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222 lines
7.8 KiB
222 lines
7.8 KiB
/* SPDX-License-Identifier: ((GPL-2.0-only WITH Linux-syscall-note) OR BSD-3-Clause) */ |
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/* |
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* linux/can/gw.h |
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* |
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* Definitions for CAN frame Gateway/Router/Bridge |
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* |
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* Author: Oliver Hartkopp <[email protected]> |
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* Copyright (c) 2011 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_GW_H |
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#define _UAPI_CAN_GW_H |
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#include <linux/types.h> |
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#include <linux/can.h> |
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struct rtcanmsg { |
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__u8 can_family; |
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__u8 gwtype; |
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__u16 flags; |
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}; |
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/* CAN gateway types */ |
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enum { |
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CGW_TYPE_UNSPEC, |
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CGW_TYPE_CAN_CAN, /* CAN->CAN routing */ |
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__CGW_TYPE_MAX |
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}; |
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#define CGW_TYPE_MAX (__CGW_TYPE_MAX - 1) |
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/* CAN rtnetlink attribute definitions */ |
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enum { |
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CGW_UNSPEC, |
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CGW_MOD_AND, /* CAN frame modification binary AND */ |
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CGW_MOD_OR, /* CAN frame modification binary OR */ |
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CGW_MOD_XOR, /* CAN frame modification binary XOR */ |
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CGW_MOD_SET, /* CAN frame modification set alternate values */ |
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CGW_CS_XOR, /* set data[] XOR checksum into data[index] */ |
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CGW_CS_CRC8, /* set data[] CRC8 checksum into data[index] */ |
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CGW_HANDLED, /* number of handled CAN frames */ |
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CGW_DROPPED, /* number of dropped CAN frames */ |
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CGW_SRC_IF, /* ifindex of source network interface */ |
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CGW_DST_IF, /* ifindex of destination network interface */ |
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CGW_FILTER, /* specify struct can_filter on source CAN device */ |
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CGW_DELETED, /* number of deleted CAN frames (see max_hops param) */ |
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CGW_LIM_HOPS, /* limit the number of hops of this specific rule */ |
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CGW_MOD_UID, /* user defined identifier for modification updates */ |
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CGW_FDMOD_AND, /* CAN FD frame modification binary AND */ |
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CGW_FDMOD_OR, /* CAN FD frame modification binary OR */ |
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CGW_FDMOD_XOR, /* CAN FD frame modification binary XOR */ |
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CGW_FDMOD_SET, /* CAN FD frame modification set alternate values */ |
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__CGW_MAX |
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}; |
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#define CGW_MAX (__CGW_MAX - 1) |
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#define CGW_FLAGS_CAN_ECHO 0x01 |
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#define CGW_FLAGS_CAN_SRC_TSTAMP 0x02 |
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#define CGW_FLAGS_CAN_IIF_TX_OK 0x04 |
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#define CGW_FLAGS_CAN_FD 0x08 |
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#define CGW_MOD_FUNCS 4 /* AND OR XOR SET */ |
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/* CAN frame elements that are affected by curr. 3 CAN frame modifications */ |
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#define CGW_MOD_ID 0x01 |
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#define CGW_MOD_DLC 0x02 /* Classical CAN data length code */ |
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#define CGW_MOD_LEN CGW_MOD_DLC /* CAN FD (plain) data length */ |
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#define CGW_MOD_DATA 0x04 |
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#define CGW_MOD_FLAGS 0x08 /* CAN FD flags */ |
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#define CGW_FRAME_MODS 4 /* ID DLC/LEN DATA FLAGS */ |
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#define MAX_MODFUNCTIONS (CGW_MOD_FUNCS * CGW_FRAME_MODS) |
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struct cgw_frame_mod { |
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struct can_frame cf; |
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__u8 modtype; |
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} __attribute__((packed)); |
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struct cgw_fdframe_mod { |
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struct canfd_frame cf; |
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__u8 modtype; |
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} __attribute__((packed)); |
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#define CGW_MODATTR_LEN sizeof(struct cgw_frame_mod) |
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#define CGW_FDMODATTR_LEN sizeof(struct cgw_fdframe_mod) |
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struct cgw_csum_xor { |
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__s8 from_idx; |
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__s8 to_idx; |
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__s8 result_idx; |
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__u8 init_xor_val; |
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} __attribute__((packed)); |
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struct cgw_csum_crc8 { |
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__s8 from_idx; |
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__s8 to_idx; |
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__s8 result_idx; |
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__u8 init_crc_val; |
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__u8 final_xor_val; |
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__u8 crctab[256]; |
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__u8 profile; |
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__u8 profile_data[20]; |
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} __attribute__((packed)); |
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/* length of checksum operation parameters. idx = index in CAN frame data[] */ |
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#define CGW_CS_XOR_LEN sizeof(struct cgw_csum_xor) |
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#define CGW_CS_CRC8_LEN sizeof(struct cgw_csum_crc8) |
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/* CRC8 profiles (compute CRC for additional data elements - see below) */ |
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enum { |
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CGW_CRC8PRF_UNSPEC, |
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CGW_CRC8PRF_1U8, /* compute one additional u8 value */ |
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CGW_CRC8PRF_16U8, /* u8 value table indexed by data[1] & 0xF */ |
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CGW_CRC8PRF_SFFID_XOR, /* (can_id & 0xFF) ^ (can_id >> 8 & 0xFF) */ |
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__CGW_CRC8PRF_MAX |
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}; |
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#define CGW_CRC8PRF_MAX (__CGW_CRC8PRF_MAX - 1) |
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/* |
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* CAN rtnetlink attribute contents in detail |
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* |
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* CGW_XXX_IF (length 4 bytes): |
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* Sets an interface index for source/destination network interfaces. |
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* For the CAN->CAN gwtype the indices of _two_ CAN interfaces are mandatory. |
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* |
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* CGW_FILTER (length 8 bytes): |
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* Sets a CAN receive filter for the gateway job specified by the |
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* struct can_filter described in include/linux/can.h |
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* |
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* CGW_MOD_(AND|OR|XOR|SET) (length 17 bytes): |
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* Specifies a modification that's done to a received CAN frame before it is |
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* send out to the destination interface. |
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* |
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* <struct can_frame> data used as operator |
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* <u8> affected CAN frame elements |
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* |
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* CGW_LIM_HOPS (length 1 byte): |
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* Limit the number of hops of this specific rule. Usually the received CAN |
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* frame can be processed as much as 'max_hops' times (which is given at module |
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* load time of the can-gw module). This value is used to reduce the number of |
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* possible hops for this gateway rule to a value smaller then max_hops. |
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* |
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* CGW_MOD_UID (length 4 bytes): |
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* Optional non-zero user defined routing job identifier to alter existing |
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* modification settings at runtime. |
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* |
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* CGW_CS_XOR (length 4 bytes): |
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* Set a simple XOR checksum starting with an initial value into |
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* data[result-idx] using data[start-idx] .. data[end-idx] |
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* |
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* The XOR checksum is calculated like this: |
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* |
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* xor = init_xor_val |
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* |
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* for (i = from_idx .. to_idx) |
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* xor ^= can_frame.data[i] |
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* |
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* can_frame.data[ result_idx ] = xor |
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* |
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* CGW_CS_CRC8 (length 282 bytes): |
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* Set a CRC8 value into data[result-idx] using a given 256 byte CRC8 table, |
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* a given initial value and a defined input data[start-idx] .. data[end-idx]. |
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* Finally the result value is XOR'ed with the final_xor_val. |
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* |
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* The CRC8 checksum is calculated like this: |
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* |
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* crc = init_crc_val |
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* |
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* for (i = from_idx .. to_idx) |
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* crc = crctab[ crc ^ can_frame.data[i] ] |
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* |
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* can_frame.data[ result_idx ] = crc ^ final_xor_val |
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* |
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* The calculated CRC may contain additional source data elements that can be |
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* defined in the handling of 'checksum profiles' e.g. shown in AUTOSAR specs |
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* like http://www.autosar.org/download/R4.0/AUTOSAR_SWS_E2ELibrary.pdf |
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* E.g. the profile_data[] may contain additional u8 values (called DATA_IDs) |
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* that are used depending on counter values inside the CAN frame data[]. |
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* So far only three profiles have been implemented for illustration. |
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* |
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* Remark: In general the attribute data is a linear buffer. |
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* Beware of sending unpacked or aligned structs! |
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*/ |
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#endif /* !_UAPI_CAN_GW_H */
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