From nobody Mon Sep 16 19:37:39 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 7FECD13EFF7; Fri, 2 Feb 2024 11:40:20 +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=1706874020; cv=none; b=ubjq9rNsoybodQq/IXmzCtZrLFJcQbN5tOE8T+TSaDOctK98L3ujBy2ZVtwSPhLG+k6vE0p389FFmi797P/myQFZJYEID7vsQu8LJ1APQSRTDW0QRQL9xq7k/nc62DkEje6R1SNrlJxttBpjL3ATlVElHIMWXAIdSsGcZXSib5c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706874020; c=relaxed/simple; bh=5yc+86w3yyKe04H5iWLy/uFSmTiMA2lqTHZoCkfPUCU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=N994CICy0d3e3TbHE438XoUTwV0KkCohpGSeG4ivX5ueyi+W+sozp7yN4H9674OCK+g3mttShyD/sEkLmCxLK/nBKfCekh7KXcBbw/S1GJU+l3sMtit8NFJcYpg6pGwSLHboaGKJJd2HgcJaO+L0y8Wz6+lJ/KAMtBeHBxJIXfM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oKBHgSzg; 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="oKBHgSzg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5922C43390; Fri, 2 Feb 2024 11:40:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706874020; bh=5yc+86w3yyKe04H5iWLy/uFSmTiMA2lqTHZoCkfPUCU=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=oKBHgSzgToOEaPb7eGUdUc89q9lOc3ljyY4AmNcHzLGpkghl/p3DZyThZ0VBdclyg y6Towp76lYE7rY6yb8JmF0n9cwYQlIAlDRHT6lUAtQ8sbZSzJlNENqy2SP/eGvI1gH UDq87w1cCevNlVI4ibvzQUT7rgW+2nJamNlvBJwGnFg6olaKRf7TIRkq5s/5NBVRVC dFhD65oy6cZVusDR+NKPj39+y2gYBRtRcFB4zp67+vEbPIhk9cDQS/z+4GKxE9C6fP 6sUeDVjMig67fVvbhlmRtK+6cwoNPm9V7mVpFCoeIFzNX9WR+ShS7b9WgcrgdJMZhr ql6/2lVJ1h+AA== From: "Matthieu Baerts (NGI0)" Date: Fri, 02 Feb 2024 12:40:07 +0100 Subject: [PATCH net-next 1/5] mptcp: annotate access for msk keys Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240202-upstream-net-next-20240202-mptcp-annotate-lockless-access-v1-1-031d6680afdc@kernel.org> References: <20240202-upstream-net-next-20240202-mptcp-annotate-lockless-access-v1-0-031d6680afdc@kernel.org> In-Reply-To: <20240202-upstream-net-next-20240202-mptcp-annotate-lockless-access-v1-0-031d6680afdc@kernel.org> To: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Matthieu Baerts (NGI0)" X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=4822; i=matttbe@kernel.org; h=from:subject:message-id; bh=96HWwfDzSrjT/wYUKZiVvF6RaRUdJdTbmitFuA8YVr4=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBlvNSeT6koPoNWOPabIN9mKiAw/EcaIERSBZoZ/ /nhmOYhhz2JAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZbzUngAKCRD2t4JPQmmg czaKEADS+YXwH4jzDmGv2L3+5H/uS0oZWbZ8jjEHdWwXxUenyXHbDGBJ550y/EgvdfNIjSt82Eg /NinqEmTQNm32OMumcQ2ZnzUnr7o3n6sZd3iHsc+YUp5dYNskjVOLeo7xdIr6juDed4gTowIacC NaJjZRSeU1bByIm7gar9Gded4/m567WLtHsnq7S7RaDFy3gYVOWpcVstq7aOQtdKB3TibnjHhoQ EFWKbxsztiuQeLPOsKtH7o0U8OcFcpQvwbpDOXgdYRdDQBIudaHAawmFpuMiE9IO5H2GU1x4YPE J7AuPDcQUBdHLOtG7czM3gykGLhaFkb89MaU4+9UzDp3z1Y+UCnhbvMAxk1JB08+SURWnhrhYt7 qjFVkIHZvi4rhFPZQblkS9bBs/E6Pa8gW6Yu2RFYCE13G6rz4+RK4zgTtfkjtysA6nKOqJ9b488 ECTZi7YyManvuzRzSNfVqh6iXAIHMEt6YrsnLv8ncH3VJIFLidlaXKzKnAkJOW9WA3/a1VNjxaS zhPRztHSPDf+hdz/Wtl18NGCXot4Fps5NG50s6v5uLimfWKFFZ4gD8DF1AG+nlqIjTywsucXyim uxGaesC5g+n+9Dx5kmw8/ix9FhBaOz8G4wLwsCJxOSn9Kdfb1uIBcIAzu3RVhNbYBF/1VcE74/o ylz59Htow+Ix3eA== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Paolo Abeni Both the local and the remote key follow the same locking schema, put in place the proper ONCE accessors. Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) --- net/mptcp/options.c | 12 ++++++------ net/mptcp/protocol.c | 2 +- net/mptcp/protocol.h | 6 ++++-- net/mptcp/subflow.c | 10 ++++++---- 4 files changed, 17 insertions(+), 13 deletions(-) diff --git a/net/mptcp/options.c b/net/mptcp/options.c index d2527d189a79..5e2b130d8680 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -689,8 +689,8 @@ static bool mptcp_established_options_add_addr(struct s= ock *sk, struct sk_buff * opts->suboptions |=3D OPTION_MPTCP_ADD_ADDR; if (!echo) { MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDRTX); - opts->ahmac =3D add_addr_generate_hmac(msk->local_key, - msk->remote_key, + opts->ahmac =3D add_addr_generate_hmac(READ_ONCE(msk->local_key), + READ_ONCE(msk->remote_key), &opts->addr); } else { MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADDTX); @@ -792,7 +792,7 @@ static bool mptcp_established_options_fastclose(struct = sock *sk, =20 *size =3D TCPOLEN_MPTCP_FASTCLOSE; opts->suboptions |=3D OPTION_MPTCP_FASTCLOSE; - opts->rcvr_key =3D msk->remote_key; + opts->rcvr_key =3D READ_ONCE(msk->remote_key); =20 pr_debug("FASTCLOSE key=3D%llu", opts->rcvr_key); MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFASTCLOSETX); @@ -1099,8 +1099,8 @@ static bool add_addr_hmac_valid(struct mptcp_sock *ms= k, if (mp_opt->echo) return true; =20 - hmac =3D add_addr_generate_hmac(msk->remote_key, - msk->local_key, + hmac =3D add_addr_generate_hmac(READ_ONCE(msk->remote_key), + READ_ONCE(msk->local_key), &mp_opt->addr); =20 pr_debug("msk=3D%p, ahmac=3D%llu, mp_opt->ahmac=3D%llu\n", @@ -1147,7 +1147,7 @@ bool mptcp_incoming_options(struct sock *sk, struct s= k_buff *skb) =20 if (unlikely(mp_opt.suboptions !=3D OPTION_MPTCP_DSS)) { if ((mp_opt.suboptions & OPTION_MPTCP_FASTCLOSE) && - msk->local_key =3D=3D mp_opt.rcvr_key) { + READ_ONCE(msk->local_key) =3D=3D mp_opt.rcvr_key) { WRITE_ONCE(msk->rcv_fastclose, true); mptcp_schedule_work((struct sock *)msk); MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFASTCLOSERX); diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 028e8b473626..874f019c5093 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3193,7 +3193,7 @@ struct sock *mptcp_sk_clone_init(const struct sock *s= k, __mptcp_init_sock(nsk); =20 msk =3D mptcp_sk(nsk); - msk->local_key =3D subflow_req->local_key; + WRITE_ONCE(msk->local_key, subflow_req->local_key); msk->token =3D subflow_req->token; msk->in_accept_queue =3D 1; WRITE_ONCE(msk->fully_established, false); diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 3517f2d24a22..13b8cf8ec704 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -260,8 +260,10 @@ struct mptcp_data_frag { struct mptcp_sock { /* inet_connection_sock must be the first member */ struct inet_connection_sock sk; - u64 local_key; - u64 remote_key; + u64 local_key; /* protected by the first subflow socket lock + * lockless access read + */ + u64 remote_key; /* same as above */ u64 write_seq; u64 bytes_sent; u64 snd_nxt; diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 0dcb721c89d1..d60b83511302 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -75,7 +75,8 @@ static void subflow_req_create_thmac(struct mptcp_subflow= _request_sock *subflow_ =20 get_random_bytes(&subflow_req->local_nonce, sizeof(u32)); =20 - subflow_generate_hmac(msk->local_key, msk->remote_key, + subflow_generate_hmac(READ_ONCE(msk->local_key), + READ_ONCE(msk->remote_key), subflow_req->local_nonce, subflow_req->remote_nonce, hmac); =20 @@ -694,7 +695,8 @@ static bool subflow_hmac_valid(const struct request_soc= k *req, if (!msk) return false; =20 - subflow_generate_hmac(msk->remote_key, msk->local_key, + subflow_generate_hmac(READ_ONCE(msk->remote_key), + READ_ONCE(msk->local_key), subflow_req->remote_nonce, subflow_req->local_nonce, hmac); =20 @@ -1530,8 +1532,8 @@ int __mptcp_subflow_connect(struct sock *sk, const st= ruct mptcp_addr_info *loc, mptcp_pm_get_flags_and_ifindex_by_id(msk, local_id, &flags, &ifindex); subflow->remote_key_valid =3D 1; - subflow->remote_key =3D msk->remote_key; - subflow->local_key =3D msk->local_key; + subflow->remote_key =3D READ_ONCE(msk->remote_key); + subflow->local_key =3D READ_ONCE(msk->local_key); subflow->token =3D msk->token; mptcp_info2sockaddr(loc, &addr, ssk->sk_family); =20 --=20 2.43.0