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/route.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Global definitions for the IP router interface.
 *
 * Version:	@(#)route.h	1.0.3	05/27/93
 *
 * Authors:	Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
 *		for the purposes of compatibility only.
 *
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 * Changes:
 *              Mike McLagan    :       Routing by source
 *
 *		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_ROUTE_H
#define _LINUX_ROUTE_H

#include <linux/if.h>


/* This structure gets passed by the SIOCADDRT and SIOCDELRT calls. */
struct rtentry {
	unsigned long	rt_pad1;
	struct sockaddr	rt_dst;		/* target address		*/
	struct sockaddr	rt_gateway;	/* gateway addr (RTF_GATEWAY)	*/
	struct sockaddr	rt_genmask;	/* target network mask (IP)	*/
	unsigned short	rt_flags;
	short		rt_pad2;
	unsigned long	rt_pad3;
	void		*rt_pad4;
	short		rt_metric;	/* +1 for binary compatibility!	*/
	char *rt_dev;	/* forcing the device at add	*/
	unsigned long	rt_mtu;		/* per route MTU/Window 	*/
#define rt_mss	rt_mtu			/* Compatibility :-(            */
	unsigned long	rt_window;	/* Window clamping 		*/
	unsigned short	rt_irtt;	/* Initial RTT			*/
};


#define	RTF_UP		0x0001		/* route usable		  	*/
#define	RTF_GATEWAY	0x0002		/* destination is a gateway	*/
#define	RTF_HOST	0x0004		/* host entry (net otherwise)	*/
#define RTF_REINSTATE	0x0008		/* reinstate route after tmout	*/
#define	RTF_DYNAMIC	0x0010		/* created dyn. (by redirect)	*/
#define	RTF_MODIFIED	0x0020		/* modified dyn. (by redirect)	*/
#define RTF_MTU		0x0040		/* specific MTU for this route	*/
#define RTF_MSS		RTF_MTU		/* Compatibility :-(		*/
#define RTF_WINDOW	0x0080		/* per route window clamping	*/
#define RTF_IRTT	0x0100		/* Initial round trip time	*/
#define RTF_REJECT	0x0200		/* Reject route			*/

/*
 *	<linux/ipv6_route.h> uses RTF values >= 64k
 */



#endif	/* _LINUX_ROUTE_H */

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