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authorOliver Hartkopp <socketcan@hartkopp.net>2013-08-26 15:05:36 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2013-08-29 22:58:24 +0200
commit391ac1282dd7ff1cb8245cccc5262e8e4173edc4 (patch)
tree891c2d57e8b2424b72e07815b7f203317257c93e /include/uapi
parent1149108e2fbf98899447d4567901bf07825ee576 (diff)
can: gw: add a per rule limitation of frame hops
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>
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/can/gw.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/uapi/linux/can/gw.h b/include/uapi/linux/can/gw.h
index ae07bec74f4b..4e27c82b564a 100644
--- a/include/uapi/linux/can/gw.h
+++ b/include/uapi/linux/can/gw.h
@@ -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]