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/cfm_bridge.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */

#ifndef _LINUX_CFM_BRIDGE_H_
#define _LINUX_CFM_BRIDGE_H_

#include <linux/types.h>
#include <linux/if_ether.h>

#define ETHER_HEADER_LENGTH		(6+6+4+2)
#define CFM_MAID_LENGTH			48
#define CFM_CCM_PDU_LENGTH		75
#define CFM_PORT_STATUS_TLV_LENGTH	4
#define CFM_IF_STATUS_TLV_LENGTH	4
#define CFM_IF_STATUS_TLV_TYPE		4
#define CFM_PORT_STATUS_TLV_TYPE	2
#define CFM_ENDE_TLV_TYPE		0
#define CFM_CCM_MAX_FRAME_LENGTH	(ETHER_HEADER_LENGTH+\
					 CFM_CCM_PDU_LENGTH+\
					 CFM_PORT_STATUS_TLV_LENGTH+\
					 CFM_IF_STATUS_TLV_LENGTH)
#define CFM_FRAME_PRIO			7
#define CFM_CCM_TLV_OFFSET		70
#define CFM_CCM_PDU_MAID_OFFSET		10
#define CFM_CCM_PDU_MEPID_OFFSET	8
#define CFM_CCM_PDU_SEQNR_OFFSET	4
#define CFM_CCM_PDU_TLV_OFFSET		74
#define CFM_CCM_ITU_RESERVED_SIZE	16

struct br_cfm_common_hdr {
	__u8 mdlevel_version;
	__u8 opcode;
	__u8 flags;
	__u8 tlv_offset;
};

enum br_cfm_opcodes {
	BR_CFM_OPCODE_CCM = 0x1,
};

/* MEP domain */
enum br_cfm_domain {
	BR_CFM_PORT,
	BR_CFM_VLAN,
};

/* MEP direction */
enum br_cfm_mep_direction {
	BR_CFM_MEP_DIRECTION_DOWN,
	BR_CFM_MEP_DIRECTION_UP,
};

/* CCM interval supported. */
enum br_cfm_ccm_interval {
	BR_CFM_CCM_INTERVAL_NONE,
	BR_CFM_CCM_INTERVAL_3_3_MS,
	BR_CFM_CCM_INTERVAL_10_MS,
	BR_CFM_CCM_INTERVAL_100_MS,
	BR_CFM_CCM_INTERVAL_1_SEC,
	BR_CFM_CCM_INTERVAL_10_SEC,
	BR_CFM_CCM_INTERVAL_1_MIN,
	BR_CFM_CCM_INTERVAL_10_MIN,
};

#endif

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