1 /* SPDX-License-Identifier: ((GPL-2.0-only WIT 1
2 /*
3 * linux/can/gw.h
4 *
5 * Definitions for CAN frame Gateway/Router/Br
6 *
7 * Author: Oliver Hartkopp <oliver.hartkopp@vo
8 * Copyright (c) 2011 Volkswagen Group Electro
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary
12 * modification, are permitted provided that t
13 * are met:
14 * 1. Redistributions of source code must reta
15 * notice, this list of conditions and the
16 * 2. Redistributions in binary form must repr
17 * notice, this list of conditions and the
18 * documentation and/or other materials pro
19 * 3. Neither the name of Volkswagen nor the n
20 * may be used to endorse or promote produc
21 * without specific prior written permissio
22 *
23 * Alternatively, provided that this notice is
24 * software may be distributed under the terms
25 * Public License ("GPL") version 2, in which
26 * GPL apply INSTEAD OF those given above.
27 *
28 * The provided data structures and external i
29 * are not restricted to be used by modules wi
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTI
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCH
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
35 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIR
36 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGE
37 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, S
40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE PO
42 * DAMAGE.
43 */
44
45 #ifndef _UAPI_CAN_GW_H
46 #define _UAPI_CAN_GW_H
47
48 #include <linux/types.h>
49 #include <linux/can.h>
50
51 struct rtcanmsg {
52 __u8 can_family;
53 __u8 gwtype;
54 __u16 flags;
55 };
56
57 /* CAN gateway types */
58 enum {
59 CGW_TYPE_UNSPEC,
60 CGW_TYPE_CAN_CAN, /* CAN->CAN ro
61 __CGW_TYPE_MAX
62 };
63
64 #define CGW_TYPE_MAX (__CGW_TYPE_MAX - 1)
65
66 /* CAN rtnetlink attribute definitions */
67 enum {
68 CGW_UNSPEC,
69 CGW_MOD_AND, /* CAN frame modificat
70 CGW_MOD_OR, /* CAN frame modificat
71 CGW_MOD_XOR, /* CAN frame modificat
72 CGW_MOD_SET, /* CAN frame modificat
73 CGW_CS_XOR, /* set data[] XOR chec
74 CGW_CS_CRC8, /* set data[] CRC8 che
75 CGW_HANDLED, /* number of handled C
76 CGW_DROPPED, /* number of dropped C
77 CGW_SRC_IF, /* ifindex of source n
78 CGW_DST_IF, /* ifindex of destinat
79 CGW_FILTER, /* specify struct can_
80 CGW_DELETED, /* number of deleted C
81 CGW_LIM_HOPS, /* limit the number of
82 CGW_MOD_UID, /* user defined identi
83 CGW_FDMOD_AND, /* CAN FD frame modifi
84 CGW_FDMOD_OR, /* CAN FD frame modifi
85 CGW_FDMOD_XOR, /* CAN FD frame modifi
86 CGW_FDMOD_SET, /* CAN FD frame modifi
87 __CGW_MAX
88 };
89
90 #define CGW_MAX (__CGW_MAX - 1)
91
92 #define CGW_FLAGS_CAN_ECHO 0x01
93 #define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
94 #define CGW_FLAGS_CAN_IIF_TX_OK 0x04
95 #define CGW_FLAGS_CAN_FD 0x08
96
97 #define CGW_MOD_FUNCS 4 /* AND OR XOR SET */
98
99 /* CAN frame elements that are affected by cur
100 #define CGW_MOD_ID 0x01
101 #define CGW_MOD_DLC 0x02 /* Cla
102 #define CGW_MOD_LEN CGW_MOD_DLC /* CAN
103 #define CGW_MOD_DATA 0x04
104 #define CGW_MOD_FLAGS 0x08 /* CAN
105
106 #define CGW_FRAME_MODS 4 /* ID DLC/LEN DATA FL
107
108 #define MAX_MODFUNCTIONS (CGW_MOD_FUNCS * CGW_
109
110 struct cgw_frame_mod {
111 struct can_frame cf;
112 __u8 modtype;
113 } __attribute__((packed));
114
115 struct cgw_fdframe_mod {
116 struct canfd_frame cf;
117 __u8 modtype;
118 } __attribute__((packed));
119
120 #define CGW_MODATTR_LEN sizeof(struct cgw_fram
121 #define CGW_FDMODATTR_LEN sizeof(struct cgw_fd
122
123 struct cgw_csum_xor {
124 __s8 from_idx;
125 __s8 to_idx;
126 __s8 result_idx;
127 __u8 init_xor_val;
128 } __attribute__((packed));
129
130 struct cgw_csum_crc8 {
131 __s8 from_idx;
132 __s8 to_idx;
133 __s8 result_idx;
134 __u8 init_crc_val;
135 __u8 final_xor_val;
136 __u8 crctab[256];
137 __u8 profile;
138 __u8 profile_data[20];
139 } __attribute__((packed));
140
141 /* length of checksum operation parameters. id
142 #define CGW_CS_XOR_LEN sizeof(struct cgw_csum
143 #define CGW_CS_CRC8_LEN sizeof(struct cgw_csu
144
145 /* CRC8 profiles (compute CRC for additional d
146 enum {
147 CGW_CRC8PRF_UNSPEC,
148 CGW_CRC8PRF_1U8, /* compute one
149 CGW_CRC8PRF_16U8, /* u8 value ta
150 CGW_CRC8PRF_SFFID_XOR, /* (can_id & 0
151 __CGW_CRC8PRF_MAX
152 };
153
154 #define CGW_CRC8PRF_MAX (__CGW_CRC8PRF_MAX - 1
155
156 /*
157 * CAN rtnetlink attribute contents in detail
158 *
159 * CGW_XXX_IF (length 4 bytes):
160 * Sets an interface index for source/destinat
161 * For the CAN->CAN gwtype the indices of _two
162 *
163 * CGW_FILTER (length 8 bytes):
164 * Sets a CAN receive filter for the gateway j
165 * struct can_filter described in include/linu
166 *
167 * CGW_MOD_(AND|OR|XOR|SET) (length 17 bytes):
168 * Specifies a modification that's done to a r
169 * send out to the destination interface.
170 *
171 * <struct can_frame> data used as operator
172 * <u8> affected CAN frame elements
173 *
174 * CGW_LIM_HOPS (length 1 byte):
175 * Limit the number of hops of this specific r
176 * frame can be processed as much as 'max_hops
177 * load time of the can-gw module). This value
178 * possible hops for this gateway rule to a va
179 *
180 * CGW_MOD_UID (length 4 bytes):
181 * Optional non-zero user defined routing job
182 * modification settings at runtime.
183 *
184 * CGW_CS_XOR (length 4 bytes):
185 * Set a simple XOR checksum starting with an
186 * data[result-idx] using data[start-idx] .. d
187 *
188 * The XOR checksum is calculated like this:
189 *
190 * xor = init_xor_val
191 *
192 * for (i = from_idx .. to_idx)
193 * xor ^= can_frame.data[i]
194 *
195 * can_frame.data[ result_idx ] = xor
196 *
197 * CGW_CS_CRC8 (length 282 bytes):
198 * Set a CRC8 value into data[result-idx] usin
199 * a given initial value and a defined input d
200 * Finally the result value is XOR'ed with the
201 *
202 * The CRC8 checksum is calculated like this:
203 *
204 * crc = init_crc_val
205 *
206 * for (i = from_idx .. to_idx)
207 * crc = crctab[ crc ^ can_frame.data[i]
208 *
209 * can_frame.data[ result_idx ] = crc ^ final_
210 *
211 * The calculated CRC may contain additional s
212 * defined in the handling of 'checksum profil
213 * like http://www.autosar.org/download/R4.0/A
214 * E.g. the profile_data[] may contain additio
215 * that are used depending on counter values i
216 * So far only three profiles have been implem
217 *
218 * Remark: In general the attribute data is a
219 * Beware of sending unpacked or align
220 */
221
222 #endif /* !_UAPI_CAN_GW_H */
223
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.