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Release 4.12 include/uapi/linux/can.h

/*
 * linux/can.h
 *
 * Definitions for CAN network layer (socket addr / CAN frame / CAN filter)
 *
 * Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
 *          Urs Thuermann   <urs.thuermann@volkswagen.de>
 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Volkswagen nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2, in which case the provisions of the
 * GPL apply INSTEAD OF those given above.
 *
 * The provided data structures and external interfaces from this code
 * are not restricted to be used by modules with a GPL compatible license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#ifndef _UAPI_CAN_H

#define _UAPI_CAN_H

#include <linux/types.h>
#include <linux/socket.h>

/* controller area network (CAN) kernel definitions */

/* special address description flags for the CAN_ID */

#define CAN_EFF_FLAG 0x80000000U 
/* EFF/SFF is set in the MSB */

#define CAN_RTR_FLAG 0x40000000U 
/* remote transmission request */

#define CAN_ERR_FLAG 0x20000000U 
/* error message frame */

/* valid bits in CAN ID for frame formats */

#define CAN_SFF_MASK 0x000007FFU 
/* standard frame format (SFF) */

#define CAN_EFF_MASK 0x1FFFFFFFU 
/* extended frame format (EFF) */

#define CAN_ERR_MASK 0x1FFFFFFFU 
/* omit EFF, RTR, ERR flags */

/*
 * Controller Area Network Identifier structure
 *
 * bit 0-28     : CAN identifier (11/29 bit)
 * bit 29       : error message frame flag (0 = data frame, 1 = error message)
 * bit 30       : remote transmission request flag (1 = rtr frame)
 * bit 31       : frame format flag (0 = standard 11 bit, 1 = extended 29 bit)
 */

typedef __u32 canid_t;


#define CAN_SFF_ID_BITS		11

#define CAN_EFF_ID_BITS		29

/*
 * Controller Area Network Error Message Frame Mask structure
 *
 * bit 0-28     : error class mask (see include/linux/can/error.h)
 * bit 29-31    : set to zero
 */

typedef __u32 can_err_mask_t;

/* CAN payload length and DLC definitions according to ISO 11898-1 */

#define CAN_MAX_DLC 8

#define CAN_MAX_DLEN 8

/* CAN FD payload length and DLC definitions according to ISO 11898-7 */

#define CANFD_MAX_DLC 15

#define CANFD_MAX_DLEN 64

/**
 * struct can_frame - basic CAN frame structure
 * @can_id:  CAN ID of the frame and CAN_*_FLAG flags, see canid_t definition
 * @can_dlc: frame payload length in byte (0 .. 8) aka data length code
 *           N.B. the DLC field from ISO 11898-1 Chapter 8.4.2.3 has a 1:1
 *           mapping of the 'data length code' to the real payload length
 * @__pad:   padding
 * @__res0:  reserved / padding
 * @__res1:  reserved / padding
 * @data:    CAN frame payload (up to 8 byte)
 */

struct can_frame {
	
canid_t can_id;  /* 32 bit CAN_ID + EFF/RTR/ERR flags */
	
__u8    can_dlc; /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
	
__u8    __pad;   /* padding */
	
__u8    __res0;  /* reserved / padding */
	
__u8    __res1;  /* reserved / padding */
	
__u8    data[CAN_MAX_DLEN] __attribute__((aligned(8)));
};

/*
 * defined bits for canfd_frame.flags
 *
 * The use of struct canfd_frame implies the Extended Data Length (EDL) bit to
 * be set in the CAN frame bitstream on the wire. The EDL bit switch turns
 * the CAN controllers bitstream processor into the CAN FD mode which creates
 * two new options within the CAN FD frame specification:
 *
 * Bit Rate Switch - to indicate a second bitrate is/was used for the payload
 * Error State Indicator - represents the error state of the transmitting node
 *
 * As the CANFD_ESI bit is internally generated by the transmitting CAN
 * controller only the CANFD_BRS bit is relevant for real CAN controllers when
 * building a CAN FD frame for transmission. Setting the CANFD_ESI bit can make
 * sense for virtual CAN interfaces to test applications with echoed frames.
 */

#define CANFD_BRS 0x01 
/* bit rate switch (second bitrate for payload data) */

#define CANFD_ESI 0x02 
/* error state indicator of the transmitting node */

/**
 * struct canfd_frame - CAN flexible data rate frame structure
 * @can_id: CAN ID of the frame and CAN_*_FLAG flags, see canid_t definition
 * @len:    frame payload length in byte (0 .. CANFD_MAX_DLEN)
 * @flags:  additional flags for CAN FD
 * @__res0: reserved / padding
 * @__res1: reserved / padding
 * @data:   CAN FD frame payload (up to CANFD_MAX_DLEN byte)
 */

struct canfd_frame {
	
canid_t can_id;  /* 32 bit CAN_ID + EFF/RTR/ERR flags */
	
__u8    len;     /* frame payload length in byte */
	
__u8    flags;   /* additional flags for CAN FD */
	
__u8    __res0;  /* reserved / padding */
	
__u8    __res1;  /* reserved / padding */
	
__u8    data[CANFD_MAX_DLEN] __attribute__((aligned(8)));
};


#define CAN_MTU		(sizeof(struct can_frame))

#define CANFD_MTU	(sizeof(struct canfd_frame))

/* particular protocols of the protocol family PF_CAN */

#define CAN_RAW		1 
/* RAW sockets */

#define CAN_BCM		2 
/* Broadcast Manager */

#define CAN_TP16	3 
/* VAG Transport Protocol v1.6 */

#define CAN_TP20	4 
/* VAG Transport Protocol v2.0 */

#define CAN_MCNET	5 
/* Bosch MCNet */

#define CAN_ISOTP	6 
/* ISO 15765-2 Transport Protocol */

#define CAN_NPROTO	7


#define SOL_CAN_BASE 100

/**
 * struct sockaddr_can - the sockaddr structure for CAN sockets
 * @can_family:  address family number AF_CAN.
 * @can_ifindex: CAN network interface index.
 * @can_addr:    protocol specific address information
 */

struct sockaddr_can {
	
__kernel_sa_family_t can_family;
	
int         can_ifindex;
	union {
		/* transport protocol class address information (e.g. ISOTP) */
		


struct { canid_t rx_id, tx_id; } tp;

		/* reserved for future CAN protocols address information */
	
} can_addr;
};

/**
 * struct can_filter - CAN ID based filter in can_register().
 * @can_id:   relevant bits of CAN ID which are not masked out.
 * @can_mask: CAN mask (see description)
 *
 * Description:
 * A filter matches, when
 *
 *          <received_can_id> & mask == can_id & mask
 *
 * The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
 * filter for error message frames (CAN_ERR_FLAG bit set in mask).
 */

struct can_filter {
	
canid_t can_id;
	
canid_t can_mask;
};


#define CAN_INV_FILTER 0x20000000U 
/* to be set in can_filter.can_id */

#define CAN_RAW_FILTER_MAX 512 
/* maximum number of can_filter set via setsockopt() */

#endif /* !_UAPI_CAN_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Oliver Hartkopp24889.86%550.00%
Shawn Landden134.71%110.00%
Rostislav Lisovy82.90%110.00%
Marc Kleine-Budde51.81%110.00%
Ben Hutchings10.36%110.00%
Uwe Kleine-König10.36%110.00%
Total276100.00%10100.00%
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