From owner-freebsd-net@FreeBSD.ORG  Tue Jul 10 13:40:06 2012
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: net@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id F0218106566B;
	Tue, 10 Jul 2012 13:40:05 +0000 (UTC)
	(envelope-from glebius@FreeBSD.org)
Received: from cell.glebius.int.ru (glebius.int.ru [81.19.64.117])
	by mx1.freebsd.org (Postfix) with ESMTP id 739ED8FC08;
	Tue, 10 Jul 2012 13:40:05 +0000 (UTC)
Received: from cell.glebius.int.ru (localhost [127.0.0.1])
	by cell.glebius.int.ru (8.14.5/8.14.5) with ESMTP id q6ADe44I098633;
	Tue, 10 Jul 2012 17:40:04 +0400 (MSK)
	(envelope-from glebius@FreeBSD.org)
Received: (from glebius@localhost)
	by cell.glebius.int.ru (8.14.5/8.14.5/Submit) id q6ADe438098632;
	Tue, 10 Jul 2012 17:40:04 +0400 (MSK)
	(envelope-from glebius@FreeBSD.org)
X-Authentication-Warning: cell.glebius.int.ru: glebius set sender to
	glebius@FreeBSD.org using -f
Date: Tue, 10 Jul 2012 17:40:04 +0400
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: net@FreeBSD.org
Message-ID: <20120710134004.GE21957@FreeBSD.org>
References: <4FFA894D.9050104@FreeBSD.org>
	<20120709.170813.339720376082380726.hrs@allbsd.org>
	<4FFA9723.5000301@FreeBSD.org>
	<20120710.053002.914215153752773154.hrs@allbsd.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=koi8-r
Content-Disposition: inline
In-Reply-To: <20120710.053002.914215153752773154.hrs@allbsd.org>
User-Agent: Mutt/1.5.21 (2010-09-15)
Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org,
	src-committers@FreeBSD.org, melifaro@FreeBSD.org
Subject: Re: svn commit: r238277 - in head: etc/defaults etc/rc.d sbin/ipfw
 share/man/man5 sys/netinet/ipfw
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/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: Tue, 10 Jul 2012 13:40:06 -0000

  Hiroki,

On Tue, Jul 10, 2012 at 05:30:02AM +0900, Hiroki Sato wrote:
H>  Given that we add a new API to
H>  enumerate the interfaces including bpf-only providers with fake
H>  ifnets, which providers/utilities should be converted to use it?  IMO
H>  usbusN would be a reasonable target but others still need a real
H>  ifnet.  In my understanding, the advantage of using a fake ifnet is
H>  just to prevent it from appearing as an interface.  Is it correct?

IMO, neither ipfwlog0 nor pflog0 nor pfsync0 need 'struct ifnet'. They
are pure providers for tcpdump only.

(pfsync0 also consumes if_ioctl to configure itself, but this can be axed
and configuring should be done via /dev/pf as all other parts of pf.)

As soon as Alexander comes with API that makes it possible to create
BPF "dumping points" in kernel that aren't tied to 'struct ifnet',
I'd be happy to remove pfsync/pflog/ipfwlog as interfaces.

-- 
Totus tuus, Glebius.