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

#include <linux/virtio_vsock.h>

/*
 * vsockmon is the AF_VSOCK packet capture device.  Packets captured have the
 * following layout:
 *
 *   +-----------------------------------+
 *   |           vsockmon header         |
 *   |      (struct af_vsockmon_hdr)     |
 *   +-----------------------------------+
 *   |          transport header         |
 *   | (af_vsockmon_hdr->len bytes long) |
 *   +-----------------------------------+
 *   |              payload              |
 *   |       (until end of packet)       |
 *   +-----------------------------------+
 *
 * The vsockmon header is a transport-independent description of the packet.
 * It duplicates some of the information from the transport header so that
 * no transport-specific knowledge is necessary to process packets.
 *
 * The transport header is useful for low-level transport-specific packet
 * analysis.  Transport type is given in af_vsockmon_hdr->transport and
 * transport header length is given in af_vsockmon_hdr->len.
 *
 * If af_vsockmon_hdr->op is AF_VSOCK_OP_PAYLOAD then the payload follows the
 * transport header.  Other ops do not have a payload.
 */

struct af_vsockmon_hdr {
	__le64 src_cid;
	__le64 dst_cid;
	__le32 src_port;
	__le32 dst_port;
	__le16 op;			/* enum af_vsockmon_op */
	__le16 transport;		/* enum af_vsockmon_transport */
	__le16 len;			/* Transport header length */
	__u8 reserved[2];
};

enum af_vsockmon_op {
	AF_VSOCK_OP_UNKNOWN = 0,
	AF_VSOCK_OP_CONNECT = 1,
	AF_VSOCK_OP_DISCONNECT = 2,
	AF_VSOCK_OP_CONTROL = 3,
	AF_VSOCK_OP_PAYLOAD = 4,
};

enum af_vsockmon_transport {
	AF_VSOCK_TRANSPORT_UNKNOWN = 0,
	AF_VSOCK_TRANSPORT_NO_INFO = 1,	/* No transport information */

	/* Transport header type: struct virtio_vsock_hdr */
	AF_VSOCK_TRANSPORT_VIRTIO = 2,
};

#endif

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