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/netfilter_decnet.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __LINUX_DECNET_NETFILTER_H
#define __LINUX_DECNET_NETFILTER_H

/* DECnet-specific defines for netfilter. 
 * This file (C) Steve Whitehouse 1999 derived from the
 * ipv4 netfilter header file which is
 * (C)1998 Rusty Russell -- This code is GPL.
 */

#include <linux/netfilter.h>

/* only for userspace compatibility */

#include <limits.h> /* for INT_MIN, INT_MAX */

/* IP Cache bits. */
/* Src IP address. */
#define NFC_DN_SRC		0x0001
/* Dest IP address. */
#define NFC_DN_DST		0x0002
/* Input device. */
#define NFC_DN_IF_IN		0x0004
/* Output device. */
#define NFC_DN_IF_OUT		0x0008

/* kernel define is in netfilter_defs.h */
#define NF_DN_NUMHOOKS		7

/* DECnet Hooks */
/* After promisc drops, checksum checks. */
#define NF_DN_PRE_ROUTING	0
/* If the packet is destined for this box. */
#define NF_DN_LOCAL_IN		1
/* If the packet is destined for another interface. */
#define NF_DN_FORWARD		2
/* Packets coming from a local process. */
#define NF_DN_LOCAL_OUT		3
/* Packets about to hit the wire. */
#define NF_DN_POST_ROUTING	4
/* Input Hello Packets */
#define NF_DN_HELLO		5
/* Input Routing Packets */
#define NF_DN_ROUTE		6

enum nf_dn_hook_priorities {
	NF_DN_PRI_FIRST = INT_MIN,
	NF_DN_PRI_CONNTRACK = -200,
	NF_DN_PRI_MANGLE = -150,
	NF_DN_PRI_NAT_DST = -100,
	NF_DN_PRI_FILTER = 0,
	NF_DN_PRI_NAT_SRC = 100,
	NF_DN_PRI_DNRTMSG = 200,
	NF_DN_PRI_LAST = INT_MAX,
};

struct nf_dn_rtmsg {
	int nfdn_ifindex;
};

#define NFDN_RTMSG(r) ((unsigned char *)(r) + NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg)))

/* backwards compatibility for userspace */
#define DNRMG_L1_GROUP 0x01
#define DNRMG_L2_GROUP 0x02

enum {
	DNRNG_NLGRP_NONE,
#define DNRNG_NLGRP_NONE	DNRNG_NLGRP_NONE
	DNRNG_NLGRP_L1,
#define DNRNG_NLGRP_L1		DNRNG_NLGRP_L1
	DNRNG_NLGRP_L2,
#define DNRNG_NLGRP_L2		DNRNG_NLGRP_L2
	__DNRNG_NLGRP_MAX
};
#define DNRNG_NLGRP_MAX	(__DNRNG_NLGRP_MAX - 1)

#endif /*__LINUX_DECNET_NETFILTER_H*/

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