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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Current File : //usr/include/linux/seg6.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 *  SR-IPv6 implementation
 *
 *  Author:
 *  David Lebrun <david.lebrun@uclouvain.be>
 *
 *
 *  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.
 */

#ifndef _LINUX_SEG6_H
#define _LINUX_SEG6_H

#include <linux/types.h>
#include <linux/in6.h>		/* For struct in6_addr. */

/*
 * SRH
 */
struct ipv6_sr_hdr {
	__u8	nexthdr;
	__u8	hdrlen;
	__u8	type;
	__u8	segments_left;
	__u8	first_segment; /* Represents the last_entry field of SRH */
	__u8	flags;
	__u16	tag;

	struct in6_addr segments[0];
};

#define SR6_FLAG1_PROTECTED	(1 << 6)
#define SR6_FLAG1_OAM		(1 << 5)
#define SR6_FLAG1_ALERT		(1 << 4)
#define SR6_FLAG1_HMAC		(1 << 3)

#define SR6_TLV_INGRESS		1
#define SR6_TLV_EGRESS		2
#define SR6_TLV_OPAQUE		3
#define SR6_TLV_PADDING		4
#define SR6_TLV_HMAC		5

#define sr_has_hmac(srh) ((srh)->flags & SR6_FLAG1_HMAC)

struct sr6_tlv {
	__u8 type;
	__u8 len;
	__u8 data[0];
};

#endif

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