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AJvYcCX2mR2Tw+4htguCejF1PdhRI0uwXpLzxWbA3oXsOOO+UP+FKA6fLI77qHZNWlAe6AxvlrB2PceJG8I34E5MVDb84+VNbX6TRUwsTd44vmE2q9bIghK2eUKtKSBKl67vuoJq3R5qTcjuo0OJ X-Gm-Message-State: AOJu0YztWEj4So4IaNAwBC+zU9KpTOITkDTohJgQslfokoXYg1vrcJnR HWVQH6ewAs4jl1pg+Ez49dPGPr57cWiOkU8UQlO1DPL64ADyHn38KJXsMDyN X-Google-Smtp-Source: AGHT+IEWvJViSoVS0wr9rr1/aeg8rz7tLGFqWHjwyTo05J3Py8YBVZ0LEjHJtmkaauTpWtMGe+8o0g== X-Received: by 2002:a05:6a21:788c:b0:1a7:39a8:6ca4 with SMTP id bf12-20020a056a21788c00b001a739a86ca4mr5096219pzc.29.1714014833849; Wed, 24 Apr 2024 20:13:53 -0700 (PDT) Received: from KERNELXING-MB0.tencent.com ([43.132.141.24]) by smtp.gmail.com with ESMTPSA id gm8-20020a056a00640800b006e740d23674sm12588884pfb.140.2024.04.24.20.13.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Apr 2024 20:13:53 -0700 (PDT) From: Jason Xing To: edumazet@google.com, dsahern@kernel.org, matttbe@kernel.org, martineau@kernel.org, geliang@kernel.org, kuba@kernel.org, pabeni@redhat.com, davem@davemloft.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, atenart@kernel.org, horms@kernel.org Cc: mptcp@lists.linux.dev, netdev@vger.kernel.org, linux-trace-kernel@vger.kernel.org, kerneljasonxing@gmail.com, Jason Xing Subject: [PATCH net-next v9 1/7] net: introduce rstreason to detect why the RST is sent Date: Thu, 25 Apr 2024 11:13:34 +0800 Message-Id: <20240425031340.46946-2-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20240425031340.46946-1-kerneljasonxing@gmail.com> References: <20240425031340.46946-1-kerneljasonxing@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Jason Xing Add a new standalone file for the easy future extension to support both active reset and passive reset in the TCP/DCCP/MPTCP protocols. This patch only does the preparations for reset reason mechanism, nothing else changes. The reset reasons are divided into three parts: 1) reuse drop reasons for passive reset in TCP 2) our own independent reasons which aren't relying on other reasons at all 3) reuse MP_TCPRST option for MPTCP The benefits of a standalone reset reason are listed here: 1) it can cover more than one case, such as reset reasons in MPTCP, active reset reasons. 2) people can easily/fastly understand and maintain this mechanism. 3) we get unified format of output with prefix stripped. 4) more new reset reasons are on the way ... I will implement the basic codes of active/passive reset reason in those three protocols, which are not complete for this moment. For passive reset part in TCP, I only introduce the NO_SOCKET common case which could be set as an example. After this series applied, it will have the ability to open a new gate to let other people contribute more reasons into it :) Signed-off-by: Jason Xing Acked-by: Matthieu Baerts (NGI0) Reviewed-by: Eric Dumazet --- include/net/rstreason.h | 106 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 include/net/rstreason.h diff --git a/include/net/rstreason.h b/include/net/rstreason.h new file mode 100644 index 000000000000..bc53b5a24505 --- /dev/null +++ b/include/net/rstreason.h @@ -0,0 +1,106 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef _LINUX_RSTREASON_H +#define _LINUX_RSTREASON_H +#include +#include + +#define DEFINE_RST_REASON(FN, FNe) \ + FN(NOT_SPECIFIED) \ + FN(NO_SOCKET) \ + FN(MPTCP_RST_EUNSPEC) \ + FN(MPTCP_RST_EMPTCP) \ + FN(MPTCP_RST_ERESOURCE) \ + FN(MPTCP_RST_EPROHIBIT) \ + FN(MPTCP_RST_EWQ2BIG) \ + FN(MPTCP_RST_EBADPERF) \ + FN(MPTCP_RST_EMIDDLEBOX) \ + FN(ERROR) \ + FNe(MAX) + +/** + * enum sk_rst_reason - the reasons of socket reset + * + * The reasons of sk reset, which are used in DCCP/TCP/MPTCP protocols. + * + * There are three parts in order: + * 1) skb drop reasons: relying on drop reasons for such as passive reset + * 2) independent reset reasons: such as active reset reasons + * 3) reset reasons in MPTCP: only for MPTCP use + */ +enum sk_rst_reason { + /* Refer to include/net/dropreason-core.h + * Rely on skb drop reasons because it indicates exactly why RST + * could happen. + */ + /** @SK_RST_REASON_NOT_SPECIFIED: reset reason is not specified */ + SK_RST_REASON_NOT_SPECIFIED, + /** @SK_RST_REASON_NO_SOCKET: no valid socket that can be used */ + SK_RST_REASON_NO_SOCKET, + + /* Copy from include/uapi/linux/mptcp.h. + * These reset fields will not be changed since they adhere to + * RFC 8684. So do not touch them. I'm going to list each definition + * of them respectively. + */ + /** + * @SK_RST_REASON_MPTCP_RST_EUNSPEC: Unspecified error. + * This is the default error; it implies that the subflow is no + * longer available. The presence of this option shows that the + * RST was generated by an MPTCP-aware device. + */ + SK_RST_REASON_MPTCP_RST_EUNSPEC, + /** + * @SK_RST_REASON_MPTCP_RST_EMPTCP: MPTCP-specific error. + * An error has been detected in the processing of MPTCP options. + * This is the usual reason code to return in the cases where a RST + * is being sent to close a subflow because of an invalid response. + */ + SK_RST_REASON_MPTCP_RST_EMPTCP, + /** + * @SK_RST_REASON_MPTCP_RST_ERESOURCE: Lack of resources. + * This code indicates that the sending host does not have enough + * resources to support the terminated subflow. + */ + SK_RST_REASON_MPTCP_RST_ERESOURCE, + /** + * @SK_RST_REASON_MPTCP_RST_EPROHIBIT: Administratively prohibited. + * This code indicates that the requested subflow is prohibited by + * the policies of the sending host. + */ + SK_RST_REASON_MPTCP_RST_EPROHIBIT, + /** + * @SK_RST_REASON_MPTCP_RST_EWQ2BIG: Too much outstanding data. + * This code indicates that there is an excessive amount of data + * that needs to be transmitted over the terminated subflow while + * having already been acknowledged over one or more other subflows. + * This may occur if a path has been unavailable for a short period + * and it is more efficient to reset and start again than it is to + * retransmit the queued data. + */ + SK_RST_REASON_MPTCP_RST_EWQ2BIG, + /** + * @SK_RST_REASON_MPTCP_RST_EBADPERF: Unacceptable performance. + * This code indicates that the performance of this subflow was + * too low compared to the other subflows of this Multipath TCP + * connection. + */ + SK_RST_REASON_MPTCP_RST_EBADPERF, + /** + * @SK_RST_REASON_MPTCP_RST_EMIDDLEBOX: Middlebox interference. + * Middlebox interference has been detected over this subflow, + * making MPTCP signaling invalid. For example, this may be sent + * if the checksum does not validate. + */ + SK_RST_REASON_MPTCP_RST_EMIDDLEBOX, + + /** @SK_RST_REASON_ERROR: unexpected error happens */ + SK_RST_REASON_ERROR, + + /** + * @SK_RST_REASON_MAX: Maximum of socket reset reasons. + * It shouldn't be used as a real 'reason'. + */ + SK_RST_REASON_MAX, +}; +#endif