From owner-freebsd-ipfw@FreeBSD.ORG Sun Jul 30 18:02:00 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 C897F16A4DD for ; Sun, 30 Jul 2006 18:02:00 +0000 (UTC) (envelope-from adam.egan@gmail.com) Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.185]) by mx1.FreeBSD.org (Postfix) with ESMTP id F099643D53 for ; Sun, 30 Jul 2006 18:01:59 +0000 (GMT) (envelope-from adam.egan@gmail.com) Received: by nf-out-0910.google.com with SMTP id n29so298001nfc for ; Sun, 30 Jul 2006 11:01:58 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Bf4FnznsCK/81dmix6zt7IZ1qgQnXwe9i3HLUBYmDOEZ6iG20dQOQk3cdvim8sfEFWtLCCv/lz/yT7RzDSSwTPA0lY7j0CbVfBRiGYDyG3tJliyqMNBpSaQHrqygFbRrPLBWoWHckTCrOvqe89YNf/zjrZEGTBZGhF3MfOaR7w8= Received: by 10.49.8.15 with SMTP id l15mr1374341nfi; Sun, 30 Jul 2006 11:01:58 -0700 (PDT) Received: by 10.48.207.18 with HTTP; Sun, 30 Jul 2006 11:01:58 -0700 (PDT) Message-ID: <28745bbf0607301101j5cda847cn9eeef3a29633398e@mail.gmail.com> Date: Sun, 30 Jul 2006 19:01:58 +0100 From: "Adam Egan" To: freebsd-ipfw@freebsd.org In-Reply-To: <44CA4F80.5030009@pro.sk> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <28745bbf0607270947i6d71369fg5c1403b2d6e36219@mail.gmail.com> <28745bbf0607280412tdff38dck9df78fd0fc363fff@mail.gmail.com> <44CA4F80.5030009@pro.sk> Subject: Re: ipfw and natd routing problems X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 30 Jul 2006 18:02:00 -0000 Hi Peter, In your previous email you said: > BE AWARE YOUR 'FIREWALL' IS COMPLETELY OPEN FOR ANY CONNECTION FROM > INSIDE AND EVEN OUTSIDE!!! I was wondering if it was possible to not have my firewall open in such a way? I want only connections to port 80 and 6600-6625 (from where does not matter), all other ports are to be closed unless opened by natd dynamically (i.e. irc, ftp, etc). Thank you to everybody who has helped so far, it is appreciated! Adam From owner-freebsd-ipfw@FreeBSD.ORG Mon Jul 31 11:03:53 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 9FA5B16A60D for ; Mon, 31 Jul 2006 11:03:53 +0000 (UTC) (envelope-from owner-bugmaster@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1084743D4C for ; Mon, 31 Jul 2006 11:03:01 +0000 (GMT) (envelope-from owner-bugmaster@freebsd.org) Received: from freefall.freebsd.org (peter@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.4/8.13.4) with ESMTP id k6VB31Qm051838 for ; Mon, 31 Jul 2006 11:03:01 GMT (envelope-from owner-bugmaster@freebsd.org) Received: (from peter@localhost) by freefall.freebsd.org (8.13.4/8.13.4/Submit) id k6VB30jp051834 for freebsd-ipfw@freebsd.org; Mon, 31 Jul 2006 11:03:00 GMT (envelope-from owner-bugmaster@freebsd.org) Date: Mon, 31 Jul 2006 11:03:00 GMT Message-Id: <200607311103.k6VB30jp051834@freefall.freebsd.org> X-Authentication-Warning: freefall.freebsd.org: peter set sender to owner-bugmaster@freebsd.org using -f From: FreeBSD bugmaster To: freebsd-ipfw@FreeBSD.org Cc: Subject: Current problem reports assigned to you X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2006 11:03:53 -0000 Current FreeBSD problem reports Critical problems Serious problems S Submitted Tracker Resp. Description ------------------------------------------------------------------------------- o [2003/04/22] kern/51274 ipfw [ipfw] [patch] ipfw2 create dynamic rules f [2003/04/24] kern/51341 ipfw [ipfw] [patch] ipfw rule 'deny icmp from o [2004/11/13] kern/73910 ipfw [ipfw] serious bug on forwarding of packe o [2004/11/19] kern/74104 ipfw [ipfw] ipfw2/1 conflict not detected or r o [2005/03/13] conf/78762 ipfw [ipfw] [patch] /etc/rc.d/ipfw should exce o [2005/05/11] bin/80913 ipfw [patch] /sbin/ipfw2 silently discards MAC o [2005/11/08] kern/88659 ipfw [modules] ipfw and ip6fw do not work prop o [2006/02/13] kern/93300 ipfw ipfw pipe lost packets o [2006/03/29] kern/95084 ipfw [ipfw] [patch] IPFW2 ignores "recv/xmit/v o [2006/05/19] kern/97504 ipfw [ipfw] IPFW Rules bug o [2006/05/26] kern/97951 ipfw [ipfw] [patch] ipfw does not tie interfac o [2006/06/11] kern/98831 ipfw [ipfw] ipfw has UDP hickups 12 problems total. Non-critical problems S Submitted Tracker Resp. Description ------------------------------------------------------------------------------- a [2001/04/13] kern/26534 ipfw [ipfw] Add an option to ipfw to log gid/u o [2002/12/10] kern/46159 ipfw [ipfw] [patch] ipfw dynamic rules lifetim o [2003/02/11] kern/48172 ipfw [ipfw] [patch] ipfw does not log size and o [2003/03/10] kern/49086 ipfw [ipfw] [patch] Make ipfw2 log to differen o [2003/04/09] bin/50749 ipfw [ipfw] [patch] ipfw2 incorrectly parses p o [2003/08/26] kern/55984 ipfw [ipfw] [patch] time based firewalling sup o [2003/12/30] kern/60719 ipfw [ipfw] Headerless fragments generate cryp o [2004/08/03] kern/69963 ipfw [ipfw] install_state warning about alread o [2004/09/04] kern/71366 ipfw [ipfw] "ipfw fwd" sometimes rewrites dest o [2004/10/22] kern/72987 ipfw [ipfw] ipfw/dummynet pipe/queue 'queue [B o [2004/10/29] kern/73276 ipfw [ipfw] [patch] ipfw2 vulnerability (parse o [2005/03/13] bin/78785 ipfw [ipfw] [patch] ipfw verbosity locks machi o [2005/05/05] kern/80642 ipfw [ipfw] [patch] ipfw small patch - new RUL o [2005/06/28] kern/82724 ipfw [ipfw] [patch] Add setnexthop and default o [2005/10/05] kern/86957 ipfw [ipfw] [patch] ipfw mac logging o [2005/10/07] kern/87032 ipfw [ipfw] [patch] ipfw ioctl interface imple o [2006/01/16] kern/91847 ipfw [ipfw] ipfw with vlanX as the device o [2006/02/16] kern/93422 ipfw ipfw divert rule no longer works in 6.0 ( o [2006/03/31] bin/95146 ipfw [ipfw][patch]ipfw -p option handler is bo 19 problems total. From owner-freebsd-ipfw@FreeBSD.ORG Mon Jul 31 12:16:02 2006 Return-Path: X-Original-To: freebsd-ipfw@FreeBSD.org 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 BFE5516A4DF for ; Mon, 31 Jul 2006 12:16:02 +0000 (UTC) (envelope-from ianf@hetzner.co.za) Received: from hetzner.co.za (office.dc2.cpt.your-server.co.za [196.7.147.230]) by mx1.FreeBSD.org (Postfix) with ESMTP id D01E643D6B for ; Mon, 31 Jul 2006 12:15:57 +0000 (GMT) (envelope-from ianf@hetzner.co.za) Received: from localhost ([127.0.0.1] helo=ian.hetzner.africa) by hetzner.co.za with esmtp (Exim 4.62 (FreeBSD)) (envelope-from ) id 1G7Wge-0005G0-7G for freebsd-ipfw@FreeBSD.org; Mon, 31 Jul 2006 14:15:56 +0200 To: freebsd-ipfw@FreeBSD.org From: Ian FREISLICH X-Attribution: BOFH Date: Mon, 31 Jul 2006 14:15:56 +0200 Sender: ianf@hetzner.co.za Message-Id: Cc: Subject: ipfw performance and random musings. X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2006 12:16:02 -0000 Hi I was wondering if anyone here had any ideas for improving the performance (packet rate) of ipfw. I have about 500 interfaces on my firewall and I need to match and filter packets on a per interface basis. I've found that while the server can move in excess of 360kpps bewteen arbitrary interfaces using about 5% CPU, if I turn on the firewall, my average packet rate falls off to about 60kpps on a UP system and 90kpps on a SMP system. The maximum rate I can forward packets with ipfw enabled is 120kpps and that is with 1 rule allowing ip from any to any. At these maximum rates, CPU utilization is close to 100% on both CPUs in the interrupt handler. This low packet rate and high CPU utilization does not make the system effective (for other users) while filtering a DoS attack perpetrated by a host behind the firewall. Perhaps these are 2 easy wins: 1. Change the order of the case statements in ipfw_chk() to move more frequently used items to the top. The options seem to have been added mostly in chronological feature order, rather than reverse most frequently used order. 2. Caching of ifp->if_index in the rule 'microinstructions' to remove the need for a strncmp to match interface names. Might be tricky if interfaces are destroyed and recreated without invalidating this cache. Then, state is not interface aware. I have used this effect to inject packets from one network to another where the rules on the other interface specifically deny these packets. There is a patch in kern/97951 to fix this problem. Ian -- Ian Freislich From owner-freebsd-ipfw@FreeBSD.ORG Mon Jul 31 14:21:47 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 7422916A4DE for ; Mon, 31 Jul 2006 14:21:47 +0000 (UTC) (envelope-from rizzo@icir.org) Received: from xorpc.icir.org (xorpc.icir.org [192.150.187.68]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1E04C43D53 for ; Mon, 31 Jul 2006 14:21:47 +0000 (GMT) (envelope-from rizzo@icir.org) Received: from xorpc.icir.org (localhost [127.0.0.1]) by xorpc.icir.org (8.12.11/8.12.11) with ESMTP id k6VELkYK077175; Mon, 31 Jul 2006 07:21:46 -0700 (PDT) (envelope-from rizzo@xorpc.icir.org) Received: (from rizzo@localhost) by xorpc.icir.org (8.12.11/8.12.3/Submit) id k6VELjh3077174; Mon, 31 Jul 2006 07:21:45 -0700 (PDT) (envelope-from rizzo) Date: Mon, 31 Jul 2006 07:21:45 -0700 From: Luigi Rizzo To: Ian FREISLICH Message-ID: <20060731072145.A77050@xorpc.icir.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from if@hetzner.co.za on Mon, Jul 31, 2006 at 02:15:56PM +0200 Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw performance and random musings. X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2006 14:21:47 -0000 On Mon, Jul 31, 2006 at 02:15:56PM +0200, Ian FREISLICH wrote: > Hi > > I was wondering if anyone here had any ideas for improving the > performance (packet rate) of ipfw. > > I have about 500 interfaces on my firewall and I need to match and > filter packets on a per interface basis. > > I've found that while the server can move in excess of 360kpps > bewteen arbitrary interfaces using about 5% CPU, if I turn on the > firewall, my average packet rate falls off to about 60kpps on a UP > system and 90kpps on a SMP system. The maximum rate I can forward > packets with ipfw enabled is 120kpps and that is with 1 rule allowing this is a very strange number as it (120kpps with ipfw enabled) is the performance i got in 2002 with a 750 MHz machine. This was on 4.X - haven't checked recently on 6.x, there might be some issue that has been introduced. If you have a chance to try a 4.11 kernel (even a picobsd one) on the same hardware it would be good to see some numbers. > Perhaps these are 2 easy wins: > > 1. Change the order of the case statements in ipfw_chk() to move > more frequently used items to the top. The options seem to that has no impact in a sane compiler - the switch() is compiled as a jump table and i don't see how gcc could do differently given the small range of opcodes (6-8 bits). > 2. Caching of ifp->if_index in the rule 'microinstructions' to > remove the need for a strncmp to match interface names. Might > be tricky if interfaces are destroyed and recreated without > invalidating this cache. this is also a minor optimization - a strcmp is not that bad, i think it is far worse to have to scan a long list of names. > Then, state is not interface aware. I have used this effect to yes i agree that state is a bit limited, we only use the 5-tuple but maybe we would need more info - the problem is, what more ? do we always want an interface name or other metadata ? this is a design problem in the first place. cheers luigi From owner-freebsd-ipfw@FreeBSD.ORG Wed Aug 2 05:33:31 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 1803A16A4DE for ; Wed, 2 Aug 2006 05:33:31 +0000 (UTC) (envelope-from if@hetzner.co.za) Received: from hetzner.co.za (office.dc2.cpt.your-server.co.za [196.7.147.230]) by mx1.FreeBSD.org (Postfix) with ESMTP id 967BB43D49 for ; Wed, 2 Aug 2006 05:33:29 +0000 (GMT) (envelope-from if@hetzner.co.za) Received: from localhost ([127.0.0.1] helo=ian.hetzner.africa) by hetzner.co.za with esmtp (Exim 4.62 (FreeBSD)) (envelope-from ) id 1G89ME-000H0o-8A; Wed, 02 Aug 2006 07:33:26 +0200 To: Tyrone.VanDerHaar@TelecityRedbus.se From: Ian FREISLICH In-Reply-To: Message from of "Tue, 30 May 2006 16:31:35 +0200." X-Attribution: BOFH Date: Wed, 02 Aug 2006 07:33:26 +0200 Message-Id: Cc: freebsd-ipfw@freebsd.org Subject: Re: CARP spanning-tree Vlan X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Aug 2006 05:33:31 -0000 Tyrone wrote: > Can anyone explain to me why I can't get my CARP interfaces up again > after changing the spanning-tree version on our customer switch? Did you ever get this working? Since your message, I started playing around with CARP and I've noticed a few things. 1. Renaming a CARP interface makes it either loose it's vhid/pass or stops it working for some other reason. 2. Downing and upping the physical interface makes the carp interface stop working. > We have 2x switches connected to our freebsd routers and a fibre link > between the switches. > > Customer have a port on each switch going to a third switch and between > the 3 switches we have spanning tree running for redundant paths. > > I changed the spanning-tree on the customer switch (switch 3) and now my > carp interface look like this > > carp135: flags=3D49 mtu 1500 > > inet xxx.xxx.xxx.2 netmask 0xffffff00 > > carp: MASTER vhid 7 advbase 1 advskew 100 > > carp135: flags=3D49 mtu 1500 > > inet xxx.xxx.xxx.2 netmask 0xffffff00 > > carp: MASTER vhid 7 advbase 1 advskew 0 I've noticed that my carp intefaces do this when: 1. The switch stops forwarding 2. The firewall blocks the carp broadcast 3. The carp inteface is "in" a vlan interface and vlanhwtag is enabled on the card and the interface is placed in promiscuous mode - the carp driver does this. (the card just stops tagging frames). 4. The inteface the carp inteface is "in" was downed and upped. 3 and 4 can be fixed by re-ifconfig of all the interfaces involved. It sounds more like this is a switch issue and that the carp broadcasts aren't making it through from your one router to the other. What is the interface state of the STP on all your switches? Ian -- Ian Freislich From owner-freebsd-ipfw@FreeBSD.ORG Wed Aug 2 10:27:48 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 5B46416A4DE for ; Wed, 2 Aug 2006 10:27:48 +0000 (UTC) (envelope-from if@hetzner.co.za) Received: from hetzner.co.za (office.dc2.cpt.your-server.co.za [196.7.147.230]) by mx1.FreeBSD.org (Postfix) with ESMTP id B8CD943D45 for ; Wed, 2 Aug 2006 10:27:47 +0000 (GMT) (envelope-from if@hetzner.co.za) Received: from localhost ([127.0.0.1] helo=ian.hetzner.africa) by hetzner.co.za with esmtp (Exim 4.62 (FreeBSD)) (envelope-from ) id 1G8Dwx-000HwP-Am; Wed, 02 Aug 2006 12:27:39 +0200 To: Luigi Rizzo From: Ian FREISLICH In-Reply-To: Message from Luigi Rizzo of "Mon, 31 Jul 2006 07:21:45 MST." <20060731072145.A77050@xorpc.icir.org> X-Attribution: BOFH Date: Wed, 02 Aug 2006 12:27:39 +0200 Message-Id: Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw performance and random musings. X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Aug 2006 10:27:48 -0000 Luigi Rizzo wrote: > On Mon, Jul 31, 2006 at 02:15:56PM +0200, Ian FREISLICH wrote: > > Hi > > > > I was wondering if anyone here had any ideas for improving the > > performance (packet rate) of ipfw. > > > > I have about 500 interfaces on my firewall and I need to match and > > filter packets on a per interface basis. > > > > I've found that while the server can move in excess of 360kpps > > bewteen arbitrary interfaces using about 5% CPU, if I turn on the > > firewall, my average packet rate falls off to about 60kpps on a UP > > system and 90kpps on a SMP system. The maximum rate I can forward > > packets with ipfw enabled is 120kpps and that is with 1 rule allowing > > this is a very strange number as it (120kpps with ipfw enabled) > is the performance i got in 2002 with a 750 MHz machine. hrmph. This is a dual 2.8GHz Xeon. SMP does not pessimise performance. It would be nice to get near wire speed filtering. > This was on 4.X - haven't checked recently on 6.x, there might > be some issue that has been introduced. > If you have a chance to try a 4.11 kernel (even a picobsd one) > on the same hardware it would be good to see some numbers. I'll see if I can get some numbers on an older version. I'm running -CURRENT on this box for various reasons. I won't be able to perform the test on this hardware. > > Perhaps these are 2 easy wins: > > > > 1. Change the order of the case statements in ipfw_chk() to move > > more frequently used items to the top. The options seem to > > that has no impact in a sane compiler - the switch() is compiled > as a jump table and i don't see how gcc could do differently > given the small range of opcodes (6-8 bits). Ok, I didn't notice that the opcodes were an enum and I guess it makes sense that the compiler to optimise that into an indirect jump. > > 2. Caching of ifp->if_index in the rule 'microinstructions' to > > remove the need for a strncmp to match interface names. Might > > be tricky if interfaces are destroyed and recreated without > > invalidating this cache. > > this is also a minor optimization - a strcmp is not that bad, > i think it is far worse to have to scan a long list of names. Maybe I'll stick an inlined version in and see if that changes things. I can also give the ifp->if_index cache a go. Since I need to virualise the firewall, I need a set of rules for each interface. I can't think of another way of sharing the firewall beween a few hundred customers than by doing this: 2 skipto 65000 ip from any to me 2 skipto 65000 ip from me to any 10 skipto 100 ip from any to any via vlan1 11 skipto 200 ip from any to any via vlan2 ... 99 deny ip from any to any #Rules for vlan1 100 ... ... 199 deny ip from any to any #Rules for vlan2 200 ... ... 299 deny ip from any to any #Rules for me 65000... So I land up doing lots of interface name comparisons, which may be an atypical work load. > > Then, state is not interface aware. I have used this effect to > > yes i agree that state is a bit limited, we only use the 5-tuple > but maybe we would need more info - the problem is, what more ? > do we always want an interface name or other metadata ? Interface would be a good start: allow tcp from any to any in recv vlan1 keep-state deny ip from any to any out via vlan1 allow tcp from any to any in recv vlan2 keep-state deny ip from any to any out xmit vlan2 check-state Will allow anything connected to vlan1 to get it's TCP packets to something on vlan2 and vice versa. > this is a design problem in the first place. Could you please have a look at the patch (kern/97951). Just storing the interface if_index with the state would make me a very happy man. Even if it's with a sysctl 'net.inet.ip.fw.interface_state'. Ian -- Ian Freislich From owner-freebsd-ipfw@FreeBSD.ORG Wed Aug 2 10:38:00 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 F37E816A4DA for ; Wed, 2 Aug 2006 10:37:59 +0000 (UTC) (envelope-from rizzo@icir.org) Received: from xorpc.icir.org (xorpc.icir.org [192.150.187.68]) by mx1.FreeBSD.org (Postfix) with ESMTP id B441E43D45 for ; Wed, 2 Aug 2006 10:37:59 +0000 (GMT) (envelope-from rizzo@icir.org) Received: from xorpc.icir.org (localhost [127.0.0.1]) by xorpc.icir.org (8.12.11/8.12.11) with ESMTP id k72Abxrh013620; Wed, 2 Aug 2006 03:37:59 -0700 (PDT) (envelope-from rizzo@xorpc.icir.org) Received: (from rizzo@localhost) by xorpc.icir.org (8.12.11/8.12.3/Submit) id k72Abxuq013619; Wed, 2 Aug 2006 03:37:59 -0700 (PDT) (envelope-from rizzo) Date: Wed, 2 Aug 2006 03:37:59 -0700 From: Luigi Rizzo To: Ian FREISLICH Message-ID: <20060802033759.A13393@xorpc.icir.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from if@hetzner.co.za on Wed, Aug 02, 2006 at 12:27:39PM +0200 Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw performance and random musings. X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Aug 2006 10:38:00 -0000 On Wed, Aug 02, 2006 at 12:27:39PM +0200, Ian FREISLICH wrote: ... > things. I can also give the ifp->if_index cache a go. Since I > need to virualise the firewall, I need a set of rules for each > interface. I can't think of another way of sharing the firewall > beween a few hundred customers than by doing this: that's too heavyweight, perhaps you need to implement a new microinstruction to hash the interface name and do an indirect jump to the right target. Although the syntax can be tricky, something like hash-if name:base:delta[,name:base:delta] where name is the basename of the interface (e.g. vlan) so that packets from interface fooX would jump to base+X*delta cheers luigi From owner-freebsd-ipfw@FreeBSD.ORG Wed Aug 2 11:42:54 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 14B0516A4DD for ; Wed, 2 Aug 2006 11:42:54 +0000 (UTC) (envelope-from if@hetzner.co.za) Received: from hetzner.co.za (office.dc2.cpt.your-server.co.za [196.7.147.230]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7C59543D4C for ; Wed, 2 Aug 2006 11:42:53 +0000 (GMT) (envelope-from if@hetzner.co.za) Received: from localhost ([127.0.0.1] helo=ian.hetzner.africa) by hetzner.co.za with esmtp (Exim 4.62 (FreeBSD)) (envelope-from ) id 1G8F7j-000ICo-Pv; Wed, 02 Aug 2006 13:42:51 +0200 To: Luigi Rizzo From: Ian FREISLICH In-Reply-To: Message from Luigi Rizzo of "Wed, 02 Aug 2006 03:37:59 MST." <20060802033759.A13393@xorpc.icir.org> X-Attribution: BOFH Date: Wed, 02 Aug 2006 13:42:51 +0200 Message-Id: Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw performance and random musings. X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Aug 2006 11:42:54 -0000 Luigi Rizzo wrote: > On Wed, Aug 02, 2006 at 12:27:39PM +0200, Ian FREISLICH wrote: > ... > > things. I can also give the ifp->if_index cache a go. Since I > > need to virualise the firewall, I need a set of rules for each > > interface. I can't think of another way of sharing the firewall > > beween a few hundred customers than by doing this: > > that's too heavyweight, perhaps you need to implement a > new microinstruction to hash the interface name and do an indirect > jump to the right target. Although the syntax can be tricky, something > like > hash-if name:base:delta[,name:base:delta] > > where name is the basename of the interface (e.g. vlan) > so that packets from interface fooX would jump to base+X*delta So, this will get performance to approach 120kpps, that will still need to do a linear search of the rule set to find the next rule, which I see I have to do anyway. For some reason I thought skipto used a pointer to the next rule. You're thinking somewhere on the lines of: skipto base hash-if from to delta [offset ] so skipto 1000 hash-if vlan from 1 to 500 delta 100 will match vlan1 to vlan500 and skipto: vlan1 rule 1100 ... vlan500 rule 51000 and skipto 1000 hash-if vlan from 1000 to 1500 delta 100 offset -100000 will match vlan1000 to vlan1500 and skipto: vlan1000 rule 1000 ... vlan1500 rule 51000 I'll see if I can figure out how to do this. Ian -- Ian Freislich From owner-freebsd-ipfw@FreeBSD.ORG Wed Aug 2 19:40:57 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 D381316A4DE for ; Wed, 2 Aug 2006 19:40:57 +0000 (UTC) (envelope-from rizzo@icir.org) Received: from xorpc.icir.org (xorpc.icir.org [192.150.187.68]) by mx1.FreeBSD.org (Postfix) with ESMTP id A641443D66 for ; Wed, 2 Aug 2006 19:40:54 +0000 (GMT) (envelope-from rizzo@icir.org) Received: from xorpc.icir.org (localhost [127.0.0.1]) by xorpc.icir.org (8.12.11/8.12.11) with ESMTP id k72Jer21022312; Wed, 2 Aug 2006 12:40:53 -0700 (PDT) (envelope-from rizzo@xorpc.icir.org) Received: (from rizzo@localhost) by xorpc.icir.org (8.12.11/8.12.3/Submit) id k72Jerd8022311; Wed, 2 Aug 2006 12:40:53 -0700 (PDT) (envelope-from rizzo) Date: Wed, 2 Aug 2006 12:40:53 -0700 From: Luigi Rizzo To: Ian FREISLICH Message-ID: <20060802124053.A22010@xorpc.icir.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from if@hetzner.co.za on Wed, Aug 02, 2006 at 01:42:51PM +0200 Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw performance and random musings. X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Aug 2006 19:40:57 -0000 On Wed, Aug 02, 2006 at 01:42:51PM +0200, Ian FREISLICH wrote: > Luigi Rizzo wrote: > > On Wed, Aug 02, 2006 at 12:27:39PM +0200, Ian FREISLICH wrote: > > ... > > > things. I can also give the ifp->if_index cache a go. Since I > > > need to virualise the firewall, I need a set of rules for each > > > interface. I can't think of another way of sharing the firewall > > > beween a few hundred customers than by doing this: > > > > that's too heavyweight, perhaps you need to implement a > > new microinstruction to hash the interface name and do an indirect > > jump to the right target. Although the syntax can be tricky, something > > like > > hash-if name:base:delta[,name:base:delta] > > > > where name is the basename of the interface (e.g. vlan) > > so that packets from interface fooX would jump to base+X*delta > > So, this will get performance to approach 120kpps, that will still > need to do a linear search of the rule set to find the next rule, > which I see I have to do anyway. For some reason I thought skipto > used a pointer to the next rule. skipto does use a pointer, and you are right, if one wants a high speed implementation the jump target should be looked up using a hash table as well (perhaps replacing the pointer in the rule itself). > You're thinking somewhere on the lines of: > > skipto base hash-if from to delta [offset ] i did not consider the range in interface numbers, but that's a possibility, yes. On the other hand, i don't think one is going to write 500 different subsets of ipfw rules to handle the 500 different interfaces. another approach that was suggested long ago was to put, in the interface definition, a starting ipfw rule number so the ip_fw_chk() would start from there if available, rather than from rule 1. cheers luigi From owner-freebsd-ipfw@FreeBSD.ORG Fri Aug 4 08:01:37 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org 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 990B716A4DD for ; Fri, 4 Aug 2006 08:01:37 +0000 (UTC) (envelope-from ccwtoeodr@brutele.be) Received: from host-213-189-179-200.brutele.be (host-213-189-179-200.brutele.be [213.189.179.200]) by mx1.FreeBSD.org (Postfix) with ESMTP id BC56F43D62 for ; Fri, 4 Aug 2006 08:00:26 +0000 (GMT) (envelope-from ccwtoeodr@brutele.be) From: "designate period" To: freebsd-ipfw@freebsd.org Date: Fri, 4 Aug 2006 10:00:00 -0200 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0005_01C6B7AC.BFAAAF50" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: Aca3rL+qU+bCj+TFR0ugMd6w14ypyw== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 Message-Id: X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: chosen only X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Aug 2006 08:01:38 -0000 ------=_NextPart_000_0005_01C6B7AC.BFAAAF50 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit VGA Lair pits. heating combined detection aircraft. 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