From owner-freebsd-pf@freebsd.org Tue Oct 13 17:26:39 2020 Return-Path: Delivered-To: freebsd-pf@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 0AF164469C0 for ; Tue, 13 Oct 2020 17:26:39 +0000 (UTC) (envelope-from shuriku@shurik.kiev.ua) Received: from mail.flex-it.com.ua (mail.flex-it.com.ua [193.239.74.7]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4C9jC208gRz3yDK for ; Tue, 13 Oct 2020 17:26:37 +0000 (UTC) (envelope-from shuriku@shurik.kiev.ua) Received: from [91.243.208.110] (helo=thinkpad.flex-it.com.ua) by mail.flex-it.com.ua with esmtpsa (TLS1.3) tls TLS_AES_128_GCM_SHA256 (Exim 4.94 (FreeBSD)) (envelope-from ) id 1kSO4C-000Mb0-Qm; Tue, 13 Oct 2020 20:26:28 +0300 Subject: Re: pf and tap(4) interfaces To: freebsd-pf@freebsd.org References: <20201013160738.GD30207@rpi4.gilescoppice.lan> From: Oleksandr Kryvulia Message-ID: <41851719-8e17-d5d6-4abb-0c4221df70ef@shurik.kiev.ua> Date: Tue, 13 Oct 2020 20:26:23 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1 MIME-Version: 1.0 In-Reply-To: <20201013160738.GD30207@rpi4.gilescoppice.lan> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: ru X-Rspamd-Queue-Id: 4C9jC208gRz3yDK X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of shuriku@shurik.kiev.ua designates 193.239.74.7 as permitted sender) smtp.mailfrom=shuriku@shurik.kiev.ua X-Spamd-Result: default: False [-2.24 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; NEURAL_HAM_LONG(-0.95)[-0.947]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[shurik.kiev.ua]; RECEIVED_SPAMHAUS_PBL(0.00)[91.243.208.110:received]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.14)[-0.143]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_MEDIUM(-0.85)[-0.850]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:35297, ipnet:193.239.72.0/22, country:UA]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-pf]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-pf@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "Technical discussion and general questions about packet filter \(pf\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Oct 2020 17:26:39 -0000 On 13.10.20 19:07, tech-lists wrote: > Hi, > > Is it possible to have a ruleset allowing unfiltered access to a tap > interface, but filtered on the real interface it's bridged to? > > Let's say there are these: > > ext_if="ix0" # real external ip, on a /29 int_if="igb0" # internal ip > 10.0.0.2/8 > tap_if="tap0" # this services a vm on this machine, also with a real ip > > bridge0 has ix0 and tap0 as members > > tap0 needs unfiltered access. it has its own firewall. > ix0 wants to block everything apart from ssh. > > This doesn't work (it blocks everything apart from ssh to the vm as > well): > > [snip] > block all > pass in quick on $ext_if inet proto tcp from any to ($ext_if) port 22 > pass in quick on $tap_if inet proto tcp from any to ($tap_if) > > thanks, External traffic to your tap interface arrives through ix0. So you need to change a third rule: block all pass in quick on $ext_if inet proto tcp from any to ($ext_if) port 22 pass in quick on $ext_if inet proto tcp from any to ($tap_if) Also check net.link.bridge.pfil_member=1 As for me I prefer to have  all IPs and filter it on bridge interface and not on members.