1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
2 /*
3  * linux/can/core.h
4  *
5  * Prototypes and definitions for CAN protocol modules using the PF_CAN core
6  *
7  * Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
8  *          Urs Thuermann   <urs.thuermann@volkswagen.de>
9  * Copyright (c) 2002-2017 Volkswagen Group Electronic Research
10  * All rights reserved.
11  *
12  */
13 
14 #ifndef _CAN_CORE_H
15 #define _CAN_CORE_H
16 
17 #include <linux/can.h>
18 #include <linux/skbuff.h>
19 #include <linux/netdevice.h>
20 
21 #define DNAME(dev) ((dev) ? (dev)->name : "any")
22 
23 /**
24  * struct can_proto - CAN protocol structure
25  * @type:       type argument in socket() syscall, e.g. SOCK_DGRAM.
26  * @protocol:   protocol number in socket() syscall.
27  * @ops:        pointer to struct proto_ops for sock->ops.
28  * @prot:       pointer to struct proto structure.
29  */
30 struct can_proto {
31 	int type;
32 	int protocol;
33 	const struct proto_ops *ops;
34 	struct proto *prot;
35 };
36 
37 /* required_size
38  * macro to find the minimum size of a struct
39  * that includes a requested member
40  */
41 #define CAN_REQUIRED_SIZE(struct_type, member) \
42 	(offsetof(typeof(struct_type), member) + \
43 	 sizeof(((typeof(struct_type) *)(NULL))->member))
44 
45 /* function prototypes for the CAN networklayer core (af_can.c) */
46 
47 extern int  can_proto_register(const struct can_proto *cp);
48 extern void can_proto_unregister(const struct can_proto *cp);
49 
50 int can_rx_register(struct net *net, struct net_device *dev,
51 		    canid_t can_id, canid_t mask,
52 		    void (*func)(struct sk_buff *, void *),
53 		    void *data, char *ident, struct sock *sk);
54 
55 extern void can_rx_unregister(struct net *net, struct net_device *dev,
56 			      canid_t can_id, canid_t mask,
57 			      void (*func)(struct sk_buff *, void *),
58 			      void *data);
59 
60 extern int can_send(struct sk_buff *skb, int loop);
61 void can_sock_destruct(struct sock *sk);
62 
63 #endif /* !_CAN_CORE_H */
64