4 * Definitions for isotp CAN sockets
6 * Author: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
7 * Copyright (c) 2008 Volkswagen Group Electronic Research
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
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.
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
43 * Send feedback to <linux-can@vger.kernel.org>
49 #include <linux/can.h>
51 #define SOL_CAN_ISOTP (SOL_CAN_BASE + CAN_ISOTP)
53 /* for socket options affecting the socket (not the global system) */
55 #define CAN_ISOTP_OPTS 1 /* pass struct can_isotp_options */
57 #define CAN_ISOTP_RECV_FC 2 /* pass struct can_isotp_fc_options */
59 /* sockopts to force stmin timer values for protocol regression tests */
61 #define CAN_ISOTP_TX_STMIN 3 /* pass __u32 value in nano secs */
62 /* use this time instead of value */
63 /* provided in FC from the receiver */
65 #define CAN_ISOTP_RX_STMIN 4 /* pass __u32 value in nano secs */
66 /* ignore received CF frames which */
67 /* timestamps differ less than val */
69 #define CAN_ISOTP_LL_OPTS 5 /* pass struct can_isotp_ll_options */
71 struct can_isotp_options {
73 __u32 flags; /* set flags for isotp behaviour. */
74 /* __u32 value : flags see below */
76 __u32 frame_txtime; /* frame transmission time (N_As/N_Ar) */
77 /* __u32 value : time in nano secs */
79 __u8 ext_address; /* set address for extended addressing */
80 /* __u8 value : extended address */
82 __u8 txpad_content; /* set content of padding byte (tx) */
83 /* __u8 value : content on tx path */
85 __u8 rxpad_content; /* set content of padding byte (rx) */
86 /* __u8 value : content on rx path */
88 __u8 rx_ext_address; /* set address for extended addressing */
89 /* __u8 value : extended address (rx) */
92 struct can_isotp_fc_options {
94 __u8 bs; /* blocksize provided in FC frame */
95 /* __u8 value : blocksize. 0 = off */
97 __u8 stmin; /* separation time provided in FC frame */
99 /* 0x00 - 0x7F : 0 - 127 ms */
100 /* 0x80 - 0xF0 : reserved */
101 /* 0xF1 - 0xF9 : 100 us - 900 us */
102 /* 0xFA - 0xFF : reserved */
104 __u8 wftmax; /* max. number of wait frame transmiss. */
105 /* __u8 value : 0 = omit FC N_PDU WT */
108 struct can_isotp_ll_options {
110 __u8 mtu; /* generated & accepted CAN frame type */
112 /* CAN_MTU (16) -> standard CAN 2.0 */
113 /* CANFD_MTU (72) -> CAN FD frame */
115 __u8 tx_dl; /* tx link layer data length in bytes */
116 /* (configured maximum payload length) */
117 /* __u8 value : 8,12,16,20,24,32,48,64 */
118 /* => rx path supports all LL_DL values */
120 __u8 tx_flags; /* set into struct canfd_frame.flags */
121 /* at frame creation: e.g. CANFD_BRS */
122 /* Obsolete when the BRS flag is fixed */
123 /* by the CAN netdriver configuration */
127 /* flags for isotp behaviour */
129 #define CAN_ISOTP_LISTEN_MODE 0x001 /* listen only (do not send FC) */
130 #define CAN_ISOTP_EXTEND_ADDR 0x002 /* enable extended addressing */
131 #define CAN_ISOTP_TX_PADDING 0x004 /* enable CAN frame padding tx path */
132 #define CAN_ISOTP_RX_PADDING 0x008 /* enable CAN frame padding rx path */
133 #define CAN_ISOTP_CHK_PAD_LEN 0x010 /* check received CAN frame padding */
134 #define CAN_ISOTP_CHK_PAD_DATA 0x020 /* check received CAN frame padding */
135 #define CAN_ISOTP_HALF_DUPLEX 0x040 /* half duplex error state handling */
136 #define CAN_ISOTP_FORCE_TXSTMIN 0x080 /* ignore stmin from received FC */
137 #define CAN_ISOTP_FORCE_RXSTMIN 0x100 /* ignore CFs depending on rx stmin */
138 #define CAN_ISOTP_RX_EXT_ADDR 0x200 /* different rx extended addressing */
143 #define CAN_ISOTP_DEFAULT_FLAGS 0
144 #define CAN_ISOTP_DEFAULT_EXT_ADDRESS 0x00
145 #define CAN_ISOTP_DEFAULT_PAD_CONTENT 0xCC /* prevent bit-stuffing */
146 #define CAN_ISOTP_DEFAULT_FRAME_TXTIME 0
147 #define CAN_ISOTP_DEFAULT_RECV_BS 0
148 #define CAN_ISOTP_DEFAULT_RECV_STMIN 0x00
149 #define CAN_ISOTP_DEFAULT_RECV_WFTMAX 0
151 #define CAN_ISOTP_DEFAULT_LL_MTU CAN_MTU
152 #define CAN_ISOTP_DEFAULT_LL_TX_DL CAN_MAX_DLEN
153 #define CAN_ISOTP_DEFAULT_LL_TX_FLAGS 0
156 * Remark on CAN_ISOTP_DEFAULT_RECV_* values:
158 * We can strongly assume, that the Linux Kernel implementation of
159 * CAN_ISOTP is capable to run with BS=0, STmin=0 and WFTmax=0.
160 * But as we like to be able to behave as a commonly available ECU,
161 * these default settings can be changed via sockopts.
162 * For that reason the STmin value is intentionally _not_ checked for
163 * consistency and copied directly into the flow control (FC) frame.