/* 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 _CAN_ISOTP_H #define _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 */ /* 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 */