晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef _XT_OSF_H
#define _XT_OSF_H

#include <linux/types.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/netfilter/nf_osf.h>

#define XT_OSF_GENRE		NF_OSF_GENRE
#define XT_OSF_INVERT		NF_OSF_INVERT

#define XT_OSF_TTL		NF_OSF_TTL
#define XT_OSF_LOG		NF_OSF_LOG

#define XT_OSF_LOGLEVEL_ALL		NF_OSF_LOGLEVEL_ALL
#define XT_OSF_LOGLEVEL_FIRST		NF_OSF_LOGLEVEL_FIRST
#define XT_OSF_LOGLEVEL_ALL_KNOWN	NF_OSF_LOGLEVEL_ALL_KNOWN

#define XT_OSF_TTL_TRUE		NF_OSF_TTL_TRUE
#define XT_OSF_TTL_NOCHECK	NF_OSF_TTL_NOCHECK

#define XT_OSF_TTL_LESS	1	/* Check if ip TTL is less than fingerprint one */

#define xt_osf_wc		nf_osf_wc
#define xt_osf_opt		nf_osf_opt
#define xt_osf_info		nf_osf_info
#define xt_osf_user_finger	nf_osf_user_finger
#define xt_osf_finger		nf_osf_finger
#define xt_osf_nlmsg		nf_osf_nlmsg

/*
 * 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 */

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