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/atmlec.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * ATM Lan Emulation Daemon driver interface
 *
 * Marko Kiiskila <mkiiskila@yahoo.com>
 */

#ifndef _ATMLEC_H_
#define _ATMLEC_H_

#include <linux/atmapi.h>
#include <linux/atmioc.h>
#include <linux/atm.h>
#include <linux/if_ether.h>
#include <linux/types.h>

/* ATM lec daemon control socket */
#define ATMLEC_CTRL	_IO('a', ATMIOC_LANE)
#define ATMLEC_DATA	_IO('a', ATMIOC_LANE+1)
#define ATMLEC_MCAST	_IO('a', ATMIOC_LANE+2)

/* Maximum number of LEC interfaces (tweakable) */
#define MAX_LEC_ITF 48

typedef enum {
	l_set_mac_addr,
	l_del_mac_addr,
	l_svc_setup,
	l_addr_delete,
	l_topology_change,
	l_flush_complete,
	l_arp_update,
	l_narp_req,		/* LANE2 mandates the use of this */
	l_config,
	l_flush_tran_id,
	l_set_lecid,
	l_arp_xmt,
	l_rdesc_arp_xmt,
	l_associate_req,
	l_should_bridge		/* should we bridge this MAC? */
} atmlec_msg_type;

#define ATMLEC_MSG_TYPE_MAX l_should_bridge

struct atmlec_config_msg {
	unsigned int maximum_unknown_frame_count;
	unsigned int max_unknown_frame_time;
	unsigned short max_retry_count;
	unsigned int aging_time;
	unsigned int forward_delay_time;
	unsigned int arp_response_time;
	unsigned int flush_timeout;
	unsigned int path_switching_delay;
	unsigned int lane_version;	/* LANE2: 1 for LANEv1, 2 for LANEv2 */
	int mtu;
	int is_proxy;
};

struct atmlec_msg {
	atmlec_msg_type type;
	int sizeoftlvs;		/* LANE2: if != 0, tlvs follow */
	union {
		struct {
			unsigned char mac_addr[ETH_ALEN];
			unsigned char atm_addr[ATM_ESA_LEN];
			unsigned int flag;	/*
						 * Topology_change flag,
						 * remoteflag, permanent flag,
						 * lecid, transaction id
						 */
			unsigned int targetless_le_arp;	/* LANE2 */
			unsigned int no_source_le_narp;	/* LANE2 */
		} normal;
		struct atmlec_config_msg config;
		struct {
			__u16 lec_id;				/* requestor lec_id  */
			__u32 tran_id;				/* transaction id    */
			unsigned char mac_addr[ETH_ALEN];	/* dst mac addr      */
			unsigned char atm_addr[ATM_ESA_LEN];	/* reqestor ATM addr */
		} proxy;	/*
				 * For mapping LE_ARP requests to responses. Filled by
				 * zeppelin, returned by kernel. Used only when proxying
				 */
	} content;
} __ATM_API_ALIGN;

struct atmlec_ioc {
	int dev_num;
	unsigned char atm_addr[ATM_ESA_LEN];
	unsigned char receive;	/* 1= receive vcc, 0 = send vcc */
};
#endif /* _ATMLEC_H_ */

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