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)

<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

<MOD> is a CAN FD frame modification instruction consisting of <instruction>:<canfd_frame-elements>:<can_id>.<flags>.<len>.<can_data>

<instruction>

is one of 'AND' 'OR' 'XOR' 'SET'

<canfd_frame-elements>

is _one_ or _more_ of 'I'd 'F'lags 'L'ength 'D'ata

<can_id>

is an u32 value containing the CAN FD Identifier

<flags>

is an u8 value containing CAN FD flags (CANFD_BRS, CANFD_ESI)

<len>

is an u8 value containing the data length (0 .. 64)

<can_data>

is always 64(!) u8 values containing the CAN FD 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)