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The size of this structure will be increased with J1939 support. To stay binary compatible, the CAN_REQUIRED_SIZE macro is introduced for existing CAN protocols. Signed-off-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
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/*
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* linux/can/core.h
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*
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* Protoypes and definitions for CAN protocol modules using the PF_CAN core
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*
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* Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
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* Urs Thuermann <urs.thuermann@volkswagen.de>
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* Copyright (c) 2002-2017 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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*/
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#ifndef _CAN_CORE_H
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#define _CAN_CORE_H
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#include <linux/can.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#define CAN_VERSION "20170425"
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/* increment this number each time you change some user-space interface */
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#define CAN_ABI_VERSION "9"
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#define CAN_VERSION_STRING "rev " CAN_VERSION " abi " CAN_ABI_VERSION
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#define DNAME(dev) ((dev) ? (dev)->name : "any")
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/**
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* struct can_proto - CAN protocol structure
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* @type: type argument in socket() syscall, e.g. SOCK_DGRAM.
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* @protocol: protocol number in socket() syscall.
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* @ops: pointer to struct proto_ops for sock->ops.
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* @prot: pointer to struct proto structure.
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*/
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struct can_proto {
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int type;
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int protocol;
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const struct proto_ops *ops;
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struct proto *prot;
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};
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/* required_size
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* macro to find the minimum size of a struct
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* that includes a requested member
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*/
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#define CAN_REQUIRED_SIZE(struct_type, member) \
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(offsetof(typeof(struct_type), member) + \
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sizeof(((typeof(struct_type) *)(NULL))->member))
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/* function prototypes for the CAN networklayer core (af_can.c) */
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extern int can_proto_register(const struct can_proto *cp);
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extern void can_proto_unregister(const struct can_proto *cp);
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int can_rx_register(struct net *net, struct net_device *dev,
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canid_t can_id, canid_t mask,
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void (*func)(struct sk_buff *, void *),
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void *data, char *ident, struct sock *sk);
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extern void can_rx_unregister(struct net *net, struct net_device *dev,
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canid_t can_id, canid_t mask,
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void (*func)(struct sk_buff *, void *),
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void *data);
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extern int can_send(struct sk_buff *skb, int loop);
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#endif /* !_CAN_CORE_H */
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