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net: em_canid: Ematch rule to match CAN frames according to their identifiers

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This ematch makes it possible to classify CAN frames (AF_CAN) according
to their identifiers. This functionality can not be easily achieved with
existing classifiers, such as u32, because CAN identifier is always stored
in native endianness, whereas u32 expects Network byte order.

Signed-off-by: Rostislav Lisovy <lisovy@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Rostislav Lisovy 2012-07-04 05:32:03 +02:00 • committed by Marc Kleine-Budde
parent 30c1e67204
commit f057bbb6f9
5 changed files with 257 additions and 2 deletions
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3
include/linux/can.h
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@ -38,6 +38,9 @@
*/
typedef __u32 canid_t;
#define CAN_SFF_ID_BITS 11
#define CAN_EFF_ID_BITS 29
/*
* Controller Area Network Error Message Frame Mask structure
*