How to disable reception of socket CAN frames

[mejtejt]

Is your feature request related to a problem? Please describe.
I am using setsockopt function to subscribe to the messages I want tor receive on the CAN. The function is as follows:

setsockopt(socket_id, SOL_CAN_RAW, CAN_RAW_FILTER, &filter,
                       sizeof(filter));

And the code runs, I am receiving messages I want. After some time, I want to tell socket CAN "stop receiving those messages". I tried implementing it with the following function:

setsockopt(socket_id, SOL_CAN_RAW, CAN_RAW_FILTER, NULL,0);

But the function call fails, with a reason: Invalid argument. So, my question is: how can I tell socket CAN to stop receiving messages on a socket?

[jukkar]

Indeed the code checks that option and size are correct.
See

zephyr/subsys/net/lib/sockets/sockets_can.c

Line 603 in ae35d30

if (optname == CAN_RAW_FILTER && optlen != sizeof(struct can_filter)) {

and few lines below for details.
If giving NULL option and/or 0 length would mean that the filter needs to be unregistered, then these checks should be changed. Would you be able to send patches for these?

[jukkar]

BTW, have you checked how the filter is removed in Linux? We should probably do it similarly in Zephyr.

[mejtejt]

Setting optval to NULL, and optlen to 0 is exactly how I use it on Linux. The following is an excerpt from my Linux code:

And it works just like I want it to. This is part of the CAN_Open function, where I want to explicitly set that no messages are to be received before instructed to do so.

[github-actions]

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