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 | 810 ++++++++++++++++++++++++++++++++++++++++++++++++
14 4 files changed, 855 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 2007-10-05 11:11:41.000000000 +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 2007-10-05 11:11:04.000000000 +0200
55 +++ net-2.6.24/net/can/Kconfig 2007-10-05 11:12:35.000000000 +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 / error frames.
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 2007-10-05 11:08:05.000000000 +0200
77 +++ net-2.6.24/net/can/Makefile 2007-10-05 11:11:41.000000000 +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 2007-10-05 11:11:41.000000000 +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 and the following disclaimer.
101 + * 2. Redistributions in binary form must reproduce the above copyright
102 + * notice, this list of conditions and the following disclaimer in the
103 + * documentation and/or other materials provided with the distribution.
104 + * 3. Neither the name of Volkswagen nor the names of its contributors
105 + * may be used to endorse or promote products derived from this software
106 + * without specific prior written permission.
108 + * Alternatively, provided that this notice is retained in full, this
109 + * software may be distributed under the terms of the GNU General
110 + * Public License ("GPL") version 2, in which case the provisions of the
111 + * GPL apply INSTEAD OF those given above.
113 + * The provided data structures and external interfaces from this code
114 + * are not restricted to be used by modules with a GPL compatible license.
116 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
117 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
118 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
119 + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
120 + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
121 + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
122 + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
123 + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
124 + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
125 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
126 + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
129 + * Send feedback to <socketcan-users@lists.berlios.de>
133 +#include <linux/module.h>
134 +#include <linux/init.h>
135 +#include <linux/uio.h>
136 +#include <linux/net.h>
137 +#include <linux/netdevice.h>
138 +#include <linux/socket.h>
139 +#include <linux/if_arp.h>
140 +#include <linux/skbuff.h>
141 +#include <linux/can.h>
142 +#include <linux/can/core.h>
143 +#include <linux/can/raw.h>
144 +#include <net/sock.h>
145 +#include <net/net_namespace.h>
147 +#define CAN_RAW_VERSION CAN_VERSION
148 +static __initdata const char banner[] =
149 + KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
151 +MODULE_DESCRIPTION("PF_CAN raw protocol");
152 +MODULE_LICENSE("Dual BSD/GPL");
153 +MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
155 +#ifdef CONFIG_CAN_DEBUG_CORE
156 +#define DBG_PREFIX "can-raw"
157 +#define DBG_VAR raw_debug
158 +static int raw_debug;
159 +module_param_named(debug, raw_debug, int, S_IRUGO);
160 +MODULE_PARM_DESC(debug, "debug print mask: 1:debug, 2:frames, 4:skbs");
166 + * A raw socket has a list of can_filters attached to it, each receiving
167 + * the CAN frames matching that filter. If the filter list is empty,
168 + * no CAN frames will be received by the socket. The default after
169 + * opening the socket, is to have one filter which receives all frames.
170 + * The filter list is allocated dynamically with the exception of the
171 + * list containing only one item. This common case is optimized by
172 + * storing the single filter in dfilter, to avoid using dynamic memory.
179 + struct notifier_block notifier;
182 + int count; /* number of active filters */
183 + struct can_filter dfilter; /* default/single filter */
184 + struct can_filter *filter; /* pointer to filter(s) */
185 + can_err_mask_t err_mask;
188 +static inline struct raw_sock *raw_sk(const struct sock *sk)
190 + return (struct raw_sock *)sk;
193 +static void raw_rcv(struct sk_buff *skb, void *data)
195 + struct sock *sk = (struct sock *)data;
196 + struct raw_sock *ro = raw_sk(sk);
197 + struct sockaddr_can *addr;
200 + DBG("received skbuff %p, sk %p\n", skb, sk);
203 + if (!ro->recv_own_msgs) {
204 + /* check the received tx sock reference */
205 + if (skb->sk == sk) {
206 + DBG("trashed own tx msg\n");
213 + * Put the datagram to the queue so that raw_recvmsg() can
214 + * get it from there. We need to pass the interface index to
215 + * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
216 + * containing the interface index.
219 + BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
220 + addr = (struct sockaddr_can *)skb->cb;
221 + memset(addr, 0, sizeof(*addr));
222 + addr->can_family = AF_CAN;
223 + addr->can_ifindex = skb->dev->ifindex;
225 + error = sock_queue_rcv_skb(sk, skb);
227 + DBG("sock_queue_rcv_skb failed: %d\n", error);
228 + DBG("freeing skbuff %p\n", skb);
233 +static int raw_enable_filters(struct net_device *dev, struct sock *sk,
234 + struct can_filter *filter,
240 + for (i = 0; i < count; i++) {
241 + DBG("filter can_id %08X, can_mask %08X%s, sk %p\n",
242 + filter[i].can_id, filter[i].can_mask,
243 + filter[i].can_id & CAN_INV_FILTER ? " (inv)" : "", sk);
245 + err = can_rx_register(dev, filter[i].can_id,
246 + filter[i].can_mask,
247 + raw_rcv, sk, "raw");
250 + /* clean up successfully registered filters */
252 + can_rx_unregister(dev, filter[i].can_id,
253 + filter[i].can_mask,
262 +static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
263 + can_err_mask_t err_mask)
268 + err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
269 + raw_rcv, sk, "raw");
274 +static void raw_disable_filters(struct net_device *dev, struct sock *sk,
275 + struct can_filter *filter,
280 + for (i = 0; i < count; i++) {
281 + DBG("filter can_id %08X, can_mask %08X%s, sk %p\n",
282 + filter[i].can_id, filter[i].can_mask,
283 + filter[i].can_id & CAN_INV_FILTER ? " (inv)" : "", sk);
285 + can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
290 +static inline void raw_disable_errfilter(struct net_device *dev,
292 + can_err_mask_t err_mask)
296 + can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
300 +static inline void raw_disable_allfilters(struct net_device *dev,
303 + struct raw_sock *ro = raw_sk(sk);
305 + raw_disable_filters(dev, sk, ro->filter, ro->count);
306 + raw_disable_errfilter(dev, sk, ro->err_mask);
309 +static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
311 + struct raw_sock *ro = raw_sk(sk);
314 + err = raw_enable_filters(dev, sk, ro->filter, ro->count);
316 + err = raw_enable_errfilter(dev, sk, ro->err_mask);
318 + raw_disable_filters(dev, sk, ro->filter, ro->count);
324 +static int raw_notifier(struct notifier_block *nb,
325 + unsigned long msg, void *data)
327 + struct net_device *dev = (struct net_device *)data;
328 + struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
329 + struct sock *sk = &ro->sk;
331 + DBG("msg %ld for dev %p (%s idx %d) sk %p ro->ifindex %d\n",
332 + msg, dev, dev->name, dev->ifindex, sk, ro->ifindex);
334 + if (dev->nd_net != &init_net)
335 + return NOTIFY_DONE;
337 + if (dev->type != ARPHRD_CAN)
338 + return NOTIFY_DONE;
340 + if (ro->ifindex != dev->ifindex)
341 + return NOTIFY_DONE;
345 + case NETDEV_UNREGISTER:
347 + /* remove current filters & unregister */
349 + raw_disable_allfilters(dev, sk);
359 + sk->sk_err = ENODEV;
360 + if (!sock_flag(sk, SOCK_DEAD))
361 + sk->sk_error_report(sk);
365 + sk->sk_err = ENETDOWN;
366 + if (!sock_flag(sk, SOCK_DEAD))
367 + sk->sk_error_report(sk);
371 + return NOTIFY_DONE;
374 +static int raw_init(struct sock *sk)
376 + struct raw_sock *ro = raw_sk(sk);
381 + /* set default filter to single entry dfilter */
382 + ro->dfilter.can_id = 0;
383 + ro->dfilter.can_mask = MASK_ALL;
384 + ro->filter = &ro->dfilter;
387 + /* set default loopback behaviour */
389 + ro->recv_own_msgs = 0;
392 + ro->notifier.notifier_call = raw_notifier;
394 + register_netdevice_notifier(&ro->notifier);
399 +static int raw_release(struct socket *sock)
401 + struct sock *sk = sock->sk;
402 + struct raw_sock *ro = raw_sk(sk);
404 + DBG("socket %p, sk %p, refcnt %d\n", sock, sk,
405 + atomic_read(&sk->sk_refcnt));
407 + unregister_netdevice_notifier(&ro->notifier);
411 + /* remove current filters & unregister */
414 + struct net_device *dev;
416 + dev = dev_get_by_index(&init_net, ro->ifindex);
418 + raw_disable_allfilters(dev, sk);
422 + raw_disable_allfilters(NULL, sk);
438 +static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
440 + struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
441 + struct sock *sk = sock->sk;
442 + struct raw_sock *ro = raw_sk(sk);
445 + int notify_enetdown = 0;
447 + DBG("socket %p to device %d\n", sock, addr->can_ifindex);
449 + if (len < sizeof(*addr))
454 + if (ro->bound && addr->can_ifindex == ro->ifindex)
457 + if (addr->can_ifindex) {
458 + struct net_device *dev;
460 + dev = dev_get_by_index(&init_net, addr->can_ifindex);
462 + DBG("could not find device %d\n", addr->can_ifindex);
466 + if (dev->type != ARPHRD_CAN) {
467 + DBG("device %d no CAN device\n", addr->can_ifindex);
472 + if (!(dev->flags & IFF_UP))
473 + notify_enetdown = 1;
475 + ifindex = dev->ifindex;
477 + /* filters set by default/setsockopt */
478 + err = raw_enable_allfilters(dev, sk);
484 + /* filters set by default/setsockopt */
485 + err = raw_enable_allfilters(NULL, sk);
490 + /* unregister old filters */
492 + struct net_device *dev;
494 + dev = dev_get_by_index(&init_net, ro->ifindex);
496 + raw_disable_allfilters(dev, sk);
500 + raw_disable_allfilters(NULL, sk);
502 + ro->ifindex = ifindex;
509 + if (notify_enetdown) {
510 + sk->sk_err = ENETDOWN;
511 + if (!sock_flag(sk, SOCK_DEAD))
512 + sk->sk_error_report(sk);
518 +static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
519 + int *len, int peer)
521 + struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
522 + struct sock *sk = sock->sk;
523 + struct raw_sock *ro = raw_sk(sk);
526 + return -EOPNOTSUPP;
528 + addr->can_family = AF_CAN;
529 + addr->can_ifindex = ro->ifindex;
531 + *len = sizeof(*addr);
536 +static int raw_setsockopt(struct socket *sock, int level, int optname,
537 + char __user *optval, int optlen)
539 + struct sock *sk = sock->sk;
540 + struct raw_sock *ro = raw_sk(sk);
541 + struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
542 + struct can_filter sfilter; /* single filter */
543 + struct net_device *dev = NULL;
544 + can_err_mask_t err_mask = 0;
548 + if (level != SOL_CAN_RAW)
555 + case CAN_RAW_FILTER:
556 + if (optlen % sizeof(struct can_filter) != 0)
559 + count = optlen / sizeof(struct can_filter);
562 + /* filter does not fit into dfilter => alloc space */
563 + filter = kmalloc(optlen, GFP_KERNEL);
567 + err = copy_from_user(filter, optval, optlen);
572 + } else if (count == 1) {
573 + err = copy_from_user(&sfilter, optval, optlen);
580 + if (ro->bound && ro->ifindex)
581 + dev = dev_get_by_index(&init_net, ro->ifindex);
584 + /* (try to) register the new filters */
586 + err = raw_enable_filters(dev, sk, &sfilter, 1);
588 + err = raw_enable_filters(dev, sk, filter,
597 + /* remove old filter registrations */
598 + raw_disable_filters(dev, sk, ro->filter, ro->count);
601 + /* remove old filter space */
605 + /* link new filters to the socket */
607 + /* copy filter data for single filter */
608 + ro->dfilter = sfilter;
609 + filter = &ro->dfilter;
611 + ro->filter = filter;
622 + case CAN_RAW_ERR_FILTER:
623 + if (optlen != sizeof(err_mask))
626 + err = copy_from_user(&err_mask, optval, optlen);
630 + err_mask &= CAN_ERR_MASK;
634 + if (ro->bound && ro->ifindex)
635 + dev = dev_get_by_index(&init_net, ro->ifindex);
637 + /* remove current error mask */
639 + /* (try to) register the new err_mask */
640 + err = raw_enable_errfilter(dev, sk, err_mask);
645 + /* remove old err_mask registration */
646 + raw_disable_errfilter(dev, sk, ro->err_mask);
649 + /* link new err_mask to the socket */
650 + ro->err_mask = err_mask;
660 + case CAN_RAW_LOOPBACK:
661 + if (optlen != sizeof(ro->loopback))
664 + err = copy_from_user(&ro->loopback, optval, optlen);
668 + case CAN_RAW_RECV_OWN_MSGS:
669 + if (optlen != sizeof(ro->recv_own_msgs))
672 + err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
677 + return -ENOPROTOOPT;
682 +static int raw_getsockopt(struct socket *sock, int level, int optname,
683 + char __user *optval, int __user *optlen)
685 + struct sock *sk = sock->sk;
686 + struct raw_sock *ro = raw_sk(sk);
691 + if (level != SOL_CAN_RAW)
693 + if (get_user(len, optlen))
700 + case CAN_RAW_FILTER:
702 + if (ro->count > 0) {
703 + int fsize = ro->count * sizeof(struct can_filter);
706 + err = copy_to_user(optval, ro->filter, len);
712 + err = put_user(len, optlen);
715 + case CAN_RAW_ERR_FILTER:
716 + if (len > sizeof(can_err_mask_t))
717 + len = sizeof(can_err_mask_t);
718 + val = &ro->err_mask;
721 + case CAN_RAW_LOOPBACK:
722 + if (len > sizeof(int))
724 + val = &ro->loopback;
727 + case CAN_RAW_RECV_OWN_MSGS:
728 + if (len > sizeof(int))
730 + val = &ro->recv_own_msgs;
734 + return -ENOPROTOOPT;
737 + if (put_user(len, optlen))
739 + if (copy_to_user(optval, val, len))
744 +static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
745 + struct msghdr *msg, size_t size)
747 + struct sock *sk = sock->sk;
748 + struct raw_sock *ro = raw_sk(sk);
749 + struct sk_buff *skb;
750 + struct net_device *dev;
754 + DBG("socket %p, sk %p\n", sock, sk);
756 + if (msg->msg_name) {
757 + struct sockaddr_can *addr =
758 + (struct sockaddr_can *)msg->msg_name;
760 + if (addr->can_family != AF_CAN)
763 + ifindex = addr->can_ifindex;
765 + ifindex = ro->ifindex;
767 + dev = dev_get_by_index(&init_net, ifindex);
769 + DBG("device %d not found\n", ifindex);
773 + skb = alloc_skb(size, GFP_KERNEL);
779 + err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
788 + DBG("sending skbuff to interface %d\n", ifindex);
791 + err = can_send(skb, ro->loopback);
801 +static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
802 + struct msghdr *msg, size_t size, int flags)
804 + struct sock *sk = sock->sk;
805 + struct sk_buff *skb;
809 + DBG("socket %p, sk %p\n", sock, sk);
811 + noblock = flags & MSG_DONTWAIT;
812 + flags &= ~MSG_DONTWAIT;
814 + skb = skb_recv_datagram(sk, flags, noblock, &error);
818 + DBG("delivering skbuff %p\n", skb);
821 + if (size < skb->len)
822 + msg->msg_flags |= MSG_TRUNC;
826 + error = memcpy_toiovec(msg->msg_iov, skb->data, size);
828 + skb_free_datagram(sk, skb);
832 + sock_recv_timestamp(msg, sk, skb);
834 + if (msg->msg_name) {
835 + msg->msg_namelen = sizeof(struct sockaddr_can);
836 + memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
839 + DBG("freeing sock %p, skbuff %p\n", sk, skb);
840 + skb_free_datagram(sk, skb);
845 +static struct proto_ops raw_ops __read_mostly = {
847 + .release = raw_release,
849 + .connect = sock_no_connect,
850 + .socketpair = sock_no_socketpair,
851 + .accept = sock_no_accept,
852 + .getname = raw_getname,
853 + .poll = datagram_poll,
854 + .ioctl = NULL, /* use can_ioctl() from af_can.c */
855 + .listen = sock_no_listen,
856 + .shutdown = sock_no_shutdown,
857 + .setsockopt = raw_setsockopt,
858 + .getsockopt = raw_getsockopt,
859 + .sendmsg = raw_sendmsg,
860 + .recvmsg = raw_recvmsg,
861 + .mmap = sock_no_mmap,
862 + .sendpage = sock_no_sendpage,
865 +static struct proto raw_proto __read_mostly = {
867 + .owner = THIS_MODULE,
868 + .obj_size = sizeof(struct raw_sock),
872 +static struct can_proto raw_can_proto __read_mostly = {
874 + .protocol = CAN_RAW,
877 + .prot = &raw_proto,
880 +static __init int raw_module_init(void)
886 + err = can_proto_register(&raw_can_proto);
888 + printk(KERN_ERR "can: registration of raw protocol failed\n");
893 +static __exit void raw_module_exit(void)
895 + can_proto_unregister(&raw_can_proto);
898 +module_init(raw_module_init);
899 +module_exit(raw_module_exit);