From patchwork Wed Dec 8 11:37:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leonard Crestez X-Patchwork-Id: 522312 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FBE4C43217 for ; Wed, 8 Dec 2021 11:38:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232702AbhLHLlr (ORCPT ); Wed, 8 Dec 2021 06:41:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229747AbhLHLlh (ORCPT ); Wed, 8 Dec 2021 06:41:37 -0500 Received: from mail-ed1-x52a.google.com (mail-ed1-x52a.google.com [IPv6:2a00:1450:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6CDE0C0698D1; Wed, 8 Dec 2021 03:38:02 -0800 (PST) Received: by mail-ed1-x52a.google.com with SMTP id g14so7307822edb.8; Wed, 08 Dec 2021 03:38:02 -0800 (PST) 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=KIfVSl/0ggPg/bXLh4ZZRzQW73Rnp7fzeTUKk1TxyW1y9EsIgRoAsUIT+zNW1n/M5P Fb9RG5geL+Xuc0RDNCmvEOkdfwILkpGW+jC9+jTY3ma7zq8EtrlLtb9o/4aKGBbUPCnK 2uTiPYsZ2OHoOM0cXRpd2gPqPysdcZFiFSZGbI60mC2xSyjna2PZQnA3Mpppe5L4JCB0 a2TqrJFMz8fbIqlu6E2smxpjlC7KHMPlIisFodAD8SSKqR5lYbJ9G1hKqfH50KvSVr83 XaBJHs2xcNxyAl/Mlt+dkyhnC0fDI1HQltku6chU+dwGNHDtpGh8K3iwoVq+MiWZ3X/j IKqA== 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=jO8qqoF4VOe6qn4t249g31YFPr+2NiPADOENegOUQFx6jV8sKCfZ4SkL0yHQjK6Wyg egQ1Ef5pRlgELEp8RzFZ8gw2V15hy/ZEqGUOw0FxNYnw7XSlrJOUAIfPbwTvof3Xwve/ XCbGtKoegNYqU4h2p/cUK5lHn5Zzdi/YJz8/7QTNeBTbW0KWipTZ4S2AI4TsONUhkKGe c71sGjJeOyfZdACztTiK4f4jvJYqgsYOTIpTU76pYLUjXDKj9Gs52WOjIFtXuavW2dAi wzBL+c4cbeBeWT2bpJepwfOK7DlnYknmgpG72mY6wDbRm3vo6+tcRdw/9mKt56kZz+8r vcYg== X-Gm-Message-State: AOAM531fIBVoAOXrSkJsGkbSY5S+a9ajXM9dTasiJltY5sO88zArN5sa Nrv1x8TCrDqi9SiG+DJOl3I= X-Google-Smtp-Source: ABdhPJyhRgpHRFpduR3FDN2QSQ40EB4LNJfuphjQc+fRsVQhe4ljyVhRXsXKcnOkuhcGjTX7cqMjMQ== X-Received: by 2002:a17:907:3d88:: with SMTP id he8mr6750259ejc.565.1638963480952; Wed, 08 Dec 2021 03:38:00 -0800 (PST) Received: from ponky.lan ([2a04:241e:501:3870:3c9f:e05b:4dff:43ba]) by smtp.gmail.com with ESMTPSA id g11sm1883810edz.53.2021.12.08.03.37.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Dec 2021 03:38:00 -0800 (PST) From: Leonard Crestez To: David Ahern , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Dumazet Cc: Francesco Ruggeri , Shuah Khan , "David S. Miller" , Herbert Xu , Kuniyuki Iwashima , Hideaki YOSHIFUJI , Jakub Kicinski , Yuchung Cheng , Mat Martineau , Christoph Paasch , Ivan Delalande , Priyaranjan Jha , netdev@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 02/18] docs: Add user documentation for tcp_authopt Date: Wed, 8 Dec 2021 13:37:17 +0200 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@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