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/ax25.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * These are the public elements of the Linux kernel AX.25 code. A similar
 * file netrom.h exists for the NET/ROM protocol.
 */

#ifndef	AX25_KERNEL_H
#define	AX25_KERNEL_H

#include <linux/socket.h>

#define AX25_MTU	256
#define AX25_MAX_DIGIS  8

#define AX25_WINDOW	1
#define AX25_T1		2
#define AX25_N2		3
#define AX25_T3		4
#define AX25_T2		5
#define	AX25_BACKOFF	6
#define	AX25_EXTSEQ	7
#define	AX25_PIDINCL	8
#define AX25_IDLE	9
#define AX25_PACLEN	10
#define AX25_IAMDIGI	12

#define AX25_KILL	99

#define SIOCAX25GETUID		(SIOCPROTOPRIVATE+0)
#define SIOCAX25ADDUID		(SIOCPROTOPRIVATE+1)
#define SIOCAX25DELUID		(SIOCPROTOPRIVATE+2)
#define SIOCAX25NOUID		(SIOCPROTOPRIVATE+3)
#define SIOCAX25OPTRT		(SIOCPROTOPRIVATE+7)
#define SIOCAX25CTLCON		(SIOCPROTOPRIVATE+8)
#define SIOCAX25GETINFOOLD	(SIOCPROTOPRIVATE+9)
#define SIOCAX25ADDFWD		(SIOCPROTOPRIVATE+10)
#define SIOCAX25DELFWD		(SIOCPROTOPRIVATE+11)
#define SIOCAX25DEVCTL          (SIOCPROTOPRIVATE+12)
#define SIOCAX25GETINFO         (SIOCPROTOPRIVATE+13)

#define AX25_SET_RT_IPMODE	2

#define AX25_NOUID_DEFAULT	0
#define AX25_NOUID_BLOCK	1

typedef struct {
	char		ax25_call[7];	/* 6 call + SSID (shifted ascii!) */
} ax25_address;

struct sockaddr_ax25 {
	__kernel_sa_family_t sax25_family;
	ax25_address	sax25_call;
	int		sax25_ndigis;
	/* Digipeater ax25_address sets follow */
};

#define sax25_uid	sax25_ndigis

struct full_sockaddr_ax25 {
	struct sockaddr_ax25 fsa_ax25;
	ax25_address	fsa_digipeater[AX25_MAX_DIGIS];
};

struct ax25_routes_struct {
	ax25_address	port_addr;
	ax25_address	dest_addr;
	unsigned char	digi_count;
	ax25_address	digi_addr[AX25_MAX_DIGIS];
};

struct ax25_route_opt_struct {
	ax25_address	port_addr;
	ax25_address	dest_addr;
	int		cmd;
	int		arg;
};

struct ax25_ctl_struct {
        ax25_address            port_addr;
        ax25_address            source_addr;
        ax25_address            dest_addr;
        unsigned int            cmd;
        unsigned long           arg;
        unsigned char           digi_count;
        ax25_address            digi_addr[AX25_MAX_DIGIS];
};

/* this will go away. Please do not export to user land */
struct ax25_info_struct_deprecated {
	unsigned int	n2, n2count;
	unsigned int	t1, t1timer;
	unsigned int	t2, t2timer;
	unsigned int	t3, t3timer;
	unsigned int	idle, idletimer;
	unsigned int	state;
	unsigned int	rcv_q, snd_q;
};

struct ax25_info_struct {
	unsigned int	n2, n2count;
	unsigned int	t1, t1timer;
	unsigned int	t2, t2timer;
	unsigned int	t3, t3timer;
	unsigned int	idle, idletimer;
	unsigned int	state;
	unsigned int	rcv_q, snd_q;
	unsigned int	vs, vr, va, vs_max;
	unsigned int	paclen;
	unsigned int	window;
};

struct ax25_fwd_struct {
	ax25_address	port_from;
	ax25_address	port_to;
};

#endif

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