From patchwork Thu Nov 19 19:45:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mat Martineau X-Patchwork-Id: 11918881 X-Patchwork-Delegate: kuba@kernel.org 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=-16.7 required=3.0 tests=BAYES_00, 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 37F6CC56201 for ; Thu, 19 Nov 2020 19:46:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3D4824199 for ; Thu, 19 Nov 2020 19:46:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728015AbgKSTqS (ORCPT ); Thu, 19 Nov 2020 14:46:18 -0500 Received: from mga04.intel.com ([192.55.52.120]:13142 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727066AbgKSTqO (ORCPT ); Thu, 19 Nov 2020 14:46:14 -0500 IronPort-SDR: iCRbN35ISroPzGd0m+dP8U2CBX4gpn+hunIJezatCrhwmiXJiErEjF7/ej1SCY/mseQpG0XbyG PMf9Dz2i0OUg== X-IronPort-AV: E=McAfee;i="6000,8403,9810"; a="168780895" X-IronPort-AV: E=Sophos;i="5.78,354,1599548400"; d="scan'208";a="168780895" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Nov 2020 11:46:09 -0800 IronPort-SDR: 5f+Jm87yNj+gp8grbHBnkYewo/Cri2U8mTSUrI1KIaJAlbXM5F3963D62AFWhsVayu5RGszihG Xg//eLgxdUbg== X-IronPort-AV: E=Sophos;i="5.78,354,1599548400"; d="scan'208";a="476940481" Received: from mjmartin-nuc02.amr.corp.intel.com ([10.255.229.232]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Nov 2020 11:46:09 -0800 From: Mat Martineau To: netdev@vger.kernel.org Cc: Paolo Abeni , kuba@kernel.org, mptcp@lists.01.org, Geliang Tang , Mat Martineau Subject: [PATCH net-next 05/10] mptcp: keep unaccepted MPC subflow into join list Date: Thu, 19 Nov 2020 11:45:58 -0800 Message-Id: <20201119194603.103158-6-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201119194603.103158-1-mathew.j.martineau@linux.intel.com> References: <20201119194603.103158-1-mathew.j.martineau@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Paolo Abeni This will simplify all operation dealing with subflows before accept time (e.g. data fin processing, add_addr). The join list is already flushed by mptcp_stream_accept() before returning the newly created msk to the user space. This also fixes an potential bug present into the old code: conn_list was manipulated without helding the msk lock in mptcp_stream_accept(). Tested-by: Geliang Tang Signed-off-by: Paolo Abeni Signed-off-by: Mat Martineau --- net/mptcp/protocol.c | 24 ++++++++---------------- net/mptcp/protocol.h | 9 +++++++++ net/mptcp/subflow.c | 10 +++++----- 3 files changed, 22 insertions(+), 21 deletions(-) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 806c0658e42f..0e83887efbc8 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -2342,7 +2342,6 @@ static struct sock *mptcp_accept(struct sock *sk, int flags, int *err, if (sk_is_mptcp(newsk)) { struct mptcp_subflow_context *subflow; struct sock *new_mptcp_sock; - struct sock *ssk = newsk; subflow = mptcp_subflow_ctx(newsk); new_mptcp_sock = subflow->conn; @@ -2357,22 +2356,8 @@ static struct sock *mptcp_accept(struct sock *sk, int flags, int *err, /* acquire the 2nd reference for the owning socket */ sock_hold(new_mptcp_sock); - - local_bh_disable(); - bh_lock_sock(new_mptcp_sock); - msk = mptcp_sk(new_mptcp_sock); - msk->first = newsk; - newsk = new_mptcp_sock; - mptcp_copy_inaddrs(newsk, ssk); - list_add(&subflow->node, &msk->conn_list); - sock_hold(ssk); - - mptcp_rcv_space_init(msk, ssk); - bh_unlock_sock(new_mptcp_sock); - - __MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEACK); - local_bh_enable(); + MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEACK); } else { MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK); @@ -2823,6 +2808,12 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock, if (err == 0 && !mptcp_is_tcpsk(newsock->sk)) { struct mptcp_sock *msk = mptcp_sk(newsock->sk); struct mptcp_subflow_context *subflow; + struct sock *newsk = newsock->sk; + bool slowpath; + + slowpath = lock_sock_fast(newsk); + mptcp_copy_inaddrs(newsk, msk->first); + mptcp_rcv_space_init(msk, msk->first); /* set ssk->sk_socket of accept()ed flows to mptcp socket. * This is needed so NOSPACE flag can be set from tcp stack. @@ -2834,6 +2825,7 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock, if (!ssk->sk_socket) mptcp_sock_graft(ssk, newsock); } + unlock_sock_fast(newsk, slowpath); } if (inet_csk_listen_poll(ssock->sk)) diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 10fffc5de9e4..7affaf0b1941 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -403,6 +403,15 @@ mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); } +static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, + struct mptcp_subflow_context *subflow) +{ + sock_hold(mptcp_subflow_tcp_sock(subflow)); + spin_lock_bh(&msk->join_list_lock); + list_add_tail(&subflow->node, &msk->join_list); + spin_unlock_bh(&msk->join_list_lock); +} + int mptcp_is_enabled(struct net *net); unsigned int mptcp_get_add_addr_timeout(struct net *net); void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 794259789194..d3c6b3a5ad55 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -578,6 +578,10 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk, */ inet_sk_state_store((void *)new_msk, TCP_ESTABLISHED); + /* link the newly created socket to the msk */ + mptcp_add_pending_subflow(mptcp_sk(new_msk), ctx); + WRITE_ONCE(mptcp_sk(new_msk)->first, child); + /* new mpc subflow takes ownership of the newly * created mptcp socket */ @@ -1124,11 +1128,7 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, if (err && err != -EINPROGRESS) goto failed; - sock_hold(ssk); - spin_lock_bh(&msk->join_list_lock); - list_add_tail(&subflow->node, &msk->join_list); - spin_unlock_bh(&msk->join_list_lock); - + mptcp_add_pending_subflow(msk, subflow); return err; failed: