From patchwork Tue Sep 21 16:14:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leonard Crestez X-Patchwork-Id: 12508281 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA24BC433F5 for ; Tue, 21 Sep 2021 16:19:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D0A9C61107 for ; Tue, 21 Sep 2021 16:19:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234321AbhIUQVR (ORCPT ); Tue, 21 Sep 2021 12:21:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234600AbhIUQU2 (ORCPT ); Tue, 21 Sep 2021 12:20:28 -0400 Received: from mail-ed1-x52f.google.com (mail-ed1-x52f.google.com [IPv6:2a00:1450:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24315C0617A6; Tue, 21 Sep 2021 09:17:37 -0700 (PDT) Received: by mail-ed1-x52f.google.com with SMTP id r5so6713311edi.10; Tue, 21 Sep 2021 09:17:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=xTuLF9iVakUmuqWJrh4h5lRJip3NOmzubsD/v0KQcZA=; b=e0CCTRMaMb+VXQZXecEdK9+PhRe3VtV+vCqsNgTYclTyKxUhRRPNPBCfdTE40toYE4 MtWBgGOvzFhmzaQTXCZesW1lB0PH6umPLwMDX5pKguPrAj6LKSTTtuaTOIhd2be0cT5X O7b2oPQNqlrNioGotBCjRHi7AJlcY6lYn05696BgO/hGtmdC6Dz9QRa8pK7DG/x4rpFK qTlko9ydhAFvv6/DfC/Ksh6KxsT+TuM7t22lv/CXByYdRimlen/bIbvySy4mYFB82oe7 3ulHd3YaaPEppuCmJWOX8s1g45lJqeS+nB2K0kHQXKu59SpGVmj/Y6Vn6c3adUsX31De HxnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xTuLF9iVakUmuqWJrh4h5lRJip3NOmzubsD/v0KQcZA=; b=IkugwuK7oGhVLA5/otOGcphf5qBAhNSOIlLpzQVLtVOWW/VwRryjSgcaGt9qwrTogQ t/ZZc0BIxXyT04BmXcYES9l9YqWXaBqx6z+q8hO7e7RN+TZrvyGeeNJWefbo+/+tbroQ zPcoBAAxTw1EgIehiizZPvT8V8lEB391Yt8wssWeGjC137LNWEYUxYLslsAMdcE21hI3 TK0CekcWGvB3hTLbNodlqKiBtFmrvXbJC1jxwZk0KL5+SAhWADWqGxSD0pnu3J4YNW4M Hr4hGOHa3oDJ4Y6+8yhKZb5loxZ2w1P1Wej+dR+mCcyx8vWRBmFTCF8L1UEqKSP19a6L a0jQ== X-Gm-Message-State: AOAM531gncG6k+cmQUdGq/jJa+WCc9niAhmSNyPN8E72jP2Up7/6Wefz q05ExydJc8o5GG26rDa9OBg= X-Google-Smtp-Source: ABdhPJwJYuiadhExn43H/ihIAbnx+o9isYCWpMew1MkoLwXAA691Zx36NuCbSr00LuDerdAvoJLzKg== X-Received: by 2002:a17:906:1749:: with SMTP id d9mr34603473eje.178.1632240918719; Tue, 21 Sep 2021 09:15:18 -0700 (PDT) Received: from pinky.lan ([2a04:241e:502:1df0:b065:9bdf:4016:277]) by smtp.gmail.com with ESMTPSA id kx17sm7674075ejc.51.2021.09.21.09.15.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Sep 2021 09:15:18 -0700 (PDT) From: Leonard Crestez To: Dmitry Safonov <0x7f454c46@gmail.com>, David Ahern , Shuah Khan Cc: Eric Dumazet , "David S. Miller" , Herbert Xu , Kuniyuki Iwashima , Hideaki YOSHIFUJI , Jakub Kicinski , Yuchung Cheng , Francesco Ruggeri , Mat Martineau , Christoph Paasch , Ivan Delalande , Priyaranjan Jha , Menglong Dong , netdev@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 02/19] docs: Add user documentation for tcp_authopt Date: Tue, 21 Sep 2021 19:14:45 +0300 Message-Id: <1362c88efa09c7710aff0f4516174e4160d3267a.1632240523.git.cdleonard@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The .rst documentation contains a brief description of the user interface and includes kernel-doc generated from uapi header. Signed-off-by: Leonard Crestez --- Documentation/networking/index.rst | 1 + Documentation/networking/tcp_authopt.rst | 44 ++++++++++++++++++++++++ 2 files changed, 45 insertions(+) create mode 100644 Documentation/networking/tcp_authopt.rst diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst index 58bc8cd367c6..f5c324a060d8 100644 --- a/Documentation/networking/index.rst +++ b/Documentation/networking/index.rst @@ -100,10 +100,11 @@ Contents: strparser switchdev sysfs-tagging tc-actions-env-rules tcp-thin + tcp_authopt team timestamping tipc tproxy tuntap diff --git a/Documentation/networking/tcp_authopt.rst b/Documentation/networking/tcp_authopt.rst new file mode 100644 index 000000000000..484f66f41ad5 --- /dev/null +++ b/Documentation/networking/tcp_authopt.rst @@ -0,0 +1,44 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================= +TCP Authentication Option +========================= + +The TCP Authentication option specified by RFC5925 replaces the TCP MD5 +Signature option. It similar in goals but not compatible in either wire formats +or ABI. + +Interface +========= + +Individual keys can be added to or removed from a TCP socket by using +TCP_AUTHOPT_KEY setsockopt and a ``struct tcp_authopt_key``. There is no +support for reading back keys and updates always replace the old key. These +structures represent "Master Key Tuples (MKTs)" as described by the RFC. + +Per-socket options can set or read using the TCP_AUTHOPT sockopt and a ``struct +tcp_authopt``. This is optional: doing setsockopt TCP_AUTHOPT_KEY is +sufficient to enable the feature. + +Configuration associated with TCP Authentication is indepedently attached to +each TCP socket. After listen and accept the newly returned socket gets an +independent copy of relevant settings from the listen socket. + +Key binding +----------- + +Keys can be bound to remote addresses in a way that is similar to TCP_MD5. + + * The full address must match (/32 or /128) + * Ports are ignored + * Address binding is optional, by default keys match all addresses + +RFC5925 requires that key ids do not overlap when tcp identifiers (addr/port) +overlap. This is not enforced by linux, configuring ambiguous keys will result +in packet drops and lost connections. + +ABI Reference +============= + +.. kernel-doc:: include/uapi/linux/tcp.h + :identifiers: tcp_authopt tcp_authopt_flag tcp_authopt_key tcp_authopt_key_flag tcp_authopt_alg