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 | 822 ++++++++++++++++++++++++++++++++++++++++++++++++
14 4 files changed, 867 insertions(+)
16 Index: net-2.6.24/include/linux/can/raw.h
17 ===================================================================
18 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
19 +++ net-2.6.24/include/linux/can/raw.h 2007-09-25 13:23:05.000000000 +0200
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-2.6.24/net/can/Kconfig
53 ===================================================================
54 --- net-2.6.24.orig/net/can/Kconfig 2007-09-25 13:14:46.000000000 +0200
55 +++ net-2.6.24/net/can/Kconfig 2007-09-25 13:31:06.000000000 +0200
57 If you want CAN support, you should say Y here and also to the
58 specific driver for your controller(s) below.
61 + tristate "Raw CAN Protocol (raw access with CAN-ID filtering)"
65 + The Raw CAN protocol option offers access to the CAN bus via
66 + the BSD socket API. You probably want to use the raw socket in
67 + most cases where no higher level protocol is being used. The raw
68 + socket has several filter options e.g. ID-Masking / Errorframes.
69 + To receive/send raw CAN messages, use AF_CAN with protocol CAN_RAW.
72 bool "CAN Core debugging messages"
74 Index: net-2.6.24/net/can/Makefile
75 ===================================================================
76 --- net-2.6.24.orig/net/can/Makefile 2007-09-25 13:14:46.000000000 +0200
77 +++ net-2.6.24/net/can/Makefile 2007-09-25 13:29:23.000000000 +0200
80 obj-$(CONFIG_CAN) += can.o
81 can-objs := af_can.o proc.o
83 +obj-$(CONFIG_CAN_RAW) += can-raw.o
84 +can-raw-objs := raw.o
85 Index: net-2.6.24/net/can/raw.c
86 ===================================================================
87 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
88 +++ net-2.6.24/net/can/raw.c 2007-09-25 13:25:24.000000000 +0200
91 + * raw.c - Raw sockets for protocol family CAN
93 + * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
94 + * All rights reserved.
96 + * Redistribution and use in source and binary forms, with or without
97 + * modification, are permitted provided that the following conditions
99 + * 1. Redistributions of source code must retain the above copyright
100 + * notice, this list of conditions, the following disclaimer and
101 + * the referenced file 'COPYING'.
102 + * 2. Redistributions in binary form must reproduce the above copyright
103 + * notice, this list of conditions and the following disclaimer in the
104 + * documentation and/or other materials provided with the distribution.
105 + * 3. Neither the name of Volkswagen nor the names of its contributors
106 + * may be used to endorse or promote products derived from this software
107 + * without specific prior written permission.
109 + * Alternatively, provided that this notice is retained in full, this
110 + * software may be distributed under the terms of the GNU General
111 + * Public License ("GPL") version 2 as distributed in the 'COPYING'
112 + * file from the main directory of the linux kernel source.
114 + * The provided data structures and external interfaces from this code
115 + * are not restricted to be used by modules with a GPL compatible license.
117 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
118 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
119 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
120 + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
121 + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
122 + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
123 + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
124 + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
125 + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
126 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
127 + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
130 + * Send feedback to <socketcan-users@lists.berlios.de>
134 +#include <linux/module.h>
135 +#include <linux/init.h>
136 +#include <linux/uio.h>
137 +#include <linux/poll.h>
138 +#include <linux/net.h>
139 +#include <linux/netdevice.h>
140 +#include <linux/socket.h>
141 +#include <linux/if_arp.h>
142 +#include <linux/skbuff.h>
143 +#include <linux/can.h>
144 +#include <linux/can/core.h>
145 +#include <linux/can/raw.h>
146 +#include <net/sock.h>
147 +#include <net/net_namespace.h>
150 +#define CAN_RAW_VERSION CAN_VERSION
151 +static __initdata const char banner[] =
152 + KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
154 +MODULE_DESCRIPTION("PF_CAN raw protocol");
155 +MODULE_LICENSE("Dual BSD/GPL");
156 +MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
158 +#ifdef CONFIG_CAN_DEBUG_CORE
160 +module_param(debug, int, S_IRUGO);
161 +MODULE_PARM_DESC(debug, "debug print mask: 1:debug, 2:frames, 4:skbs");
167 + * A raw socket has a list of can_filters attached to it, each receiving
168 + * the CAN frames matching that filter. If the filter list is empty,
169 + * no CAN frames will be received by the socket. The default after
170 + * opening the socket, is to have one filter which receives all frames.
171 + * The filter list is allocated dynamically with the exception of the
172 + * list containing only one item. This common case is optimized by
173 + * storing the single filter in dfilter, to avoid using dynamic memory.
180 + struct notifier_block notifier;
183 + int count; /* number of active filters */
184 + struct can_filter dfilter; /* default/single filter */
185 + struct can_filter *filter; /* pointer to filter(s) */
186 + can_err_mask_t err_mask;
189 +static inline struct raw_sock *raw_sk(const struct sock *sk)
191 + return (struct raw_sock *)sk;
194 +static void raw_rcv(struct sk_buff *skb, void *data)
196 + struct sock *sk = (struct sock *)data;
197 + struct raw_sock *ro = raw_sk(sk);
198 + struct sockaddr_can *addr;
201 + DBG("received skbuff %p, sk %p\n", skb, sk);
204 + if (!ro->recv_own_msgs) {
205 + /* check the received tx sock reference */
206 + if (skb->sk == sk) {
207 + DBG("trashed own tx msg\n");
214 + * Put the datagram to the queue so that raw_recvmsg() can
215 + * get it from there. We need to pass the interface index to
216 + * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
217 + * containing the interface index.
220 + BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
221 + addr = (struct sockaddr_can *)skb->cb;
222 + memset(addr, 0, sizeof(*addr));
223 + addr->can_family = AF_CAN;
224 + addr->can_ifindex = skb->dev->ifindex;
226 + error = sock_queue_rcv_skb(sk, skb);
228 + DBG("sock_queue_rcv_skb failed: %d\n", error);
229 + DBG("freeing skbuff %p\n", skb);
234 +static int raw_enable_filters(struct net_device *dev, struct sock *sk,
235 + struct can_filter *filter,
241 + for (i = 0; i < count; i++) {
242 + DBG("filter can_id %08X, can_mask %08X%s, sk %p\n",
243 + filter[i].can_id, filter[i].can_mask,
244 + filter[i].can_id & CAN_INV_FILTER ? " (inv)" : "", sk);
246 + err = can_rx_register(dev, filter[i].can_id,
247 + filter[i].can_mask,
248 + raw_rcv, sk, IDENT);
251 + /* clean up successfully registered filters */
253 + can_rx_unregister(dev, filter[i].can_id,
254 + filter[i].can_mask,
263 +static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
264 + can_err_mask_t err_mask)
269 + err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
270 + raw_rcv, sk, IDENT);
275 +static void raw_disable_filters(struct net_device *dev, struct sock *sk,
276 + struct can_filter *filter,
281 + for (i = 0; i < count; i++) {
282 + DBG("filter can_id %08X, can_mask %08X%s, sk %p\n",
283 + filter[i].can_id, filter[i].can_mask,
284 + filter[i].can_id & CAN_INV_FILTER ? " (inv)" : "", sk);
286 + can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
291 +static inline void raw_disable_errfilter(struct net_device *dev,
293 + can_err_mask_t err_mask)
297 + can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
301 +static inline void raw_disable_allfilters(struct net_device *dev,
304 + struct raw_sock *ro = raw_sk(sk);
306 + raw_disable_filters(dev, sk, ro->filter, ro->count);
307 + raw_disable_errfilter(dev, sk, ro->err_mask);
310 +static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
312 + struct raw_sock *ro = raw_sk(sk);
315 + err = raw_enable_filters(dev, sk, ro->filter, ro->count);
317 + err = raw_enable_errfilter(dev, sk, ro->err_mask);
319 + raw_disable_filters(dev, sk, ro->filter, ro->count);
325 +static int raw_notifier(struct notifier_block *nb,
326 + unsigned long msg, void *data)
328 + struct net_device *dev = (struct net_device *)data;
329 + struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
330 + struct sock *sk = &ro->sk;
332 + DBG("msg %ld for dev %p (%s idx %d) sk %p ro->ifindex %d\n",
333 + msg, dev, dev->name, dev->ifindex, sk, ro->ifindex);
335 + if (dev->nd_net != &init_net)
336 + return NOTIFY_DONE;
338 + if (dev->type != ARPHRD_CAN)
339 + return NOTIFY_DONE;
341 + if (ro->ifindex != dev->ifindex)
342 + return NOTIFY_DONE;
346 + case NETDEV_UNREGISTER:
348 + /* remove current filters & unregister */
350 + raw_disable_allfilters(dev, sk);
360 + sk->sk_err = ENODEV;
361 + if (!sock_flag(sk, SOCK_DEAD))
362 + sk->sk_error_report(sk);
366 + sk->sk_err = ENETDOWN;
367 + if (!sock_flag(sk, SOCK_DEAD))
368 + sk->sk_error_report(sk);
372 + return NOTIFY_DONE;
375 +static int raw_init(struct sock *sk)
377 + struct raw_sock *ro = raw_sk(sk);
382 + /* set default filter to single entry dfilter */
383 + ro->dfilter.can_id = 0;
384 + ro->dfilter.can_mask = MASK_ALL;
385 + ro->filter = &ro->dfilter;
388 + /* set default loopback behaviour */
390 + ro->recv_own_msgs = 0;
393 + ro->notifier.notifier_call = raw_notifier;
395 + register_netdevice_notifier(&ro->notifier);
400 +static int raw_release(struct socket *sock)
402 + struct sock *sk = sock->sk;
403 + struct raw_sock *ro = raw_sk(sk);
405 + DBG("socket %p, sk %p, refcnt %d\n", sock, sk,
406 + atomic_read(&sk->sk_refcnt));
408 + unregister_netdevice_notifier(&ro->notifier);
412 + /* remove current filters & unregister */
415 + struct net_device *dev;
417 + dev = dev_get_by_index(&init_net, ro->ifindex);
419 + raw_disable_allfilters(dev, sk);
423 + raw_disable_allfilters(NULL, sk);
439 +static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
441 + struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
442 + struct sock *sk = sock->sk;
443 + struct raw_sock *ro = raw_sk(sk);
446 + int notify_enetdown = 0;
448 + DBG("socket %p to device %d\n", sock, addr->can_ifindex);
450 + if (len < sizeof(*addr))
455 + if (ro->bound && addr->can_ifindex == ro->ifindex)
458 + if (addr->can_ifindex) {
459 + struct net_device *dev;
461 + dev = dev_get_by_index(&init_net, addr->can_ifindex);
463 + DBG("could not find device %d\n", addr->can_ifindex);
467 + if (dev->type != ARPHRD_CAN) {
468 + DBG("device %d no CAN device\n", addr->can_ifindex);
473 + if (!(dev->flags & IFF_UP))
474 + notify_enetdown = 1;
476 + ifindex = dev->ifindex;
478 + /* filters set by default/setsockopt */
479 + err = raw_enable_allfilters(dev, sk);
485 + /* filters set by default/setsockopt */
486 + err = raw_enable_allfilters(NULL, sk);
491 + /* unregister old filters */
493 + struct net_device *dev;
495 + dev = dev_get_by_index(&init_net, ro->ifindex);
497 + raw_disable_allfilters(dev, sk);
501 + raw_disable_allfilters(NULL, sk);
503 + ro->ifindex = ifindex;
510 + if (notify_enetdown) {
511 + sk->sk_err = ENETDOWN;
512 + if (!sock_flag(sk, SOCK_DEAD))
513 + sk->sk_error_report(sk);
519 +static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
520 + int *len, int peer)
522 + struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
523 + struct sock *sk = sock->sk;
524 + struct raw_sock *ro = raw_sk(sk);
527 + return -EOPNOTSUPP;
529 + addr->can_family = AF_CAN;
530 + addr->can_ifindex = ro->ifindex;
532 + *len = sizeof(*addr);
537 +static unsigned int raw_poll(struct file *file, struct socket *sock,
540 + unsigned int mask = 0;
542 + DBG("socket %p\n", sock);
544 + mask = datagram_poll(file, sock, wait);
548 +static int raw_setsockopt(struct socket *sock, int level, int optname,
549 + char __user *optval, int optlen)
551 + struct sock *sk = sock->sk;
552 + struct raw_sock *ro = raw_sk(sk);
553 + struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
554 + struct can_filter sfilter; /* single filter */
555 + struct net_device *dev = NULL;
556 + can_err_mask_t err_mask = 0;
560 + if (level != SOL_CAN_RAW)
567 + case CAN_RAW_FILTER:
568 + if (optlen % sizeof(struct can_filter) != 0)
571 + count = optlen / sizeof(struct can_filter);
574 + /* filter does not fit into dfilter => alloc space */
575 + filter = kmalloc(optlen, GFP_KERNEL);
579 + err = copy_from_user(filter, optval, optlen);
584 + } else if (count == 1) {
585 + err = copy_from_user(&sfilter, optval, optlen);
592 + if (ro->bound && ro->ifindex)
593 + dev = dev_get_by_index(&init_net, ro->ifindex);
596 + /* (try to) register the new filters */
598 + err = raw_enable_filters(dev, sk, &sfilter, 1);
600 + err = raw_enable_filters(dev, sk, filter,
609 + /* remove old filter registrations */
610 + raw_disable_filters(dev, sk, ro->filter, ro->count);
613 + /* remove old filter space */
617 + /* link new filters to the socket */
619 + /* copy filter data for single filter */
620 + ro->dfilter = sfilter;
621 + filter = &ro->dfilter;
623 + ro->filter = filter;
634 + case CAN_RAW_ERR_FILTER:
635 + if (optlen != sizeof(err_mask))
638 + err = copy_from_user(&err_mask, optval, optlen);
642 + err_mask &= CAN_ERR_MASK;
646 + if (ro->bound && ro->ifindex)
647 + dev = dev_get_by_index(&init_net, ro->ifindex);
649 + /* remove current error mask */
651 + /* (try to) register the new err_mask */
652 + err = raw_enable_errfilter(dev, sk, err_mask);
657 + /* remove old err_mask registration */
658 + raw_disable_errfilter(dev, sk, ro->err_mask);
661 + /* link new err_mask to the socket */
662 + ro->err_mask = err_mask;
672 + case CAN_RAW_LOOPBACK:
673 + if (optlen != sizeof(ro->loopback))
676 + err = copy_from_user(&ro->loopback, optval, optlen);
680 + case CAN_RAW_RECV_OWN_MSGS:
681 + if (optlen != sizeof(ro->recv_own_msgs))
684 + err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
689 + return -ENOPROTOOPT;
694 +static int raw_getsockopt(struct socket *sock, int level, int optname,
695 + char __user *optval, int __user *optlen)
697 + struct sock *sk = sock->sk;
698 + struct raw_sock *ro = raw_sk(sk);
703 + if (level != SOL_CAN_RAW)
705 + if (get_user(len, optlen))
712 + case CAN_RAW_FILTER:
714 + if (ro->count > 0) {
715 + int fsize = ro->count * sizeof(struct can_filter);
718 + err = copy_to_user(optval, ro->filter, len);
724 + err = put_user(len, optlen);
727 + case CAN_RAW_ERR_FILTER:
728 + if (len > sizeof(can_err_mask_t))
729 + len = sizeof(can_err_mask_t);
730 + val = &ro->err_mask;
733 + case CAN_RAW_LOOPBACK:
734 + if (len > sizeof(int))
736 + val = &ro->loopback;
739 + case CAN_RAW_RECV_OWN_MSGS:
740 + if (len > sizeof(int))
742 + val = &ro->recv_own_msgs;
746 + return -ENOPROTOOPT;
749 + if (put_user(len, optlen))
751 + if (copy_to_user(optval, val, len))
756 +static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
757 + struct msghdr *msg, size_t size)
759 + struct sock *sk = sock->sk;
760 + struct raw_sock *ro = raw_sk(sk);
761 + struct sk_buff *skb;
762 + struct net_device *dev;
766 + DBG("socket %p, sk %p\n", sock, sk);
768 + if (msg->msg_name) {
769 + struct sockaddr_can *addr =
770 + (struct sockaddr_can *)msg->msg_name;
772 + if (addr->can_family != AF_CAN)
775 + ifindex = addr->can_ifindex;
777 + ifindex = ro->ifindex;
779 + dev = dev_get_by_index(&init_net, ifindex);
781 + DBG("device %d not found\n", ifindex);
785 + skb = alloc_skb(size, GFP_KERNEL);
791 + err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
800 + DBG("sending skbuff to interface %d\n", ifindex);
803 + err = can_send(skb, ro->loopback);
813 +static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
814 + struct msghdr *msg, size_t size, int flags)
816 + struct sock *sk = sock->sk;
817 + struct sk_buff *skb;
821 + DBG("socket %p, sk %p\n", sock, sk);
823 + noblock = flags & MSG_DONTWAIT;
824 + flags &= ~MSG_DONTWAIT;
826 + skb = skb_recv_datagram(sk, flags, noblock, &error);
830 + DBG("delivering skbuff %p\n", skb);
833 + if (size < skb->len)
834 + msg->msg_flags |= MSG_TRUNC;
838 + error = memcpy_toiovec(msg->msg_iov, skb->data, size);
840 + skb_free_datagram(sk, skb);
844 + sock_recv_timestamp(msg, sk, skb);
846 + if (msg->msg_name) {
847 + msg->msg_namelen = sizeof(struct sockaddr_can);
848 + memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
851 + DBG("freeing sock %p, skbuff %p\n", sk, skb);
852 + skb_free_datagram(sk, skb);
857 +static struct proto_ops raw_ops __read_mostly = {
859 + .release = raw_release,
861 + .connect = sock_no_connect,
862 + .socketpair = sock_no_socketpair,
863 + .accept = sock_no_accept,
864 + .getname = raw_getname,
866 + .ioctl = NULL, /* use can_ioctl() from af_can.c */
867 + .listen = sock_no_listen,
868 + .shutdown = sock_no_shutdown,
869 + .setsockopt = raw_setsockopt,
870 + .getsockopt = raw_getsockopt,
871 + .sendmsg = raw_sendmsg,
872 + .recvmsg = raw_recvmsg,
873 + .mmap = sock_no_mmap,
874 + .sendpage = sock_no_sendpage,
877 +static struct proto raw_proto __read_mostly = {
879 + .owner = THIS_MODULE,
880 + .obj_size = sizeof(struct raw_sock),
884 +static struct can_proto raw_can_proto __read_mostly = {
886 + .protocol = CAN_RAW,
889 + .prot = &raw_proto,
892 +static __init int raw_module_init(void)
898 + err = can_proto_register(&raw_can_proto);
900 + printk(KERN_ERR "can: registration of raw protocol failed\n");
905 +static __exit void raw_module_exit(void)
907 + can_proto_unregister(&raw_can_proto);
910 +module_init(raw_module_init);
911 +module_exit(raw_module_exit);