netdev - sendmsg() and vlan tags

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Message-ID: <CAOxq_8Ni_WszNj0RW++2jdmLwBxbQCJSSC-AS1Ux5TgMEpd2iA@mail.gmail.com>
Date:	Fri, 26 Jul 2013 14:30:55 -0700
From:	Ani Sinha <ani@...stanetworks.com>
To:	netdev@...r.kernel.org
Subject: sendmsg() and vlan tags

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.

Is my analysis correct?

Cheers,
Ani
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