From: Eric Dumazet <eric.dumazet@gmail.com>
To: "S, Sreeram" <Sreeram.S@netapp.com>
Cc: Ravishankar <cyberax82@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andy Lutomirski <luto@mit.edu>
Subject: RE: IP options IP_RECVOPTS on Linux 2.6 - Kindly comment
Date: Fri, 27 Apr 2012 07:31:41 +0200 [thread overview]
Message-ID: <1335504701.2775.67.camel@edumazet-glaptop> (raw)
In-Reply-To: <402249329CEF3E49AACD14423D8386EE03C6B5E5@SACEXCMBX03-PRD.hq.netapp.com>
On Fri, 2012-04-27 at 05:25 +0000, S, Sreeram wrote:
> Thanks a lot Ravi for the response.
>
> But, the IP header is 40 bytes and so I think I should expect all
> those 40 bytes to be returned to my program when I enable this option.
> Isnt that correct ?
>
> Here, TTL and TOS are getting returned because I have explicitly
> enabled the returns of IP_RECVTTL and IP_RECVTOS to my program using
> setsockopt. Otherwise even they wouldn’t have been returned.
>
> I still think that the kernel is not returning what it should return
> when I enable IP_RECVOPTS. Please correct me if you think I am wrong.
>
>
>
> Also, what are the other ways of getting the IP header other than RAW
> sockets, if the current approach does not work?
>
>
IP options are not IP header.
Try to send an IP packets with options, and your program will work.
next prev parent reply other threads:[~2012-04-27 5:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-26 9:37 S, Sreeram
[not found] ` <CAO_LctSkkqctOEaC_CPDB7yHCzgAYe+G3rPQBFT3jh1-cCT22A@mail.gmail.com>
[not found] ` <402249329CEF3E49AACD14423D8386EE03C6B5E5@SACEXCMBX03-PRD.hq.netapp.com>
2012-04-27 5:31 ` Eric Dumazet [this message]
2012-04-27 5:34 ` S, Sreeram
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1335504701.2775.67.camel@edumazet-glaptop \
--to=eric.dumazet@gmail.com \
--cc=Sreeram.S@netapp.com \
--cc=cyberax82@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@mit.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®