Subject: Re: Sending short raw packets using sendmsg() broke

From: Alan Cox <[email-masked]>
Date: Fri, 26 Feb 2016 14:44:34 +0000

On Thu, 2016-02-25 at 15:26 -0500, David Miller wrote:
> From: Heikki Hannikainen <[email-masked]>
> Date: Thu, 25 Feb 2016 21:36:07 +0200 (EET)
> 
> > Commit 9c7077622dd9174 added a check, ll_header_truncated(), which
> > requires that a packet transmitted using sendmsg() with PF_PACKET,
> > SOCK_RAW must be longer than dev->hard_header_len.
> 
> Fixed by:
> 
> commit 880621c2605b82eb5af91a2c94223df6f5a3fb64
> Author: Martin Blumenstingl <[email-masked]>
> Date:   Sun Nov 22 17:46:09 2015 +0100
> 
>     packet: Allow packets with only a header (but no payload)

The AX.25 case the header is variable length so this still doesn't fix
the regression as far as I can see.

Alan