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　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。 . Prv8 Shell

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Directory : /usr/include/linux/netfilter/

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Current File : //usr/include/linux/netfilter/nf_conntrack_tcp.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _NF_CONNTRACK_TCP_H
#define _NF_CONNTRACK_TCP_H
/* TCP tracking. */

#include <linux/types.h>

/* This is exposed to userspace (ctnetlink) */
enum tcp_conntrack {
	TCP_CONNTRACK_NONE,
	TCP_CONNTRACK_SYN_SENT,
	TCP_CONNTRACK_SYN_RECV,
	TCP_CONNTRACK_ESTABLISHED,
	TCP_CONNTRACK_FIN_WAIT,
	TCP_CONNTRACK_CLOSE_WAIT,
	TCP_CONNTRACK_LAST_ACK,
	TCP_CONNTRACK_TIME_WAIT,
	TCP_CONNTRACK_CLOSE,
	TCP_CONNTRACK_LISTEN,	/* obsolete */
#define TCP_CONNTRACK_SYN_SENT2	TCP_CONNTRACK_LISTEN
	TCP_CONNTRACK_MAX,
	TCP_CONNTRACK_IGNORE,
	TCP_CONNTRACK_RETRANS,
	TCP_CONNTRACK_UNACK,
	TCP_CONNTRACK_TIMEOUT_MAX
};

/* Window scaling is advertised by the sender */
#define IP_CT_TCP_FLAG_WINDOW_SCALE		0x01

/* SACK is permitted by the sender */
#define IP_CT_TCP_FLAG_SACK_PERM		0x02

/* This sender sent FIN first */
#define IP_CT_TCP_FLAG_CLOSE_INIT		0x04

/* Be liberal in window checking */
#define IP_CT_TCP_FLAG_BE_LIBERAL		0x08

/* Has unacknowledged data */
#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED	0x10

/* The field td_maxack has been set */
#define IP_CT_TCP_FLAG_MAXACK_SET		0x20

/* Marks possibility for expected RFC5961 challenge ACK */
#define IP_CT_EXP_CHALLENGE_ACK 		0x40

/* Simultaneous open initialized */
#define IP_CT_TCP_SIMULTANEOUS_OPEN		0x80

struct nf_ct_tcp_flags {
	__u8 flags;
	__u8 mask;
};


#endif /* _NF_CONNTRACK_TCP_H */

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