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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _LINUX_RSTREASON_H
#define _LINUX_RSTREASON_H
#include <net/dropreason-core.h>
#include <uapi/linux/mptcp.h>
#define DEFINE_RST_REASON(FN, FNe) \
FN(NOT_SPECIFIED) \
FN(NO_SOCKET) \
FN(TCP_INVALID_ACK_SEQUENCE) \
FN(TCP_RFC7323_PAWS) \
FN(TCP_TOO_OLD_ACK) \
FN(TCP_ACK_UNSENT_DATA) \
FN(TCP_FLAGS) \
FN(TCP_OLD_ACK) \
FN(TCP_ABORT_ON_DATA) \
FN(TCP_TIMEWAIT_SOCKET) \
FN(INVALID_SYN) \
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,
/**
* @SK_RST_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
* field because ack sequence is not in the window between snd_una
* and snd_nxt
*/
SK_RST_REASON_TCP_INVALID_ACK_SEQUENCE,
/**
* @SK_RST_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
* LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
*/
SK_RST_REASON_TCP_RFC7323_PAWS,
/** @SK_RST_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
SK_RST_REASON_TCP_TOO_OLD_ACK,
/**
* @SK_RST_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
* sent yet
*/
SK_RST_REASON_TCP_ACK_UNSENT_DATA,
/** @SK_RST_REASON_TCP_FLAGS: TCP flags invalid */
SK_RST_REASON_TCP_FLAGS,
/** @SK_RST_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
SK_RST_REASON_TCP_OLD_ACK,
/**
* @SK_RST_REASON_TCP_ABORT_ON_DATA: abort on data
* corresponding to LINUX_MIB_TCPABORTONDATA
*/
SK_RST_REASON_TCP_ABORT_ON_DATA,
/* Here start with the independent reasons */
/** @SK_RST_REASON_TCP_TIMEWAIT_SOCKET: happen on the timewait socket */
SK_RST_REASON_TCP_TIMEWAIT_SOCKET,
/**
* @SK_RST_REASON_INVALID_SYN: receive bad syn packet
* RFC 793 says if the state is not CLOSED/LISTEN/SYN-SENT then
* "fourth, check the SYN bit,...If the SYN is in the window it is
* an error, send a reset"
*/
SK_RST_REASON_INVALID_SYN,
/* 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,
};
/* Convert skb drop reasons to enum sk_rst_reason type */
static inline enum sk_rst_reason
sk_rst_convert_drop_reason(enum skb_drop_reason reason)
{
switch (reason) {
case SKB_DROP_REASON_NOT_SPECIFIED:
return SK_RST_REASON_NOT_SPECIFIED;
case SKB_DROP_REASON_NO_SOCKET:
return SK_RST_REASON_NO_SOCKET;
case SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE:
return SK_RST_REASON_TCP_INVALID_ACK_SEQUENCE;
case SKB_DROP_REASON_TCP_RFC7323_PAWS:
return SK_RST_REASON_TCP_RFC7323_PAWS;
case SKB_DROP_REASON_TCP_TOO_OLD_ACK:
return SK_RST_REASON_TCP_TOO_OLD_ACK;
case SKB_DROP_REASON_TCP_ACK_UNSENT_DATA:
return SK_RST_REASON_TCP_ACK_UNSENT_DATA;
case SKB_DROP_REASON_TCP_FLAGS:
return SK_RST_REASON_TCP_FLAGS;
case SKB_DROP_REASON_TCP_OLD_ACK:
return SK_RST_REASON_TCP_OLD_ACK;
case SKB_DROP_REASON_TCP_ABORT_ON_DATA:
return SK_RST_REASON_TCP_ABORT_ON_DATA;
default:
/* If we don't have our own corresponding reason */
return SK_RST_REASON_NOT_SPECIFIED;
}
}
#endif
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