From: Amos Jeffries <squid3@treenet.co.nz>
To: Brian <unixman83@gmail.com>
Cc: netfilter@vger.kernel.org
Subject: Re: TPROXY getting the remote/destination address via sockets API
Date: Sun, 27 Nov 2011 16:56:29 +1300 [thread overview]
Message-ID: <4ED1B4ED.4090808@treenet.co.nz> (raw)
In-Reply-To: <4ED1A034.9030802@gmail.com>
On 27/11/2011 3:28 p.m., Brian wrote:
> Using the latest TPROXY, how does one accurately get the
> destination/remote (and the source/localish) addresses of the
> transparent proxy connection?
Very reliable. At least we (Squid proxy) have had no problems with the
kernel 2.6.39+ TPROXY. Just some screwups on our side of the implementation.
>
> I would assume one address would be returned by the accept() call,
> which one, and how do I get the other?
You assume correct. The other is available from getsockname() on the new FD.
With TPROXY the IPs are reversed. That is; the IP which for normal
traffic would arrive on accept() appears instead on getsockname(), and
vice versa. So any software receiving TPROXY traffic is required to
isolate the listening port from normal traffic listening ports to avoid
problems interpreting the IPs.
HTH
AYJ
prev parent reply other threads:[~2011-11-27 3:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-27 2:28 TPROXY getting the remote/destination address via sockets API Brian
2011-11-27 3:56 ` Amos Jeffries [this message]
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