From patchwork Thu Sep 10 00:50:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Wang X-Patchwork-Id: 261207 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=-12.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 341EDC43461 for ; Thu, 10 Sep 2020 02:43:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E641721941 for ; Thu, 10 Sep 2020 02:43:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="pEQVX3It" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730585AbgIJCnY (ORCPT ); Wed, 9 Sep 2020 22:43:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730586AbgIJCHb (ORCPT ); Wed, 9 Sep 2020 22:07:31 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EBF82C06136E for ; Wed, 9 Sep 2020 17:51:16 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 129so3870933ybn.15 for ; Wed, 09 Sep 2020 17:51:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=0DDsdUWkpeGDlcHTYL2blsH30ZZYfjjkwjdpdSOQiWE=; b=pEQVX3ItJxKCy4UrNyuy9fLtZ/MG7JnfGF3GluEGit5zgeFNmo5xJB8URMpZ96tXoj JFRnNWCfoZ5EG196lVv2nlcTpc6yRNjIJfxukD8ug7vj/jBtAu3HMYMsbSsIVPnVfNpL D2fuKJJecpIUnPNgqKvM6N546Dmyi8QYm6NEg2gTF3Sqh8xRz7TcVGK2+bsA4Sc0caam EIFMDCvma/yeqfSAQN0XOGmac51MQ2uJCUCaqoJxCovbtBuvLZazL1/9CgH08vzsdhQ7 D6PgEbp+uHyZWr2jMMebu/T3FOnduB51MWYrNEOhcgSrpKJB+ZXtgwHRCBW6cmSI6LOv lmbQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=0DDsdUWkpeGDlcHTYL2blsH30ZZYfjjkwjdpdSOQiWE=; b=emz7Rt50NdBX1skpSguhBLMA4y7dqb79n0RS2cSEe7WFxwA2PO0IipGMnyblB4hzqU 3SuH7GiS5w3RaxxNrOrpmk/F/7SSnVCQ1qFkWXAtBwx+2sWVqIV7g8ObTtqHtS2lVAxp iQf8yY7nOlEIsoPG6HjjtM+6kLMqjROkQdILKKpA/+vFndzlXDFyZex4ociSpmu1ev9/ /10FdFwS4CuDPBVyzit3JSW2z/kPmzFF4g0v4TJS+cQwD+4Lb45hPUeAYg/kuUFtOBOj mkFamndZ5OQavuY8opvP7HNEs2xSQ/73tR+FQO7w7K7xvSGw9QlZDw/z6Ha63/Y5BkOY GMFQ== X-Gm-Message-State: AOAM533w1F26HZRYhDNQAktqoznU9rBXvibf+VtPhDi9agopXuzAkKs0 7yNMp8pN5Bgxy0t8EYkNUUk7RxxTN3A= X-Google-Smtp-Source: ABdhPJywf8cWiEGTGUb0JRzwKaKhYD98mJzCMnMwLnzN3e4AtMbFlWAZEX8hsUvsSm0mmgtdLHL3MrJ8D5E= X-Received: from weiwan.svl.corp.google.com ([2620:15c:2c4:201:1ea0:b8ff:fe75:cf08]) (user=weiwan job=sendgmr) by 2002:a25:bcd2:: with SMTP id l18mr8919782ybm.290.1599699076196; Wed, 09 Sep 2020 17:51:16 -0700 (PDT) Date: Wed, 9 Sep 2020 17:50:46 -0700 In-Reply-To: <20200910005048.4146399-1-weiwan@google.com> Message-Id: <20200910005048.4146399-2-weiwan@google.com> Mime-Version: 1.0 References: <20200910005048.4146399-1-weiwan@google.com> X-Mailer: git-send-email 2.28.0.618.gf4bc123cb7-goog Subject: [PATCH net-next 1/3] tcp: record received TOS value in the request socket From: Wei Wang To: "David S . Miller" , netdev@vger.kernel.org Cc: Eric Dumazet , Wei Wang Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org A new field is added to the request sock to record the TOS value received on the listening socket during 3WHS: When not under syn flood, it is recording the TOS value sent in SYN. When under syn flood, it is recording the TOS value sent in the ACK. This is a preparation patch in order to do TOS reflection in the later commit. Signed-off-by: Wei Wang Signed-off-by: Eric Dumazet --- include/linux/tcp.h | 1 + net/ipv4/syncookies.c | 6 +++--- net/ipv4/tcp_input.c | 1 + 3 files changed, 5 insertions(+), 3 deletions(-) diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 56ff2952edaf..2f87377e9af7 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -134,6 +134,7 @@ struct tcp_request_sock { * FastOpen it's the seq# * after data-in-SYN. */ + u8 syn_tos; }; static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index f0794f0232ba..c375c126f436 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -286,11 +286,10 @@ struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk, struct sk_buff *skb) { + struct tcp_request_sock *treq; struct request_sock *req; #ifdef CONFIG_MPTCP - struct tcp_request_sock *treq; - if (sk_is_mptcp(sk)) ops = &mptcp_subflow_request_sock_ops; #endif @@ -299,8 +298,9 @@ struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops, if (!req) return NULL; -#if IS_ENABLED(CONFIG_MPTCP) treq = tcp_rsk(req); + treq->syn_tos = TCP_SKB_CB(skb)->ip_dsfield; +#if IS_ENABLED(CONFIG_MPTCP) treq->is_mptcp = sk_is_mptcp(sk); if (treq->is_mptcp) { int err = mptcp_subflow_init_cookie_req(req, sk, skb); diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 4337841faeff..3658ad84f0c6 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -6834,6 +6834,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops, tcp_rsk(req)->snt_isn = isn; tcp_rsk(req)->txhash = net_tx_rndhash(); + tcp_rsk(req)->syn_tos = TCP_SKB_CB(skb)->ip_dsfield; tcp_openreq_init_rwin(req, sk, dst); sk_rx_queue_set(req_to_sk(req), skb); if (!want_cookie) {