netdev - Re: sendmsg() and vlan tags

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Message-ID: <1375232206.10515.48.camel@edumazet-glaptop>
Date:	Tue, 30 Jul 2013 17:56:46 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ani Sinha <ani@...stanetworks.com>
Cc:	netdev@...r.kernel.org
Subject: Re: sendmsg() and vlan tags

On Tue, 2013-07-30 at 17:29 -0700, Ani Sinha wrote:
> hello folks.
> 
> Can anyone please shed lights on this?
> 
> thanks,
> ani
> 
> 
> On Fri, Jul 26, 2013 at 2:30 PM, Ani Sinha <ani@...stanetworks.com> wrote:
> > Hi folks,
> >
> > We know that (since Linux 3.0) on raw sockets, the recvmsg() api
> > returns the vlan tag information of the packet in the packet aux data.
> > I looked at the kernel code and it seems on the TX side, in sendmsg(),
> > we do not accept the vlan tag data from userland for a raw packet. So
> > if the userland sends a raw packet using sendmsg() with vlan tag
> > information in aux data, it will be discarded.


What is the vlan tag information value in aux data ?


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