From owner-freebsd-net@freebsd.org Sat Aug 24 20:11:24 2019 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 3D109C9ADA for ; Sat, 24 Aug 2019 20:11:24 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:c2c:26d8::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 46G8Y72qw1z46L8 for ; Sat, 24 Aug 2019 20:11:22 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13:0:0:0:5]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id x7OKBJVs012955 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 24 Aug 2019 20:11:20 GMT (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: vit@otcnet.ru Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id x7OKBFSM051514 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Sun, 25 Aug 2019 03:11:16 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: finding optimal ipfw strategy To: Victor Gamov , freebsd-net@freebsd.org References: <4ff39c8f-341c-5d72-1b26-6558c57bff8d@grosbein.net> From: Eugene Grosbein Message-ID: <7ca629bd-065b-549a-37f4-cd41d18f83e3@grosbein.net> Date: Sun, 25 Aug 2019 03:11:08 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <4ff39c8f-341c-5d72-1b26-6558c57bff8d@grosbein.net> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,LOCAL_FROM, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.2 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record * -0.0 SPF_PASS SPF: sender matches SPF record * 2.6 LOCAL_FROM From my domains X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net X-Rspamd-Queue-Id: 46G8Y72qw1z46L8 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=permerror (mx1.freebsd.org: domain of eugen@grosbein.net uses mechanism not recognized by this client) smtp.mailfrom=eugen@grosbein.net X-Spamd-Result: default: False [-4.38 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[grosbein.net]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; R_SPF_PERMFAIL(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_SHORT(-0.98)[-0.977,0]; IP_SCORE(-1.30)[ip: (-2.70), ipnet: 2a01:4f8::/29(-1.96), asn: 24940(-1.85), country: DE(-0.01)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/29, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Aug 2019 20:11:24 -0000 25.08.2019 2:34, Eugene Grosbein wrote: > Also, use table arguments and not only table values, do not ignore their existence: > > ipfw table $Mcast1_iface_out add vlan20 $mcast11 > ipfw table $Mcast1_iface_out add vlan20 $mcast12 > ipfw table $Mcast1_iface_out add vlan20 $mcast13 > ipfw add 25000 allow udp from IP1 to tablearg out xmit "table($Mcast1_iface_out)" > > Note there is one single checking ipfw rules for all used pairs ($Mcast1_iface_out, $mcastXX) > and this time it is not micro-optimization but very important one when you have plenty of mcastXX. I have to correct myself: ipfw table cannot contain multiple values differing with arguments only, so we should rewrite commands this way: first table contains just list of used multicast destination IPs: Mcast_addr_out=1 ipfw table $Mcast_addr_out create type addr ipfw table $Mcast_addr_out add $mcast11 25012 # use range of rules 25012-49999 ipfw table $Mcast_addr_out add $mcast12 25014 # increment rule number by 2 ipfw table $Mcast_addr_out add $mcast13 25016 And you have multiple tables for list of interfaces, one table per multicast destination: Mcast1_iface_out=2 ipfw table $Mcast1_iface_out create type iface ipfw table $Mcast1_iface_out add vlan20 ipfw table $Mcast1_iface_out add vlan22 ipfw table $Mcast1_iface_out add vlan39 Then you start filtering by splitting traffic by destination IP that is most efficient: ipfw add 25000 skipto tablearg from $IP1 to "table($Mcast_addr_out)" ipfw add 25010 deny udp from $your_multicast_range to any ipfw add 25011 skipto 50000 ip from any to any # past this set of checks Only traffic destined for specific IP hits the rule checking for outgoing interface: ipfw add 25012 allow udp from any to any out xmit "table($Mcast1_iface_out)" ipfw add 25013 deny udp from any to any ipfw add 25014 allow udp from any to any out xmit "table($Mcast2_iface_out)" ipfw add 25015 deny udp from any to any And so on.