netdev - Re: About Raw socket, vlan + ip header

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Date:	Tue, 03 Mar 2015 09:03:01 -0800
From:	Philippe Troin <phil@...i.org>
To:	Sriram Raghunathan <sriram.r@....com>
Cc:	netdev@...r.kernel.org
Subject: Re: About Raw socket, vlan + ip header

On Tue, 2015-03-03 at 10:44 +0530, Sriram Raghunathan wrote:
> Writing a socket program where, I'm trying to construct a ether frame
> with vlan id and copying ip header there after. By using PF_PACKET
> family.
> 
> But when I do a sendto, the ip header is stripped off from the
> packet. Could you please let me know how to go about?

man 7 packet

...
       The  socket_type  is either SOCK_RAW for raw packets including the link
       level header or SOCK_DGRAM for  cooked  packets  with  the  link  level
       header  removed.   The  link level header information is available in a
       common format in a sockaddr_ll.  protocol is the  IEEE  802.3  protocol
...

Are you opening a SOCK_RAW or a SOCK_DGRAM PF_PACKET socket?

Phil.

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