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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 | */ |
43 | ||
42193e3e OH |
44 | #ifndef _UAPI_CAN_GW_H |
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 */ |
dd895d7f | 81 | CGW_MOD_UID, /* user defined identifier for modification updates */ |
c1aabdf3 OH |
82 | __CGW_MAX |
83 | }; | |
84 | ||
85 | #define CGW_MAX (__CGW_MAX - 1) | |
86 | ||
87 | #define CGW_FLAGS_CAN_ECHO 0x01 | |
88 | #define CGW_FLAGS_CAN_SRC_TSTAMP 0x02 | |
d904d3ed | 89 | #define CGW_FLAGS_CAN_IIF_TX_OK 0x04 |
c1aabdf3 OH |
90 | |
91 | #define CGW_MOD_FUNCS 4 /* AND OR XOR SET */ | |
92 | ||
93 | /* CAN frame elements that are affected by curr. 3 CAN frame modifications */ | |
94 | #define CGW_MOD_ID 0x01 | |
95 | #define CGW_MOD_DLC 0x02 | |
96 | #define CGW_MOD_DATA 0x04 | |
97 | ||
98 | #define CGW_FRAME_MODS 3 /* ID DLC DATA */ | |
99 | ||
100 | #define MAX_MODFUNCTIONS (CGW_MOD_FUNCS * CGW_FRAME_MODS) | |
101 | ||
102 | struct cgw_frame_mod { | |
103 | struct can_frame cf; | |
104 | __u8 modtype; | |
105 | } __attribute__((packed)); | |
106 | ||
107 | #define CGW_MODATTR_LEN sizeof(struct cgw_frame_mod) | |
108 | ||
109 | struct cgw_csum_xor { | |
110 | __s8 from_idx; | |
111 | __s8 to_idx; | |
112 | __s8 result_idx; | |
113 | __u8 init_xor_val; | |
114 | } __attribute__((packed)); | |
115 | ||
116 | struct cgw_csum_crc8 { | |
117 | __s8 from_idx; | |
118 | __s8 to_idx; | |
119 | __s8 result_idx; | |
120 | __u8 init_crc_val; | |
121 | __u8 final_xor_val; | |
122 | __u8 crctab[256]; | |
123 | __u8 profile; | |
124 | __u8 profile_data[20]; | |
125 | } __attribute__((packed)); | |
126 | ||
127 | /* length of checksum operation parameters. idx = index in CAN frame data[] */ | |
128 | #define CGW_CS_XOR_LEN sizeof(struct cgw_csum_xor) | |
129 | #define CGW_CS_CRC8_LEN sizeof(struct cgw_csum_crc8) | |
130 | ||
131 | /* CRC8 profiles (compute CRC for additional data elements - see below) */ | |
132 | enum { | |
133 | CGW_CRC8PRF_UNSPEC, | |
134 | CGW_CRC8PRF_1U8, /* compute one additional u8 value */ | |
135 | CGW_CRC8PRF_16U8, /* u8 value table indexed by data[1] & 0xF */ | |
136 | CGW_CRC8PRF_SFFID_XOR, /* (can_id & 0xFF) ^ (can_id >> 8 & 0xFF) */ | |
137 | __CGW_CRC8PRF_MAX | |
138 | }; | |
139 | ||
140 | #define CGW_CRC8PRF_MAX (__CGW_CRC8PRF_MAX - 1) | |
141 | ||
142 | /* | |
143 | * CAN rtnetlink attribute contents in detail | |
144 | * | |
145 | * CGW_XXX_IF (length 4 bytes): | |
146 | * Sets an interface index for source/destination network interfaces. | |
147 | * For the CAN->CAN gwtype the indices of _two_ CAN interfaces are mandatory. | |
148 | * | |
149 | * CGW_FILTER (length 8 bytes): | |
150 | * Sets a CAN receive filter for the gateway job specified by the | |
151 | * struct can_filter described in include/linux/can.h | |
152 | * | |
391ac128 | 153 | * CGW_MOD_(AND|OR|XOR|SET) (length 17 bytes): |
c1aabdf3 OH |
154 | * Specifies a modification that's done to a received CAN frame before it is |
155 | * send out to the destination interface. | |
156 | * | |
157 | * <struct can_frame> data used as operator | |
158 | * <u8> affected CAN frame elements | |
159 | * | |
391ac128 OH |
160 | * CGW_LIM_HOPS (length 1 byte): |
161 | * Limit the number of hops of this specific rule. Usually the received CAN | |
162 | * frame can be processed as much as 'max_hops' times (which is given at module | |
163 | * load time of the can-gw module). This value is used to reduce the number of | |
164 | * possible hops for this gateway rule to a value smaller then max_hops. | |
165 | * | |
dd895d7f OH |
166 | * CGW_MOD_UID (length 4 bytes): |
167 | * Optional non-zero user defined routing job identifier to alter existing | |
168 | * modification settings at runtime. | |
169 | * | |
c1aabdf3 OH |
170 | * CGW_CS_XOR (length 4 bytes): |
171 | * Set a simple XOR checksum starting with an initial value into | |
172 | * data[result-idx] using data[start-idx] .. data[end-idx] | |
173 | * | |
174 | * The XOR checksum is calculated like this: | |
175 | * | |
176 | * xor = init_xor_val | |
177 | * | |
178 | * for (i = from_idx .. to_idx) | |
179 | * xor ^= can_frame.data[i] | |
180 | * | |
181 | * can_frame.data[ result_idx ] = xor | |
182 | * | |
183 | * CGW_CS_CRC8 (length 282 bytes): | |
184 | * Set a CRC8 value into data[result-idx] using a given 256 byte CRC8 table, | |
185 | * a given initial value and a defined input data[start-idx] .. data[end-idx]. | |
186 | * Finally the result value is XOR'ed with the final_xor_val. | |
187 | * | |
188 | * The CRC8 checksum is calculated like this: | |
189 | * | |
190 | * crc = init_crc_val | |
191 | * | |
192 | * for (i = from_idx .. to_idx) | |
193 | * crc = crctab[ crc ^ can_frame.data[i] ] | |
194 | * | |
195 | * can_frame.data[ result_idx ] = crc ^ final_xor_val | |
196 | * | |
197 | * The calculated CRC may contain additional source data elements that can be | |
198 | * defined in the handling of 'checksum profiles' e.g. shown in AUTOSAR specs | |
199 | * like http://www.autosar.org/download/R4.0/AUTOSAR_SWS_E2ELibrary.pdf | |
200 | * E.g. the profile_data[] may contain additional u8 values (called DATA_IDs) | |
201 | * that are used depending on counter values inside the CAN frame data[]. | |
202 | * So far only three profiles have been implemented for illustration. | |
203 | * | |
204 | * Remark: In general the attribute data is a linear buffer. | |
205 | * Beware of sending unpacked or aligned structs! | |
206 | */ | |
207 | ||
42193e3e | 208 | #endif /* !_UAPI_CAN_GW_H */ |