From owner-freebsd-transport@freebsd.org Thu Dec 5 19:58:31 2019 Return-Path: Delivered-To: freebsd-transport@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 2BC811AA823 for ; Thu, 5 Dec 2019 19:58:31 +0000 (UTC) (envelope-from jgh@wizmail.org) Received: from wizmail.org (wizmail.org [IPv6:2a00:1940:107::2:0:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "smtp.wizmail.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 47TRNj5pgBz4bHY for ; Thu, 5 Dec 2019 19:58:29 +0000 (UTC) (envelope-from jgh@wizmail.org) ARC-Seal: i=1; cv=none; a=rsa-sha256; d=wizmail.org; s=r201803; t=1575575909; b=UrlDFVn+BQRNpFnLKWAHuSE+Vy2dJcFRgoWquDZghokrYi7577PwFDaOsdQCw1eQtWt5qlVmBt fM1TRTeg0+H2MKFBXUxIva6BNWQlEU0XWb5tYIFXlcqQqYXw9X0teztVKR9Obz5FXqT8TFn1h1 16vh0jOlSdVw9DL1KWWVL8k=; ARC-Authentication-Results: i=1; wizmail.org; 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bh=iJZ4NUMwxccthmNKpV10w7UFkY7FoDAZgFE8IWaaVRo=; b=e TkC5dVCALufO679hP3FPKhyCE8H6rxCaJ0suSoOwTiM83tXSXVgSYLTwASxj4Sn6DN/DzUAe5kF2W 3GqsgkzR2kDm1Yllk3vCTaY/5GzEUnUT8CXd4emLZOiS7F4Jpvj/W8OlCZimjW9l1iSP+9vuOzcWY 08EGnNNkAbQOzmvg=; Received: from vgate18.wizint.net ([2a00:1940:107::1:2f:0] helo=lap.dom.ain) by wizmail.org (Exim 4.92.134) (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 with esmtpsa id 1icxGe-0004FF-2G for freebsd-transport@freebsd.org (return-path ); Thu, 05 Dec 2019 19:58:28 +0000 Subject: Re: TCP Fast Open To: freebsd-transport@freebsd.org References: <5276cc23-d37f-e55e-11c5-030314e9e32c@wizmail.org> <1206B1BE-3B7E-45D0-8C2B-6012A5CB6298@freebsd.org> <2752006b-cd6b-7b8b-d23b-ae2c794dc104@wizmail.org> From: Jeremy Harris Autocrypt: addr=jgh@wizmail.org; prefer-encrypt=mutual; keydata= mQENBFWABsQBCADTFfb9EHGGiDel/iFzU0ag1RuoHfL/09z1y7iQlLynOAQTRRNwCWezmqpD p6zDFOf1Ldp0EdEQtUXva5g2lm3o56o+mnXrEQr11uZIcsfGIck7yV/y/17I7ApgXMPg/mcj ifOTM9C7+Ptghf3jUhj4ErYMFQLelBGEZZifnnAoHLOEAH70DENCI08PfYRRG6lZDB09nPW7 vVG8RbRUWjQyxQUWwXuq4gQohSFDqF4NE8zDHE/DgPJ/yFy+wFr2ab90DsE7vOYb42y95keK tTBp98/Y7/2xbzi8EYrXC+291dwZELMHnYLF5sO/fDcrDdwrde2cbZ+wtpJwtSYPNvVxABEB AAG0JkplcmVteSBIYXJyaXMgKG5vbmUpIDxqZ2hAd2l6bWFpbC5vcmc+iQE7BBMBAgAlAhsD BgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAUCVYAYBAIZAQAKCRC85YyM5B8y34iFB/9wozIY RogNdY1aejFFixb6++y4b1riyjMvWEULeEzDlQ0lMT6Z3PxXhZILD4y4aP7Kzx0ozXa5qaKy 41EAPKQoPipnRAH04QytJbIERvz8Tot/LeCVKUc0G9DVxOPBD03czTgqgz4EjV2qvnLF+rTU 0YBevrNCluKosGSd+3RvLWVu0hBhn9pELKfXJNSQXZb+TpHDhSDZ/gCrglBEOhA6YWbDb/4g z+5TFKdk+B++iAQZSHv7zISabjN+BPYgI47A+MU4JycoXaAUnMc0l5ba6fGNaIrzruE4aAZr lP5o+7mlU9Mm0QJqdqYxYPAiplJGrZv+YXH1fp5ueEK3l+NGuQENBFWABsQBCADphLHaKToR uR/E7THerBiCjDatwCaETOKOTY2zRBQpaQ32p/F2XIGLS8Cc27+grZSKQ6ZX0ZN47O+AFyFH F8DH90IXZFpJR3Rb8zgXT8jnLX08DM31eECZHnRzFhGlOmq6WAUlqB3GKCPUCY2c4eTRXyoX LteTxrXCYoj45y/YmvlZrlonBNjPBAyHiO/LNz+V7fZtNsN7N/XGrnLbcdNfNd+SD1ENmbLJ 8RvyymxguTyB/ka9JdjHHIoQEJ6L166B3hhfCHpt8iC0GPZkti9IMl0NoJ029jJm3Jq1qEce EBn5H5QMGn6Fq64iXwTsO1TMNUwpWx8pjvV7wVIxjI8ZABEBAAGJAR8EGAECAAkFAlWABsQC GwwACgkQvOWMjOQfMt9N6Af8CS2CTrMQFdhkGEtBXmL4ifD8UHFkBRBGmM8ZL2fWUBTZXT8m rdRMOK6tcPnKWaCvWvKr0knt970j/DyAgFmH8hgOi3yctigFecVDjjilAeCJMq38s1tYKYiL DbBdHWtdkA9uHZwq3lfd3QxcEEO3QamQF+dO7h8gAOXlG+po87Hm+E0wz4swIB8+S37Jzrx9 uu0LSFDfJCTK+TIKGa5Un8LxPxyq9WnnNDh72zK7BiRidk/s40KcNod83NM4Hn/sbGfyLa8s S0F3ME0S+ocSMOiu/ZHHOiwpLYNbwTJ7stZxGsrguWeT9P+amxbA/YlK95LedstwvN+WcHZ7 d++Arg== Message-ID: Date: Thu, 5 Dec 2019 19:58:27 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Pcms-Received-Sender: vgate18.wizint.net ([2a00:1940:107::1:2f:0] helo=lap.dom.ain) with esmtpsa X-Rspamd-Queue-Id: 47TRNj5pgBz4bHY X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=wizmail.org header.s=r201803 header.b=e TkC5dV; dmarc=none; spf=none (mx1.freebsd.org: domain of jgh@wizmail.org has no SPF policy when checking 2a00:1940:107::2:0:0) smtp.mailfrom=jgh@wizmail.org X-Spamd-Result: default: False [-3.31 / 15.00]; IP_SCORE(-0.02)[country: GB(-0.08)]; NEURAL_HAM_MEDIUM(-1.00)[-0.995,0]; R_DKIM_ALLOW(-0.20)[wizmail.org:s=r201803]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-0.999,0]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[wizmail.org]; RCPT_COUNT_ONE(0.00)[1]; DKIM_TRACE(0.00)[wizmail.org:+]; R_SPF_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:16353, ipnet:2a00:1940::/32, country:GB]; ARC_ALLOW(-1.00)[i=1]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Dec 2019 19:58:31 -0000 On 05/12/2019 19:43, Michael Tuexen wrote: > Are you asking how to figure out whether TFO was used or not? > In that case you can use > getsockopt(fd, IPPROTO_TCP, TCP_FASTOPEN, &on, &len); > If on == 0, TFO was not used, on != 0, TFO was used. I'd found that, but it's so far unclear what choices it makes among - didn't try TFO - tried TFO but the server didn't take it up - server accepted the TFO cookie, but not the data that was on the SYN - server acked the data -- Cheers, Jeremy