From owner-freebsd-net@freebsd.org Thu Jan 16 14:33:20 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 63D2E1E974A for ; Thu, 16 Jan 2020 14:33:20 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward105p.mail.yandex.net (forward105p.mail.yandex.net [77.88.28.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 47z6B72wR2z44y2; Thu, 16 Jan 2020 14:33:19 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback1g.mail.yandex.net (mxback1g.mail.yandex.net [IPv6:2a02:6b8:0:1472:2741:0:8b7:162]) by forward105p.mail.yandex.net (Yandex) with ESMTP id 261B74D41434; Thu, 16 Jan 2020 17:33:16 +0300 (MSK) Received: from myt3-ecf07668b98a.qloud-c.yandex.net (myt3-ecf07668b98a.qloud-c.yandex.net [2a02:6b8:c12:4f2b:0:640:ecf0:7668]) by mxback1g.mail.yandex.net (mxback/Yandex) with ESMTP id psmhGdeMKv-XFw4O2Ej; Thu, 16 Jan 2020 17:33:16 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1579185196; bh=pK2frvll+QBphXi15F12kHeIf/HifGmS9m8xf0DHWiM=; h=In-Reply-To:From:To:Subject:Cc:Date:References:Message-ID; b=LHOVPO2Zn212mSMlJoro9vuRd11NPeDXycwfM/fk0J+CPxbVRENXg44MUNrzosiya uJ22qLCN1Ijd/yXihfJxaVHCiDRR4Q9NHK5VimK/GeAMN+WJxisdG9dNbwNGPrTg4p 6YjKMhpb7/a4VfiNk731feQhgVoR3OBP2jZi6PJo= Received: by myt3-ecf07668b98a.qloud-c.yandex.net (smtp/Yandex) with ESMTPSA id pccwEhLpfR-XFVih4Zv; Thu, 16 Jan 2020 17:33:15 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) Subject: Re: IPSec transport mode, mtu, fragmentation... To: Eugene Grosbein , Victor Sudakov , freebsd-net@freebsd.org Cc: Michael Tuexen References: <20191220152314.GA55278@admin.sibptus.ru> <4cc83b85-dd30-8c0d-330e-aa549ce98c98@yandex.ru> From: "Andrey V. Elsukov" Openpgp: id=E6591E1B41DA1516F0C9BC0001C5EA0410C8A17A Autocrypt: addr=bu7cher@yandex.ru; prefer-encrypt=mutual; keydata= mQENBEwBF1kBCADB9sXFhBEUy8qQ4X63Y8eBatYMHGEFWN9ypS5lI3RE6qQW2EYbxNk7qUC5 21YIIS1mMFVBEfvR7J9uc7yaYgFCEb6Sce1RSO4ULN2mRKGHP3/Sl0ijZEjWHV91hY1YTHEF ZW/0GYinDf56sYpDDehaBF5wkWIo1+QK5nmj3vl0DIDCMNd7QEiWpyLVwECgLX2eOAXByT8B bCqVhJGcG6iFP7/B9Ll6uX5gb8thM9LM+ibwErDBVDGiOgvfxqidab7fdkh893IBCXa82H9N CNwnEtcgzh+BSKK5BgvPohFMgRwjti37TSxwLu63QejRGbZWSz3OK3jMOoF63tCgn7FvABEB AAG0JUFuZHJleSBWLiBFbHN1a292IDxidTdjaGVyQHlhbmRleC5ydT6JATgEEwECACIFAkwB F1kCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEAHF6gQQyKF6qmYIAI6ekfm1VA4T vqankI1ISE6ku4jV7UlpIQlEbE7/8n3Zd6teJ+pGOQhN5qk8QE7utdPdbktAzi+x7LIJVzUw 4TywZLXGrkP7VKYkfg6oyCGyzITghefQeJtr2TN4hYCkzPWpylkue8MtmqfZv/6royqwTbN+ +E09FQNvTgRUYJYTeQ1qOsxNRycwvw3dr2rOfuxShbzaHBB1pBIjGrMg8fC5pd65ACH5zuFV A0CoTNGMDrEZSfBkTW604UUHFFXeCoC3dwDZRKOWJ3GmMXns65Ai5YkA63BSHEE1Qle3VBhd cG1w0CB5FBV3pB27UVnf0jEbysrDqW4qN7XMRFSWNAy5AQ0ETAEXWQEIAJ2p6l9LBoqdH/0J PEFDY2t2gTvAuzz+8zs3R03dFuHcNbOwjvWCG0aOmVpAzkRa8egn5JB4sZaFUtKPYJEQ1Iu+ LUBwgvtXf4vWpzC67zs2dDuiW4LamH5p6xkTD61aHR7mCB3bg2TUjrDWn2Jt44cvoYxj3dz4 S49U1rc9ZPgD5axCNv45j72tggWlZvpefThP7xT1OlNTUqye2gAwQravXpZkl5JG4eOqJVIU X316iE3qso0iXRUtO7OseBf0PiVmk+wCahdreHOeOxK5jMhYkPKVn7z1sZiB7W2H2TojbmcK HZC22sz7Z/H36Lhg1+/RCnGzdEcjGc8oFHXHCxUAEQEAAYkBHwQYAQIACQUCTAEXWQIbDAAK CRABxeoEEMihegkYCAC3ivGYNe2taNm/4Nx5GPdzuaAJGKWksV+w9mo7dQvU+NmI2az5w8vw 98OmX7G0OV9snxMW+6cyNqBrVFTu33VVNzz9pnqNCHxGvj5dL5ltP160JV2zw2bUwJBYsgYQ WfyJJIM7l3gv5ZS3DGqaGIm9gOK1ANxfrR5PgPzvI9VxDhlr2juEVMZYAqPLEJe+SSxbwLoz BcFCNdDAyXcaAzXsx/E02YWm1hIWNRxanAe7Vlg7OL+gvLpdtrYCMg28PNqKNyrQ87LQ49O9 50IIZDOtNFeR0FGucjcLPdS9PiEqCoH7/waJxWp6ydJ+g4OYRBYNM0EmMgy1N85JJrV1mi5i Message-ID: Date: Thu, 16 Jan 2020 17:30:59 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="wByn78GEMizZ8jVshN98zBqvkVx2Rrdp6" X-Rspamd-Queue-Id: 47z6B72wR2z44y2 X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=yandex.ru header.s=mail header.b=LHOVPO2Z; dmarc=pass (policy=none) header.from=yandex.ru; spf=pass (mx1.freebsd.org: domain of bu7cher@yandex.ru designates 77.88.28.108 as permitted sender) smtp.mailfrom=bu7cher@yandex.ru X-Spamd-Result: default: False [-5.20 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:77.88.0.0/18]; FREEMAIL_FROM(0.00)[yandex.ru]; HAS_ATTACHMENT(0.00)[]; RCVD_COUNT_THREE(0.00)[4]; DKIM_TRACE(0.00)[yandex.ru:+]; DMARC_POLICY_ALLOW(-0.50)[yandex.ru,none]; SIGNED_PGP(-2.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:+,3:~]; RCVD_TLS_LAST(0.00)[]; RCVD_IN_DNSWL_LOW(-0.10)[108.28.88.77.list.dnswl.org : 127.0.5.1]; ASN(0.00)[asn:13238, ipnet:77.88.0.0/18, country:RU]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[yandex.ru.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[yandex.ru]; R_DKIM_ALLOW(-0.20)[yandex.ru:s=mail]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.20)[multipart/signed,multipart/mixed,text/plain]; IP_SCORE(0.00)[ip: (-9.75), ipnet: 77.88.0.0/18(-4.80), asn: 13238(-3.81), country: RU(0.01)]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(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: Thu, 16 Jan 2020 14:33:20 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --wByn78GEMizZ8jVshN98zBqvkVx2Rrdp6 Content-Type: multipart/mixed; boundary="5xIqNMgNJ6JapmsPLLedZFI5yWBwH6Otj"; protected-headers="v1" From: "Andrey V. Elsukov" To: Eugene Grosbein , Victor Sudakov , freebsd-net@freebsd.org Cc: Michael Tuexen Message-ID: Subject: Re: IPSec transport mode, mtu, fragmentation... References: <20191220152314.GA55278@admin.sibptus.ru> <4cc83b85-dd30-8c0d-330e-aa549ce98c98@yandex.ru> In-Reply-To: --5xIqNMgNJ6JapmsPLLedZFI5yWBwH6Otj Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 16.01.2020 17:24, Eugene Grosbein wrote: > 16.01.2020 20:39, Andrey V. Elsukov wrote: >=20 >> I prepared the PoC patch that should fix the problem with TCP and >> transport mode IPsec. But I have not free time currently to properly >> test and debug it. It is only compile-tested. But If you want, you can= >> try :) >> Currently only IPv4 support is implemented. >> >> https://people.freebsd.org/~ae/ipsec_transport_mode_ctlinput.diff >=20 > In fact, I've faced this problem long time ago too and I work around it= with different approaches > like "ipfw tcp-setmss" (MSS adjust) or by using IPSec transport mode > with gif(4) interface removing DF bit out of encapsulated packets. >=20 > I was going to test your patch with my home router but the patch does n= ot apply to stable/11, at all. > Do you have time to adjust it to stable/11 ? I tried apply the patch with `svn patch` and it applies cleanly. The only needed change is moving `#include ipsec_support.h` to the top of file. --=20 WBR, Andrey V. 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