4 * Copyright (c) 2002-2005 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, the following disclaimer and
12 * the referenced file 'COPYING'.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of Volkswagen nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * Alternatively, provided that this notice is retained in full, this
21 * software may be distributed under the terms of the GNU General
22 * Public License ("GPL") version 2 as distributed in the 'COPYING'
23 * file from the main directory of the linux kernel source.
25 * The provided data structures and external interfaces from this code
26 * are not restricted to be used by modules with a GPL compatible license.
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
41 * Send feedback to <llcf@volkswagen.de>
45 #include <linux/module.h>
46 #include <linux/version.h>
47 #include <linux/init.h>
48 #include <linux/net.h>
49 #include <linux/netdevice.h>
50 #include <linux/uio.h>
51 #include <linux/poll.h>
54 #include <linux/can/af_can.h>
55 #include <linux/can/raw.h>
62 #define NAME "RAW sockets for LLCF"
64 static __initdata const char banner[] = BANNER(NAME);
66 MODULE_DESCRIPTION(NAME);
67 MODULE_LICENSE("Dual BSD/GPL");
68 MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
72 module_param(debug, int, S_IRUGO);
73 #define DBG(args...) (debug & 1 ? \
74 (printk(KERN_DEBUG "RAW %s: ", __func__), \
76 #define DBG_SKB(skb) (debug & 4 ? can_debug_skb(skb) : 0)
82 static int raw_release(struct socket *sock);
83 static int raw_bind (struct socket *sock, struct sockaddr *uaddr, int len);
84 static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
86 static unsigned int raw_poll(struct file *file, struct socket *sock,
88 static int raw_setsockopt(struct socket *sock, int level, int optname,
89 char *optval, int optlen);
90 static int raw_getsockopt(struct socket *sock, int level, int optname,
91 char *optval, int *optlen);
92 static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
93 struct msghdr *msg, size_t size);
94 static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
95 struct msghdr *msg, size_t size, int flags);
96 static void raw_rcv(struct sk_buff *skb, void *data);
97 static void raw_notifier(unsigned long msg, void *data);
99 static void raw_add_filters(struct net_device *dev, struct sock *sk);
100 static void raw_remove_filters(struct net_device *dev, struct sock *sk);
103 static struct proto_ops raw_ops = {
105 .release = raw_release,
107 .connect = sock_no_connect,
108 .socketpair = sock_no_socketpair,
109 .accept = sock_no_accept,
110 .getname = raw_getname,
113 .listen = sock_no_listen,
114 .shutdown = sock_no_shutdown,
115 .setsockopt = raw_setsockopt,
116 .getsockopt = raw_getsockopt,
117 .sendmsg = raw_sendmsg,
118 .recvmsg = raw_recvmsg,
119 .mmap = sock_no_mmap,
120 .sendpage = sock_no_sendpage,
128 struct can_filter *filter;
131 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
138 #define canraw_sk(sk) (&((struct raw_sock *)(sk))->opt)
140 static struct proto raw_proto = {
142 .owner = THIS_MODULE,
143 .obj_size = sizeof(struct raw_sock),
146 static struct can_proto raw_can_proto = {
153 #define canraw_sk(sk) ((struct raw_opt *)(sk)->sk_protinfo)
155 static struct can_proto raw_can_proto = {
157 .owner = THIS_MODULE,
158 .obj_size = sizeof(struct raw_opt),
164 static __init int raw_init(void)
168 can_proto_register(CAN_RAW, &raw_can_proto);
172 static __exit void raw_exit(void)
174 can_proto_unregister(CAN_RAW);
177 static int raw_release(struct socket *sock)
179 struct sock *sk = sock->sk;
180 struct net_device *dev = NULL;
182 DBG("socket %p, sk %p, refcnt %d\n", sock, sk,
183 atomic_read(&sk->sk_refcnt));
185 if (canraw_sk(sk)->bound && canraw_sk(sk)->ifindex)
186 dev = dev_get_by_index(canraw_sk(sk)->ifindex);
188 /* remove current filters & unregister */
189 if (canraw_sk(sk)->count > 0) {
190 if (canraw_sk(sk)->bound)
191 raw_remove_filters(dev, sk);
192 kfree(canraw_sk(sk)->filter);
193 } else if (canraw_sk(sk)->bound)
194 can_rx_unregister(dev, 0, 0, raw_rcv, sk);
197 can_dev_unregister(dev, raw_notifier, sk);
206 static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
208 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
209 struct sock *sk = sock->sk;
210 struct net_device *dev;
212 DBG("socket %p to device %d\n", sock, addr->can_ifindex);
214 if (len < sizeof(*addr))
217 if (canraw_sk(sk)->bound) {
221 /* remove current bindings */
222 if (canraw_sk(sk)->ifindex) {
223 dev = dev_get_by_index(canraw_sk(sk)->ifindex);
224 ; /* remove notifier */
227 if (canraw_sk(sk)->count > 0) {
228 raw_remove_filters(sk);
230 can_rx_unregister(dev, 0, 0, raw_rcv, sk);
234 canraw_sk(sk)->bound = 0;
238 if (addr->can_ifindex) {
239 dev = dev_get_by_index(addr->can_ifindex);
241 DBG("could not find device %d\n", addr->can_ifindex);
244 if (!(dev->flags & IFF_UP)) {
245 sk->sk_err = ENETDOWN;
246 sk->sk_error_report(sk);
249 can_dev_register(dev, raw_notifier, sk);
253 canraw_sk(sk)->ifindex = addr->can_ifindex;
255 if (canraw_sk(sk)->count > 0) /* filters set by setsockopt */
256 raw_add_filters(dev, sk);
258 can_rx_register(dev, 0, 0, raw_rcv, sk, IDENT);
260 canraw_sk(sk)->bound = 1;
269 static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
272 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
273 struct sock *sk = sock->sk;
278 addr->can_family = AF_CAN;
279 addr->can_ifindex = canraw_sk(sk)->ifindex;
280 *len = sizeof(*addr);
285 static unsigned int raw_poll(struct file *file, struct socket *sock,
288 unsigned int mask = 0;
290 DBG("socket %p\n", sock);
292 mask = datagram_poll(file, sock, wait);
296 static int raw_setsockopt(struct socket *sock, int level, int optname,
297 char *optval, int optlen)
299 struct sock *sk = sock->sk;
300 struct can_filter *filter = NULL;
301 struct net_device *dev = NULL;
305 if (level != SOL_CAN_RAW)
311 if (optlen % sizeof(struct can_filter) != 0)
313 if (!(filter = kmalloc(optlen, GFP_KERNEL)))
315 if (err = copy_from_user(filter, optval, optlen)) {
319 count = optlen / sizeof(struct can_filter);
322 if (canraw_sk(sk)->bound && canraw_sk(sk)->ifindex)
323 dev = dev_get_by_index(canraw_sk(sk)->ifindex);
325 /* remove current filters & unregister */
326 if (canraw_sk(sk)->count > 0) {
328 if (canraw_sk(sk)->bound)
329 raw_remove_filters(dev, sk);
331 kfree(canraw_sk(sk)->filter);
332 canraw_sk(sk)->count = 0;
333 canraw_sk(sk)->filter = NULL;
334 } else if (canraw_sk(sk)->bound)
335 can_rx_unregister(dev, 0, 0, raw_rcv, sk);
337 /* add new filters & register */
339 canraw_sk(sk)->filter = filter;
340 canraw_sk(sk)->count = count;
341 if (canraw_sk(sk)->bound)
342 raw_add_filters(dev, sk);
343 } else if (canraw_sk(sk)->bound)
344 can_rx_register(dev, 0, 0, raw_rcv, sk, IDENT);
357 static int raw_getsockopt(struct socket *sock, int level, int optname,
358 char *optval, int *optlen)
360 struct sock *sk = sock->sk;
361 struct can_filter *filter = canraw_sk(sk)->filter;
364 if (level != SOL_CAN_RAW)
369 if (get_user(len, optlen))
373 int filter_size = canraw_sk(sk)->count * sizeof(struct can_filter);
374 if (len < filter_size)
376 if (len > filter_size)
378 if (copy_to_user(optval, filter, len))
382 if (put_user(len, optlen))
392 static void raw_add_filters(struct net_device *dev, struct sock *sk)
394 struct can_filter *filter = canraw_sk(sk)->filter;
397 for (i = 0; i < canraw_sk(sk)->count; i++) {
398 can_rx_register(dev, filter[i].can_id, filter[i].can_mask,
400 DBG("filter can_id %08X, can_mask %08X%s, sk %p\n",
401 filter[i].can_id, filter[i].can_mask,
402 filter[i].can_id & CAN_INV_FILTER ? " (inv)" : "", sk);
406 static void raw_remove_filters(struct net_device *dev, struct sock *sk)
408 struct can_filter *filter = canraw_sk(sk)->filter;
411 for (i = 0; i < canraw_sk(sk)->count; i++) {
412 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
414 DBG("filter can_id %08X, can_mask %08X%s, sk %p\n",
415 filter[i].can_id, filter[i].can_mask,
416 filter[i].can_id & CAN_INV_FILTER ? " (inv)" : "", sk);
420 static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
421 struct msghdr *msg, size_t size)
423 struct sock *sk = sock->sk;
425 struct net_device *dev;
429 DBG("socket %p, sk %p\n", sock, sk);
432 struct sockaddr_can *addr = (struct sockaddr_can *)msg->msg_name;
433 if (addr->can_family != AF_CAN)
435 ifindex = addr->can_ifindex;
437 ifindex = canraw_sk(sk)->ifindex;
439 if (!(dev = dev_get_by_index(ifindex))) {
440 DBG("device %d not found\n", ifindex);
444 skb = alloc_skb(size, GFP_KERNEL);
445 if ((err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size)) < 0) {
451 DBG("sending skbuff to interface %d\n", ifindex);
464 static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
465 struct msghdr *msg, size_t size, int flags)
467 struct sock *sk = sock->sk;
472 DBG("socket %p, sk %p\n", sock, sk);
474 noblock = flags & MSG_DONTWAIT;
475 flags &= ~MSG_DONTWAIT;
476 if (!(skb = skb_recv_datagram(sk, flags, noblock, &error))) {
480 DBG("delivering skbuff %p\n", skb);
484 msg->msg_flags |= MSG_TRUNC;
487 if ((error = memcpy_toiovec(msg->msg_iov, skb->data, size)) < 0) {
488 skb_free_datagram(sk, skb);
492 sock_recv_timestamp(msg, sk, skb);
495 msg->msg_namelen = sizeof(struct sockaddr_can);
496 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
499 DBG("freeing sock %p, skbuff %p\n", sk, skb);
500 skb_free_datagram(sk, skb);
505 static void raw_rcv(struct sk_buff *skb, void *data)
507 struct sock *sk = (struct sock*)data;
508 struct sockaddr_can *addr;
511 DBG("received skbuff %p, sk %p\n", skb, sk);
514 addr = (struct sockaddr_can *)skb->cb;
515 memset(addr, 0, sizeof(*addr));
516 addr->can_family = AF_CAN;
517 addr->can_ifindex = skb->dev->ifindex;
519 if ((error = sock_queue_rcv_skb(sk, skb)) < 0) {
520 DBG("sock_queue_rcv_skb failed: %d\n", error);
521 DBG("freeing skbuff %p\n", skb);
526 static void raw_notifier(unsigned long msg, void *data)
528 struct sock *sk = (struct sock *)data;
530 DBG("called for sock %p\n", sk);
533 case NETDEV_UNREGISTER:
534 canraw_sk(sk)->ifindex = 0;
537 sk->sk_err = ENETDOWN;
538 sk->sk_error_report(sk);
544 module_init(raw_init);
545 module_exit(raw_exit);