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CANGW(1) User Commands CANGW(1)

NAME

cangw - manual page for cangw 2018.02.0-1

SYNOPSIS

cangw [options]

DESCRIPTION

cangw - manage PF_CAN netlink gateway.

Commands:

-A
(add a new rule)
-D
(delete a rule)
-F
(flush / delete all rules)
-L
(list all rules)

Mandatory:

-s <src_dev>
(source netdevice)
-d <dst_dev>
(destination netdevice)

OPTIONS

-t
(preserve src_dev rx timestamp)
-e
(echo sent frames - recommended on vcanx)
-i
(allow to route to incoming interface)
-u <uid>
(user defined modification identifier)
-l <hops>
(limit the number of frame hops / routings)
-f <filter>
(set CAN filter)
-m <mod>
(set frame modifications)
-x <from_idx>:<to_idx>:<result_idx>:<init_xor_val>
(XOR checksum)
-c <from>:<to>:<result>:<init_val>:<xor_val>:<crctab[256]>
(CRC8 cs)
-p <profile>:[<profile_data>]
(CRC8 checksum profile & parameters)

Values are given and expected in hexadecimal values. Leading 0s can be omitted.

<filter> is a <value><mask> CAN identifier filter:

<can_id>:<can_mask>
(matches when <received_can_id> & mask == can_id & mask)
<can_id>~<can_mask>
(matches when <received_can_id> & mask != can_id & mask)

<mod> is a CAN frame modification instruction consisting of <instruction>:<can_frame-elements>:<can_id>.<can_dlc>.<can_data>

<instruction>
is one of 'AND' 'OR' 'XOR' 'SET'
<can_frame-elements>
is _one_ or _more_ of 'I'dentifier 'L'ength 'D'ata
<can_id>
is an u32 value containing the CAN Identifier
<can_dlc>
is an u8 value containing the data length code (0 .. 8)
<can_data>
is always eight(!) u8 values containing the CAN frames data

The max. four modifications are performed in the order AND -> OR -> XOR -> SET

Supported CRC 8 profiles:

Profile '1' (1U8)
- add one additional u8 value
Profile '2' (16U8)
- add u8 value from table[16] indexed by (data[1] & 0xF)
Profile '3' (SFFID_XOR)
- add u8 value (can_id & 0xFF) ^ (can_id >> 8 & 0xFF)

EXAMPLES

cangw -A -s can0 -d vcan3 -e -f 123:C00007FF -m SET:IL:333.4.1122334455667788
February 2018 cangw 2018.02.0-1