2 /* af_can.c - Protocol family CAN core module
3  *            (used by different CAN protocol modules)
58 #include <linux/can.h>
59 #include <linux/can/core.h>
60 #include <linux/can/skb.h>
61 #include <linux/can/can-ml.h>
81 /* table of registered CAN protocols */
132 		err = request_module("can-proto-%d", protocol);  in can_create()
139 			pr_err_ratelimited("can: request_module (can-proto-%d) failed.\n",  in can_create()
187  * can_send - transmit a CAN frame (optional with local loopback)
188  * @skb: pointer to socket buffer with CAN frame in data section
189  * @loop: loopback for listeners on local CAN sockets (recommended default!)
198  *  -EPERM when trying to send on a non-CAN interface
199  *  -EMSGSIZE CAN frame size is bigger than CAN interface MTU
200  *  -EINVAL when the skb->data does not contain a valid CAN frame
205 	struct can_pkg_stats *pkg_stats = dev_net(skb->dev)->can.pkg_stats;  in can_send()
217 		/* set CAN FD flag for CAN FD frames by default */  in can_send()
223 	/* Make sure the CAN frame can pass the selected CAN netdevice. */  in can_send()
246 		/* local loopback of sent CAN frames */  in can_send()
248 		/* indication for the CAN driver: do loopback */  in can_send()
274 		/* indication for the CAN driver: no loopback required */  in can_send()
312 		return net->can.rx_alldev_list;  in can_dev_rcv_lists_find()
317  * effhash - hash function for 29 bit CAN identifier reduction
318  * @can_id: 29 bit CAN identifier
321  *  To reduce the linear traversal in one linked list of _single_ EFF CAN
341  * @can_id: pointer to CAN identifier of a given can_filter
342  * @mask: pointer to CAN mask of a given can_filter
357  *  The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
414  * can_rx_register - subscribe CAN frames from a specific interface
416  * @dev: pointer to netdevice (NULL => subscribe from 'all' CAN devices list)
417  * @can_id: CAN identifier (see description)
418  * @mask: CAN mask (see description)
430  *  The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
451 	struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;  in can_rx_register()
465 	spin_lock_bh(&net->can.rcvlists_lock);  in can_rx_register()
484 	spin_unlock_bh(&net->can.rcvlists_lock);  in can_rx_register()
502  * can_rx_unregister - unsubscribe CAN frames from a specific interface
504  * @dev: pointer to netdevice (NULL => unsubscribe from 'all' CAN devices list)
505  * @can_id: CAN identifier
506  * @mask: CAN mask
519 	struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;  in can_rx_unregister()
528 	spin_lock_bh(&net->can.rcvlists_lock);  in can_rx_unregister()
543 	/* Check for bugs in CAN protocol implementations using af_can.c:  in can_rx_unregister()
546 	 * the notifier for removing the CAN netdev is running we just print  in can_rx_unregister()
550 		pr_warn("can: receive list entry not found for dev %s, id %03X, mask %03X\n",  in can_rx_unregister()
562 	spin_unlock_bh(&net->can.rcvlists_lock);  in can_rx_unregister()
648 	struct can_pkg_stats *pkg_stats = net->can.pkg_stats;  in can_receive()
662 	matches = can_rcv_filter(net->can.rx_alldev_list, skb);  in can_receive()
683 		pr_warn_once("PF_CAN: dropped non conform CAN skbuff: dev type %d, len %d\n",  in can_rcv()
698 		pr_warn_once("PF_CAN: dropped non conform CAN FD skbuff: dev type %d, len %d\n",  in canfd_rcv()
713 		pr_warn_once("PF_CAN: dropped non conform CAN XL skbuff: dev type %d, len %d\n",  in canxl_rcv()
727  * can_proto_register - register CAN transport protocol
728  * @cp: pointer to CAN protocol structure
742 		pr_err("can: protocol number %d out of range\n", proto);  in can_proto_register()
753 		pr_err("can: protocol %d already registered\n", proto);  in can_proto_register()
769  * can_proto_unregister - unregister CAN transport protocol
770  * @cp: pointer to CAN protocol structure
789 	spin_lock_init(&net->can.rcvlists_lock);  in can_pernet_init()
790 	net->can.rx_alldev_list =  in can_pernet_init()
791 		kzalloc(sizeof(*net->can.rx_alldev_list), GFP_KERNEL);  in can_pernet_init()
792 	if (!net->can.rx_alldev_list)  in can_pernet_init()
794 	net->can.pkg_stats = kzalloc(sizeof(*net->can.pkg_stats), GFP_KERNEL);  in can_pernet_init()
795 	if (!net->can.pkg_stats)  in can_pernet_init()
797 	net->can.rcv_lists_stats = kzalloc(sizeof(*net->can.rcv_lists_stats), GFP_KERNEL);  in can_pernet_init()
798 	if (!net->can.rcv_lists_stats)  in can_pernet_init()
804 			timer_setup(&net->can.stattimer, can_stat_update,  in can_pernet_init()
806 			mod_timer(&net->can.stattimer,  in can_pernet_init()
809 		net->can.pkg_stats->jiffies_init = jiffies;  in can_pernet_init()
816 	kfree(net->can.pkg_stats);  in can_pernet_init()
818 	kfree(net->can.rx_alldev_list);  in can_pernet_init()
828 			timer_delete_sync(&net->can.stattimer);  in can_pernet_exit()
831 	kfree(net->can.rx_alldev_list);  in can_pernet_exit()
832 	kfree(net->can.pkg_stats);  in can_pernet_exit()
833 	kfree(net->can.rcv_lists_stats);  in can_pernet_exit()
876 	pr_info("can: controller area network core\n");  in can_init()