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authorOliver Hartkopp <socketcan@hartkopp.net>2015-04-01 08:50:29 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2015-04-01 12:28:22 +0300
commita5581ef4c2eac6449188862e903eb46c7233582a (patch)
treeb334b1858d3bffe49af1fb95650cb5affb7e1510 /include/uapi/linux/can
parent514ac99c64b22d83b52dfee3b8becaa69a92bc4a (diff)
downloadlinux-a5581ef4c2eac6449188862e903eb46c7233582a.tar.xz
can: introduce new raw socket option to join the given CAN filters
The CAN_RAW socket can set multiple CAN identifier specific filters that lead to multiple filters in the af_can.c filter processing. These filters are indenpendent from each other which leads to logical OR'ed filters when applied. This socket option joines the given CAN filters in the way that only CAN frames are passed to user space that matched *all* given CAN filters. The semantic for the applied filters is therefore changed to a logical AND. This is useful especially when the filterset is a combination of filters where the CAN_INV_FILTER flag is set in order to notch single CAN IDs or CAN ID ranges from the incoming traffic. As the raw_rcv() function is executed from NET_RX softirq the introduced variables are implemented as per-CPU variables to avoid extensive locking at CAN frame reception time. Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include/uapi/linux/can')
-rw-r--r--include/uapi/linux/can/raw.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/can/raw.h b/include/uapi/linux/can/raw.h
index 78ec76fd89a6..8735f1080385 100644
--- a/include/uapi/linux/can/raw.h
+++ b/include/uapi/linux/can/raw.h
@@ -57,6 +57,7 @@ enum {
CAN_RAW_LOOPBACK, /* local loopback (default:on) */
CAN_RAW_RECV_OWN_MSGS, /* receive my own msgs (default:off) */
CAN_RAW_FD_FRAMES, /* allow CAN FD frames (default:off) */
+ CAN_RAW_JOIN_FILTERS, /* all filters must match to trigger */
};
#endif /* !_UAPI_CAN_RAW_H */