From owner-freebsd-net@freebsd.org Sun Nov 22 19:20:52 2020 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 B642F471E51 for ; Sun, 22 Nov 2020 19:20:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4CfKrN4cFZz3sQ1 for ; Sun, 22 Nov 2020 19:20:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 9E3D0471D57; Sun, 22 Nov 2020 19:20:52 +0000 (UTC) Delivered-To: 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 9E07A471E50 for ; Sun, 22 Nov 2020 19:20:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (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-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4CfKrN41p1z3sKD for ; Sun, 22 Nov 2020 19:20:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (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 mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 7D80B1F343 for ; Sun, 22 Nov 2020 19:20:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 0AMJKqe5079265 for ; Sun, 22 Nov 2020 19:20:52 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 0AMJKq3m079264 for net@FreeBSD.org; Sun, 22 Nov 2020 19:20:52 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 248172] OpenVPN configuring tun/tap devices ends up with IFDISABLED interfaces (problem with all ifnet, especially cloned ones) Date: Sun, 22 Nov 2020 19:20:51 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 12.1-RELEASE X-Bugzilla-Keywords: needs-qa, regression X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: gert@greenie.muc.de X-Bugzilla-Status: In Progress X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: kevans@freebsd.org X-Bugzilla-Flags: maintainer-feedback? mfc-stable12? X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Nov 2020 19:20:52 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248172 --- Comment #23 from Gert Doering --- (In reply to Bjoern A. Zeeb from comment #22) Bjoern, thanks for looking into this. I have stared at the diff, and it looks like a reasonable approach that sol= ves both the "if people do not want IPv6, they should not get it" requirement, = and the "but if an interface is created under program control, and the program configures IPv6, there should not be a race with a RC script that turns IPv6 back off". I have applied the patch to a 12.2-RELEASE system (kernel + /etc/rc.subr) a= nd can confirm that it works. As in: -- it compiles :-) -- if I bring up an interface manually ("ifconfig tun7 create up"), the interface has the desired (as in: keep existing behaviour) property of "nd6 options=3D29" -- if I bring up the interface from within OpenVPN (open /dev/tun, exec "ifconfig ... inet6 ...", removing the "sleep(1); ifconfig ... -ifdisabled" workaround) the resulting interface has IPv6, and does not have "IFDISABLED= ".=20 Since this was a race condition before - sometimes it worked, sometimes it failed - I've ran the particular test a few dozen times, with no single fai= lure case. And no more "nd6_dad_timer: cancel DAD on tun0 because of ND6_IFF_IFDISABLED." in dmesg either :-) So, for me, this patch is the right answer :-) gert --=20 You are receiving this mail because: You are on the CC list for the bug.=