From owner-freebsd-ipfw@FreeBSD.ORG Mon Feb 28 13:42:52 2005 Return-Path: Delivered-To: freebsd-ipfw@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9E27316A4CE for ; Mon, 28 Feb 2005 13:42:52 +0000 (GMT) Received: from nm01omta029.dion.ne.jp (sns01-61-51.dion.ne.jp [61.117.3.79]) by mx1.FreeBSD.org (Postfix) with SMTP id 79B7643D2D for ; Mon, 28 Feb 2005 13:42:50 +0000 (GMT) (envelope-from hongying.liu@s8.dion.ne.jp) Received: from [127.0.0.1] (unknown[222.6.131.156]) by nm01mta029.dion.ne.jp; Mon, 28 Feb 2005 22:42:48 +0900 Date: Mon, 28 Feb 2005 22:40:56 +0900 From: Hongying Liu To: freebsd-ipfw@freebsd.org Message-Id: <20050228222930.3702.HONGYING.LIU@s8.dion.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.20 [ja] Subject: Can anybody help me with understanding how IPFW works X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Feb 2005 13:42:52 -0000 Hi, I think the packets is checked by using rules in kernel. I am reading the code of IPFW. but I still can't understand how the rules are passed from userland to kernel. I found sysctl is used to pass some info. but I don't think rules also are passed by using sysctl because there may be too many data. I also found raw socket is used in the userland source code. is raw socket is used to pass rules from userland to kernel? Thanks Liu