[linux-2.6-block.git] / include / uapi / linux / can / gw.h

/*
 * linux/can/gw.h
 *
 * Definitions for CAN frame Gateway/Router/Bridge
 *
 * Author: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
 * Copyright (c) 2011 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_GW_H
#define _UAPI_CAN_GW_H

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

struct rtcanmsg {
	__u8  can_family;
	__u8  gwtype;
	__u16 flags;
};

/* CAN gateway types */
enum {
	CGW_TYPE_UNSPEC,
	CGW_TYPE_CAN_CAN,	/* CAN->CAN routing */
	__CGW_TYPE_MAX
};

#define CGW_TYPE_MAX (__CGW_TYPE_MAX - 1)

/* CAN rtnetlink attribute definitions */
enum {
	CGW_UNSPEC,
	CGW_MOD_AND,	/* CAN frame modification binary AND */
	CGW_MOD_OR,	/* CAN frame modification binary OR */
	CGW_MOD_XOR,	/* CAN frame modification binary XOR */
	CGW_MOD_SET,	/* CAN frame modification set alternate values */
	CGW_CS_XOR,	/* set data[] XOR checksum into data[index] */
	CGW_CS_CRC8,	/* set data[] CRC8 checksum into data[index] */
	CGW_HANDLED,	/* number of handled CAN frames */
	CGW_DROPPED,	/* number of dropped CAN frames */
	CGW_SRC_IF,	/* ifindex of source network interface */
	CGW_DST_IF,	/* ifindex of destination network interface */
	CGW_FILTER,	/* specify struct can_filter on source CAN device */
	CGW_DELETED,	/* number of deleted CAN frames (see max_hops param) */
	CGW_LIM_HOPS,	/* limit the number of hops of this specific rule */
	__CGW_MAX
};

#define CGW_MAX (__CGW_MAX - 1)

#define CGW_FLAGS_CAN_ECHO 0x01
#define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
#define CGW_FLAGS_CAN_IIF_TX_OK 0x04

#define CGW_MOD_FUNCS 4 /* AND OR XOR SET */

/* CAN frame elements that are affected by curr. 3 CAN frame modifications */
#define CGW_MOD_ID	0x01
#define CGW_MOD_DLC	0x02
#define CGW_MOD_DATA	0x04

#define CGW_FRAME_MODS 3 /* ID DLC DATA */

#define MAX_MODFUNCTIONS (CGW_MOD_FUNCS * CGW_FRAME_MODS)

struct cgw_frame_mod {
	struct can_frame cf;
	__u8 modtype;
} __attribute__((packed));

#define CGW_MODATTR_LEN sizeof(struct cgw_frame_mod)

struct cgw_csum_xor {
	__s8 from_idx;
	__s8 to_idx;
	__s8 result_idx;
	__u8 init_xor_val;
} __attribute__((packed));

struct cgw_csum_crc8 {
	__s8 from_idx;
	__s8 to_idx;
	__s8 result_idx;
	__u8 init_crc_val;
	__u8 final_xor_val;
	__u8 crctab[256];
	__u8 profile;
	__u8 profile_data[20];
} __attribute__((packed));

/* length of checksum operation parameters. idx = index in CAN frame data[] */
#define CGW_CS_XOR_LEN  sizeof(struct cgw_csum_xor)
#define CGW_CS_CRC8_LEN  sizeof(struct cgw_csum_crc8)

/* CRC8 profiles (compute CRC for additional data elements - see below) */
enum {
	CGW_CRC8PRF_UNSPEC,
	CGW_CRC8PRF_1U8,	/* compute one additional u8 value */
	CGW_CRC8PRF_16U8,	/* u8 value table indexed by data[1] & 0xF */
	CGW_CRC8PRF_SFFID_XOR,	/* (can_id & 0xFF) ^ (can_id >> 8 & 0xFF) */
	__CGW_CRC8PRF_MAX
};

#define CGW_CRC8PRF_MAX (__CGW_CRC8PRF_MAX - 1)

/*
 * CAN rtnetlink attribute contents in detail
 *
 * CGW_XXX_IF (length 4 bytes):
 * Sets an interface index for source/destination network interfaces.
 * For the CAN->CAN gwtype the indices of _two_ CAN interfaces are mandatory.
 *
 * CGW_FILTER (length 8 bytes):
 * Sets a CAN receive filter for the gateway job specified by the
 * struct can_filter described in include/linux/can.h
 *
 * CGW_MOD_(AND|OR|XOR|SET) (length 17 bytes):
 * Specifies a modification that's done to a received CAN frame before it is
 * send out to the destination interface.
 *
 * <struct can_frame> data used as operator
 * <u8> affected CAN frame elements
 *
 * CGW_LIM_HOPS (length 1 byte):
 * Limit the number of hops of this specific rule. Usually the received CAN
 * frame can be processed as much as 'max_hops' times (which is given at module
 * load time of the can-gw module). This value is used to reduce the number of
 * possible hops for this gateway rule to a value smaller then max_hops.
 *
 * CGW_CS_XOR (length 4 bytes):
 * Set a simple XOR checksum starting with an initial value into
 * data[result-idx] using data[start-idx] .. data[end-idx]
 *
 * The XOR checksum is calculated like this:
 *
 * xor = init_xor_val
 *
 * for (i = from_idx .. to_idx)
 *      xor ^= can_frame.data[i]
 *
 * can_frame.data[ result_idx ] = xor
 *
 * CGW_CS_CRC8 (length 282 bytes):
 * Set a CRC8 value into data[result-idx] using a given 256 byte CRC8 table,
 * a given initial value and a defined input data[start-idx] .. data[end-idx].
 * Finally the result value is XOR'ed with the final_xor_val.
 *
 * The CRC8 checksum is calculated like this:
 *
 * crc = init_crc_val
 *
 * for (i = from_idx .. to_idx)
 *      crc = crctab[ crc ^ can_frame.data[i] ]
 *
 * can_frame.data[ result_idx ] = crc ^ final_xor_val
 *
 * The calculated CRC may contain additional source data elements that can be
 * defined in the handling of 'checksum profiles' e.g. shown in AUTOSAR specs
 * like http://www.autosar.org/download/R4.0/AUTOSAR_SWS_E2ELibrary.pdf
 * E.g. the profile_data[] may contain additional u8 values (called DATA_IDs)
 * that are used depending on counter values inside the CAN frame data[].
 * So far only three profiles have been implemented for illustration.
 *
 * Remark: In general the attribute data is a linear buffer.
 *         Beware of sending unpacked or aligned structs!
 */

#endif /* !_UAPI_CAN_GW_H */
Commit	Line	Data
c1aabdf3 OH	1	/*
	2	* linux/can/gw.h
	3	*
	4	* Definitions for CAN frame Gateway/Router/Bridge
	5	*
	6	* Author: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
	7	* Copyright (c) 2011 Volkswagen Group Electronic Research
	8	* All rights reserved.
	9	*
2485602f UKK	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. Neither the name of Volkswagen nor the names of its contributors
	19	* may be used to endorse or promote products derived from this software
	20	* without specific prior written permission.
	21	*
	22	* Alternatively, provided that this notice is retained in full, this
	23	* software may be distributed under the terms of the GNU General
	24	* Public License ("GPL") version 2, in which case the provisions of the
	25	* GPL apply INSTEAD OF those given above.
	26	*
	27	* The provided data structures and external interfaces from this code
	28	* are not restricted to be used by modules with a GPL compatible license.
	29	*
	30	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	31	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	32	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	33	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	34	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	35	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	36	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	37	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	38	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	39	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	40	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
	41	* DAMAGE.
c1aabdf3 OH	42	*/
c1aabdf3 OH	43
42193e3e OH	44	#ifndef _UAPI_CAN_GW_H
42193e3e OH	45	#define _UAPI_CAN_GW_H
c1aabdf3 OH	46
	47	#include <linux/types.h>
	48	#include <linux/can.h>
	49
	50	struct rtcanmsg {
	51	__u8 can_family;
	52	__u8 gwtype;
	53	__u16 flags;
	54	};
	55
	56	/* CAN gateway types */
	57	enum {
	58	CGW_TYPE_UNSPEC,
	59	CGW_TYPE_CAN_CAN, /* CAN->CAN routing */
	60	__CGW_TYPE_MAX
	61	};
	62
	63	#define CGW_TYPE_MAX (__CGW_TYPE_MAX - 1)
	64
	65	/* CAN rtnetlink attribute definitions */
	66	enum {
	67	CGW_UNSPEC,
	68	CGW_MOD_AND, /* CAN frame modification binary AND */
	69	CGW_MOD_OR, /* CAN frame modification binary OR */
	70	CGW_MOD_XOR, /* CAN frame modification binary XOR */
	71	CGW_MOD_SET, /* CAN frame modification set alternate values */
	72	CGW_CS_XOR, /* set data[] XOR checksum into data[index] */
	73	CGW_CS_CRC8, /* set data[] CRC8 checksum into data[index] */
	74	CGW_HANDLED, /* number of handled CAN frames */
	75	CGW_DROPPED, /* number of dropped CAN frames */
	76	CGW_SRC_IF, /* ifindex of source network interface */
	77	CGW_DST_IF, /* ifindex of destination network interface */
	78	CGW_FILTER, /* specify struct can_filter on source CAN device */
e6afa00a	79	CGW_DELETED, /* number of deleted CAN frames (see max_hops param) */
391ac128	80	CGW_LIM_HOPS, /* limit the number of hops of this specific rule */
c1aabdf3 OH	81	__CGW_MAX
	82	};
	83
	84	#define CGW_MAX (__CGW_MAX - 1)
	85
	86	#define CGW_FLAGS_CAN_ECHO 0x01
	87	#define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
d904d3ed	88	#define CGW_FLAGS_CAN_IIF_TX_OK 0x04
c1aabdf3 OH	89
	90	#define CGW_MOD_FUNCS 4 /* AND OR XOR SET */
	91
	92	/* CAN frame elements that are affected by curr. 3 CAN frame modifications */
	93	#define CGW_MOD_ID 0x01
	94	#define CGW_MOD_DLC 0x02
	95	#define CGW_MOD_DATA 0x04
	96
	97	#define CGW_FRAME_MODS 3 /* ID DLC DATA */
	98
	99	#define MAX_MODFUNCTIONS (CGW_MOD_FUNCS * CGW_FRAME_MODS)
	100
	101	struct cgw_frame_mod {
	102	struct can_frame cf;
	103	__u8 modtype;
	104	} __attribute__((packed));
	105
	106	#define CGW_MODATTR_LEN sizeof(struct cgw_frame_mod)
	107
	108	struct cgw_csum_xor {
	109	__s8 from_idx;
	110	__s8 to_idx;
	111	__s8 result_idx;
	112	__u8 init_xor_val;
	113	} __attribute__((packed));
	114
	115	struct cgw_csum_crc8 {
	116	__s8 from_idx;
	117	__s8 to_idx;
	118	__s8 result_idx;
	119	__u8 init_crc_val;
	120	__u8 final_xor_val;
	121	__u8 crctab[256];
	122	__u8 profile;
	123	__u8 profile_data[20];
	124	} __attribute__((packed));
	125
	126	/* length of checksum operation parameters. idx = index in CAN frame data[] */
	127	#define CGW_CS_XOR_LEN sizeof(struct cgw_csum_xor)
	128	#define CGW_CS_CRC8_LEN sizeof(struct cgw_csum_crc8)
	129
	130	/* CRC8 profiles (compute CRC for additional data elements - see below) */
	131	enum {
	132	CGW_CRC8PRF_UNSPEC,
	133	CGW_CRC8PRF_1U8, /* compute one additional u8 value */
	134	CGW_CRC8PRF_16U8, /* u8 value table indexed by data[1] & 0xF */
	135	CGW_CRC8PRF_SFFID_XOR, /* (can_id & 0xFF) ^ (can_id >> 8 & 0xFF) */
	136	__CGW_CRC8PRF_MAX
	137	};
	138
	139	#define CGW_CRC8PRF_MAX (__CGW_CRC8PRF_MAX - 1)
	140
	141	/*
	142	* CAN rtnetlink attribute contents in detail
	143	*
	144	* CGW_XXX_IF (length 4 bytes):
	145	* Sets an interface index for source/destination network interfaces.
	146	* For the CAN->CAN gwtype the indices of _two_ CAN interfaces are mandatory.
	147	*
	148	* CGW_FILTER (length 8 bytes):
	149	* Sets a CAN receive filter for the gateway job specified by the
	150	* struct can_filter described in include/linux/can.h
	151	*
391ac128	152	* CGW_MOD_(AND\|OR\|XOR\|SET) (length 17 bytes):
c1aabdf3 OH	153	* Specifies a modification that's done to a received CAN frame before it is
	154	* send out to the destination interface.
	155	*
	156	* <struct can_frame> data used as operator
	157	* <u8> affected CAN frame elements
	158	*
391ac128 OH	159	* CGW_LIM_HOPS (length 1 byte):
	160	* Limit the number of hops of this specific rule. Usually the received CAN
	161	* frame can be processed as much as 'max_hops' times (which is given at module
	162	* load time of the can-gw module). This value is used to reduce the number of
	163	* possible hops for this gateway rule to a value smaller then max_hops.
	164	*
c1aabdf3 OH	165	* CGW_CS_XOR (length 4 bytes):
	166	* Set a simple XOR checksum starting with an initial value into
	167	* data[result-idx] using data[start-idx] .. data[end-idx]
	168	*
	169	* The XOR checksum is calculated like this:
	170	*
	171	* xor = init_xor_val
	172	*
	173	* for (i = from_idx .. to_idx)
	174	* xor ^= can_frame.data[i]
	175	*
	176	* can_frame.data[ result_idx ] = xor
	177	*
	178	* CGW_CS_CRC8 (length 282 bytes):
	179	* Set a CRC8 value into data[result-idx] using a given 256 byte CRC8 table,
	180	* a given initial value and a defined input data[start-idx] .. data[end-idx].
	181	* Finally the result value is XOR'ed with the final_xor_val.
	182	*
	183	* The CRC8 checksum is calculated like this:
	184	*
	185	* crc = init_crc_val
	186	*
	187	* for (i = from_idx .. to_idx)
	188	* crc = crctab[ crc ^ can_frame.data[i] ]
	189	*
	190	* can_frame.data[ result_idx ] = crc ^ final_xor_val
	191	*
	192	* The calculated CRC may contain additional source data elements that can be
	193	* defined in the handling of 'checksum profiles' e.g. shown in AUTOSAR specs
	194	* like http://www.autosar.org/download/R4.0/AUTOSAR_SWS_E2ELibrary.pdf
	195	* E.g. the profile_data[] may contain additional u8 values (called DATA_IDs)
	196	* that are used depending on counter values inside the CAN frame data[].
	197	* So far only three profiles have been implemented for illustration.
	198	*
	199	* Remark: In general the attribute data is a linear buffer.
	200	* Beware of sending unpacked or aligned structs!
	201	*/
	202
42193e3e	203	#endif /* !_UAPI_CAN_GW_H */