golden hour

/usr/include/linux/netfilter

File/Folder	Size	Actions
ipset	-
nf_conntrack_common.h	3.81 KB
nf_conntrack_ftp.h	375 B
nf_conntrack_sctp.h	595 B
nf_conntrack_tcp.h	1.24 KB
nf_conntrack_tuple_common.h	708 B
nf_nat.h	1.12 KB
nf_tables.h	31.31 KB
nf_tables_compat.h	668 B
nfnetlink.h	2.01 KB
nfnetlink_acct.h	522 B
nfnetlink_compat.h	2.33 KB
nfnetlink_conntrack.h	5.42 KB
nfnetlink_cthelper.h	1.11 KB
nfnetlink_cttimeout.h	2.8 KB
nfnetlink_log.h	2.51 KB
nfnetlink_queue.h	2.88 KB
x_tables.h	4.3 KB
xt_AUDIT.h	655 B
xt_CHECKSUM.h	500 B
xt_CLASSIFY.h	154 B
xt_CONNMARK.h	136 B
xt_CONNSECMARK.h	238 B
xt_CT.h	790 B
xt_DSCP.h	709 B
xt_HMARK.h	841 B
xt_IDLETIMER.h	1.3 KB
xt_LED.h	407 B
xt_LOG.h	579 B
xt_MARK.h	121 B
xt_NFLOG.h	326 B
xt_NFQUEUE.h	716 B
xt_RATEEST.h	305 B
xt_SECMARK.h	486 B
xt_TCPMSS.h	172 B
xt_TCPOPTSTRIP.h	344 B
xt_TEE.h	240 B
xt_TPROXY.h	483 B
xt_addrtype.h	1021 B
xt_bpf.h	340 B
xt_cgroup.h	149 B
xt_cluster.h	311 B
xt_comment.h	167 B
xt_connbytes.h	514 B
xt_connlabel.h	217 B
xt_connlimit.h	571 B
xt_connmark.h	853 B
xt_conntrack.h	2.99 KB
xt_cpu.h	136 B
xt_dccp.h	420 B
xt_devgroup.h	366 B
xt_dscp.h	638 B
xt_ecn.h	673 B
xt_esp.h	355 B
xt_hashlimit.h	1.83 KB
xt_helper.h	125 B
xt_iprange.h	518 B
xt_ipvs.h	588 B
xt_length.h	158 B
xt_limit.h	610 B
xt_mac.h	135 B
xt_mark.h	473 B
xt_multiport.h	658 B
xt_nfacct.h	238 B
xt_osf.h	3.27 KB
xt_owner.h	557 B
xt_physdev.h	469 B
xt_pkttype.h	125 B
xt_policy.h	914 B
xt_quota.h	337 B
xt_rateest.h	774 B
xt_realm.h	157 B
xt_recent.h	966 B
xt_rpfilter.h	257 B
xt_sctp.h	2.22 KB
xt_set.h	1.38 KB
xt_socket.h	382 B
xt_state.h	268 B
xt_statistic.h	653 B
xt_string.h	601 B
xt_tcpmss.h	190 B
xt_tcpudp.h	1.16 KB
xt_time.h	667 B
xt_u32.h	689 B

Edit: nf_conntrack_common.h

#ifndef _NF_CONNTRACK_COMMON_H
#define _NF_CONNTRACK_COMMON_H
/* Connection state tracking for netfilter.  This is separated from,
   but required by, the NAT layer; it can also be used by an iptables
   extension. */
enum ip_conntrack_info {
	/* Part of an established connection (either direction). */
	IP_CT_ESTABLISHED,

/* Like NEW, but related to an existing connection, or ICMP error
	   (in either direction). */
	IP_CT_RELATED,

/* Started a new connection to track (only
           IP_CT_DIR_ORIGINAL); may be a retransmission. */
	IP_CT_NEW,

/* >= this indicates reply direction */
	IP_CT_IS_REPLY,

IP_CT_ESTABLISHED_REPLY = IP_CT_ESTABLISHED + IP_CT_IS_REPLY,
	IP_CT_RELATED_REPLY = IP_CT_RELATED + IP_CT_IS_REPLY,
	/* No NEW in reply direction. */

/* Number of distinct IP_CT types. */
	IP_CT_NUMBER,

/* only for userspace compatibility */
	IP_CT_NEW_REPLY = IP_CT_NUMBER,
};

#define NF_CT_STATE_INVALID_BIT			(1 << 0)
#define NF_CT_STATE_BIT(ctinfo)			(1 << ((ctinfo) % IP_CT_IS_REPLY + 1))
#define NF_CT_STATE_UNTRACKED_BIT		(1 << 6)

/* Bitset representing status of connection. */
enum ip_conntrack_status {
	/* It's an expected connection: bit 0 set.  This bit never changed */
	IPS_EXPECTED_BIT = 0,
	IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),

/* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
	IPS_SEEN_REPLY_BIT = 1,
	IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),

/* Conntrack should never be early-expired. */
	IPS_ASSURED_BIT = 2,
	IPS_ASSURED = (1 << IPS_ASSURED_BIT),

/* Connection is confirmed: originating packet has left box */
	IPS_CONFIRMED_BIT = 3,
	IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),

/* Connection needs src nat in orig dir.  This bit never changed. */
	IPS_SRC_NAT_BIT = 4,
	IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),

/* Connection needs dst nat in orig dir.  This bit never changed. */
	IPS_DST_NAT_BIT = 5,
	IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),

/* Both together. */
	IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),

/* Connection needs TCP sequence adjusted. */
	IPS_SEQ_ADJUST_BIT = 6,
	IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),

/* NAT initialization bits. */
	IPS_SRC_NAT_DONE_BIT = 7,
	IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),

IPS_DST_NAT_DONE_BIT = 8,
	IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),

/* Both together */
	IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),

/* Connection is dying (removed from lists), can not be unset. */
	IPS_DYING_BIT = 9,
	IPS_DYING = (1 << IPS_DYING_BIT),

/* Connection has fixed timeout. */
	IPS_FIXED_TIMEOUT_BIT = 10,
	IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),

/* Conntrack is a template */
	IPS_TEMPLATE_BIT = 11,
	IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),

/* Conntrack is a fake untracked entry.  Obsolete and not used anymore */
	IPS_UNTRACKED_BIT = 12,
	IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),

/* Conntrack got a helper explicitly attached via CT target. */
	IPS_HELPER_BIT = 13,
	IPS_HELPER = (1 << IPS_HELPER_BIT),
};

/* Connection tracking event types */
enum ip_conntrack_events {
	IPCT_NEW,		/* new conntrack */
	IPCT_RELATED,		/* related conntrack */
	IPCT_DESTROY,		/* destroyed conntrack */
	IPCT_REPLY,		/* connection has seen two-way traffic */
	IPCT_ASSURED,		/* connection status has changed to assured */
	IPCT_PROTOINFO,		/* protocol information has changed */
	IPCT_HELPER,		/* new helper has been set */
	IPCT_MARK,		/* new mark has been set */
	IPCT_SEQADJ,		/* sequence adjustment has changed */
	IPCT_NATSEQADJ = IPCT_SEQADJ,
	IPCT_SECMARK,		/* new security mark has been set */
	IPCT_LABEL,		/* new connlabel has been set */
};

enum ip_conntrack_expect_events {
	IPEXP_NEW,		/* new expectation */
	IPEXP_DESTROY,		/* destroyed expectation */
};

/* expectation flags */
#define NF_CT_EXPECT_PERMANENT		0x1
#define NF_CT_EXPECT_INACTIVE		0x2
#define NF_CT_EXPECT_USERSPACE		0x4

#endif /* _NF_CONNTRACK_COMMON_H */