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can: add a note that RECV_OWN_MSGS frames are subject to filtering

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Some parts of the documentation may lead the reader to think that the
socket's own frames are always received when CAN_RAW_RECV_OWN_MSGS is
enabled, but all frames are subject to filtering.

As explained by Marc Kleine-Budde:

On TX complete of a CAN frame it's pushed into the RX path of the
networking stack, along with the information of the originating socket.

Then the CAN frame is delivered into AF_CAN, where it is passed on to
all registered receivers depending on filters. One receiver is the
sending socket in CAN_RAW. Then in CAN_RAW the it is checked if the
sending socket has RECV_OWN_MSGS enabled.

Link: https://lore.kernel.org/r/20210420191212.42753-1-erik@flodin.me
Signed-off-by: Erik Flodin <erik@flodin.me>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Erik Flodin 2021-04-20 21:12:00 +02:00 committed by Marc Kleine-Budde
parent 1c9690dd30
commit 924e464f4a
1 changed files with 2 additions and 0 deletions
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2
Documentation/networking/can.rst
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@ -608,6 +608,8 @@ demand:
setsockopt(s, SOL_CAN_RAW, CAN_RAW_RECV_OWN_MSGS,
&recv_own_msgs, sizeof(recv_own_msgs));
Note that reception of a socket's own CAN frames are subject to the same
filtering as other CAN frames (see :ref:`socketcan-rawfilter`).
.. _socketcan-rawfd: