From owner-freebsd-net@FreeBSD.ORG  Mon Sep 23 04:10:14 2013
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id 7AD9F6E1
 for <freebsd-net@freebsd.org>; Mon, 23 Sep 2013 04:10:14 +0000 (UTC)
 (envelope-from julian@freebsd.org)
Received: from vps1.elischer.org (vps1.elischer.org [204.109.63.16])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 4CF842A1E
 for <freebsd-net@freebsd.org>; Mon, 23 Sep 2013 04:10:14 +0000 (UTC)
Received: from jre-mbp.elischer.org
 (ppp121-45-245-177.lns20.per2.internode.on.net [121.45.245.177])
 (authenticated bits=0)
 by vps1.elischer.org (8.14.6/8.14.6) with ESMTP id r8N4AATO023018
 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO);
 Sun, 22 Sep 2013 21:10:12 -0700 (PDT)
 (envelope-from julian@freebsd.org)
Message-ID: <523FBF24.50004@freebsd.org>
Date: Mon, 23 Sep 2013 12:10:12 +0800
From: Julian Elischer <julian@freebsd.org>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8;
 rv:17.0) Gecko/20130801 Thunderbird/17.0.8
MIME-Version: 1.0
To: Ihsan Junaidi Ibrahim <ihsan@grep.my>
Subject: Re: Programmatically forwarding packets to outgoing interface
References: <4DC4F001-D430-4110-81DA-279F3D01AD33@grep.my>
In-Reply-To: <4DC4F001-D430-4110-81DA-279F3D01AD33@grep.my>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 23 Sep 2013 04:10:14 -0000

On 9/23/13 11:55 AM, Ihsan Junaidi Ibrahim wrote:
> Hi folks,
>
> I'm trying to learn building a VPN-type application on FreeBSD and I'm currently stuck at trying to route packets to outgoing interface.
>
> I've managed to push/pop IP packets in a tun(4) interface but now that I can read the inner packet header, I need to route the payload out of the box. I'm not quite sure which API I need to use to achieve this.
>
> The inner packets can be of either IPv4 or IPv6.
>
> Thanks.
> _______________________________________________
> freebsd-net@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
>
>
you can try use ipfw and its 'fwd' option to reroute packets
not sure if fwd works with ipv6.. I've never tried..