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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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Current File : //usr/include/linux/nexthop.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_NEXTHOP_H
#define _LINUX_NEXTHOP_H

#include <linux/types.h>

struct nhmsg {
	unsigned char	nh_family;
	unsigned char	nh_scope;     /* return only */
	unsigned char	nh_protocol;  /* Routing protocol that installed nh */
	unsigned char	resvd;
	unsigned int	nh_flags;     /* RTNH_F flags */
};

/* entry in a nexthop group */
struct nexthop_grp {
	__u32	id;	  /* nexthop id - must exist */
	__u8	weight;   /* weight of this nexthop */
	__u8	resvd1;
	__u16	resvd2;
};

enum {
	NEXTHOP_GRP_TYPE_MPATH,  /* default type if not specified */
	__NEXTHOP_GRP_TYPE_MAX,
};

#define NEXTHOP_GRP_TYPE_MAX (__NEXTHOP_GRP_TYPE_MAX - 1)

enum {
	NHA_UNSPEC,
	NHA_ID,		/* u32; id for nexthop. id == 0 means auto-assign */

	NHA_GROUP,	/* array of nexthop_grp */
	NHA_GROUP_TYPE,	/* u16 one of NEXTHOP_GRP_TYPE */
	/* if NHA_GROUP attribute is added, no other attributes can be set */

	NHA_BLACKHOLE,	/* flag; nexthop used to blackhole packets */
	/* if NHA_BLACKHOLE is added, OIF, GATEWAY, ENCAP can not be set */

	NHA_OIF,	/* u32; nexthop device */
	NHA_GATEWAY,	/* be32 (IPv4) or in6_addr (IPv6) gw address */
	NHA_ENCAP_TYPE, /* u16; lwt encap type */
	NHA_ENCAP,	/* lwt encap data */

	/* NHA_OIF can be appended to dump request to return only
	 * nexthops using given device
	 */
	NHA_GROUPS,	/* flag; only return nexthop groups in dump */
	NHA_MASTER,	/* u32;  only return nexthops with given master dev */

	__NHA_MAX,
};

#define NHA_MAX	(__NHA_MAX - 1)
#endif

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