+++ /dev/null
-/*
- * 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.
- *
- */
-
-#ifndef CAN_GW_H
-#define 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_MAX
-};
-
-#define CGW_MAX (__CGW_MAX - 1)
-
-#define CGW_FLAGS_CAN_ECHO 0x01
-#define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
-
-#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_XXX (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_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
projects / karo-tx-linux.git / blobdiff