netdev - Re: sendmsg() and vlan tags

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 30 Jul 2013 17:29:30 -0700
From:	Ani Sinha <ani@...stanetworks.com>
To:	netdev@...r.kernel.org
Subject: Re: sendmsg() and vlan tags

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.
>
> Is my analysis correct?
>
> Cheers,
> Ani



-- 
Ani
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html