2 * af_can.c - Protocol family CAN core module
3 * (used by different CAN protocol modules)
5 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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, in which case the provisions of the
23 * GPL apply INSTEAD OF those given above.
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 <socketcan-users@lists.berlios.de>
45 #include <linux/module.h>
46 #include <linux/version.h>
47 #include <linux/init.h>
48 #include <linux/kmod.h>
49 #include <linux/slab.h>
50 #include <linux/list.h>
51 #include <linux/spinlock.h>
52 #include <linux/rcupdate.h>
53 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
54 #include <linux/uaccess.h>
56 #include <asm/uaccess.h>
58 #include <linux/net.h>
59 #include <linux/netdevice.h>
60 #include <linux/socket.h>
61 #include <linux/if_ether.h>
62 #include <linux/if_arp.h>
63 #include <linux/skbuff.h>
64 #include <linux/can.h>
65 #include <linux/can/core.h>
66 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
67 #include <net/net_namespace.h>
72 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
76 #include <linux/can/version.h> /* for RCSID. Removed by mkpatch script */
79 static __initdata const char banner[] = KERN_INFO
80 "can: controller area network core (" CAN_VERSION_STRING ")\n";
82 MODULE_DESCRIPTION("Controller Area Network PF_CAN core");
83 MODULE_LICENSE("Dual BSD/GPL");
84 MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>, "
85 "Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
87 MODULE_ALIAS_NETPROTO(PF_CAN);
89 static int stats_timer __read_mostly = 1;
90 module_param(stats_timer, int, S_IRUGO);
91 MODULE_PARM_DESC(stats_timer, "enable timer for statistics (default:on)");
93 HLIST_HEAD(can_rx_dev_list);
94 static struct dev_rcv_lists can_rx_alldev_list;
95 static DEFINE_SPINLOCK(can_rcvlists_lock);
97 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
98 static struct kmem_cache *rcv_cache __read_mostly;
100 static kmem_cache_t *rcv_cache;
103 /* table of registered CAN protocols */
104 static struct can_proto *proto_tab[CAN_NPROTO] __read_mostly;
105 static DEFINE_SPINLOCK(proto_tab_lock);
107 struct timer_list can_stattimer; /* timer for statistics update */
108 struct s_stats can_stats; /* packet statistics */
109 struct s_pstats can_pstats; /* receive list statistics */
112 * af_can socket functions
115 static int can_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
117 struct sock *sk = sock->sk;
122 return sock_get_timestamp(sk, (struct timeval __user *)arg);
125 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
128 return dev_ioctl(cmd, (void __user *)arg);
133 static void can_sock_destruct(struct sock *sk)
135 skb_queue_purge(&sk->sk_receive_queue);
136 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,12)
138 kfree(sk->sk_protinfo);
142 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
143 static int can_create(struct net *net, struct socket *sock, int protocol)
145 static int can_create(struct socket *sock, int protocol)
149 struct can_proto *cp;
152 sock->state = SS_UNCONNECTED;
154 if (protocol < 0 || protocol >= CAN_NPROTO)
157 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
158 if (net != &init_net)
159 return -EAFNOSUPPORT;
162 /* try to load protocol module, when CONFIG_KMOD is defined */
163 if (!proto_tab[protocol]) {
164 err = request_module("can-proto-%d", protocol);
167 * In case of error we only print a message but don't
168 * return the error code immediately. Below we will
169 * return -EPROTONOSUPPORT
171 if (err == -ENOSYS) {
172 if (printk_ratelimit())
173 printk(KERN_INFO "can: request_module()"
174 " not implemented.\n");
176 if (printk_ratelimit())
177 printk(KERN_ERR "can: request_module "
178 "(can-proto-%d) failed.\n", protocol);
182 spin_lock(&proto_tab_lock);
183 cp = proto_tab[protocol];
184 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
185 if (cp && !try_module_get(cp->prot->owner))
188 if (cp && !try_module_get(cp->owner))
191 spin_unlock(&proto_tab_lock);
193 /* check for available protocol and correct usage */
196 return -EPROTONOSUPPORT;
198 if (cp->type != sock->type) {
199 err = -EPROTONOSUPPORT;
203 if (cp->capability >= 0 && !capable(cp->capability)) {
210 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
211 sk = sk_alloc(net, PF_CAN, GFP_KERNEL, cp->prot);
212 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
213 sk = sk_alloc(PF_CAN, GFP_KERNEL, cp->prot, 1);
215 sk = sk_alloc(PF_CAN, GFP_KERNEL, 1, 0);
222 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,12)
224 sk->sk_protinfo = kmalloc(cp->obj_size, GFP_KERNEL);
225 if (!sk->sk_protinfo) {
231 sk_set_owner(sk, proto_tab[protocol]->owner);
234 sock_init_data(sock, sk);
235 sk->sk_destruct = can_sock_destruct;
237 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
238 if (sk->sk_prot->init)
239 err = sk->sk_prot->init(sk);
246 /* release sk on errors */
252 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
253 module_put(cp->prot->owner);
255 module_put(cp->owner);
265 * can_send - transmit a CAN frame (optional with local loopback)
266 * @skb: pointer to socket buffer with CAN frame in data section
267 * @loop: loopback for listeners on local CAN sockets (recommended default!)
271 * -ENETDOWN when the selected interface is down
272 * -ENOBUFS on full driver queue (see net_xmit_errno())
273 * -ENOMEM when local loopback failed at calling skb_clone()
274 * -EPERM when trying to send on a non-CAN interface
276 int can_send(struct sk_buff *skb, int loop)
280 if (skb->dev->type != ARPHRD_CAN) {
285 if (!(skb->dev->flags & IFF_UP)) {
290 skb->protocol = htons(ETH_P_CAN);
291 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
292 skb_reset_network_header(skb);
293 skb_reset_transport_header(skb);
295 skb->nh.raw = skb->data;
296 skb->h.raw = skb->data;
300 /* local loopback of sent CAN frames */
302 /* indication for the CAN driver: do loopback */
303 skb->pkt_type = PACKET_LOOPBACK;
306 * The reference to the originating sock may be required
307 * by the receiving socket to check whether the frame is
308 * its own. Example: can_raw sockopt CAN_RAW_RECV_OWN_MSGS
309 * Therefore we have to ensure that skb->sk remains the
310 * reference to the originating sock by restoring skb->sk
311 * after each skb_clone() or skb_orphan() usage.
314 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
315 #define IFF_ECHO IFF_LOOPBACK
317 if (!(skb->dev->flags & IFF_ECHO)) {
319 * If the interface is not capable to do loopback
320 * itself, we do it here.
322 struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
329 newskb->sk = skb->sk;
330 newskb->ip_summed = CHECKSUM_UNNECESSARY;
331 newskb->pkt_type = PACKET_BROADCAST;
335 /* indication for the CAN driver: no loopback required */
336 skb->pkt_type = PACKET_HOST;
339 /* send to netdevice */
340 err = dev_queue_xmit(skb);
342 err = net_xmit_errno(err);
344 /* update statistics */
345 can_stats.tx_frames++;
346 can_stats.tx_frames_delta++;
350 EXPORT_SYMBOL(can_send);
356 static struct dev_rcv_lists *find_dev_rcv_lists(struct net_device *dev)
358 struct dev_rcv_lists *d = NULL;
359 struct hlist_node *n;
362 * find receive list for this device
364 * The hlist_for_each_entry*() macros curse through the list
365 * using the pointer variable n and set d to the containing
366 * struct in each list iteration. Therefore, after list
367 * iteration, d is unmodified when the list is empty, and it
368 * points to last list element, when the list is non-empty
369 * but no match in the loop body is found. I.e. d is *not*
370 * NULL when no match is found. We can, however, use the
371 * cursor variable n to decide if a match was found.
374 hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
382 static struct hlist_head *find_rcv_list(canid_t *can_id, canid_t *mask,
383 struct dev_rcv_lists *d)
385 canid_t inv = *can_id & CAN_INV_FILTER; /* save flag before masking */
387 /* filter error frames */
388 if (*mask & CAN_ERR_FLAG) {
389 /* clear CAN_ERR_FLAG in list entry */
390 *mask &= CAN_ERR_MASK;
391 return &d->rx[RX_ERR];
394 /* ensure valid values in can_mask */
395 if (*mask & CAN_EFF_FLAG)
396 *mask &= (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG);
398 *mask &= (CAN_SFF_MASK | CAN_RTR_FLAG);
400 /* reduce condition testing at receive time */
403 /* inverse can_id/can_mask filter */
405 return &d->rx[RX_INV];
407 /* mask == 0 => no condition testing at receive time */
409 return &d->rx[RX_ALL];
411 /* use extra filterset for the subscription of exactly *ONE* can_id */
412 if (*can_id & CAN_EFF_FLAG) {
413 if (*mask == (CAN_EFF_MASK | CAN_EFF_FLAG)) {
414 /* RFC: a use-case for hash-tables in the future? */
415 return &d->rx[RX_EFF];
418 if (*mask == CAN_SFF_MASK)
419 return &d->rx_sff[*can_id];
422 /* default: filter via can_id/can_mask */
423 return &d->rx[RX_FIL];
427 * can_rx_register - subscribe CAN frames from a specific interface
428 * @dev: pointer to netdevice (NULL => subcribe from 'all' CAN devices list)
429 * @can_id: CAN identifier (see description)
430 * @mask: CAN mask (see description)
431 * @func: callback function on filter match
432 * @data: returned parameter for callback function
433 * @ident: string for calling module indentification
436 * Invokes the callback function with the received sk_buff and the given
437 * parameter 'data' on a matching receive filter. A filter matches, when
439 * <received_can_id> & mask == can_id & mask
441 * The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
442 * filter for error frames (CAN_ERR_FLAG bit set in mask).
446 * -ENOMEM on missing cache mem to create subscription entry
447 * -ENODEV unknown device
449 int can_rx_register(struct net_device *dev, canid_t can_id, canid_t mask,
450 void (*func)(struct sk_buff *, void *), void *data,
454 struct hlist_head *rl;
455 struct dev_rcv_lists *d;
458 /* insert new receiver (dev,canid,mask) -> (func,data) */
460 r = kmem_cache_alloc(rcv_cache, GFP_KERNEL);
464 spin_lock(&can_rcvlists_lock);
466 d = find_dev_rcv_lists(dev);
468 rl = find_rcv_list(&can_id, &mask, d);
477 hlist_add_head_rcu(&r->list, rl);
480 can_pstats.rcv_entries++;
481 if (can_pstats.rcv_entries_max < can_pstats.rcv_entries)
482 can_pstats.rcv_entries_max = can_pstats.rcv_entries;
484 kmem_cache_free(rcv_cache, r);
488 spin_unlock(&can_rcvlists_lock);
492 EXPORT_SYMBOL(can_rx_register);
495 * can_rx_delete_device - rcu callback for dev_rcv_lists structure removal
497 static void can_rx_delete_device(struct rcu_head *rp)
499 struct dev_rcv_lists *d = container_of(rp, struct dev_rcv_lists, rcu);
505 * can_rx_delete_receiver - rcu callback for single receiver entry removal
507 static void can_rx_delete_receiver(struct rcu_head *rp)
509 struct receiver *r = container_of(rp, struct receiver, rcu);
511 kmem_cache_free(rcv_cache, r);
515 * can_rx_unregister - unsubscribe CAN frames from a specific interface
516 * @dev: pointer to netdevice (NULL => unsubcribe from 'all' CAN devices list)
517 * @can_id: CAN identifier
519 * @func: callback function on filter match
520 * @data: returned parameter for callback function
523 * Removes subscription entry depending on given (subscription) values.
525 void can_rx_unregister(struct net_device *dev, canid_t can_id, canid_t mask,
526 void (*func)(struct sk_buff *, void *), void *data)
528 struct receiver *r = NULL;
529 struct hlist_head *rl;
530 struct hlist_node *next;
531 struct dev_rcv_lists *d;
533 spin_lock(&can_rcvlists_lock);
535 d = find_dev_rcv_lists(dev);
537 printk(KERN_ERR "BUG: receive list not found for "
538 "dev %s, id %03X, mask %03X\n",
539 DNAME(dev), can_id, mask);
543 rl = find_rcv_list(&can_id, &mask, d);
546 * Search the receiver list for the item to delete. This should
547 * exist, since no receiver may be unregistered that hasn't
548 * been registered before.
551 hlist_for_each_entry_rcu(r, next, rl, list) {
552 if (r->can_id == can_id && r->mask == mask
553 && r->func == func && r->data == data)
558 * Check for bugs in CAN protocol implementations:
559 * If no matching list item was found, the list cursor variable next
560 * will be NULL, while r will point to the last item of the list.
564 printk(KERN_ERR "BUG: receive list entry not found for "
565 "dev %s, id %03X, mask %03X\n",
566 DNAME(dev), can_id, mask);
572 hlist_del_rcu(&r->list);
575 if (can_pstats.rcv_entries > 0)
576 can_pstats.rcv_entries--;
578 /* remove device structure requested by NETDEV_UNREGISTER */
579 if (d->remove_on_zero_entries && !d->entries)
580 hlist_del_rcu(&d->list);
585 spin_unlock(&can_rcvlists_lock);
587 /* schedule the receiver item for deletion */
589 call_rcu(&r->rcu, can_rx_delete_receiver);
591 /* schedule the device structure for deletion */
593 call_rcu(&d->rcu, can_rx_delete_device);
595 EXPORT_SYMBOL(can_rx_unregister);
597 static inline void deliver(struct sk_buff *skb, struct receiver *r)
599 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
603 r->func(clone, r->data);
608 static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb)
611 struct hlist_node *n;
613 struct can_frame *cf = (struct can_frame *)skb->data;
614 canid_t can_id = cf->can_id;
619 if (can_id & CAN_ERR_FLAG) {
620 /* check for error frame entries only */
621 hlist_for_each_entry_rcu(r, n, &d->rx[RX_ERR], list) {
622 if (can_id & r->mask) {
630 /* check for unfiltered entries */
631 hlist_for_each_entry_rcu(r, n, &d->rx[RX_ALL], list) {
636 /* check for can_id/mask entries */
637 hlist_for_each_entry_rcu(r, n, &d->rx[RX_FIL], list) {
638 if ((can_id & r->mask) == r->can_id) {
644 /* check for inverted can_id/mask entries */
645 hlist_for_each_entry_rcu(r, n, &d->rx[RX_INV], list) {
646 if ((can_id & r->mask) != r->can_id) {
652 /* check CAN_ID specific entries */
653 if (can_id & CAN_EFF_FLAG) {
654 hlist_for_each_entry_rcu(r, n, &d->rx[RX_EFF], list) {
655 if (r->can_id == can_id) {
661 can_id &= CAN_SFF_MASK;
662 hlist_for_each_entry_rcu(r, n, &d->rx_sff[can_id], list) {
671 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,14)
672 static int can_rcv(struct sk_buff *skb, struct net_device *dev,
673 struct packet_type *pt, struct net_device *orig_dev)
675 static int can_rcv(struct sk_buff *skb, struct net_device *dev,
676 struct packet_type *pt)
679 struct dev_rcv_lists *d;
682 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
683 if (dev->type != ARPHRD_CAN || dev->nd_net != &init_net) {
685 if (dev->type != ARPHRD_CAN) {
691 /* update statistics */
692 can_stats.rx_frames++;
693 can_stats.rx_frames_delta++;
697 /* deliver the packet to sockets listening on all devices */
698 matches = can_rcv_filter(&can_rx_alldev_list, skb);
700 /* find receive list for this device */
701 d = find_dev_rcv_lists(dev);
703 matches += can_rcv_filter(d, skb);
707 /* free the skbuff allocated by the netdevice driver */
712 can_stats.matches_delta++;
719 * af_can protocol functions
723 * can_proto_register - register CAN transport protocol
724 * @cp: pointer to CAN protocol structure
728 * -EINVAL invalid (out of range) protocol number
729 * -EBUSY protocol already in use
730 * -ENOBUF if proto_register() fails
732 int can_proto_register(struct can_proto *cp)
734 int proto = cp->protocol;
737 if (proto < 0 || proto >= CAN_NPROTO) {
738 printk(KERN_ERR "can: protocol number %d out of range\n",
743 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
744 err = proto_register(cp->prot, 0);
749 spin_lock(&proto_tab_lock);
750 if (proto_tab[proto]) {
751 printk(KERN_ERR "can: protocol %d already registered\n",
755 proto_tab[proto] = cp;
757 /* use generic ioctl function if not defined by module */
759 cp->ops->ioctl = can_ioctl;
761 spin_unlock(&proto_tab_lock);
763 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
765 proto_unregister(cp->prot);
770 EXPORT_SYMBOL(can_proto_register);
773 * can_proto_unregister - unregister CAN transport protocol
774 * @cp: pointer to CAN protocol structure
776 void can_proto_unregister(struct can_proto *cp)
778 int proto = cp->protocol;
780 spin_lock(&proto_tab_lock);
781 if (!proto_tab[proto]) {
782 printk(KERN_ERR "BUG: can: protocol %d is not registered\n",
785 proto_tab[proto] = NULL;
786 spin_unlock(&proto_tab_lock);
788 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
789 proto_unregister(cp->prot);
792 EXPORT_SYMBOL(can_proto_unregister);
795 * af_can notifier to create/remove CAN netdevice specific structs
797 static int can_notifier(struct notifier_block *nb, unsigned long msg,
800 struct net_device *dev = (struct net_device *)data;
801 struct dev_rcv_lists *d;
803 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
804 if (dev->nd_net != &init_net)
808 if (dev->type != ARPHRD_CAN)
813 case NETDEV_REGISTER:
816 * create new dev_rcv_lists for this device
818 * N.B. zeroing the struct is the correct initialization
819 * for the embedded hlist_head structs.
820 * Another list type, e.g. list_head, would require
821 * explicit initialization.
824 d = kzalloc(sizeof(*d), GFP_KERNEL);
827 "can: allocation of receive list failed\n");
832 spin_lock(&can_rcvlists_lock);
833 hlist_add_head_rcu(&d->list, &can_rx_dev_list);
834 spin_unlock(&can_rcvlists_lock);
838 case NETDEV_UNREGISTER:
839 spin_lock(&can_rcvlists_lock);
841 d = find_dev_rcv_lists(dev);
844 d->remove_on_zero_entries = 1;
847 hlist_del_rcu(&d->list);
849 printk(KERN_ERR "can: notifier: receive list not "
850 "found for dev %s\n", dev->name);
852 spin_unlock(&can_rcvlists_lock);
855 call_rcu(&d->rcu, can_rx_delete_device);
864 * af_can module init/exit functions
867 static struct packet_type can_packet __read_mostly = {
868 .type = __constant_htons(ETH_P_CAN),
873 static struct net_proto_family can_family_ops __read_mostly = {
875 .create = can_create,
876 .owner = THIS_MODULE,
879 /* notifier block for netdevice event */
880 static struct notifier_block can_netdev_notifier __read_mostly = {
881 .notifier_call = can_notifier,
884 static __init int can_init(void)
888 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
889 rcv_cache = kmem_cache_create("can_receiver", sizeof(struct receiver),
892 rcv_cache = kmem_cache_create("can_receiver", sizeof(struct receiver),
899 * Insert can_rx_alldev_list for reception on all devices.
900 * This struct is zero initialized which is correct for the
901 * embedded hlist heads, the dev pointer, and the entries counter.
904 spin_lock(&can_rcvlists_lock);
905 hlist_add_head_rcu(&can_rx_alldev_list.list, &can_rx_dev_list);
906 spin_unlock(&can_rcvlists_lock);
909 /* the statistics are updated every second (timer triggered) */
910 setup_timer(&can_stattimer, can_stat_update, 0);
911 mod_timer(&can_stattimer, round_jiffies(jiffies + HZ));
913 can_stattimer.function = NULL;
917 /* protocol register */
918 sock_register(&can_family_ops);
919 register_netdevice_notifier(&can_netdev_notifier);
920 dev_add_pack(&can_packet);
925 static __exit void can_exit(void)
927 struct dev_rcv_lists *d;
928 struct hlist_node *n, *next;
931 del_timer(&can_stattimer);
935 /* protocol unregister */
936 dev_remove_pack(&can_packet);
937 unregister_netdevice_notifier(&can_netdev_notifier);
938 sock_unregister(PF_CAN);
940 /* remove can_rx_dev_list */
941 spin_lock(&can_rcvlists_lock);
942 hlist_del(&can_rx_alldev_list.list);
943 hlist_for_each_entry_safe(d, n, next, &can_rx_dev_list, list) {
947 spin_unlock(&can_rcvlists_lock);
949 kmem_cache_destroy(rcv_cache);
952 module_init(can_init);
953 module_exit(can_exit);