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[144.76.156.219]) by smtp.gmail.com with ESMTPSA id m12-20020a5d4a0c000000b00317e9c05d35sm5834308wrq.85.2023.08.11.08.58.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Aug 2023 08:58:41 -0700 (PDT) From: Matthieu Baerts Date: Fri, 11 Aug 2023 17:57:14 +0200 Subject: [PATCH net-next 01/14] mptcp: avoid unneeded mptcp_token_destroy() calls 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: <20230811-upstream-net-next-20230811-mptcp-get-rid-of-msk-subflow-v1-1-36183269ade8@tessares.net> References: <20230811-upstream-net-next-20230811-mptcp-get-rid-of-msk-subflow-v1-0-36183269ade8@tessares.net> In-Reply-To: <20230811-upstream-net-next-20230811-mptcp-get-rid-of-msk-subflow-v1-0-36183269ade8@tessares.net> To: mptcp@lists.linux.dev, Mat Martineau , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , David Ahern Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Matthieu Baerts X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1720; i=matthieu.baerts@tessares.net; h=from:subject:message-id; bh=gXoRie7DLKf3vWVejVmTZfC//Kg+jCDe1+Txjp6fEyI=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBk1lqv+r3KsHtF8v8Wo26pcmdkgVeFoZMKt2vnr HOE8E3VCBeJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZNZarwAKCRD2t4JPQmmg c5hhD/0c8KK8DF9+DihPAJVsBCw7OJK4Qsqj2v1GgkbmoYkVV/vFyweuzcYBNmZTwHt0Su6nykO yTlwWPLLzZhhIAXBOXbC3XB7d2jkyS3h2pqF/9NcTWo8weFJ8uSMbNlAe7PnjeMAIpzPkJrEK8H 4YkzZK9+ntc2MMMzT73WfsF5iC+FruQYPx/OhwC6yAEVeJ23v5qxEJJojrDZJN+x51fFdQdJNF/ QvsWBAWSLqAXLxy+4Ds9b8q8FMkIXKXIaws85ymRXZ/94L20W9rPdHHljK1Ek1hYlHbD8LJNcxO No80OBKqkrAXLp3LEsaADiPDGyDQSMeaWkRjFZlSj7dybAooRafbK8PZ1Da3GUJsR3Iv8cbj+9O cjhYtxdA6xrGd7MsTFO2pwlVGHp3NCJQyIyqoQFgpjflevMdPrfX/1kA0i/dioxVacgWg8/5uLO 5S0HrjyyGNyngounFXMI4f4Lsouhe0X+DgUcSLMUqyEb+Dpt3XyyIh+nZDOFc9Ivvi1pzkGYovL fLLChmmsbzNCGm4exod+n3UvNvo6upaYtM9NJqaT8A7u8XfsWA9bbICQ2IVtU1htskbe1U0L1Bn Qyhhfb59KB54aTJX647M05snl4oFlidlaSmSjVcMZKw2963aE61PrSJtRdVXw2g/wzH2L6b4HFU 8k5iDsBxKuQShNg== X-Developer-Key: i=matthieu.baerts@tessares.net; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Paolo Abeni The MPTCP protocol currently clears the msk token both at connect() and listen() time. That is needed to deal with failing connect() calls that can create a new token while leaving the sk in TCP_CLOSE,SS_UNCONNECTED status and thus allowing later connect() and/or listen() calls. Let's deal with such failures explicitly, cleaning the token in a timely manner and avoid the confusing early mptcp_token_destroy(). Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts --- net/mptcp/protocol.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 48e649fe2360..abb310548c37 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3594,7 +3594,6 @@ static int mptcp_connect(struct sock *sk, struct sock= addr *uaddr, int addr_len) if (IS_ERR(ssock)) return PTR_ERR(ssock); =20 - mptcp_token_destroy(msk); inet_sk_state_store(sk, TCP_SYN_SENT); subflow =3D mptcp_subflow_ctx(ssock->sk); #ifdef CONFIG_TCP_MD5SIG @@ -3624,6 +3623,8 @@ static int mptcp_connect(struct sock *sk, struct sock= addr *uaddr, int addr_len) * subflow_finish_connect() */ if (unlikely(err && err !=3D -EINPROGRESS)) { + /* avoid leaving a dangling token in an unconnected socket */ + mptcp_token_destroy(msk); inet_sk_state_store(sk, inet_sk_state_load(ssock->sk)); return err; } @@ -3713,7 +3714,6 @@ static int mptcp_listen(struct socket *sock, int back= log) goto unlock; } =20 - mptcp_token_destroy(msk); inet_sk_state_store(sk, TCP_LISTEN); sock_set_flag(sk, SOCK_RCU_FREE); =20 --=20 2.40.1