From nobody Sat Nov 23 10:28:44 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 02FAC20823B; Wed, 6 Nov 2024 18:49:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730918996; cv=none; b=ITZaSXFP/+tzAA2t/EHKIIn2/BZoyC/sI6d2TqZPv6y1N5LginORogzZ+zQjtl0P2ksD6l0Pm7p7j6X8PBMw4MUzVqZg9fNjn7ZhfzI5B7pC30pwf1Mz2H5mpSv8xLnUya0wieCsmVNky5FLj+/jhXr3Z0DnfuYe0mDQI1meZcI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730918996; c=relaxed/simple; bh=x3OuOVXeYNMZ5J8mdlOMHUyUU2o5xCEWuMjEXd6ZnWo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=pSgK2hjjo7HplqYCnyK3UZfouDymDCpwa3/3qIePudAxZES/NTTnESHrCrDQ2CfSmT2mWEHHTFCoomFhhjQYGZNSCJtP5syc0v/t+cCW4DHXNqVenjjOT0LIlkp97OwyuUJ+9SnyY+UY9b3ZB+4cds+RDYQCwz2zrmLZGfAWCpY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FwxUIK2y; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FwxUIK2y" Received: by smtp.kernel.org (Postfix) with ESMTPS id 9A7DAC4CED9; Wed, 6 Nov 2024 18:49:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730918995; bh=x3OuOVXeYNMZ5J8mdlOMHUyUU2o5xCEWuMjEXd6ZnWo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=FwxUIK2yGkiiEL1/AssTbOdkgDQ0MycZyp4Fw+NVfsxrjIWGaPeoj2J14lwVScdmb ryRpdHvQohFrcjV1zZKFwFKHE4yg2ya3gmrNFm4d01onoZFQVr/jt2GJBRY+CYJn7Q wK8w14uzsiOB+yjtekLonDl++r5PLS/SyLPy4EBX2kZlRDIp5Hgi+1RTINTz343Xc+ 2j18oT3R0HzBm3gByshemSeG2VZl3Vt4AZmXXyrbvDOVb9UUha20Uc4fu8guf8GAGD ZfCDPswMp7bCVY6YMgIY2SMJnOZLJmgdheM5fmfdbt+LvLqlicmaolRCgyyl52yoYG f3xlNuxccf1QQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9085DD59F60; Wed, 6 Nov 2024 18:49:55 +0000 (UTC) From: Dmitry Safonov via B4 Relay Date: Wed, 06 Nov 2024 18:10:17 +0000 Subject: [PATCH net 4/6] net/diag: Always pre-allocate tcp_ulp info Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241106-tcp-md5-diag-prep-v1-4-d62debf3dded@gmail.com> References: <20241106-tcp-md5-diag-prep-v1-0-d62debf3dded@gmail.com> In-Reply-To: <20241106-tcp-md5-diag-prep-v1-0-d62debf3dded@gmail.com> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , David Ahern , Ivan Delalande , Matthieu Baerts , Mat Martineau , Geliang Tang , Boris Pismenny , John Fastabend Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, mptcp@lists.linux.dev, Dmitry Safonov <0x7f454c46@gmail.com> X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1730918993; l=6868; i=0x7f454c46@gmail.com; s=20240410; h=from:subject:message-id; bh=FncH4oZGHPV39oeGv/CSy8io/OgtTSiJCBLPRkjA1HU=; b=g5fDzb3sXLqQkmiILRw2wIeXsPHRbv9pl2o1FAODv7/R2cKEKtTaeulkQdFRC6H1J0eo3NWzZ w6fmt7kcGjJBGgN4ED3rKvsYJQ9vFjVlvQuavd8SqNYBMhKpV2Kfub6 X-Developer-Key: i=0x7f454c46@gmail.com; a=ed25519; pk=cFSWovqtkx0HrT5O9jFCEC/Cef4DY8a2FPeqP4THeZQ= X-Endpoint-Received: by B4 Relay for 0x7f454c46@gmail.com/20240410 with auth_id=152 X-Original-From: Dmitry Safonov <0x7f454c46@gmail.com> Reply-To: 0x7f454c46@gmail.com From: Dmitry Safonov <0x7f454c46@gmail.com> Currently there is a theoretical race between netlink one-socket dump and allocating icsk->icsk_ulp_ops. Simplify the expectations by always allocating maximum tcp_ulp-info. With the previous patch the typical netlink message allocation was decreased for kernel replies on requests without idiag_ext flags, so let's use it. Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com> --- include/net/tcp.h | 1 - net/ipv4/inet_diag.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ net/ipv4/tcp_diag.c | 13 ------------- net/mptcp/diag.c | 20 -------------------- net/tls/tls_main.c | 17 ----------------- 5 files changed, 48 insertions(+), 51 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index d1948d357dade0842777265d3397842919f9eee0..757711aa5337ae7e6abee62d303= eb66d37082e19 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2568,7 +2568,6 @@ struct tcp_ulp_ops { void (*release)(struct sock *sk); /* diagnostic */ int (*get_info)(struct sock *sk, struct sk_buff *skb); - size_t (*get_info_size)(const struct sock *sk); /* clone ulp */ void (*clone)(const struct request_sock *req, struct sock *newsk, const gfp_t priority); diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index 2dd173a73bd1e2657957e5e4ecb70401cc85dfda..97862971d552216e574cac3dd2a= 8fc8c893888d3 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -97,6 +97,53 @@ void inet_diag_msg_common_fill(struct inet_diag_msg *r, = struct sock *sk) } EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); =20 +static size_t tls_get_info_size(void) +{ + size_t size =3D 0; + +#ifdef CONFIG_TLS + size +=3D nla_total_size(0) + /* INET_ULP_INFO_TLS */ + nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */ + nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */ + nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */ + nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */ + nla_total_size(0) + /* TLS_INFO_ZC_RO_TX */ + nla_total_size(0) + /* TLS_INFO_RX_NO_PAD */ + 0; +#endif + + return size; +} + +static size_t subflow_get_info_size(void) +{ + size_t size =3D 0; + +#ifdef CONFIG_MPTCP + size +=3D nla_total_size(0) + /* INET_ULP_INFO_MPTCP */ + nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_REM */ + nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_LOC */ + nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_RELWRITE_SEQ */ + nla_total_size_64bit(8) + /* MPTCP_SUBFLOW_ATTR_MAP_SEQ */ + nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_MAP_SFSEQ */ + nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_SSN_OFFSET */ + nla_total_size(2) + /* MPTCP_SUBFLOW_ATTR_MAP_DATALEN */ + nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_FLAGS */ + nla_total_size(1) + /* MPTCP_SUBFLOW_ATTR_ID_REM */ + nla_total_size(1) + /* MPTCP_SUBFLOW_ATTR_ID_LOC */ + 0; +#endif + + return size; +} + +static size_t tcp_ulp_ops_size(void) +{ + size_t size =3D max(tls_get_info_size(), subflow_get_info_size()); + + return size + nla_total_size(0) + nla_total_size(TCP_ULP_NAME_MAX); +} + static size_t inet_sk_attr_size(struct sock *sk, const struct inet_diag_req_v2 *req, bool net_admin) @@ -115,6 +162,7 @@ static size_t inet_sk_attr_size(struct sock *sk, ret +=3D nla_total_size(sizeof(struct tcp_info)) + nla_total_size(sizeof(struct inet_diag_msg)) + inet_diag_msg_attrs_size() + + tcp_ulp_ops_size() + 64; =20 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c index 36606a19b451f059e32c58c0d76a878dc9be5ff0..722dbfd54d247b4def1e77b1674= c5b207c5a939d 100644 --- a/net/ipv4/tcp_diag.c +++ b/net/ipv4/tcp_diag.c @@ -154,7 +154,6 @@ static int tcp_diag_get_aux(struct sock *sk, bool net_a= dmin, =20 static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin) { - struct inet_connection_sock *icsk =3D inet_csk(sk); size_t size =3D 0; =20 #ifdef CONFIG_TCP_MD5SIG @@ -174,18 +173,6 @@ static size_t tcp_diag_get_aux_size(struct sock *sk, b= ool net_admin) sizeof(struct tcp_diag_md5sig)); } #endif - - if (net_admin && sk_fullsock(sk)) { - const struct tcp_ulp_ops *ulp_ops; - - ulp_ops =3D icsk->icsk_ulp_ops; - if (ulp_ops) { - size +=3D nla_total_size(0) + - nla_total_size(TCP_ULP_NAME_MAX); - if (ulp_ops->get_info_size) - size +=3D ulp_ops->get_info_size(sk); - } - } return size; } =20 diff --git a/net/mptcp/diag.c b/net/mptcp/diag.c index 2d3efb405437d85c0bca70d7a92ca3a7363365e1..8b36867e4ddd5f45cebcf60e909= 3a061d5208756 100644 --- a/net/mptcp/diag.c +++ b/net/mptcp/diag.c @@ -84,27 +84,7 @@ static int subflow_get_info(struct sock *sk, struct sk_b= uff *skb) return err; } =20 -static size_t subflow_get_info_size(const struct sock *sk) -{ - size_t size =3D 0; - - size +=3D nla_total_size(0) + /* INET_ULP_INFO_MPTCP */ - nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_REM */ - nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_LOC */ - nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_RELWRITE_SEQ */ - nla_total_size_64bit(8) + /* MPTCP_SUBFLOW_ATTR_MAP_SEQ */ - nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_MAP_SFSEQ */ - nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_SSN_OFFSET */ - nla_total_size(2) + /* MPTCP_SUBFLOW_ATTR_MAP_DATALEN */ - nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_FLAGS */ - nla_total_size(1) + /* MPTCP_SUBFLOW_ATTR_ID_REM */ - nla_total_size(1) + /* MPTCP_SUBFLOW_ATTR_ID_LOC */ - 0; - return size; -} - void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops) { ops->get_info =3D subflow_get_info; - ops->get_info_size =3D subflow_get_info_size; } diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c index 6b4b9f2749a6fd6de495940c5cb3f2154a5a451e..f3491c4e942e08dc882cb81eef0= 71203384b2b37 100644 --- a/net/tls/tls_main.c +++ b/net/tls/tls_main.c @@ -1072,22 +1072,6 @@ static int tls_get_info(struct sock *sk, struct sk_b= uff *skb) return err; } =20 -static size_t tls_get_info_size(const struct sock *sk) -{ - size_t size =3D 0; - - size +=3D nla_total_size(0) + /* INET_ULP_INFO_TLS */ - nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */ - nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */ - nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */ - nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */ - nla_total_size(0) + /* TLS_INFO_ZC_RO_TX */ - nla_total_size(0) + /* TLS_INFO_RX_NO_PAD */ - 0; - - return size; -} - static int __net_init tls_init_net(struct net *net) { int err; @@ -1123,7 +1107,6 @@ static struct tcp_ulp_ops tcp_tls_ulp_ops __read_most= ly =3D { .init =3D tls_init, .update =3D tls_update, .get_info =3D tls_get_info, - .get_info_size =3D tls_get_info_size, }; =20 static int __init tls_register(void) --=20 2.42.2