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, 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
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34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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41 * Send feedback to <socketcan-users@lists.berlios.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>
52 #include <linux/can.h>
53 #include <linux/can/core.h>
54 #include <linux/can/raw.h>
57 #include <linux/can/version.h> /* for RCSID. Removed by mkpatch script */
61 #define CAN_RAW_VERSION CAN_VERSION
62 static __initdata const char banner[] =
63 KERN_INFO "can: raw protocol # rev " CAN_RAW_VERSION "\n";
65 MODULE_DESCRIPTION("PF_CAN raw protocol");
66 MODULE_LICENSE("Dual BSD/GPL");
67 MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
69 #ifdef CONFIG_CAN_DEBUG_CORE
71 module_param(debug, int, S_IRUGO);
72 MODULE_PARM_DESC(debug, "debug print mask: 1:debug, 2:frames, 4:skbs");
75 #ifdef CONFIG_CAN_RAW_USER
78 #define RAW_CAP CAP_NET_RAW
84 * A raw socket has a list of can_filters attached to it, each receiving
85 * the CAN frames matching that filter. If the filter list is empty,
86 * no CAN frames will be received by the socket. The default after
87 * opening the socket, is to have one filter which receives all frames.
88 * The filter list is allocated dynamically with the exception of the
89 * list containing only one item. This common case is optimized by
90 * storing the single filter in dfilter, to avoid using dynamic memory.
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 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
110 static inline struct raw_opt *raw_sk(const struct sock *sk)
112 return &((struct raw_sock *)sk)->opt;
115 static inline struct raw_opt *raw_sk(const struct sock *sk)
117 return (struct raw_opt *)sk->sk_protinfo;
121 static void raw_notifier(unsigned long msg, void *data);
123 static void raw_rcv(struct sk_buff *skb, void *data)
125 struct sock *sk = (struct sock*)data;
126 struct raw_opt *ro = raw_sk(sk);
127 struct sockaddr_can *addr;
130 DBG("received skbuff %p, sk %p\n", skb, sk);
133 if (!ro->recv_own_msgs) {
134 /* check the received tx sock reference */
136 DBG("trashed own tx msg\n");
142 addr = (struct sockaddr_can *)skb->cb;
143 memset(addr, 0, sizeof(*addr));
144 addr->can_family = AF_CAN;
145 addr->can_ifindex = skb->dev->ifindex;
147 error = sock_queue_rcv_skb(sk, skb);
149 DBG("sock_queue_rcv_skb failed: %d\n", error);
150 DBG("freeing skbuff %p\n", skb);
155 static int raw_add_filters(int ifindex, struct sock *sk)
157 struct raw_opt *ro = raw_sk(sk);
158 struct can_filter *filter = ro->filter;
162 for (i = 0; i < ro->count && !ret; i++) {
163 ret = can_rx_register(ifindex, filter[i].can_id,
166 DBG("filter can_id %08X, can_mask %08X%s, sk %p\n",
167 filter[i].can_id, filter[i].can_mask,
168 filter[i].can_id & CAN_INV_FILTER ? " (inv)" : "", sk);
174 static int raw_remove_filters(int ifindex, struct sock *sk)
176 struct raw_opt *ro = raw_sk(sk);
177 struct can_filter *filter = ro->filter;
181 for (i = 0; i < ro->count && !ret; i++) {
182 ret = can_rx_unregister(ifindex, filter[i].can_id,
183 filter[i].can_mask, raw_rcv, sk);
184 DBG("filter can_id %08X, can_mask %08X%s, sk %p\n",
185 filter[i].can_id, filter[i].can_mask,
186 filter[i].can_id & CAN_INV_FILTER ? " (inv)" : "", sk);
192 static int raw_init(struct sock *sk)
194 struct raw_opt *ro = raw_sk(sk);
198 /* set default filter to single entry dfilter */
199 ro->dfilter.can_id = 0;
200 ro->dfilter.can_mask = MASK_ALL;
201 ro->filter = &ro->dfilter;
204 /* set default loopback behaviour */
206 ro->recv_own_msgs = 0;
211 static int raw_unbind(struct sock *sk)
213 struct raw_opt *ro = raw_sk(sk);
214 int ifindex = ro->ifindex;
216 /* remove current filters & unregister */
217 raw_remove_filters(ifindex, sk);
219 /* remove current error mask */
221 can_rx_unregister(ifindex, 0, ro->err_mask | CAN_ERR_FLAG,
225 can_dev_unregister(ifindex, raw_notifier, sk);
233 static void raw_notifier(unsigned long msg, void *data)
235 struct sock *sk = (struct sock *)data;
236 //@@@@@ struct raw_opt *ro = raw_sk(sk);
238 DBG("called for sock %p\n", sk);
246 * - put notifier into raw_opt
247 * - remove notifier with rcu
248 * - put notifier list 'device dependend' into dev_rcv_lists
255 sk->sk_err = ENETDOWN;
256 if (!sock_flag(sk, SOCK_DEAD))
257 sk->sk_error_report(sk);
262 static int raw_release(struct socket *sock)
264 struct sock *sk = sock->sk;
265 struct raw_opt *ro = raw_sk(sk);
267 DBG("socket %p, sk %p, refcnt %d\n", sock, sk,
268 atomic_read(&sk->sk_refcnt));
281 static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
283 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
284 struct sock *sk = sock->sk;
285 struct raw_opt *ro = raw_sk(sk);
286 int ifindex = addr->can_ifindex;
289 DBG("socket %p to device %d\n", sock, addr->can_ifindex);
291 if (len < sizeof(*addr))
298 * remove current bindings, filters and notifier but
299 * do not purge the current local filter content.
305 err = can_dev_register(ifindex, raw_notifier, sk);
310 /* filters set by default/setsockopt */
311 err = raw_add_filters(ifindex, sk);
313 raw_remove_filters(ifindex, sk);
315 can_dev_unregister(ifindex, raw_notifier, sk);
319 /* error frame filter set by setsockopt */
321 err = can_rx_register(ifindex, 0,
322 ro->err_mask | CAN_ERR_FLAG,
325 raw_remove_filters(ifindex, sk);
327 can_dev_unregister(ifindex, raw_notifier, sk);
331 ro->ifindex = ifindex;
340 static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
343 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
344 struct sock *sk = sock->sk;
345 struct raw_opt *ro = raw_sk(sk);
350 addr->can_family = AF_CAN;
351 addr->can_ifindex = ro->ifindex;
352 *len = sizeof(*addr);
357 static unsigned int raw_poll(struct file *file, struct socket *sock,
360 unsigned int mask = 0;
362 DBG("socket %p\n", sock);
364 mask = datagram_poll(file, sock, wait);
368 static int raw_setsockopt(struct socket *sock, int level, int optname,
369 char __user *optval, int optlen)
371 struct sock *sk = sock->sk;
372 struct raw_opt *ro = raw_sk(sk);
373 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
374 struct can_filter sfilter; /* single filter */
375 can_err_mask_t err_mask = 0;
379 if (level != SOL_CAN_RAW)
387 if (optlen % sizeof(struct can_filter) != 0)
390 count = optlen / sizeof(struct can_filter);
393 /* filter does not fit into dfilter => alloc space */
394 filter = kmalloc(optlen, GFP_KERNEL);
398 err = copy_from_user(filter, optval, optlen);
403 } else if (count == 1) {
404 err = copy_from_user(&sfilter, optval, optlen);
411 /* remove current filters & unregister */
413 raw_remove_filters(ro->ifindex, sk);
419 /* copy filter data for single filter */
420 ro->dfilter = sfilter;
421 filter = &ro->dfilter;
424 /* add new filters & register */
428 raw_add_filters(ro->ifindex, sk);
434 case CAN_RAW_ERR_FILTER:
435 if (optlen != sizeof(err_mask))
438 err = copy_from_user(&err_mask, optval, optlen);
442 err_mask &= CAN_ERR_MASK;
444 /* remove current error mask */
445 if (ro->err_mask && ro->bound)
446 can_rx_unregister(ro->ifindex, 0,
447 ro->err_mask | CAN_ERR_FLAG,
450 /* add new error mask */
451 ro->err_mask = err_mask;
452 if (ro->err_mask && ro->bound)
453 can_rx_register(ro->ifindex, 0,
454 ro->err_mask | CAN_ERR_FLAG,
458 case CAN_RAW_LOOPBACK:
459 if (optlen != sizeof(ro->loopback))
462 err = copy_from_user(&ro->loopback, optval, optlen);
468 case CAN_RAW_RECV_OWN_MSGS:
469 if (optlen != sizeof(ro->recv_own_msgs))
472 err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
484 static int raw_getsockopt(struct socket *sock, int level, int optname,
485 char __user *optval, int __user *optlen)
487 struct sock *sk = sock->sk;
488 struct raw_opt *ro = raw_sk(sk);
489 struct can_filter *filter = ro->filter;
490 int count = ro->count;
494 if (level != SOL_CAN_RAW)
496 if (get_user(len, optlen))
504 if (count && filter) {
505 int filter_size = count * sizeof(struct can_filter);
506 if (len > filter_size)
513 case CAN_RAW_ERR_FILTER:
514 if (len > sizeof(can_err_mask_t))
515 len = sizeof(can_err_mask_t);
519 case CAN_RAW_LOOPBACK:
520 if (len > sizeof(int))
525 case CAN_RAW_RECV_OWN_MSGS:
526 if (len > sizeof(int))
528 val = &ro->recv_own_msgs;
535 if (put_user(len, optlen))
537 if (copy_to_user(optval, val, len))
542 static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
543 struct msghdr *msg, size_t size)
545 struct sock *sk = sock->sk;
546 struct raw_opt *ro = raw_sk(sk);
548 struct net_device *dev;
552 DBG("socket %p, sk %p\n", sock, sk);
555 struct sockaddr_can *addr =
556 (struct sockaddr_can *)msg->msg_name;
558 if (addr->can_family != AF_CAN)
561 ifindex = addr->can_ifindex;
563 ifindex = ro->ifindex;
565 dev = dev_get_by_index(ifindex);
567 DBG("device %d not found\n", ifindex);
571 skb = alloc_skb(size, GFP_KERNEL);
577 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
586 DBG("sending skbuff to interface %d\n", ifindex);
589 err = can_send(skb, ro->loopback);
599 static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
600 struct msghdr *msg, size_t size, int flags)
602 struct sock *sk = sock->sk;
607 DBG("socket %p, sk %p\n", sock, sk);
609 noblock = flags & MSG_DONTWAIT;
610 flags &= ~MSG_DONTWAIT;
612 skb = skb_recv_datagram(sk, flags, noblock, &error);
616 DBG("delivering skbuff %p\n", skb);
620 msg->msg_flags |= MSG_TRUNC;
624 error = memcpy_toiovec(msg->msg_iov, skb->data, size);
626 skb_free_datagram(sk, skb);
630 sock_recv_timestamp(msg, sk, skb);
633 msg->msg_namelen = sizeof(struct sockaddr_can);
634 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
637 DBG("freeing sock %p, skbuff %p\n", sk, skb);
638 skb_free_datagram(sk, skb);
643 static struct proto_ops raw_ops = {
645 .release = raw_release,
647 .connect = sock_no_connect,
648 .socketpair = sock_no_socketpair,
649 .accept = sock_no_accept,
650 .getname = raw_getname,
652 .ioctl = NULL, /* use can_ioctl() from af_can.c */
653 .listen = sock_no_listen,
654 .shutdown = sock_no_shutdown,
655 .setsockopt = raw_setsockopt,
656 .getsockopt = raw_getsockopt,
657 .sendmsg = raw_sendmsg,
658 .recvmsg = raw_recvmsg,
659 .mmap = sock_no_mmap,
660 .sendpage = sock_no_sendpage,
663 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
664 static struct proto raw_proto = {
666 .owner = THIS_MODULE,
667 .obj_size = sizeof(struct raw_sock),
671 static struct can_proto raw_can_proto = {
674 .capability = RAW_CAP,
679 static struct can_proto raw_can_proto = {
682 .capability = RAW_CAP,
684 .owner = THIS_MODULE,
685 .obj_size = sizeof(struct raw_opt),
690 static __init int raw_module_init(void)
694 can_proto_register(&raw_can_proto);
698 static __exit void raw_module_exit(void)
700 can_proto_unregister(&raw_can_proto);
703 module_init(raw_module_init);
704 module_exit(raw_module_exit);