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e2be04c7f9
Many user space API headers have licensing information, which is either
incomplete, badly formatted or just a shorthand for referring to the
license under which the file is supposed to be. This makes it hard for
compliance tools to determine the correct license.
Update these files with an SPDX license identifier. The identifier was
chosen based on the license information in the file.
GPL/LGPL licensed headers get the matching GPL/LGPL SPDX license
identifier with the added 'WITH Linux-syscall-note' exception, which is
the officially assigned exception identifier for the kernel syscall
exception:
NOTE! This copyright does *not* cover user programs that use kernel
services by normal system calls - this is merely considered normal use
of the kernel, and does *not* fall under the heading of "derived work".
This exception makes it possible to include GPL headers into non GPL
code, without confusing license compliance tools.
Headers which have either explicit dual licensing or are just licensed
under a non GPL license are updated with the corresponding SPDX
identifier and the GPLv2 with syscall exception identifier. The format
is:
((GPL-2.0 WITH Linux-syscall-note) OR SPDX-ID-OF-OTHER-LICENSE)
SPDX license identifiers are a legally binding shorthand, which can be
used instead of the full boiler plate text. The update does not remove
existing license information as this has to be done on a case by case
basis and the copyright holders might have to be consulted. This will
happen in a separate step.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne. See the previous patch in this series for the
methodology of how this patch was researched.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
203 lines
7.7 KiB
C
203 lines
7.7 KiB
C
/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
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/*
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* linux/can.h
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*
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* Definitions for CAN network layer (socket addr / CAN frame / CAN filter)
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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) 2002-2007 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Volkswagen nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* The provided data structures and external interfaces from this code
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* are not restricted to be used by modules with a GPL compatible license.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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#ifndef _UAPI_CAN_H
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#define _UAPI_CAN_H
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#include <linux/types.h>
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#include <linux/socket.h>
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/* controller area network (CAN) kernel definitions */
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/* special address description flags for the CAN_ID */
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#define CAN_EFF_FLAG 0x80000000U /* EFF/SFF is set in the MSB */
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#define CAN_RTR_FLAG 0x40000000U /* remote transmission request */
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#define CAN_ERR_FLAG 0x20000000U /* error message frame */
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/* valid bits in CAN ID for frame formats */
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#define CAN_SFF_MASK 0x000007FFU /* standard frame format (SFF) */
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#define CAN_EFF_MASK 0x1FFFFFFFU /* extended frame format (EFF) */
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#define CAN_ERR_MASK 0x1FFFFFFFU /* omit EFF, RTR, ERR flags */
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/*
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* Controller Area Network Identifier structure
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*
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* bit 0-28 : CAN identifier (11/29 bit)
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* bit 29 : error message frame flag (0 = data frame, 1 = error message)
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* bit 30 : remote transmission request flag (1 = rtr frame)
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* bit 31 : frame format flag (0 = standard 11 bit, 1 = extended 29 bit)
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*/
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typedef __u32 canid_t;
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#define CAN_SFF_ID_BITS 11
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#define CAN_EFF_ID_BITS 29
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/*
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* Controller Area Network Error Message Frame Mask structure
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*
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* bit 0-28 : error class mask (see include/linux/can/error.h)
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* bit 29-31 : set to zero
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*/
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typedef __u32 can_err_mask_t;
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/* CAN payload length and DLC definitions according to ISO 11898-1 */
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#define CAN_MAX_DLC 8
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#define CAN_MAX_DLEN 8
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/* CAN FD payload length and DLC definitions according to ISO 11898-7 */
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#define CANFD_MAX_DLC 15
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#define CANFD_MAX_DLEN 64
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/**
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* struct can_frame - basic CAN frame structure
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* @can_id: CAN ID of the frame and CAN_*_FLAG flags, see canid_t definition
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* @can_dlc: frame payload length in byte (0 .. 8) aka data length code
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* N.B. the DLC field from ISO 11898-1 Chapter 8.4.2.3 has a 1:1
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* mapping of the 'data length code' to the real payload length
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* @__pad: padding
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* @__res0: reserved / padding
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* @__res1: reserved / padding
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* @data: CAN frame payload (up to 8 byte)
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*/
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struct can_frame {
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canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
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__u8 can_dlc; /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
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__u8 __pad; /* padding */
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__u8 __res0; /* reserved / padding */
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__u8 __res1; /* reserved / padding */
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__u8 data[CAN_MAX_DLEN] __attribute__((aligned(8)));
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};
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/*
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* defined bits for canfd_frame.flags
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*
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* The use of struct canfd_frame implies the Extended Data Length (EDL) bit to
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* be set in the CAN frame bitstream on the wire. The EDL bit switch turns
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* the CAN controllers bitstream processor into the CAN FD mode which creates
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* two new options within the CAN FD frame specification:
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*
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* Bit Rate Switch - to indicate a second bitrate is/was used for the payload
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* Error State Indicator - represents the error state of the transmitting node
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*
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* As the CANFD_ESI bit is internally generated by the transmitting CAN
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* controller only the CANFD_BRS bit is relevant for real CAN controllers when
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* building a CAN FD frame for transmission. Setting the CANFD_ESI bit can make
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* sense for virtual CAN interfaces to test applications with echoed frames.
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*/
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#define CANFD_BRS 0x01 /* bit rate switch (second bitrate for payload data) */
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#define CANFD_ESI 0x02 /* error state indicator of the transmitting node */
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/**
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* struct canfd_frame - CAN flexible data rate frame structure
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* @can_id: CAN ID of the frame and CAN_*_FLAG flags, see canid_t definition
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* @len: frame payload length in byte (0 .. CANFD_MAX_DLEN)
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* @flags: additional flags for CAN FD
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* @__res0: reserved / padding
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* @__res1: reserved / padding
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* @data: CAN FD frame payload (up to CANFD_MAX_DLEN byte)
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*/
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struct canfd_frame {
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canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
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__u8 len; /* frame payload length in byte */
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__u8 flags; /* additional flags for CAN FD */
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__u8 __res0; /* reserved / padding */
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__u8 __res1; /* reserved / padding */
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__u8 data[CANFD_MAX_DLEN] __attribute__((aligned(8)));
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};
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#define CAN_MTU (sizeof(struct can_frame))
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#define CANFD_MTU (sizeof(struct canfd_frame))
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/* particular protocols of the protocol family PF_CAN */
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#define CAN_RAW 1 /* RAW sockets */
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#define CAN_BCM 2 /* Broadcast Manager */
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#define CAN_TP16 3 /* VAG Transport Protocol v1.6 */
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#define CAN_TP20 4 /* VAG Transport Protocol v2.0 */
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#define CAN_MCNET 5 /* Bosch MCNet */
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#define CAN_ISOTP 6 /* ISO 15765-2 Transport Protocol */
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#define CAN_NPROTO 7
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#define SOL_CAN_BASE 100
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/**
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* struct sockaddr_can - the sockaddr structure for CAN sockets
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* @can_family: address family number AF_CAN.
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* @can_ifindex: CAN network interface index.
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* @can_addr: protocol specific address information
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*/
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struct sockaddr_can {
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__kernel_sa_family_t can_family;
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int can_ifindex;
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union {
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/* transport protocol class address information (e.g. ISOTP) */
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struct { canid_t rx_id, tx_id; } tp;
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/* reserved for future CAN protocols address information */
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} can_addr;
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};
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/**
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* struct can_filter - CAN ID based filter in can_register().
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* @can_id: relevant bits of CAN ID which are not masked out.
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* @can_mask: CAN mask (see description)
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*
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* Description:
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* A filter matches, when
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*
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* <received_can_id> & mask == can_id & mask
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*
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* The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
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* filter for error message frames (CAN_ERR_FLAG bit set in mask).
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*/
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struct can_filter {
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canid_t can_id;
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canid_t can_mask;
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};
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#define CAN_INV_FILTER 0x20000000U /* to be set in can_filter.can_id */
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#define CAN_RAW_FILTER_MAX 512 /* maximum number of can_filter set via setsockopt() */
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#endif /* !_UAPI_CAN_H */
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