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

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Message-ID: <54F68BEA.8040605@nsn-intra.net>
Date:	Wed, 04 Mar 2015 10:06:58 +0530
From:	Sriram Raghunathan <srirr@...-intra.net>
To:	ext Philippe Troin <phil@...i.org>,
	Sriram Raghunathan <sriram.r@....com>
CC:	netdev@...r.kernel.org
Subject: Re: About Raw socket, vlan + ip header

Hi Philippe,

Using SOCK_RAW.

Sriram
On Tuesday 03 March 2015 10:33 PM, ext Philippe Troin wrote:
> 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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