allfilters(dev, sk);
328 raw_disable_allfilters(NULL, sk);
344 static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
346 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
347 struct sock *sk = sock->sk;
348 struct raw_sock *ro = raw_sk(sk);
351 int notify_enetdown = 0;
353 if (len < sizeof(*addr))
358 if (ro->bound && addr->can_ifindex == ro->ifindex)
361 if (addr->can_ifindex) {
362 struct net_device *dev;
364 dev = dev_get_by_index(&init_net, addr->can_ifindex);
369 if (dev->type != ARPHRD_CAN) {
374 if (!(dev->flags & IFF_UP))
377 ifindex = dev->ifindex;
379 /* filters set by default/setsockopt */
380 err = raw_enable_allfilters(dev, sk);
386 /* filters set by default/setsockopt */
387 err = raw_enable_allfilters(NULL, sk);
392 /* unregister old filters */
394 struct net_device *dev;
396 dev = dev_get_by_index(&init_net, ro->ifindex);
398 raw_disable_allfilters(dev, sk);
402 raw_disable_allfilters(NULL, sk);
404 ro->ifindex = ifindex;
411 if (notify_enetdown) {
412 sk->sk_err = ENETDOWN;
413 if (!sock_flag(sk, SOCK_DEAD))
414 sk->sk_error_report(sk);
420 static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
423 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
424 struct sock *sk = sock->sk;
425 struct raw_sock *ro = raw_sk(sk);
430 addr->can_family = AF_CAN;
431 addr->can_ifindex = ro->ifindex;
433 *len = sizeof(*addr);
438 static int raw_setsockopt(struct socket *sock, int level, int optname,
439 char __user *optval, int optlen)
441 struct sock *sk = sock->sk;
442 struct raw_sock *ro = raw_sk(sk);
443 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
444 struct can_filter sfilter; /* single filter */
445 struct net_device *dev = NULL;
446 can_err_mask_t err_mask = 0;
450 if (level != SOL_CAN_RAW)
458 if (optlen % sizeof(struct can_filter) != 0)
461 count = optlen / sizeof(struct can_filter);
464 /* filter does not fit into dfilter => alloc space */
465 filter = kmalloc(optlen, GFP_KERNEL);
469 err = copy_from_user(filter, optval, optlen);
474 } else if (count == 1) {
475 err = copy_from_user(&sfilter, optval, optlen);
482 if (ro->bound && ro->ifindex)
483 dev = dev_get_by_index(&init_net, ro->ifindex);
486 /* (try to) register the new filters */
488 err = raw_enable_filters(dev, sk, &sfilter, 1);
490 err = raw_enable_filters(dev, sk, filter,
499 /* remove old filter registrations */
500 raw_disable_filters(dev, sk, ro->filter, ro->count);
503 /* remove old filter space */
507 /* link new filters to the socket */
509 /* copy filter data for single filter */
510 ro->dfilter = sfilter;
511 filter = &ro->dfilter;
524 case CAN_RAW_ERR_FILTER:
525 if (optlen != sizeof(err_mask))
528 err = copy_from_user(&err_mask, optval, optlen);
532 err_mask &= CAN_ERR_MASK;
536 if (ro->bound && ro->ifindex)
537 dev = dev_get_by_index(&init_net, ro->ifindex);
539 /* remove current error mask */
541 /* (try to) register the new err_mask */
542 err = raw_enable_errfilter(dev, sk, err_mask);
547 /* remove old err_mask registration */
548 raw_disable_errfilter(dev, sk, ro->err_mask);
551 /* link new err_mask to the socket */
552 ro->err_mask = err_mask;
562 case CAN_RAW_LOOPBACK:
563 if (optlen != sizeof(ro->loopback))
566 err = copy_from_user(&ro->loopback, optval, optlen);
570 case CAN_RAW_RECV_OWN_MSGS:
571 if (optlen != sizeof(ro->recv_own_msgs))
574 err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
584 static int raw_getsockopt(struct socket *sock, int level, int optname,
585 char __user *optval, int __user *optlen)
587 struct sock *sk = sock->sk;
588 struct raw_sock *ro = raw_sk(sk);
593 if (level != SOL_CAN_RAW)
595 if (get_user(len, optlen))
605 int fsize = ro->count * sizeof(struct can_filter);
608 err = copy_to_user(optval, ro->filter, len);
614 err = put_user(len, optlen);
617 case CAN_RAW_ERR_FILTER:
618 if (len > sizeof(can_err_mask_t))
619 len = sizeof(can_err_mask_t);
623 case CAN_RAW_LOOPBACK:
624 if (len > sizeof(int))
629 case CAN_RAW_RECV_OWN_MSGS:
630 if (len > sizeof(int))
632 val = &ro->recv_own_msgs;
639 if (put_user(len, optlen))
641 if (copy_to_user(optval, val, len))
646 static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
647 struct msghdr *msg, size_t size)
649 struct sock *sk = sock->sk;
650 struct raw_sock *ro = raw_sk(sk);
652 struct net_device *dev;
657 struct sockaddr_can *addr =
658 (struct sockaddr_can *)msg->msg_name;
660 if (addr->can_family != AF_CAN)
663 ifindex = addr->can_ifindex;
665 ifindex = ro->ifindex;
667 dev = dev_get_by_index(&init_net, ifindex);
671 skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
678 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
687 err = can_send(skb, ro->loopback);
697 static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
698 struct msghdr *msg, size_t size, int flags)
700 struct sock *sk = sock->sk;
705 noblock = flags & MSG_DONTWAIT;
706 flags &= ~MSG_DONTWAIT;
708 skb = skb_recv_datagram(sk, flags, noblock, &error);
713 msg->msg_flags |= MSG_TRUNC;
717 error = memcpy_toiovec(msg->msg_iov, skb->data, size);
719 skb_free_datagram(sk, skb);
723 sock_recv_timestamp(msg, sk, skb);
726 msg->msg_namelen = sizeof(struct sockaddr_can);
727 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
730 skb_free_datagram(sk, skb);
735 static struct proto_ops raw_ops __read_mostly = {
737 .release = raw_release,
739 .connect = sock_no_connect,
740 .socketpair = sock_no_socketpair,
741 .accept = sock_no_accept,
742 .getname = raw_getname,
743 .poll = datagram_poll,
744 .ioctl = NULL, /* use can_ioctl() from af_can.c */
745 .listen = sock_no_listen,
746 .shutdown = sock_no_shutdown,
747 .setsockopt = raw_setsockopt,
748 .getsockopt = raw_getsockopt,
749 .sendmsg = raw_sendmsg,
750 .recvmsg = raw_recvmsg,
751 .mmap = sock_no_mmap,
752 .sendpage = sock_no_sendpage,
755 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
756 static struct proto raw_proto __read_mostly = {
758 .owner = THIS_MODULE,
759 .obj_size = sizeof(struct raw_sock),
763 static struct can_proto raw_can_proto __read_mostly = {
771 static struct can_proto raw_can_proto __read_mostly = {
776 .owner = THIS_MODULE,
777 .obj_size = sizeof(struct raw_sock),
782 static __init int raw_module_init(void)
788 err = can_proto_register(&raw_can_proto);
790 printk(KERN_ERR "can: registration of raw protocol failed\n");
795 static __exit void raw_module_exit(void)
797 can_proto_unregister(&raw_can_proto);
800 module_init(raw_module_init);
801 module_exit(raw_module_exit);