can: fix multiple delivery of a single CAN frame for overlapping CAN filters

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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 patch makes sure that every CAN frame which is filtered for a specific
socket is only delivered once to the user space. This is independent from the
number of matching CAN filters of this socket.

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>

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Oliver Hartkopp 2015-04-01 07:50:28 +02:00 • committed by Marc Kleine-Budde

parent a0bc163a7c

commit 514ac99c64

1 changed files with 21 additions and 0 deletions

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net/can/raw.c

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