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()
184  * can_send - transmit a CAN frame (optional with local loopback)
185  * @skb: pointer to socket buffer with CAN frame in data section
186  * @loop: loopback for listeners on local CAN sockets (recommended default!)
195  *  -EPERM when trying to send on a non-CAN interface
196  *  -EMSGSIZE CAN frame size is bigger than CAN interface MTU
197  *  -EINVAL when the skb->data does not contain a valid CAN frame
203 	struct can_pkg_stats *pkg_stats = dev_net(skb->dev)->can.pkg_stats;  in can_send()
218 	/* Make sure the CAN frame can pass the selected CAN netdevice.  in can_send()
219 	 * As structs can_frame and canfd_frame are similar, we can provide  in can_send()
220 	 * CAN FD frames to legacy CAN drivers as long as the length is <= 8  in can_send()
244 		/* local loopback of sent CAN frames */  in can_send()
246 		/* indication for the CAN driver: do loopback */  in can_send()
272 		/* indication for the CAN driver: no loopback required */  in can_send()
310 		return net->can.rx_alldev_list;  in can_dev_rcv_lists_find()
315  * effhash - hash function for 29 bit CAN identifier reduction
316  * @can_id: 29 bit CAN identifier
319  *  To reduce the linear traversal in one linked list of _single_ EFF CAN
339  * @can_id: pointer to CAN identifier of a given can_filter
340  * @mask: pointer to CAN mask of a given can_filter
355  *  The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
412  * can_rx_register - subscribe CAN frames from a specific interface
414  * @dev: pointer to netdevice (NULL => subscribe from 'all' CAN devices list)
415  * @can_id: CAN identifier (see description)
416  * @mask: CAN mask (see description)
428  *  The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
449 	struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;  in can_rx_register()
464 	spin_lock_bh(&net->can.rcvlists_lock);  in can_rx_register()
483 	spin_unlock_bh(&net->can.rcvlists_lock);  in can_rx_register()
501  * can_rx_unregister - unsubscribe CAN frames from a specific interface
503  * @dev: pointer to netdevice (NULL => unsubscribe from 'all' CAN devices list)
504  * @can_id: CAN identifier
505  * @mask: CAN mask
518 	struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;  in can_rx_unregister()
527 	spin_lock_bh(&net->can.rcvlists_lock);  in can_rx_unregister()
542 	/* Check for bugs in CAN protocol implementations using af_can.c:  in can_rx_unregister()
545 	 * the notifier for removing the CAN netdev is running we just print  in can_rx_unregister()
549 		pr_warn("can: receive list entry not found for dev %s, id %03X, mask %03X\n",  in can_rx_unregister()
561 	spin_unlock_bh(&net->can.rcvlists_lock);  in can_rx_unregister()
647 	struct can_pkg_stats *pkg_stats = net->can.pkg_stats;  in can_receive()
661 	matches = can_rcv_filter(net->can.rx_alldev_list, skb);  in can_receive()
684 		pr_warn_once("PF_CAN: dropped non conform CAN skbuff: dev type %d, len %d\n",  in can_rcv()
691 		pr_warn_once("PF_CAN: dropped non conform CAN skbuff: dev type %d, len %d, datalen %d\n",  in can_rcv()
710 		pr_warn_once("PF_CAN: dropped non conform CAN FD skbuff: dev type %d, len %d\n",  in canfd_rcv()
717 		pr_warn_once("PF_CAN: dropped non conform CAN FD skbuff: dev type %d, len %d, datalen %d\n",  in canfd_rcv()
733  * can_proto_register - register CAN transport protocol
734  * @cp: pointer to CAN protocol structure
748 		pr_err("can: protocol number %d out of range\n", proto);  in can_proto_register()
759 		pr_err("can: protocol %d already registered\n", proto);  in can_proto_register()
775  * can_proto_unregister - unregister CAN transport protocol
776  * @cp: pointer to CAN protocol structure
793 /* af_can notifier to create/remove CAN netdevice specific structs */
805 		     "No CAN mid layer private allocated, please fix your driver and use alloc_candev()!\n");  in can_notifier()
814 	spin_lock_init(&net->can.rcvlists_lock);  in can_pernet_init()
815 	net->can.rx_alldev_list =  in can_pernet_init()
816 		kzalloc(sizeof(*net->can.rx_alldev_list), GFP_KERNEL);  in can_pernet_init()
817 	if (!net->can.rx_alldev_list)  in can_pernet_init()
819 	net->can.pkg_stats = kzalloc(sizeof(*net->can.pkg_stats), GFP_KERNEL);  in can_pernet_init()
820 	if (!net->can.pkg_stats)  in can_pernet_init()
822 	net->can.rcv_lists_stats = kzalloc(sizeof(*net->can.rcv_lists_stats), GFP_KERNEL);  in can_pernet_init()
823 	if (!net->can.rcv_lists_stats)  in can_pernet_init()
829 			timer_setup(&net->can.stattimer, can_stat_update,  in can_pernet_init()
831 			mod_timer(&net->can.stattimer,  in can_pernet_init()
834 		net->can.pkg_stats->jiffies_init = jiffies;  in can_pernet_init()
841 	kfree(net->can.pkg_stats);  in can_pernet_init()
843 	kfree(net->can.rx_alldev_list);  in can_pernet_init()
853 			del_timer_sync(&net->can.stattimer);  in can_pernet_exit()
856 	kfree(net->can.rx_alldev_list);  in can_pernet_exit()
857 	kfree(net->can.pkg_stats);  in can_pernet_exit()
858 	kfree(net->can.rcv_lists_stats);  in can_pernet_exit()
899 	pr_info("can: controller area network core\n");  in can_init()