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

#include <linux/types.h>
#include <asm/byteorder.h>

/* Reference: RFC 5462, RFC 3032
 *
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                Label                  | TC  |S|       TTL     |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 *	Label:  Label Value, 20 bits
 *	TC:     Traffic Class field, 3 bits
 *	S:      Bottom of Stack, 1 bit
 *	TTL:    Time to Live, 8 bits
 */

struct mpls_label {
	__be32 entry;
};

#define MPLS_LS_LABEL_MASK      0xFFFFF000
#define MPLS_LS_LABEL_SHIFT     12
#define MPLS_LS_TC_MASK         0x00000E00
#define MPLS_LS_TC_SHIFT        9
#define MPLS_LS_S_MASK          0x00000100
#define MPLS_LS_S_SHIFT         8
#define MPLS_LS_TTL_MASK        0x000000FF
#define MPLS_LS_TTL_SHIFT       0

/* Reserved labels */
#define MPLS_LABEL_IPV4NULL		0 /* RFC3032 */
#define MPLS_LABEL_RTALERT		1 /* RFC3032 */
#define MPLS_LABEL_IPV6NULL		2 /* RFC3032 */
#define MPLS_LABEL_IMPLNULL		3 /* RFC3032 */
#define MPLS_LABEL_ENTROPY		7 /* RFC6790 */
#define MPLS_LABEL_GAL			13 /* RFC5586 */
#define MPLS_LABEL_OAMALERT		14 /* RFC3429 */
#define MPLS_LABEL_EXTENSION		15 /* RFC7274 */

#define MPLS_LABEL_FIRST_UNRESERVED	16 /* RFC3032 */

/* These are embedded into IFLA_STATS_AF_SPEC:
 * [IFLA_STATS_AF_SPEC]
 * -> [AF_MPLS]
 *    -> [MPLS_STATS_xxx]
 *
 * Attributes:
 * [MPLS_STATS_LINK] = {
 *     struct mpls_link_stats
 * }
 */
enum {
	MPLS_STATS_UNSPEC, /* also used as 64bit pad attribute */
	MPLS_STATS_LINK,
	__MPLS_STATS_MAX,
};

#define MPLS_STATS_MAX (__MPLS_STATS_MAX - 1)

struct mpls_link_stats {
	__u64	rx_packets;		/* total packets received	*/
	__u64	tx_packets;		/* total packets transmitted	*/
	__u64	rx_bytes;		/* total bytes received		*/
	__u64	tx_bytes;		/* total bytes transmitted	*/
	__u64	rx_errors;		/* bad packets received		*/
	__u64	tx_errors;		/* packet transmit problems	*/
	__u64	rx_dropped;		/* packet dropped on receive	*/
	__u64	tx_dropped;		/* packet dropped on transmit	*/
	__u64	rx_noroute;		/* no route for packet dest	*/
};

#endif /* _MPLS_H */

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