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: xt_osf.h

/*
 * Copyright (c) 2003+ Evgeniy Polyakov <johnpol@2ka.mxt.ru>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef _XT_OSF_H
#define _XT_OSF_H

#include <linux/types.h>

#define MAXGENRELEN		32

#define XT_OSF_GENRE		(1<<0)
#define	XT_OSF_TTL		(1<<1)
#define XT_OSF_LOG		(1<<2)
#define XT_OSF_INVERT		(1<<3)

#define XT_OSF_LOGLEVEL_ALL	0	/* log all matched fingerprints */
#define XT_OSF_LOGLEVEL_FIRST	1	/* log only the first matced fingerprint */
#define XT_OSF_LOGLEVEL_ALL_KNOWN	2 /* do not log unknown packets */

#define XT_OSF_TTL_TRUE		0	/* True ip and fingerprint TTL comparison */
#define XT_OSF_TTL_LESS		1	/* Check if ip TTL is less than fingerprint one */
#define XT_OSF_TTL_NOCHECK	2	/* Do not compare ip and fingerprint TTL at all */

struct xt_osf_info {
	char			genre[MAXGENRELEN];
	__u32			len;
	__u32			flags;
	__u32			loglevel;
	__u32			ttl;
};

/*
 * Wildcard MSS (kind of).
 * It is used to implement a state machine for the different wildcard values
 * of the MSS and window sizes.
 */
struct xt_osf_wc {
	__u32			wc;
	__u32			val;
};

/*
 * This struct represents IANA options
 * http://www.iana.org/assignments/tcp-parameters
 */
struct xt_osf_opt {
	__u16			kind, length;
	struct xt_osf_wc	wc;
};

struct xt_osf_user_finger {
	struct xt_osf_wc	wss;

__u8			ttl, df;
	__u16			ss, mss;
	__u16			opt_num;

char			genre[MAXGENRELEN];
	char			version[MAXGENRELEN];
	char			subtype[MAXGENRELEN];

/* MAX_IPOPTLEN is maximum if all options are NOPs or EOLs */
	struct xt_osf_opt	opt[MAX_IPOPTLEN];
};

struct xt_osf_nlmsg {
	struct xt_osf_user_finger	f;
	struct iphdr		ip;
	struct tcphdr		tcp;
};

/* Defines for IANA option kinds */

enum iana_options {
	OSFOPT_EOL = 0,		/* End of options */
	OSFOPT_NOP, 		/* NOP */
	OSFOPT_MSS, 		/* Maximum segment size */
	OSFOPT_WSO, 		/* Window scale option */
	OSFOPT_SACKP,		/* SACK permitted */
	OSFOPT_SACK,		/* SACK */
	OSFOPT_ECHO,
	OSFOPT_ECHOREPLY,
	OSFOPT_TS,		/* Timestamp option */
	OSFOPT_POCP,		/* Partial Order Connection Permitted */
	OSFOPT_POSP,		/* Partial Order Service Profile */

/* Others are not used in the current OSF */
	OSFOPT_EMPTY = 255,
};

/*
 * Initial window size option state machine: multiple of mss, mtu or
 * plain numeric value. Can also be made as plain numeric value which
 * is not a multiple of specified value.
 */
enum xt_osf_window_size_options {
	OSF_WSS_PLAIN	= 0,
	OSF_WSS_MSS,
	OSF_WSS_MTU,
	OSF_WSS_MODULO,
	OSF_WSS_MAX,
};

/*
 * Add/remove fingerprint from the kernel.
 */
enum xt_osf_msg_types {
	OSF_MSG_ADD,
	OSF_MSG_REMOVE,
	OSF_MSG_MAX,
};

enum xt_osf_attr_type {
	OSF_ATTR_UNSPEC,
	OSF_ATTR_FINGER,
	OSF_ATTR_MAX,
};

#endif				/* _XT_OSF_H */