From patchwork Tue Apr 16 11:39:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Xing X-Patchwork-Id: 13631717 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-oa1-f53.google.com (mail-oa1-f53.google.com [209.85.160.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A75BB129A74 for ; Tue, 16 Apr 2024 11:40:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.53 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713267624; cv=none; b=akXTWb/Lnng189sBWXKeFyE8PTuowR34JBw63bRO6esejA1tDiTEbteYk3ked3mf8/lOfEdW0TlPqmagU88JQRZXkzXXFuGXqO3zcKVW79l5gTWW8np+HiGeCNYf3dUmiH1IIrrR/Iy5sgWI9alba3CZLnzbarNRGDGuN8pHOfw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713267624; c=relaxed/simple; bh=RJnbFc5JHAO9cPZZJOzJbZBugWtXN/ZrYKzKfwfgFG0=; 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AJvYcCUoc/XUXiTueAa9W1UjiSJSVZADCvxJTDm7LYFADrBZ4/vMlxoH/hCYcr0p/RSkzP9YDaIRXYxGRM9j6MTQmXYqabPFIUnC X-Gm-Message-State: AOJu0Yy5c7CNypiVzY2BvorJuDFOS84/+Awt48rqr8+IUAr9pQMfFsJS 34UZjgAVSrq0hSp7/8m8d3wz9aYAmBHJeK0PVDlSiujBnEOQFq4f X-Google-Smtp-Source: AGHT+IG0uu+2aacCqrUFlmiuiLMgv4QcVanCDLIWG6wQyK6aBj9DGPhtrmVjFSdgM3BKuR42EM3dpQ== X-Received: by 2002:a05:6870:f286:b0:222:a91a:63cd with SMTP id u6-20020a056870f28600b00222a91a63cdmr13449674oap.45.1713267621604; Tue, 16 Apr 2024 04:40:21 -0700 (PDT) Received: from KERNELXING-MB0.tencent.com ([43.132.141.24]) by smtp.gmail.com with ESMTPSA id a21-20020aa78655000000b006e6c16179dbsm8862045pfo.24.2024.04.16.04.40.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Apr 2024 04:40:21 -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 Cc: mptcp@lists.linux.dev, netdev@vger.kernel.org, kerneljasonxing@gmail.com, Jason Xing Subject: [PATCH net-next v5 1/7] net: introduce rstreason to detect why the RST is sent Date: Tue, 16 Apr 2024 19:39:57 +0800 Message-Id: <20240416114003.62110-2-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20240416114003.62110-1-kerneljasonxing@gmail.com> References: <20240416114003.62110-1-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) reuse MP_TCPRST option for MPTCP 3) our own reasons I will implement the basic codes of active/passive reset reason in those three protocols, which is not complete for this moment. But it provides a new chance to let other people add more reasons into it:) Signed-off-by: Jason Xing --- include/net/rstreason.h | 93 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 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..0c3fa55fa62f --- /dev/null +++ b/include/net/rstreason.h @@ -0,0 +1,93 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef _LINUX_RSTREASON_H +#define _LINUX_RSTREASON_H +#include + +#define DEFINE_RST_REASON(FN, FNe) \ + 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(NOT_SPECIFIED) \ + FNe(MAX) + +#define RST_REASON_START (SKB_DROP_REASON_MAX + 1) + +/* There are three parts in order: + * 1) 0 - SKB_DROP_REASON_MAX: rely on drop reasons for passive reset in TCP + * 2) SKB_DROP_REASON_MAX + 1 - MPTCP_RST_EMIDDLEBOX: for MPTCP use + * 3) MPTCP_RST_EMIDDLEBOX - SK_RST_REASON_MAX: independent reset reason + */ +enum sk_rst_reason { + /* Leave this 'blank' part (0-SKB_DROP_REASON_MAX) for the reuse + * of skb drop reason because rst reason relies on what drop reason + * indicates exactly why it could happen. + */ + + /* 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. + */ + /* 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 = RST_REASON_START, + /* 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, + /* 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, + /* Administratively prohibited. + * This code indicates that the requested subflow is prohibited by + * the policies of the sending host. + */ + SK_RST_REASON_MPTCP_RST_EPROHIBIT, + /* 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, + /* 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, + /* 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, + + /* For the real standalone socket reset reason, we start from here */ + SK_RST_REASON_NOT_SPECIFIED, + + /* Maximum of socket reset reasons. + * It shouldn't be used as a real 'reason'. + */ + SK_RST_REASON_MAX, +}; + +static inline enum sk_rst_reason convert_mptcp_reason(u32 reason) +{ + return reason += RST_REASON_START; +} +#endif