Re: Raw CAN socket support in LXC?

[Oliver Hartkopp <socketcan@hartkopp.net>]

On 05/11/2015 03:06 PM, John Ernberg wrote:

> I succeeded in forwarding the can interface into the container.
> When I tried to open a socket, and bind it to the interface to make a 
> test for receiving frames I got an error saying "socket: Address family 
> not supported by protocol".
> Looking around in LXC, and then the kernel, I discovered that the AF_CAN 
> implementation does not support net_namespaces yet, and net_namespaces 
> does not implement any handling for CAN, so we cannot open any kind of 
> socket to actually read from the interface.
> 
> Is there anything quick and dirty I could try to see if socket traffic 
> can be forwarded into the container on a phys-forwarded CAN interface? 

You can try to read CAN frames from the CAN netdev via AF_PACKET socket:

https://github.com/linux-can/can-tests/blob/master/tst-packet.c

Or use wireshark which has CAN support too.

> Or would a proper net_namespaces implementation for CAN be necessary?

When you use AF_PACKET you bypass the CAN network layer stuff.

Best regards,
Oliver