From owner-freebsd-ipfw@FreeBSD.ORG Mon Feb 28 13:52:24 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 741D616A4CE for ; Mon, 28 Feb 2005 13:52:24 +0000 (GMT) Received: from nm01omta023.dion.ne.jp (sns01-31-51.dion.ne.jp [61.117.3.73]) by mx1.FreeBSD.org (Postfix) with SMTP id 0D4C543D46 for ; Mon, 28 Feb 2005 13:52:23 +0000 (GMT) (envelope-from hongying.liu@s8.dion.ne.jp) Received: from [127.0.0.1] (unknown[222.6.131.156]) by nm01mta022.dion.ne.jp; Mon, 28 Feb 2005 22:52:20 +0900 Date: Mon, 28 Feb 2005 22:50:29 +0900 From: Hongying Liu To: freebsd-ipfw@freebsd.org Message-Id: <20050228225015.0EA3.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 13:52:24 -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