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
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
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/version.h>
46 #include <linux/init.h>
47 #include <linux/uio.h>
48 #include <linux/net.h>
49 #include <linux/netdevice.h>
50 #include <linux/socket.h>
51 #include <linux/if_arp.h>
52 #include <linux/skbuff.h>
53 #include <linux/can.h>
54 #include <linux/can/core.h>
55 #include <linux/can/raw.h>
57 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
58 #include <net/net_namespace.h>
60 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
64 #include <linux/can/version.h> /* for RCSID. Removed by mkpatch script */
67 #define CAN_RAW_VERSION CAN_VERSION
68 static __initdata const char banner[] =
69 KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
71 MODULE_DESCRIPTION("PF_CAN raw protocol");
72 MODULE_LICENSE("Dual BSD/GPL");
73 MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
78 * A raw socket has a list of can_filters attached to it, each receiving
79 * the CAN frames matching that filter. If the filter list is empty,
80 * no CAN frames will be received by the socket. The default after
81 * opening the socket, is to have one filter which receives all frames.
82 * The filter list is allocated dynamically with the exception of the
83 * list containing only one item. This common case is optimized by
84 * storing the single filter in dfilter, to avoid using dynamic memory.
88 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
95 struct notifier_block notifier;
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 static inline struct raw_sock *raw_sk(const struct sock *sk)
106 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
107 return (struct raw_sock *)sk;
109 return (struct raw_sock *)sk->sk_protinfo;
113 static void raw_rcv(struct sk_buff *skb, void *data)
115 struct sock *sk = (struct sock *)data;
116 struct raw_sock *ro = raw_sk(sk);
117 struct sockaddr_can *addr;
119 /* check the received tx sock reference */
120 if ((!ro->recv_own_msgs) && (skb->sk == sk))
123 /* clone the given skb to be able to enqueue it into the rcv queue */
124 skb = skb_clone(skb, GFP_ATOMIC);
129 * Put the datagram to the queue so that raw_recvmsg() can
130 * get it from there. We need to pass the interface index to
131 * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
132 * containing the interface index.
135 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
136 addr = (struct sockaddr_can *)skb->cb;
137 memset(addr, 0, sizeof(*addr));
138 addr->can_family = AF_CAN;
139 addr->can_ifindex = skb->dev->ifindex;
141 if (sock_queue_rcv_skb(sk, skb) < 0)
145 static int raw_enable_filters(struct net_device *dev, struct sock *sk,
146 struct can_filter *filter, int count)
151 for (i = 0; i < count; i++) {
152 err = can_rx_register(dev, filter[i].can_id,
156 /* clean up successfully registered filters */
158 can_rx_unregister(dev, filter[i].can_id,
168 static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
169 can_err_mask_t err_mask)
174 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
180 static void raw_disable_filters(struct net_device *dev, struct sock *sk,
181 struct can_filter *filter, int count)
185 for (i = 0; i < count; i++)
186 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
190 static inline void raw_disable_errfilter(struct net_device *dev,
192 can_err_mask_t err_mask)
196 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
200 static inline void raw_disable_allfilters(struct net_device *dev,
203 struct raw_sock *ro = raw_sk(sk);
205 raw_disable_filters(dev, sk, ro->filter, ro->count);
206 raw_disable_errfilter(dev, sk, ro->err_mask);
209 static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
211 struct raw_sock *ro = raw_sk(sk);
214 err = raw_enable_filters(dev, sk, ro->filter, ro->count);
216 err = raw_enable_errfilter(dev, sk, ro->err_mask);
218 raw_disable_filters(dev, sk, ro->filter, ro->count);
224 static int raw_notifier(struct notifier_block *nb,
225 unsigned long msg, void *data)
227 struct net_device *dev = (struct net_device *)data;
228 struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
229 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
230 struct sock *sk = &ro->sk;
232 struct sock *sk = ro->sk;
235 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
236 if (!net_eq(dev_net(dev), &init_net))
238 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
239 if (dev->nd_net != &init_net)
243 if (dev->type != ARPHRD_CAN)
246 if (ro->ifindex != dev->ifindex)
251 case NETDEV_UNREGISTER:
253 /* remove current filters & unregister */
255 raw_disable_allfilters(dev, sk);
266 if (!sock_flag(sk, SOCK_DEAD))
267 sk->sk_error_report(sk);
271 sk->sk_err = ENETDOWN;
272 if (!sock_flag(sk, SOCK_DEAD))
273 sk->sk_error_report(sk);
280 static int raw_init(struct sock *sk)
282 struct raw_sock *ro = raw_sk(sk);
284 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,12)
290 /* set default filter to single entry dfilter */
291 ro->dfilter.can_id = 0;
292 ro->dfilter.can_mask = MASK_ALL;
293 ro->filter = &ro->dfilter;
296 /* set default loopback behaviour */
298 ro->recv_own_msgs = 0;
301 ro->notifier.notifier_call = raw_notifier;
303 register_netdevice_notifier(&ro->notifier);
308 static int raw_release(struct socket *sock)
310 struct sock *sk = sock->sk;
311 struct raw_sock *ro = raw_sk(sk);
313 unregister_netdevice_notifier(&ro->notifier);
317 /* remove current filters & unregister */
320 struct net_device *dev;
322 dev = dev_get_by_index(&init_net, ro->ifindex);
324 raw_disable_allfilters(dev, sk);
328 raw_disable_allfilters(NULL, sk);
344 static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
346 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
347 struct sock *sk = sock->sk;
348 struct raw_sock *ro = raw_sk(sk);
351 int notify_enetdown = 0;
353 if (len < sizeof(*addr))
358 if (ro->bound && addr->can_ifindex == ro->ifindex)
361 if (addr->can_ifindex) {
362 struct net_device *dev;
364 dev = dev_get_by_index(&init_net, addr->can_ifindex);
369 if (dev->type != ARPHRD_CAN) {
374 if (!(dev->flags & IFF_UP))
377 ifindex = dev->ifindex;
379 /* filters set by default/setsockopt */
380 err = raw_enable_allfilters(dev, sk);
385 /* filters set by default/setsockopt */
386 err = raw_enable_allfilters(NULL, sk);
391 /* unregister old filters */
393 struct net_device *dev;
395 dev = dev_get_by_index(&init_net, ro->ifindex);
397 raw_disable_allfilters(dev, sk);
401 raw_disable_allfilters(NULL, sk);
403 ro->ifindex = ifindex;
410 if (notify_enetdown) {
411 sk->sk_err = ENETDOWN;
412 if (!sock_flag(sk, SOCK_DEAD))
413 sk->sk_error_report(sk);
419 static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
422 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
423 struct sock *sk = sock->sk;
424 struct raw_sock *ro = raw_sk(sk);
429 addr->can_family = AF_CAN;
430 addr->can_ifindex = ro->ifindex;
432 *len = sizeof(*addr);
437 static int raw_setsockopt(struct socket *sock, int level, int optname,
438 char __user *optval, int optlen)
440 struct sock *sk = sock->sk;
441 struct raw_sock *ro = raw_sk(sk);
442 struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
443 struct can_filter sfilter; /* single filter */
444 struct net_device *dev = NULL;
445 can_err_mask_t err_mask = 0;
449 if (level != SOL_CAN_RAW)
457 if (optlen % sizeof(struct can_filter) != 0)
460 count = optlen / sizeof(struct can_filter);
463 /* filter does not fit into dfilter => alloc space */
464 filter = kmalloc(optlen, GFP_KERNEL);
468 if (copy_from_user(filter, optval, optlen)) {
472 } else if (count == 1) {
473 if (copy_from_user(&sfilter, optval, optlen))
479 if (ro->bound && ro->ifindex)
480 dev = dev_get_by_index(&init_net, ro->ifindex);
483 /* (try to) register the new filters */
485 err = raw_enable_filters(dev, sk, &sfilter, 1);
487 err = raw_enable_filters(dev, sk, filter,
495 /* remove old filter registrations */
496 raw_disable_filters(dev, sk, ro->filter, ro->count);
499 /* remove old filter space */
503 /* link new filters to the socket */
505 /* copy filter data for single filter */
506 ro->dfilter = sfilter;
507 filter = &ro->dfilter;
520 case CAN_RAW_ERR_FILTER:
521 if (optlen != sizeof(err_mask))
524 if (copy_from_user(&err_mask, optval, optlen))
527 err_mask &= CAN_ERR_MASK;
531 if (ro->bound && ro->ifindex)
532 dev = dev_get_by_index(&init_net, ro->ifindex);
534 /* remove current error mask */
536 /* (try to) register the new err_mask */
537 err = raw_enable_errfilter(dev, sk, err_mask);
542 /* remove old err_mask registration */
543 raw_disable_errfilter(dev, sk, ro->err_mask);
546 /* link new err_mask to the socket */
547 ro->err_mask = err_mask;
557 case CAN_RAW_LOOPBACK:
558 if (optlen != sizeof(ro->loopback))
561 if (copy_from_user(&ro->loopback, optval, optlen))
566 case CAN_RAW_RECV_OWN_MSGS:
567 if (optlen != sizeof(ro->recv_own_msgs))
570 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
581 static int raw_getsockopt(struct socket *sock, int level, int optname,
582 char __user *optval, int __user *optlen)
584 struct sock *sk = sock->sk;
585 struct raw_sock *ro = raw_sk(sk);
590 if (level != SOL_CAN_RAW)
592 if (get_user(len, optlen))
602 int fsize = ro->count * sizeof(struct can_filter);
605 if (copy_to_user(optval, ro->filter, len))
612 err = put_user(len, optlen);
615 case CAN_RAW_ERR_FILTER:
616 if (len > sizeof(can_err_mask_t))
617 len = sizeof(can_err_mask_t);
621 case CAN_RAW_LOOPBACK:
622 if (len > sizeof(int))
627 case CAN_RAW_RECV_OWN_MSGS:
628 if (len > sizeof(int))
630 val = &ro->recv_own_msgs;
637 if (put_user(len, optlen))
639 if (copy_to_user(optval, val, len))
644 static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
645 struct msghdr *msg, size_t size)
647 struct sock *sk = sock->sk;
648 struct raw_sock *ro = raw_sk(sk);
650 struct net_device *dev;
655 struct sockaddr_can *addr =
656 (struct sockaddr_can *)msg->msg_name;
658 if (addr->can_family != AF_CAN)
661 ifindex = addr->can_ifindex;
663 ifindex = ro->ifindex;
665 if (size != sizeof(struct can_frame))
668 dev = dev_get_by_index(&init_net, ifindex);
672 skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
677 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
683 err = can_send(skb, ro->loopback);
700 static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
701 struct msghdr *msg, size_t size, int flags)
703 struct sock *sk = sock->sk;
708 noblock = flags & MSG_DONTWAIT;
709 flags &= ~MSG_DONTWAIT;
711 skb = skb_recv_datagram(sk, flags, noblock, &err);
716 msg->msg_flags |= MSG_TRUNC;
720 err = memcpy_toiovec(msg->msg_iov, skb->data, size);
722 skb_free_datagram(sk, skb);
726 sock_recv_timestamp(msg, sk, skb);
729 msg->msg_namelen = sizeof(struct sockaddr_can);
730 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
733 skb_free_datagram(sk, skb);
738 static struct proto_ops raw_ops __read_mostly = {
740 .release = raw_release,
742 .connect = sock_no_connect,
743 .socketpair = sock_no_socketpair,
744 .accept = sock_no_accept,
745 .getname = raw_getname,
746 .poll = datagram_poll,
747 .ioctl = NULL, /* use can_ioctl() from af_can.c */
748 .listen = sock_no_listen,
749 .shutdown = sock_no_shutdown,
750 .setsockopt = raw_setsockopt,
751 .getsockopt = raw_getsockopt,
752 .sendmsg = raw_sendmsg,
753 .recvmsg = raw_recvmsg,
754 .mmap = sock_no_mmap,
755 .sendpage = sock_no_sendpage,
758 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
759 static struct proto raw_proto __read_mostly = {
761 .owner = THIS_MODULE,
762 .obj_size = sizeof(struct raw_sock),
766 static struct can_proto raw_can_proto __read_mostly = {
774 static struct can_proto raw_can_proto __read_mostly = {
779 .owner = THIS_MODULE,
780 .obj_size = sizeof(struct raw_sock),
785 static __init int raw_module_init(void)
791 err = can_proto_register(&raw_can_proto);
793 printk(KERN_ERR "can: registration of raw protocol failed\n");
798 static __exit void raw_module_exit(void)
800 can_proto_unregister(&raw_can_proto);
803 module_init(raw_module_init);
804 module_exit(raw_module_exit);