FreeBSD-native CAN Stack and AF_CAN Protocol Family

From: Jrmie_JOURDIN <jeremie.jourdin_at_advens.fr>
Date: Fri, 20 Jun 2025 12:51:39 UTC 
Hello all,

I am working on a system (15-current) that requires interaction with a CAN network.
So far, I have developped a driver for my controller, able to send and receive CAN frames to and from connected devices.

Id like to implement a FreeBSD-native CAN network stack that is API-compatible with Linuxs Netlink CAN (netcan).
This would allow us to recompile and use existing Linux userland tools with minimal changes.

If you believe this development could benefit the community, I would be happy to submit a set of patches (driver + netcan support).

Were considering defining a new Protocol Family, AF_CAN, for this purpose.
Would it be acceptable to use the first available  AF_VENDORXX  from sys/socket.h ?

I would appreciate your thoughts, advice, and any recommendations you may have on this matter.

-- Jrmie