From owner-freebsd-net@freebsd.org Mon Sep 24 20:26:35 2018 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 30089108E9E9 for ; Mon, 24 Sep 2018 20:26:35 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward100o.mail.yandex.net (forward100o.mail.yandex.net [37.140.190.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "forwards.mail.yandex.net", Issuer "Yandex CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 9DB2E7162B; Mon, 24 Sep 2018 20:26:34 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback9j.mail.yandex.net (mxback9j.mail.yandex.net [IPv6:2a02:6b8:0:1619::112]) by forward100o.mail.yandex.net (Yandex) with ESMTP id 0B89C2A2266C; Mon, 24 Sep 2018 23:26:26 +0300 (MSK) Received: from smtp4p.mail.yandex.net (smtp4p.mail.yandex.net [2a02:6b8:0:1402::15:6]) by mxback9j.mail.yandex.net (nwsmtp/Yandex) with ESMTP id ZP4epa8IWj-QPreuxUP; Mon, 24 Sep 2018 23:26:25 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1537820786; bh=1C2y+1jggMYHDaxX355xAv8OGPjO7fDlQCYNOIqVLLY=; h=Subject:To:References:Cc:From:Message-ID:Date:In-Reply-To; b=oNlWFIGIMYbgwnmHobQCnSLMzl2NSw5q3pImtTpUa28sto3xu+7pV/B0RagQT+ox6 4p2t/S9J62Oka3UznnDXCIRPrTEnpj2oNh15Y4gB2wvJUKFQukNY5msJexnisd2jrF 2G7Xi8qNNvKaXJvrUZwmv/dHJ8Ri/TOjOkQPmhKI= Received: by smtp4p.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id 9lCVrDmxnX-QPiC2qX5; Mon, 24 Sep 2018 23:26:25 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1537820785; bh=1C2y+1jggMYHDaxX355xAv8OGPjO7fDlQCYNOIqVLLY=; h=Subject:To:References:Cc:From:Message-ID:Date:In-Reply-To; b=FPZQcz+Nb6ON8rKkm3KeuvztnKzvlLmEpa50w4oy1CENjQ8L4W8bJVwzrZLF02VEG XgyO3WP9jslw3fZbmSSr5wsUTV0qBqN0f0F3bRJOfN2EAVV9yJWfBwunPI1SJmbPIT siaK3TudVh1eKyoxSr0QQEz9C3/NnpvOKVBL2uYU= Authentication-Results: smtp4p.mail.yandex.net; dkim=pass header.i=@yandex.ru Subject: Re: IPv6 fragment reassembly regression following FreeBSD-SA-18:10.ip To: "John W. O'Brien" , FreeBSD Net References: <38a2d322-eae9-ec3d-284c-af29aed10c03@saltant.com> Cc: Xin LI , Kristof Provost From: "Andrey V. Elsukov" Openpgp: id=E6591E1B41DA1516F0C9BC0001C5EA0410C8A17A Autocrypt: addr=bu7cher@yandex.ru; prefer-encrypt=mutual; keydata= xsBNBEwBF1kBCADB9sXFhBEUy8qQ4X63Y8eBatYMHGEFWN9ypS5lI3RE6qQW2EYbxNk7qUC5 21YIIS1mMFVBEfvR7J9uc7yaYgFCEb6Sce1RSO4ULN2mRKGHP3/Sl0ijZEjWHV91hY1YTHEF ZW/0GYinDf56sYpDDehaBF5wkWIo1+QK5nmj3vl0DIDCMNd7QEiWpyLVwECgLX2eOAXByT8B bCqVhJGcG6iFP7/B9Ll6uX5gb8thM9LM+ibwErDBVDGiOgvfxqidab7fdkh893IBCXa82H9N CNwnEtcgzh+BSKK5BgvPohFMgRwjti37TSxwLu63QejRGbZWSz3OK3jMOoF63tCgn7FvABEB AAHNIkFuZHJleSBWLiBFbHN1a292IDxhZUBmcmVlYnNkLm9yZz7CwHsEEwECACUCGwMGCwkI BwMCBhUIAgkKCwQWAgMBAh4BAheABQJMB/ruAhkBAAoJEAHF6gQQyKF6MLwH/3Ri/TZl9uo0 SepYWXOnxL6EaDVXDA+dLb1eLKC4PRBBjX29ttQ0KaWapiE6y5/AfzOPmRtHLrHYHjd/aiHX GMLHcYRXD+5GvdkK8iMALrZ28X0JXyuuZa8rAxWIWmCbYHNSBy2unqWgTI04Erodk90IALgM 9JeHN9sFqTM6zalrMnTzlcmel4kcjT3lyYw3vOKgoYLtsLhKZSbJoVVVlvRlGBpHFJI5AoYJ SyfXoN0rcX6k9X7Isp2K50YjqxV4v78xluh1puhwZyC0p8IShPrmrp9Oy9JkMX90o6UAXdGU KfdExJuGJfUZOFBTtNIMNIAKfMTjhpRhxONIr0emxxDOwE0ETAEXWQEIAJ2p6l9LBoqdH/0J PEFDY2t2gTvAuzz+8zs3R03dFuHcNbOwjvWCG0aOmVpAzkRa8egn5JB4sZaFUtKPYJEQ1Iu+ LUBwgvtXf4vWpzC67zs2dDuiW4LamH5p6xkTD61aHR7mCB3bg2TUjrDWn2Jt44cvoYxj3dz4 S49U1rc9ZPgD5axCNv45j72tggWlZvpefThP7xT1OlNTUqye2gAwQravXpZkl5JG4eOqJVIU X316iE3qso0iXRUtO7OseBf0PiVmk+wCahdreHOeOxK5jMhYkPKVn7z1sZiB7W2H2TojbmcK HZC22sz7Z/H36Lhg1+/RCnGzdEcjGc8oFHXHCxUAEQEAAcLAXwQYAQIACQUCTAEXWQIbDAAK CRABxeoEEMihegkYCAC3ivGYNe2taNm/4Nx5GPdzuaAJGKWksV+w9mo7dQvU+NmI2az5w8vw 98OmX7G0OV9snxMW+6cyNqBrVFTu33VVNzz9pnqNCHxGvj5dL5ltP160JV2zw2bUwJBYsgYQ WfyJJIM7l3gv5ZS3DGqaGIm9gOK1ANxfrR5PgPzvI9VxDhlr2juEVMZYAqPLEJe+SSxbwLoz BcFCNdDAyXcaAzXsx/E02YWm1hIWNRxanAe7Vlg7OL+gvLpdtrYCMg28PNqKNyrQ87LQ49O9 50IIZDOtNFeR0FGucjcLPdS9PiEqCoH7/waJxWp6ydJ+g4OYRBYNM0EmMgy1N85JJrV1mi5i Message-ID: Date: Mon, 24 Sep 2018 23:24:53 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <38a2d322-eae9-ec3d-284c-af29aed10c03@saltant.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="5giEUYRIsfJDyYdsPmznPzCUyh4JR9xc9" X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Sep 2018 20:26:35 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --5giEUYRIsfJDyYdsPmznPzCUyh4JR9xc9 Content-Type: multipart/mixed; boundary="lwDs4zUOTGzmx8wEfmz02BpKlf1I9ja0X"; protected-headers="v1" From: "Andrey V. Elsukov" To: "John W. O'Brien" , FreeBSD Net Cc: Xin LI , Kristof Provost Message-ID: Subject: Re: IPv6 fragment reassembly regression following FreeBSD-SA-18:10.ip References: <38a2d322-eae9-ec3d-284c-af29aed10c03@saltant.com> In-Reply-To: <38a2d322-eae9-ec3d-284c-af29aed10c03@saltant.com> --lwDs4zUOTGzmx8wEfmz02BpKlf1I9ja0X Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 23.09.2018 16:43, John W. O'Brien wrote: > I'd like to check my understanding and then ask a procedural question. >=20 > FreeBSD-SA-18:10.ip [0], released on 08/14, was resolved by r337828 [1]= =2E > That changeset, resulting in 11.1R-p13 and 11.2R-p2, included a patch t= o > the way IPv6 fragment reassembly is handled [2] that was part of the > merge to releng. In an ensuing thread [3] two weeks later, an > implementation defect was identified, but not before that defect had > shipped. The defect is now being tracked as a bug [4], as of 09/03 has > been fixed in head and stable/11, and is registered as a blocker for 12= =2E0. >=20 > I believe this defect is the cause of a problem I detected recently > where postfix would query BIND on ::1 for the DNSSEC-signed AAAA of an > MX, and never receive a response. I'm a little puzzled that lo0 is > affected in spite of having a 16k MTU, but the other signs are there: > the symptoms appeared after upgrading from 11.2R-p1 to -p3, and I can > perform that query successfully on UDPv4 or TCPv6. >=20 > What I have been unable so far to determine is, will another 11.2R patc= h > be forthcoming to resolve this regression, and if so, when? I can limp > along without UDPv6 for a little while, but not until 11.3. The only > clear alternative is to downgrade to -p1. >=20 > [0] https://www.freebsd.org/security/advisories/FreeBSD-SA-18:10.ip.asc= > [1] https://svnweb.freebsd.org/changeset/base/337828 > [2] https://svnweb.freebsd.org/changeset/base/337776 > [3] https://lists.freebsd.org/pipermail/svn-src-head/2018-August/117514= =2Ehtml > [4] https://bugs.freebsd.org/231045 Your analysis looks correct to me. r338406 was not merged to releng/11.2.= --=20 WBR, Andrey V. Elsukov --lwDs4zUOTGzmx8wEfmz02BpKlf1I9ja0X-- --5giEUYRIsfJDyYdsPmznPzCUyh4JR9xc9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAlupSBUACgkQAcXqBBDI oXr0vwf/T2sFwS0SzFvxButAjV/fvsROasVUg4tipNo3tnnERHqthDOi5008we0i FcTJHZ+k8hzmdDyo0mz1LbllMcim/TiUyOexbn8/+ME3XAuEMzq92q4gbDty4d+T K0Zthl64axwe7phLF2jMcAgU9HYOuqsEVpv5WlvEQk5c8tZPWTfFr5SUt4ETjMMR QPW8+UyHVhVlOXtXpyoPQL8c2Kmy8NTJFX28OjSPelHqsBZRmnhQzOJ7WYbiYNiE SPISQaDhMnUyCgAe5mw7yCGtjRLjNoi1pVFbiLJooRQyCiZz7OAnc4BrTZjsiuFt x5ygVErrcE+BnF3uTINlUJiVjIIRGg== =oI2P -----END PGP SIGNATURE----- --5giEUYRIsfJDyYdsPmznPzCUyh4JR9xc9--