From owner-freebsd-net@FreeBSD.ORG Fri Aug 1 21:09:33 2014 Return-Path: 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 ESMTPS id 1D9FDCE8; Fri, 1 Aug 2014 21:09:33 +0000 (UTC) Received: from mail.ipfw.ru (mail.ipfw.ru [IPv6:2a01:4f8:120:6141::2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id D627B2778; Fri, 1 Aug 2014 21:09:32 +0000 (UTC) Received: from v6.mpls.in ([2a02:978:2::5] helo=ws.su29.net) by mail.ipfw.ru with esmtpsa (TLSv1:DHE-RSA-AES128-SHA:128) (Exim 4.82 (FreeBSD)) (envelope-from ) id 1XDG7v-000MGI-Qa; Fri, 01 Aug 2014 20:56:19 +0400 Message-ID: <53DC01DE.3000000@FreeBSD.org> Date: Sat, 02 Aug 2014 01:08:46 +0400 From: "Alexander V. Chernikov" User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: freebsd-ipfw , "freebsd-net@freebsd.org" Subject: ipfw named objejcts, table values and syntax change X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Luigi Rizzo X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Aug 2014 21:09:33 -0000 Hello all. I'm currently working on to enhance ipfw in some areas. The most notable (and user-visible) change is named table support. The other one is support for different lookup algorithms for different key types. For example, new ipfw permits writing this: ipfw table tb1 create type cidr ipfw add allow ip from table(tl1) to any ipfw add allow ip from any lookup dst-ip tb1 ipfw table if1 create type iface ipfw add skipto tablearg ip from any to any via table(if1) or even this: ipfw table fl1 create type flow:src-ip,proto,dst-ip,dst-port ipfw table fl1 add 10.0.0.5,tcp,10.0.0.6,80 4444 ipfw add allow ip from any to any flow table(fl1) all these changes fully preserve backward compatibility. (actually tables needs now to be created before use and their type needs to match with opcode used, but new ipfw(8) performs auto-creation for cidr tables). There is another thing I'm going to change and I'm not sure I can keep the same compatibility level. Table values, from one point of view, can be classified to the following types: - skipto argument - fwd argument (*) - link to another object (nat, pipe, queue) - plain u32 (not bound to any object) (divert/tee,netgraph,tag/utag,limit) There are the following reasons why I think it is necessary to implement explicit table values typing (like tables): - Implementing fwd tablearg for IPv6 hosts requires indirection table - Converting nat/pipe instance ids to names renders values unusable - retiring old hack with storing saved pointer of found object/rule inside rule w/o proper locking - making faster skipto So, as the result, table will have lookup key type (already done), value type ('skipto', 'nexthop', 'nat', 'pipe', 'number', ..) and some additional restrictions (like inability to add non-existing nat instance id). This change will break (at least) scenarios where people are using one table for both nat/pipe instances (and keep nat ids in sync with pipe ones). For example: ipfw table 1 add 10.0.10.0/24 110 ipfw table 1 add 10.0.20.0/24 120 ipfw add 100 nat tablearg from table(1) to any via vlanX in .. ipfw add 500 pipe tablearg from table(1) to any via ix0 out It looks like it is not so easy to bind values for given table to different objects (or different tasks) (and lack of compatibility kills hope for MFC). Ideas?