From owner-freebsd-net@freebsd.org  Sun Dec 11 11:58:14 2016
Return-Path: <owner-freebsd-net@freebsd.org>
Delivered-To: freebsd-net@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id D4BDBC726D8
 for <freebsd-net@mailman.ysv.freebsd.org>;
 Sun, 11 Dec 2016 11:58:14 +0000 (UTC) (envelope-from slw@zxy.spb.ru)
Received: from zxy.spb.ru (zxy.spb.ru [195.70.199.98])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 989D4189C;
 Sun, 11 Dec 2016 11:58:14 +0000 (UTC) (envelope-from slw@zxy.spb.ru)
Received: from slw by zxy.spb.ru with local (Exim 4.86 (FreeBSD))
 (envelope-from <slw@zxy.spb.ru>)
 id 1cG2lW-0003Ix-Lt; Sun, 11 Dec 2016 14:58:02 +0300
Date: Sun, 11 Dec 2016 14:58:02 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: "Andrey V. Elsukov" <ae@FreeBSD.org>
Cc: Eugene Grosbein <eugen@grosbein.net>, freebsd-net@FreeBSD.org
Subject: Re: [RFC/RFT] projects/ipsec
Message-ID: <20161211115802.GD31311@zxy.spb.ru>
References: <2bd32791-944f-2417-41e9-e0fe1c705502@FreeBSD.org>
 <584D18D1.8090400@grosbein.net>
 <36fa749c-f284-1d96-704c-b7118a574dd0@FreeBSD.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=koi8-r
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <36fa749c-f284-1d96-704c-b7118a574dd0@FreeBSD.org>
User-Agent: Mutt/1.5.24 (2015-08-30)
X-SA-Exim-Connect-IP: <locally generated>
X-SA-Exim-Mail-From: slw@zxy.spb.ru
X-SA-Exim-Scanned: No (on zxy.spb.ru); SAEximRunCond expanded to false
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <https://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: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 11 Dec 2016 11:58:14 -0000

On Sun, Dec 11, 2016 at 02:33:43PM +0300, Andrey V. Elsukov wrote:

> On 11.12.2016 12:13, Eugene Grosbein wrote:
> > 11.12.2016 6:07, Andrey V. Elsukov пишет:
> > 
> >> * use transport mode IPsec for forwarded IPv4 packets now unsupported.
> >> This matches the IPv6 behavior, and since we can handle the replies, I
> >> think it is useless.
> > 
> > Does it include a case of packets going from LAN and forwarded into
> > gif(4) tunnel
> > connected to remote IPSEC gateway and encrypted with transport mode?
> > 
> > That is, will this configuration break?
> 
> No. An encapsulated by gif(4) packet is considered as own packet. The
> described change is related to transport mode policies, that are match
> forwarded packets, i.e. when source and destination addresses are not
> our own. In this case we can't handle the returned packets.

What difference with source packets?
Whu you can handle sourced and can't handle returned packets?