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/tc_act/tc_tunnel_key.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
 * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
 */

#ifndef __LINUX_TC_TUNNEL_KEY_H
#define __LINUX_TC_TUNNEL_KEY_H

#include <linux/pkt_cls.h>

#define TCA_TUNNEL_KEY_ACT_SET	    1
#define TCA_TUNNEL_KEY_ACT_RELEASE  2

struct tc_tunnel_key {
	tc_gen;
	int t_action;
};

enum {
	TCA_TUNNEL_KEY_UNSPEC,
	TCA_TUNNEL_KEY_TM,
	TCA_TUNNEL_KEY_PARMS,
	TCA_TUNNEL_KEY_ENC_IPV4_SRC,	/* be32 */
	TCA_TUNNEL_KEY_ENC_IPV4_DST,	/* be32 */
	TCA_TUNNEL_KEY_ENC_IPV6_SRC,	/* struct in6_addr */
	TCA_TUNNEL_KEY_ENC_IPV6_DST,	/* struct in6_addr */
	TCA_TUNNEL_KEY_ENC_KEY_ID,	/* be64 */
	TCA_TUNNEL_KEY_PAD,
	TCA_TUNNEL_KEY_ENC_DST_PORT,	/* be16 */
	TCA_TUNNEL_KEY_NO_CSUM,		/* u8 */
	TCA_TUNNEL_KEY_ENC_OPTS,	/* Nested TCA_TUNNEL_KEY_ENC_OPTS_
					 * attributes
					 */
	TCA_TUNNEL_KEY_ENC_TOS,		/* u8 */
	TCA_TUNNEL_KEY_ENC_TTL,		/* u8 */
	TCA_TUNNEL_KEY_NO_FRAG,		/* flag */
	__TCA_TUNNEL_KEY_MAX,
};

#define TCA_TUNNEL_KEY_MAX (__TCA_TUNNEL_KEY_MAX - 1)

enum {
	TCA_TUNNEL_KEY_ENC_OPTS_UNSPEC,
	TCA_TUNNEL_KEY_ENC_OPTS_GENEVE,		/* Nested
						 * TCA_TUNNEL_KEY_ENC_OPTS_
						 * attributes
						 */
	TCA_TUNNEL_KEY_ENC_OPTS_VXLAN,		/* Nested
						 * TCA_TUNNEL_KEY_ENC_OPTS_
						 * attributes
						 */
	TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN,		/* Nested
						 * TCA_TUNNEL_KEY_ENC_OPTS_
						 * attributes
						 */
	__TCA_TUNNEL_KEY_ENC_OPTS_MAX,
};

#define TCA_TUNNEL_KEY_ENC_OPTS_MAX (__TCA_TUNNEL_KEY_ENC_OPTS_MAX - 1)

enum {
	TCA_TUNNEL_KEY_ENC_OPT_GENEVE_UNSPEC,
	TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,		/* be16 */
	TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,		/* u8 */
	TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,		/* 4 to 128 bytes */

	__TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
};

#define TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX \
	(__TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX - 1)

enum {
	TCA_TUNNEL_KEY_ENC_OPT_VXLAN_UNSPEC,
	TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP,		/* u32 */
	__TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX,
};

#define TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX \
	(__TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX - 1)

enum {
	TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_UNSPEC,
	TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER,		/* u8 */
	TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX,		/* be32 */
	TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR,		/* u8 */
	TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID,		/* u8 */
	__TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX,
};

#define TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX \
	(__TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX - 1)

#endif

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