From patchwork Tue Dec 1 16:43:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prankur gupta X-Patchwork-Id: 11943243 X-Patchwork-Delegate: bpf@iogearbox.net 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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 8F4B1C71156 for ; Tue, 1 Dec 2020 16:44:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F563208C3 for ; Tue, 1 Dec 2020 16:44:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="o+zKoJFP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728107AbgLAQol (ORCPT ); Tue, 1 Dec 2020 11:44:41 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:64790 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725885AbgLAQok (ORCPT ); Tue, 1 Dec 2020 11:44:40 -0500 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0B1GLwot024118 for ; Tue, 1 Dec 2020 08:44:00 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=+vg20QsxrHjWRyiB4huPhOw6IpTsigJrXdHgbBxUf9M=; b=o+zKoJFPi2NP5qJzoNBsQs4Ne74Y1riZOzXP+zEWbNIERbBGGJDef065U3b+C/H4x9Ue moRSFuE1g/YHg0XiVNVBODNHF7neucO5shb0G5oWijT+tmIVQA2iG1KXvlMUARNpOEIO nE551CLAxJntKuDbkXaQXOnRYvO8fBg/Iv0= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 354hsykek4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 01 Dec 2020 08:44:00 -0800 Received: from intmgw004.08.frc2.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::d) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Tue, 1 Dec 2020 08:43:58 -0800 Received: by devvm3178.ftw3.facebook.com (Postfix, from userid 201728) id 0EC914757EBAF; Tue, 1 Dec 2020 08:43:58 -0800 (PST) From: Prankur gupta To: CC: , Subject: [PATCH bpf-next 1/2] bpf: Adds support for setting window clamp Date: Tue, 1 Dec 2020 08:43:56 -0800 Message-ID: <20201201164357.2623610-2-prankgup@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201201164357.2623610-1-prankgup@fb.com> References: <20201201164357.2623610-1-prankgup@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-12-01_07:2020-11-30,2020-12-01 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 clxscore=1015 adultscore=0 priorityscore=1501 impostorscore=0 mlxscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 suspectscore=13 mlxlogscore=654 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012010102 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Adds a new bpf_setsockopt for TCP sockets, TCP_BPF_WINDOW_CLAMP, which sets the maximum receiver window size. It will be useful for limiting receiver window based on RTT. Signed-off-by: Prankur gupta --- net/core/filter.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/net/core/filter.c b/net/core/filter.c index 2ca5eecebacf..8c52ffae7b0c 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4910,6 +4910,19 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname, tp->notsent_lowat = val; sk->sk_write_space(sk); break; + case TCP_WINDOW_CLAMP: + if (!val) { + if (sk->sk_state != TCP_CLOSE) { + ret = -EINVAL; + break; + } + tp->window_clamp = 0; + } else { + tp->window_clamp = + val < SOCK_MIN_RCVBUF / 2 ? + SOCK_MIN_RCVBUF / 2 : val; + } + break; default: ret = -EINVAL; }