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/netpacket/packet.h
/* Definitions for use with Linux AF_PACKET sockets.
   Copyright (C) 1998-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef __NETPACKET_PACKET_H
#define __NETPACKET_PACKET_H	1

struct sockaddr_ll
  {
    unsigned short int sll_family;
    unsigned short int sll_protocol;
    int sll_ifindex;
    unsigned short int sll_hatype;
    unsigned char sll_pkttype;
    unsigned char sll_halen;
    unsigned char sll_addr[8];
  };

/* Packet types.  */

#define PACKET_HOST		0		/* To us.  */
#define PACKET_BROADCAST	1		/* To all.  */
#define PACKET_MULTICAST	2		/* To group.  */
#define PACKET_OTHERHOST	3		/* To someone else.  */
#define PACKET_OUTGOING		4		/* Originated by us . */
#define PACKET_LOOPBACK		5
#define PACKET_FASTROUTE	6

/* Packet socket options.  */

#define PACKET_ADD_MEMBERSHIP		1
#define PACKET_DROP_MEMBERSHIP		2
#define	PACKET_RECV_OUTPUT		3
#define	PACKET_RX_RING			5
#define	PACKET_STATISTICS		6
#define	PACKET_COPY_THRESH		7
#define	PACKET_AUXDATA			8
#define	PACKET_ORIGDEV			9
#define	PACKET_VERSION			10
#define	PACKET_HDRLEN			11
#define	PACKET_RESERVE			12
#define	PACKET_TX_RING			13
#define	PACKET_LOSS			14
#define	PACKET_VNET_HDR			15
#define	PACKET_TX_TIMESTAMP		16
#define	PACKET_TIMESTAMP		17
#define	PACKET_FANOUT			18
#define	PACKET_TX_HAS_OFF		19
#define	PACKET_QDISC_BYPASS		20
#define	PACKET_ROLLOVER_STATS		21
#define	PACKET_FANOUT_DATA		22

struct packet_mreq
  {
    int mr_ifindex;
    unsigned short int mr_type;
    unsigned short int mr_alen;
    unsigned char mr_address[8];
  };

#define PACKET_MR_MULTICAST	0
#define PACKET_MR_PROMISC	1
#define PACKET_MR_ALLMULTI	2
#define PACKET_MR_UNICAST	3

#endif	/* netpacket/packet.h */

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