| /* 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 |
