/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_NF_CONNTRACK_TCP_H
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#define _UAPI_NF_CONNTRACK_TCP_H
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/* TCP tracking. */
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#include <linux/types.h>
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/* This is exposed to userspace (ctnetlink) */
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enum tcp_conntrack {
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TCP_CONNTRACK_NONE,
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TCP_CONNTRACK_SYN_SENT,
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TCP_CONNTRACK_SYN_RECV,
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TCP_CONNTRACK_ESTABLISHED,
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TCP_CONNTRACK_FIN_WAIT,
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TCP_CONNTRACK_CLOSE_WAIT,
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TCP_CONNTRACK_LAST_ACK,
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TCP_CONNTRACK_TIME_WAIT,
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TCP_CONNTRACK_CLOSE,
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TCP_CONNTRACK_LISTEN, /* obsolete */
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#define TCP_CONNTRACK_SYN_SENT2 TCP_CONNTRACK_LISTEN
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TCP_CONNTRACK_MAX,
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TCP_CONNTRACK_IGNORE,
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TCP_CONNTRACK_RETRANS,
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TCP_CONNTRACK_UNACK,
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TCP_CONNTRACK_TIMEOUT_MAX
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};
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/* Window scaling is advertised by the sender */
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#define IP_CT_TCP_FLAG_WINDOW_SCALE 0x01
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/* SACK is permitted by the sender */
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#define IP_CT_TCP_FLAG_SACK_PERM 0x02
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/* This sender sent FIN first */
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#define IP_CT_TCP_FLAG_CLOSE_INIT 0x04
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/* Be liberal in window checking */
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#define IP_CT_TCP_FLAG_BE_LIBERAL 0x08
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/* Has unacknowledged data */
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#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED 0x10
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/* The field td_maxack has been set */
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#define IP_CT_TCP_FLAG_MAXACK_SET 0x20
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/* Marks possibility for expected RFC5961 challenge ACK */
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#define IP_CT_EXP_CHALLENGE_ACK 0x40
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/* Simultaneous open initialized */
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#define IP_CT_TCP_SIMULTANEOUS_OPEN 0x80
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struct nf_ct_tcp_flags {
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__u8 flags;
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__u8 mask;
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};
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#endif /* _UAPI_NF_CONNTRACK_TCP_H */
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