4 This patch adds the CAN raw protocol.
6 Signed-off-by: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
7 Signed-off-by: Urs Thuermann <urs.thuermann@volkswagen.de>
10 include/linux/can/raw.h | 31 +
13 net/can/raw.c | 763 ++++++++++++++++++++++++++++++++++++++++++++++++
14 4 files changed, 808 insertions(+)
16 Index: net-2.6.25/include/linux/can/raw.h
17 ===================================================================
18 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
19 +++ net-2.6.25/include/linux/can/raw.h 2007-11-16 14:40:14.000000000 +0100
24 + * Definitions for raw CAN sockets
26 + * Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
27 + * Urs Thuermann <urs.thuermann@volkswagen.de>
28 + * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
29 + * All rights reserved.
31 + * Send feedback to <socketcan-users@lists.berlios.de>
38 +#include <linux/can.h>
40 +#define SOL_CAN_RAW (SOL_CAN_BASE + CAN_RAW)
42 +/* for socket options affecting the socket (not the global system) */
45 + CAN_RAW_FILTER = 1, /* set 0 .. n can_filter(s) */
46 + CAN_RAW_ERR_FILTER, /* set filter for error frames */
47 + CAN_RAW_LOOPBACK, /* local loopback (default:on) */
48 + CAN_RAW_RECV_OWN_MSGS /* receive my own msgs (default:off) */
52 Index: net-2.6.25/net/can/Kconfig
53 ===================================================================
54 --- net-2.6.25.orig/net/can/Kconfig 2007-11-16 14:34:20.000000000 +0100
55 +++ net-2.6.25/net/can/Kconfig 2007-11-16 14:42:30.000000000 +0100
58 If you want CAN support you should say Y here and also to the
59 specific driver for your controller(s) below.
62 + tristate "Raw CAN Protocol (raw access with CAN-ID filtering)"
66 + The raw CAN protocol option offers access to the CAN bus via
67 + the BSD socket API. You probably want to use the raw socket in
68 + most cases where no higher level protocol is being used. The raw
69 + socket has several filter options e.g. ID masking / error frames.
70 + To receive/send raw CAN messages, use AF_CAN with protocol CAN_RAW.
71 Index: net-2.6.25/net/can/Makefile
72 ===================================================================
73 --- net-2.6.25.orig/net/can/Makefile 2007-11-16 14:25:56.000000000 +0100
74 +++ net-2.6.25/net/can/Makefile 2007-11-16 14:40:14.000000000 +0100
77 obj-$(CONFIG_CAN) += can.o
78 can-objs := af_can.o proc.o
80 +obj-$(CONFIG_CAN_RAW) += can-raw.o
81 +can-raw-objs := raw.o
82 Index: net-2.6.25/net/can/raw.c
83 ===================================================================
84 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
85 +++ net-2.6.25/net/can/raw.c 2007-11-16 14:43:29.000000000 +0100
88 + * raw.c - Raw sockets for protocol family CAN
90 + * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
91 + * All rights reserved.
93 + * Redistribution and use in source and binary forms, with or without
94 + * modification, are permitted provided that the following conditions
96 + * 1. Redistributions of source code must retain the above copyright
97 + * notice, this list of conditions and the following disclaimer.
98 + * 2. Redistributions in binary form must reproduce the above copyright
99 + * notice, this list of conditions and the following disclaimer in the
100 + * documentation and/or other materials provided with the distribution.
101 + * 3. Neither the name of Volkswagen nor the names of its contributors
102 + * may be used to endorse or promote products derived from this software
103 + * without specific prior written permission.
105 + * Alternatively, provided that this notice is retained in full, this
106 + * software may be distributed under the terms of the GNU General
107 + * Public License ("GPL") version 2, in which case the provisions of the
108 + * GPL apply INSTEAD OF those given above.
110 + * The provided data structures and external interfaces from this code
111 + * are not restricted to be used by modules with a GPL compatible license.
113 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
114 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
115 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
116 + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
117 + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
118 + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
119 + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
120 + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
121 + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
122 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
123 + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
126 + * Send feedback to <socketcan-users@lists.berlios.de>
130 +#include <linux/module.h>
131 +#include <linux/init.h>
132 +#include <linux/uio.h>
133 +#include <linux/net.h>
134 +#include <linux/netdevice.h>
135 +#include <linux/socket.h>
136 +#include <linux/if_arp.h>
137 +#include <linux/skbuff.h>
138 +#include <linux/can.h>
139 +#include <linux/can/core.h>
140 +#include <linux/can/raw.h>
141 +#include <net/sock.h>
142 +#include <net/net_namespace.h>
144 +#define CAN_RAW_VERSION CAN_VERSION
145 +static __initdata const char banner[] =
146 + KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
148 +MODULE_DESCRIPTION("PF_CAN raw protocol");
149 +MODULE_LICENSE("Dual BSD/GPL");
150 +MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
155 + * A raw socket has a list of can_filters attached to it, each receiving
156 + * the CAN frames matching that filter. If the filter list is empty,
157 + * no CAN frames will be received by the socket. The default after
158 + * opening the socket, is to have one filter which receives all frames.
159 + * The filter list is allocated dynamically with the exception of the
160 + * list containing only one item. This common case is optimized by
161 + * storing the single filter in dfilter, to avoid using dynamic memory.
168 + struct notifier_block notifier;
171 + int count; /* number of active filters */
172 + struct can_filter dfilter; /* default/single filter */
173 + struct can_filter *filter; /* pointer to filter(s) */
174 + can_err_mask_t err_mask;
177 +static inline struct raw_sock *raw_sk(const struct sock *sk)
179 + return (struct raw_sock *)sk;
182 +static void raw_rcv(struct sk_buff *skb, void *data)
184 + struct sock *sk = (struct sock *)data;
185 + struct raw_sock *ro = raw_sk(sk);
186 + struct sockaddr_can *addr;
189 + if (!ro->recv_own_msgs) {
190 + /* check the received tx sock reference */
191 + if (skb->sk == sk) {
198 + * Put the datagram to the queue so that raw_recvmsg() can
199 + * get it from there. We need to pass the interface index to
200 + * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
201 + * containing the interface index.
204 + BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
205 + addr = (struct sockaddr_can *)skb->cb;
206 + memset(addr, 0, sizeof(*addr));
207 + addr->can_family = AF_CAN;
208 + addr->can_ifindex = skb->dev->ifindex;
210 + error = sock_queue_rcv_skb(sk, skb);
215 +static int raw_enable_filters(struct net_device *dev, struct sock *sk,
216 + struct can_filter *filter,
222 + for (i = 0; i < count; i++) {
223 + err = can_rx_register(dev, filter[i].can_id,
224 + filter[i].can_mask,
225 + raw_rcv, sk, "raw");
227 + /* clean up successfully registered filters */
229 + can_rx_unregister(dev, filter[i].can_id,
230 + filter[i].can_mask,
239 +static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
240 + can_err_mask_t err_mask)
245 + err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
246 + raw_rcv, sk, "raw");
251 +static void raw_disable_filters(struct net_device *dev, struct sock *sk,
252 + struct can_filter *filter,
257 + for (i = 0; i < count; i++)
258 + can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
262 +static inline void raw_disable_errfilter(struct net_device *dev,
264 + can_err_mask_t err_mask)
268 + can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
272 +static inline void raw_disable_allfilters(struct net_device *dev,
275 + struct raw_sock *ro = raw_sk(sk);
277 + raw_disable_filters(dev, sk, ro->filter, ro->count);
278 + raw_disable_errfilter(dev, sk, ro->err_mask);
281 +static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
283 + struct raw_sock *ro = raw_sk(sk);
286 + err = raw_enable_filters(dev, sk, ro->filter, ro->count);
288 + err = raw_enable_errfilter(dev, sk, ro->err_mask);
290 + raw_disable_filters(dev, sk, ro->filter, ro->count);
296 +static int raw_notifier(struct notifier_block *nb,
297 + unsigned long msg, void *data)
299 + struct net_device *dev = (struct net_device *)data;
300 + struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
301 + struct sock *sk = &ro->sk;
303 + if (dev->nd_net != &init_net)
304 + return NOTIFY_DONE;
306 + if (dev->type != ARPHRD_CAN)
307 + return NOTIFY_DONE;
309 + if (ro->ifindex != dev->ifindex)
310 + return NOTIFY_DONE;
314 + case NETDEV_UNREGISTER:
316 + /* remove current filters & unregister */
318 + raw_disable_allfilters(dev, sk);
328 + sk->sk_err = ENODEV;
329 + if (!sock_flag(sk, SOCK_DEAD))
330 + sk->sk_error_report(sk);
334 + sk->sk_err = ENETDOWN;
335 + if (!sock_flag(sk, SOCK_DEAD))
336 + sk->sk_error_report(sk);
340 + return NOTIFY_DONE;
343 +static int raw_init(struct sock *sk)
345 + struct raw_sock *ro = raw_sk(sk);
350 + /* set default filter to single entry dfilter */
351 + ro->dfilter.can_id = 0;
352 + ro->dfilter.can_mask = MASK_ALL;
353 + ro->filter = &ro->dfilter;
356 + /* set default loopback behaviour */
358 + ro->recv_own_msgs = 0;
361 + ro->notifier.notifier_call = raw_notifier;
363 + register_netdevice_notifier(&ro->notifier);
368 +static int raw_release(struct socket *sock)
370 + struct sock *sk = sock->sk;
371 + struct raw_sock *ro = raw_sk(sk);
373 + unregister_netdevice_notifier(&ro->notifier);
377 + /* remove current filters & unregister */
380 + struct net_device *dev;
382 + dev = dev_get_by_index(&init_net, ro->ifindex);
384 + raw_disable_allfilters(dev, sk);
388 + raw_disable_allfilters(NULL, sk);
404 +static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
406 + struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
407 + struct sock *sk = sock->sk;
408 + struct raw_sock *ro = raw_sk(sk);
411 + int notify_enetdown = 0;
413 + if (len < sizeof(*addr))
418 + if (ro->bound && addr->can_ifindex == ro->ifindex)
421 + if (addr->can_ifindex) {
422 + struct net_device *dev;
424 + dev = dev_get_by_index(&init_net, addr->can_ifindex);
429 + if (dev->type != ARPHRD_CAN) {
434 + if (!(dev->flags & IFF_UP))
435 + notify_enetdown = 1;
437 + ifindex = dev->ifindex;
439 + /* filters set by default/setsockopt */
440 + err = raw_enable_allfilters(dev, sk);
446 + /* filters set by default/setsockopt */
447 + err = raw_enable_allfilters(NULL, sk);
452 + /* unregister old filters */
454 + struct net_device *dev;
456 + dev = dev_get_by_index(&init_net, ro->ifindex);
458 + raw_disable_allfilters(dev, sk);
462 + raw_disable_allfilters(NULL, sk);
464 + ro->ifindex = ifindex;
471 + if (notify_enetdown) {
472 + sk->sk_err = ENETDOWN;
473 + if (!sock_flag(sk, SOCK_DEAD))
474 + sk->sk_error_report(sk);
480 +static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
481 + int *len, int peer)
483 + struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
484 + struct sock *sk = sock->sk;
485 + struct raw_sock *ro = raw_sk(sk);
488 + return -EOPNOTSUPP;
490 + addr->can_family = AF_CAN;
491 + addr->can_ifindex = ro->ifindex;
493 + *len = sizeof(*addr);
498 +static int raw_setsockopt(struct socket *sock, int level, int optname,
499 + char __user *optval, int optlen)
501 + struct sock *sk = sock->sk;
502 + struct raw_sock *ro = raw_sk(sk);
503 + struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
504 + struct can_filter sfilter; /* single filter */
505 + struct net_device *dev = NULL;
506 + can_err_mask_t err_mask = 0;
510 + if (level != SOL_CAN_RAW)
517 + case CAN_RAW_FILTER:
518 + if (optlen % sizeof(struct can_filter) != 0)
521 + count = optlen / sizeof(struct can_filter);
524 + /* filter does not fit into dfilter => alloc space */
525 + filter = kmalloc(optlen, GFP_KERNEL);
529 + err = copy_from_user(filter, optval, optlen);
534 + } else if (count == 1) {
535 + err = copy_from_user(&sfilter, optval, optlen);
542 + if (ro->bound && ro->ifindex)
543 + dev = dev_get_by_index(&init_net, ro->ifindex);
546 + /* (try to) register the new filters */
548 + err = raw_enable_filters(dev, sk, &sfilter, 1);
550 + err = raw_enable_filters(dev, sk, filter,
559 + /* remove old filter registrations */
560 + raw_disable_filters(dev, sk, ro->filter, ro->count);
563 + /* remove old filter space */
567 + /* link new filters to the socket */
569 + /* copy filter data for single filter */
570 + ro->dfilter = sfilter;
571 + filter = &ro->dfilter;
573 + ro->filter = filter;
584 + case CAN_RAW_ERR_FILTER:
585 + if (optlen != sizeof(err_mask))
588 + err = copy_from_user(&err_mask, optval, optlen);
592 + err_mask &= CAN_ERR_MASK;
596 + if (ro->bound && ro->ifindex)
597 + dev = dev_get_by_index(&init_net, ro->ifindex);
599 + /* remove current error mask */
601 + /* (try to) register the new err_mask */
602 + err = raw_enable_errfilter(dev, sk, err_mask);
607 + /* remove old err_mask registration */
608 + raw_disable_errfilter(dev, sk, ro->err_mask);
611 + /* link new err_mask to the socket */
612 + ro->err_mask = err_mask;
622 + case CAN_RAW_LOOPBACK:
623 + if (optlen != sizeof(ro->loopback))
626 + err = copy_from_user(&ro->loopback, optval, optlen);
630 + case CAN_RAW_RECV_OWN_MSGS:
631 + if (optlen != sizeof(ro->recv_own_msgs))
634 + err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
639 + return -ENOPROTOOPT;
644 +static int raw_getsockopt(struct socket *sock, int level, int optname,
645 + char __user *optval, int __user *optlen)
647 + struct sock *sk = sock->sk;
648 + struct raw_sock *ro = raw_sk(sk);
653 + if (level != SOL_CAN_RAW)
655 + if (get_user(len, optlen))
662 + case CAN_RAW_FILTER:
664 + if (ro->count > 0) {
665 + int fsize = ro->count * sizeof(struct can_filter);
668 + err = copy_to_user(optval, ro->filter, len);
674 + err = put_user(len, optlen);
677 + case CAN_RAW_ERR_FILTER:
678 + if (len > sizeof(can_err_mask_t))
679 + len = sizeof(can_err_mask_t);
680 + val = &ro->err_mask;
683 + case CAN_RAW_LOOPBACK:
684 + if (len > sizeof(int))
686 + val = &ro->loopback;
689 + case CAN_RAW_RECV_OWN_MSGS:
690 + if (len > sizeof(int))
692 + val = &ro->recv_own_msgs;
696 + return -ENOPROTOOPT;
699 + if (put_user(len, optlen))
701 + if (copy_to_user(optval, val, len))
706 +static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
707 + struct msghdr *msg, size_t size)
709 + struct sock *sk = sock->sk;
710 + struct raw_sock *ro = raw_sk(sk);
711 + struct sk_buff *skb;
712 + struct net_device *dev;
716 + if (msg->msg_name) {
717 + struct sockaddr_can *addr =
718 + (struct sockaddr_can *)msg->msg_name;
720 + if (addr->can_family != AF_CAN)
723 + ifindex = addr->can_ifindex;
725 + ifindex = ro->ifindex;
727 + dev = dev_get_by_index(&init_net, ifindex);
731 + skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
738 + err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
747 + err = can_send(skb, ro->loopback);
757 +static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
758 + struct msghdr *msg, size_t size, int flags)
760 + struct sock *sk = sock->sk;
761 + struct sk_buff *skb;
765 + noblock = flags & MSG_DONTWAIT;
766 + flags &= ~MSG_DONTWAIT;
768 + skb = skb_recv_datagram(sk, flags, noblock, &error);
772 + if (size < skb->len)
773 + msg->msg_flags |= MSG_TRUNC;
777 + error = memcpy_toiovec(msg->msg_iov, skb->data, size);
779 + skb_free_datagram(sk, skb);
783 + sock_recv_timestamp(msg, sk, skb);
785 + if (msg->msg_name) {
786 + msg->msg_namelen = sizeof(struct sockaddr_can);
787 + memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
790 + skb_free_datagram(sk, skb);
795 +static struct proto_ops raw_ops __read_mostly = {
797 + .release = raw_release,
799 + .connect = sock_no_connect,
800 + .socketpair = sock_no_socketpair,
801 + .accept = sock_no_accept,
802 + .getname = raw_getname,
803 + .poll = datagram_poll,
804 + .ioctl = NULL, /* use can_ioctl() from af_can.c */
805 + .listen = sock_no_listen,
806 + .shutdown = sock_no_shutdown,
807 + .setsockopt = raw_setsockopt,
808 + .getsockopt = raw_getsockopt,
809 + .sendmsg = raw_sendmsg,
810 + .recvmsg = raw_recvmsg,
811 + .mmap = sock_no_mmap,
812 + .sendpage = sock_no_sendpage,
815 +static struct proto raw_proto __read_mostly = {
817 + .owner = THIS_MODULE,
818 + .obj_size = sizeof(struct raw_sock),
822 +static struct can_proto raw_can_proto __read_mostly = {
824 + .protocol = CAN_RAW,
827 + .prot = &raw_proto,
830 +static __init int raw_module_init(void)
836 + err = can_proto_register(&raw_can_proto);
838 + printk(KERN_ERR "can: registration of raw protocol failed\n");
843 +static __exit void raw_module_exit(void)
845 + can_proto_unregister(&raw_can_proto);
848 +module_init(raw_module_init);
849 +module_exit(raw_module_exit);