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can: gw: add a per rule limitation of frame hops

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Usually the received CAN frames can be processed/routed as much as 'max_hops'
times (which is given at module load time of the can-gw module).
Introduce a new configuration option to reduce the number of possible hops
for a specific gateway rule to a value smaller then max_hops.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp 2013-08-26 15:05:36 +02:00 • committed by Marc Kleine-Budde
commit 391ac1282d
2 changed files with 39 additions and 5 deletions
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9
include/uapi/linux/can/gw.h
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@ -45,6 +45,7 @@ enum {
CGW_DST_IF, /* ifindex of destination network interface */
CGW_FILTER, /* specify struct can_filter on source CAN device */
CGW_DELETED, /* number of deleted CAN frames (see max_hops param) */
CGW_LIM_HOPS, /* limit the number of hops of this specific rule */
__CGW_MAX
};
@ -116,13 +117,19 @@ enum {
* Sets a CAN receive filter for the gateway job specified by the
* struct can_filter described in include/linux/can.h
*
* CGW_MOD_XXX (length 17 bytes):
* CGW_MOD_(AND|OR|XOR|SET) (length 17 bytes):
* Specifies a modification that's done to a received CAN frame before it is
* send out to the destination interface.
*
* <struct can_frame> data used as operator
* <u8> affected CAN frame elements
*
* CGW_LIM_HOPS (length 1 byte):
* Limit the number of hops of this specific rule. Usually the received CAN
* frame can be processed as much as 'max_hops' times (which is given at module
* load time of the can-gw module). This value is used to reduce the number of
* possible hops for this gateway rule to a value smaller then max_hops.
*
* CGW_CS_XOR (length 4 bytes):
* Set a simple XOR checksum starting with an initial value into
* data[result-idx] using data[start-idx] .. data[end-idx]