Re: [PATCH net] ipvlan: Ignore PACKET_LOOPBACK in handle_mode_l2()

[Paolo Abeni]

On 12/2/25 11:39 AM, Dmitry Skorodumov wrote:
> Packets with pkt_type == PACKET_LOOPBACK are captured by
> handle_frame() function, but they don't have L2 header.
> We should not process them in handle_mode_l2().
> 
> This doesn't affect old L2 functionality, since handling
> was anyway incorrect.
> 
> Handle them the same way as in br_handle_frame():
> just pass the skb.
> 
> To observe invalid behaviour, just start "ping -b" on bcast address
> of port-interface.
> 
> Fixes: 2ad7bf363841 ("ipvlan: Initial check-in of the IPVLAN driver.")
> Signed-off-by: Dmitry Skorodumov <skorodumov.dmitry@xxxxxxxxxx>

Since you appear the have momentum on ipvlan devel, please consider
adding self-tests for the issue you are addressing.

You can later leverage the same infra for functional coverage and that
will help your intended development.

Thanks,

Paolo