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isotp.h
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isotp.h
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/* SPDX-License-Identifier: ((GPL-2.0-only WITH Linux-syscall-note) OR BSD-3-Clause) */
/*
* linux/can/isotp.h
*
* Definitions for isotp CAN sockets (ISO 15765-2:2016)
*
* Copyright (c) 2020 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_ISOTP_H
#define _UAPI_CAN_ISOTP_H
#include <linux/types.h>
#include <linux/can.h>
#define SOL_CAN_ISOTP (SOL_CAN_BASE + CAN_ISOTP)
/* for socket options affecting the socket (not the global system) */
#define CAN_ISOTP_OPTS 1 /* pass struct can_isotp_options */
#define CAN_ISOTP_RECV_FC 2 /* pass struct can_isotp_fc_options */
/* sockopts to force stmin timer values for protocol regression tests */
#define CAN_ISOTP_TX_STMIN 3 /* pass __u32 value in nano secs */
/* use this time instead of value */
/* provided in FC from the receiver */
#define CAN_ISOTP_RX_STMIN 4 /* pass __u32 value in nano secs */
/* ignore received CF frames which */
/* timestamps differ less than val */
#define CAN_ISOTP_LL_OPTS 5 /* pass struct can_isotp_ll_options */
struct can_isotp_options {
__u32 flags; /* set flags for isotp behaviour. */
/* __u32 value : flags see below */
__u32 frame_txtime; /* frame transmission time (N_As/N_Ar) */
/* __u32 value : time in nano secs */
__u8 ext_address; /* set address for extended addressing */
/* __u8 value : extended address */
__u8 txpad_content; /* set content of padding byte (tx) */
/* __u8 value : content on tx path */
__u8 rxpad_content; /* set content of padding byte (rx) */
/* __u8 value : content on rx path */
__u8 rx_ext_address; /* set address for extended addressing */
/* __u8 value : extended address (rx) */
};
struct can_isotp_fc_options {
__u8 bs; /* blocksize provided in FC frame */
/* __u8 value : blocksize. 0 = off */
__u8 stmin; /* separation time provided in FC frame */
/* __u8 value : */
/* 0x00 - 0x7F : 0 - 127 ms */
/* 0x80 - 0xF0 : reserved */
/* 0xF1 - 0xF9 : 100 us - 900 us */
/* 0xFA - 0xFF : reserved */
__u8 wftmax; /* max. number of wait frame transmiss. */
/* __u8 value : 0 = omit FC N_PDU WT */
};
struct can_isotp_ll_options {
__u8 mtu; /* generated & accepted CAN frame type */
/* __u8 value : */
/* CAN_MTU (16) -> standard CAN 2.0 */
/* CANFD_MTU (72) -> CAN FD frame */
__u8 tx_dl; /* tx link layer data length in bytes */
/* (configured maximum payload length) */
/* __u8 value : 8,12,16,20,24,32,48,64 */
/* => rx path supports all LL_DL values */
__u8 tx_flags; /* set into struct canfd_frame.flags */
/* at frame creation: e.g. CANFD_BRS */
/* Obsolete when the BRS flag is fixed */
/* by the CAN netdriver configuration */
};
/* flags for isotp behaviour */
#define CAN_ISOTP_LISTEN_MODE 0x0001 /* listen only (do not send FC) */
#define CAN_ISOTP_EXTEND_ADDR 0x0002 /* enable extended addressing */
#define CAN_ISOTP_TX_PADDING 0x0004 /* enable CAN frame padding tx path */
#define CAN_ISOTP_RX_PADDING 0x0008 /* enable CAN frame padding rx path */
#define CAN_ISOTP_CHK_PAD_LEN 0x0010 /* check received CAN frame padding */
#define CAN_ISOTP_CHK_PAD_DATA 0x0020 /* check received CAN frame padding */
#define CAN_ISOTP_HALF_DUPLEX 0x0040 /* half duplex error state handling */
#define CAN_ISOTP_FORCE_TXSTMIN 0x0080 /* ignore stmin from received FC */
#define CAN_ISOTP_FORCE_RXSTMIN 0x0100 /* ignore CFs depending on rx stmin */
#define CAN_ISOTP_RX_EXT_ADDR 0x0200 /* different rx extended addressing */
#define CAN_ISOTP_WAIT_TX_DONE 0x0400 /* wait for tx completion */
#define CAN_ISOTP_SF_BROADCAST 0x0800 /* 1-to-N functional addressing */
#define CAN_ISOTP_CF_BROADCAST 0x1000 /* 1-to-N transmission w/o FC */
#define CAN_ISOTP_DYN_FC_PARMS 0x2000 /* dynamic FC parameters BS/STmin */
/* protocol machine default values */
#define CAN_ISOTP_DEFAULT_FLAGS 0
#define CAN_ISOTP_DEFAULT_EXT_ADDRESS 0x00
#define CAN_ISOTP_DEFAULT_PAD_CONTENT 0xCC /* prevent bit-stuffing */
#define CAN_ISOTP_DEFAULT_FRAME_TXTIME 50000 /* 50 micro seconds */
#define CAN_ISOTP_DEFAULT_RECV_BS 0
#define CAN_ISOTP_DEFAULT_RECV_STMIN 0x00
#define CAN_ISOTP_DEFAULT_RECV_WFTMAX 0
/*
* Remark on CAN_ISOTP_DEFAULT_RECV_* values:
*
* We can strongly assume, that the Linux Kernel implementation of
* CAN_ISOTP is capable to run with BS=0, STmin=0 and WFTmax=0.
* But as we like to be able to behave as a commonly available ECU,
* these default settings can be changed via sockopts.
* For that reason the STmin value is intentionally _not_ checked for
* consistency and copied directly into the flow control (FC) frame.
*/
/* link layer default values => make use of Classical CAN frames */
#define CAN_ISOTP_DEFAULT_LL_MTU CAN_MTU
#define CAN_ISOTP_DEFAULT_LL_TX_DL CAN_MAX_DLEN
#define CAN_ISOTP_DEFAULT_LL_TX_FLAGS 0
/*
* The CAN_ISOTP_DEFAULT_FRAME_TXTIME has become a non-zero value as
* it only makes sense for isotp implementation tests to run without
* a N_As value. As user space applications usually do not set the
* frame_txtime element of struct can_isotp_options the new in-kernel
* default is very likely overwritten with zero when the sockopt()
* CAN_ISOTP_OPTS is invoked.
* To make sure that a N_As value of zero is only set intentional the
* value '0' is now interpreted as 'do not change the current value'.
* When a frame_txtime of zero is required for testing purposes this
* CAN_ISOTP_FRAME_TXTIME_ZERO u32 value has to be set in frame_txtime.
*/
#define CAN_ISOTP_FRAME_TXTIME_ZERO 0xFFFFFFFF
#endif /* !_UAPI_CAN_ISOTP_H */