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 and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
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15 * 3. Neither the name of Volkswagen nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above.
24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules with a GPL compatible license.
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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40 * Send feedback to <socketcan-users@lists.berlios.de>
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/uio.h>
47 #include <linux/net.h>
48 #include <linux/netdevice.h>
49 #include <linux/socket.h>
50 #include <linux/if_arp.h>
51 #include <linux/skbuff.h>
52 #include <linux/can.h>
53 #include <linux/can/core.h>
54 #include <linux/can/raw.h>
56 #include <net/net_namespace.h>
58 #define CAN_RAW_VERSION CAN_VERSION
59 static __initdata const char banner[] =
60 KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
62 MODULE_DESCRIPTION("PF_CAN raw protocol");
63 MODULE_LICENSE("Dual BSD/GPL");
64 MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
69 * A raw socket has a list of can_filters attached to it, each receiving
70 * the CAN frames matching that filter. If the filter list is empty,
71 * no CAN frames will be received by the socket. The default after
72 * opening the socket, is to have one filter which receives all frames.
73 * The filter list is allocated dynamically with the exception of the
74 * list containing only one item. This common case is optimized by
75 * storing the single filter in dfilter, to avoid using dynamic memory.
82 struct notifier_block notifier;
85 int count; /* number of active filters */
86 struct can_filter dfilter; /* default/single filter */
87 struct can_filter *filter; /* pointer to filter(s) */
88 can_err_mask_t err_mask;
91 static inline struct raw_sock *raw_sk(const struct sock *sk)
93 return (struct raw_sock *)sk;
96 static void raw_rcv(struct sk_buff *skb, void *data)
98 struct sock *sk = (struct sock *)data;
99 struct raw_sock *ro = raw_sk(sk);
100 struct sockaddr_can *addr;
103 if (!ro->recv_own_msgs) {
104 /* check the received tx sock reference */
112 * Put the datagram to the queue so that raw_recvmsg() can
113 * get it from there. We need to pass the interface index to
114 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
115 * containing the interface index.
118 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
119 addr = (struct sockaddr_can *)skb->cb;
120 memset(addr, 0, sizeof(*addr));
121 addr->can_family = AF_CAN;
122 addr->can_ifindex = skb->dev->ifindex;
124 error = sock_queue_rcv_skb(sk, skb);
129 static int raw_enable_filters(struct net_device *dev, struct sock *sk,
130 struct can_filter *filter,
136 for (i = 0; i < count; i++) {
137 err = can_rx_register(dev, filter[i].can_id,
141 /* clean up successfully registered filters */
143 can_rx_unregister(dev, filter[i].can_id,
153 static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
154 can_err_mask_t err_mask)
159 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
165 static void raw_disable_filters(struct net_device *dev, struct sock *sk,
166 struct can_filter *filter,
171 for (i = 0; i < count; i++)
172 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
176 static inline void raw_disable_errfilter(struct net_device *dev,
178 can_err_mask_t err_mask)
182 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
186 static inline void raw_disable_allfilters(struct net_device *dev,
189 struct raw_sock *ro = raw_sk(sk);
191 raw_disable_filters(dev, sk, ro->filter, ro->count);
192 raw_disable_errfilter(dev, sk, ro->err_mask);
195 static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
197 struct raw_sock *ro = raw_sk(sk);
200 err = raw_enable_filters(dev, sk, ro->filter, ro->count);
202 err = raw_enable_errfilter(dev, sk, ro->err_mask);
204 raw_disable_filters(dev, sk, ro->filter, ro->count);
210 static int raw_notifier(struct notifier_block *nb,
211 unsigned long msg, void *data)
213 struct net_device *dev = (struct net_device *)data;
214 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
215 struct sock *sk = &ro->sk;
217 if (dev->nd_net != &init_net)
220 if (dev->type != ARPHRD_CAN)
223 if (ro->ifindex != dev->ifindex)
228 case NETDEV_UNREGISTER:
230 /* remove current filters & unregister */
232 raw_disable_allfilters(dev, sk);
243 if (!sock_flag(sk, SOCK_DEAD))
244 sk->sk_error_report(sk);
248 sk->sk_err = ENETDOWN;
249 if (!sock_flag(sk, SOCK_DEAD))
250 sk->sk_error_report(sk);
257 static int raw_init(struct sock *sk)
259 struct raw_sock *ro = raw_sk(sk);
264 /* set default filter to single entry dfilter */
265 ro->dfilter.can_id = 0;
266 ro->dfilter.can_mask = MASK_ALL;
267 ro->filter = &ro->dfilter;
270 /* set default loopback behaviour */
272 ro->recv_own_msgs = 0;
275 ro->notifier.notifier_call = raw_notifier;
277 register_netdevice_notifier(&ro->notifier);
282 static int raw_release(struct socket *sock)
284 struct sock *sk = sock->sk;
285 struct raw_sock *ro = raw_sk(sk);
287 unregister_netdevice_notifier(&ro->notifier);
291 /* remove current filters & unregister */
294 struct net_device *dev;
296 dev = dev_get_by_index(&init_net, ro->ifindex);
298 raw_disable_allfilters(dev, sk);
302 raw_disable_allfilters(NULL, sk);
318 static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
320 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
321 struct sock *sk = sock->sk;
322 struct raw_sock *ro = raw_sk(sk);
325 int notify_enetdown = 0;
327 if (len < sizeof(*addr))
332 if (ro->bound && addr->can_ifindex == ro->ifindex)
335 if (addr->can_ifindex) {
336 struct net_device *dev;
338 dev = dev_get_by_index(&init_net, addr->can_ifindex);
343 if (dev->type != ARPHRD_CAN) {
348 if (!(dev->flags & IFF_UP))
351 ifindex = dev->ifindex;
353 /* filters set by default/setsockopt */
354 err = raw_enable_allfilters(dev, sk);
360 /* filters set by default/setsockopt */
361 err = raw_enable_allfilters(NULL, sk);
366 /* unregister old filters */
368 struct net_device *dev;
370 dev = dev_get_by_index(&init_net, ro->ifindex);
372 raw_disable_allfilters(dev, sk);
376 raw_disable_allfilters(NULL, sk);
378 ro->ifindex = ifindex;
385 if (notify_enetdown) {
386 sk->sk_err = ENETDOWN;
387 if (!sock_flag(sk, SOCK_DEAD))
388 sk->sk_error_report(sk);
394 static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
397 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
398 struct sock *sk = sock->sk;
399 struct raw_sock *ro = raw_sk(sk);
404 addr->can_family = AF_CAN;
405 addr->can_ifindex = ro->ifindex;
407 *len = sizeof(*addr);
412 static int raw_setsockopt(struct socket *sock, int level, int optname,
413 char __user *optval, int optlen)
415 struct sock *sk = sock->sk;
416 struct raw_sock *ro = raw_sk(sk);
417 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
418 struct can_filter sfilter; /* single filter */
419 struct net_device *dev = NULL;
420 can_err_mask_t err_mask = 0;
424 if (level != SOL_CAN_RAW)
432 if (optlen % sizeof(struct can_filter) != 0)
435 count = optlen / sizeof(struct can_filter);
438 /* filter does not fit into dfilter => alloc space */
439 filter = kmalloc(optlen, GFP_KERNEL);
443 err = copy_from_user(filter, optval, optlen);
448 } else if (count == 1) {
449 err = copy_from_user(&sfilter, optval, optlen);
456 if (ro->bound && ro->ifindex)
457 dev = dev_get_by_index(&init_net, ro->ifindex);
460 /* (try to) register the new filters */
462 err = raw_enable_filters(dev, sk, &sfilter, 1);
464 err = raw_enable_filters(dev, sk, filter,
473 /* remove old filter registrations */
474 raw_disable_filters(dev, sk, ro->filter, ro->count);
477 /* remove old filter space */
481 /* link new filters to the socket */
483 /* copy filter data for single filter */
484 ro->dfilter = sfilter;
485 filter = &ro->dfilter;
498 case CAN_RAW_ERR_FILTER:
499 if (optlen != sizeof(err_mask))
502 err = copy_from_user(&err_mask, optval, optlen);
506 err_mask &= CAN_ERR_MASK;
510 if (ro->bound && ro->ifindex)
511 dev = dev_get_by_index(&init_net, ro->ifindex);
513 /* remove current error mask */
515 /* (try to) register the new err_mask */
516 err = raw_enable_errfilter(dev, sk, err_mask);
521 /* remove old err_mask registration */
522 raw_disable_errfilter(dev, sk, ro->err_mask);
525 /* link new err_mask to the socket */
526 ro->err_mask = err_mask;
536 case CAN_RAW_LOOPBACK:
537 if (optlen != sizeof(ro->loopback))
540 err = copy_from_user(&ro->loopback, optval, optlen);
544 case CAN_RAW_RECV_OWN_MSGS:
545 if (optlen != sizeof(ro->recv_own_msgs))
548 err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
558 static int raw_getsockopt(struct socket *sock, int level, int optname,
559 char __user *optval, int __user *optlen)
561 struct sock *sk = sock->sk;
562 struct raw_sock *ro = raw_sk(sk);
567 if (level != SOL_CAN_RAW)
569 if (get_user(len, optlen))
579 int fsize = ro->count * sizeof(struct can_filter);
582 err = copy_to_user(optval, ro->filter, len);
588 err = put_user(len, optlen);
591 case CAN_RAW_ERR_FILTER:
592 if (len > sizeof(can_err_mask_t))
593 len = sizeof(can_err_mask_t);
597 case CAN_RAW_LOOPBACK:
598 if (len > sizeof(int))
603 case CAN_RAW_RECV_OWN_MSGS:
604 if (len > sizeof(int))
606 val = &ro->recv_own_msgs;
613 if (put_user(len, optlen))
615 if (copy_to_user(optval, val, len))
620 static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
621 struct msghdr *msg, size_t size)
623 struct sock *sk = sock->sk;
624 struct raw_sock *ro = raw_sk(sk);
626 struct net_device *dev;
631 struct sockaddr_can *addr =
632 (struct sockaddr_can *)msg->msg_name;
634 if (addr->can_family != AF_CAN)
637 ifindex = addr->can_ifindex;
639 ifindex = ro->ifindex;
641 dev = dev_get_by_index(&init_net, ifindex);
645 skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
652 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
661 err = can_send(skb, ro->loopback);
671 static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
672 struct msghdr *msg, size_t size, int flags)
674 struct sock *sk = sock->sk;
679 noblock = flags & MSG_DONTWAIT;
680 flags &= ~MSG_DONTWAIT;
682 skb = skb_recv_datagram(sk, flags, noblock, &error);
687 msg->msg_flags |= MSG_TRUNC;
691 error = memcpy_toiovec(msg->msg_iov, skb->data, size);
693 skb_free_datagram(sk, skb);
697 sock_recv_timestamp(msg, sk, skb);
700 msg->msg_namelen = sizeof(struct sockaddr_can);
701 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
704 skb_free_datagram(sk, skb);
709 static struct proto_ops raw_ops __read_mostly = {
711 .release = raw_release,
713 .connect = sock_no_connect,
714 .socketpair = sock_no_socketpair,
715 .accept = sock_no_accept,
716 .getname = raw_getname,
717 .poll = datagram_poll,
718 .ioctl = NULL, /* use can_ioctl() from af_can.c */
719 .listen = sock_no_listen,
720 .shutdown = sock_no_shutdown,
721 .setsockopt = raw_setsockopt,
722 .getsockopt = raw_getsockopt,
723 .sendmsg = raw_sendmsg,
724 .recvmsg = raw_recvmsg,
725 .mmap = sock_no_mmap,
726 .sendpage = sock_no_sendpage,
729 static struct proto raw_proto __read_mostly = {
731 .owner = THIS_MODULE,
732 .obj_size = sizeof(struct raw_sock),
736 static struct can_proto raw_can_proto __read_mostly = {
744 static __init int raw_module_init(void)
750 err = can_proto_register(&raw_can_proto);
752 printk(KERN_ERR "can: registration of raw protocol failed\n");
757 static __exit void raw_module_exit(void)
759 can_proto_unregister(&raw_can_proto);
762 module_init(raw_module_init);
763 module_exit(raw_module_exit);