From patchwork Wed Dec 2 20:29:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prankur gupta X-Patchwork-Id: 1409948 Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none) header.from=fb.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=fb.com header.i=@fb.com header.a=rsa-sha256 header.s=facebook header.b=XuPUEPxs; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CmVw520rjz9sVJ for ; Thu, 3 Dec 2020 07:30:29 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727388AbgLBUaO (ORCPT ); Wed, 2 Dec 2020 15:30:14 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:21658 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727322AbgLBUaN (ORCPT ); Wed, 2 Dec 2020 15:30:13 -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 0B2KQEDj018586 for ; Wed, 2 Dec 2020 12:29:33 -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=W3GQAXkNMOJjt+UqiahczCK20QLfWZ0GL0Q3KN8ePVg=; b=XuPUEPxsGSFjwSYEWcs/oC08SKxhR77fUFFQ5bw/eG7nr745zuRrtpXDlEuphVmchSUb frIYZ6TZIQX+LAGB8ETdslVrrpFnN6aBjGaMLepWfvTeXALZwHEObNb1KHXXeKinFZsG 36IwGAOu5eqpt6xmRIDfenG3/NzCHMt81q4= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 355wgw7e0b-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 02 Dec 2020 12:29:33 -0800 Received: from intmgw004.08.frc2.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:21d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 2 Dec 2020 12:29:31 -0800 Received: by devvm3178.ftw3.facebook.com (Postfix, from userid 201728) id 43FE94762F194; Wed, 2 Dec 2020 12:29:26 -0800 (PST) From: Prankur gupta To: CC: , Subject: [PATCH v3 bpf-next 1/2] bpf: Adds support for setting window clamp Date: Wed, 2 Dec 2020 12:29:24 -0800 Message-ID: <20201202202925.165803-2-prankgup@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201202202925.165803-1-prankgup@fb.com> References: <20201202202925.165803-1-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=2020-12-02_12:2020-11-30,2020-12-02 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 malwarescore=0 clxscore=1015 impostorscore=0 mlxlogscore=981 bulkscore=0 phishscore=0 adultscore=0 suspectscore=13 priorityscore=1501 mlxscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012020122 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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 --- include/net/tcp.h | 1 + net/core/filter.c | 3 +++ net/ipv4/tcp.c | 23 ++++++++++++++--------- 3 files changed, 18 insertions(+), 9 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 4aba0f069b05..39ced5882fe3 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -406,6 +406,7 @@ void tcp_syn_ack_timeout(const struct request_sock *req); int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, int flags, int *addr_len); int tcp_set_rcvlowat(struct sock *sk, int val); +int tcp_set_window_clamp(struct sock *sk, struct tcp_sock *tp, int val); void tcp_data_ready(struct sock *sk); #ifdef CONFIG_MMU int tcp_mmap(struct file *file, struct socket *sock, diff --git a/net/core/filter.c b/net/core/filter.c index 2ca5eecebacf..d6225842cfb1 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4910,6 +4910,9 @@ 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: + ret = tcp_set_window_clamp(sk, tp, val); + break; default: ret = -EINVAL; } diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index b2bc3d7fe9e8..312feb8fcae5 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3022,6 +3022,19 @@ int tcp_sock_set_keepcnt(struct sock *sk, int val) } EXPORT_SYMBOL(tcp_sock_set_keepcnt); +int tcp_set_window_clamp(struct sock *sk, struct tcp_sock *tp, int val) +{ + if (!val) { + if (sk->sk_state != TCP_CLOSE) + return -EINVAL; + tp->window_clamp = 0; + } else { + tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? + SOCK_MIN_RCVBUF / 2 : val; + } + return 0; +} + /* * Socket option code for TCP. */ @@ -3235,15 +3248,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname, break; case TCP_WINDOW_CLAMP: - if (!val) { - if (sk->sk_state != TCP_CLOSE) { - err = -EINVAL; - break; - } - tp->window_clamp = 0; - } else - tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? - SOCK_MIN_RCVBUF / 2 : val; + err = tcp_set_window_clamp(sk, tp, val); break; case TCP_QUICKACK: