1#ifndef _UAPI_MPLS_H 2#define _UAPI_MPLS_H 3 4#include <linux/types.h> 5#include <asm/byteorder.h> 6 7/* Reference: RFC 5462, RFC 3032 8 * 9 * 0 1 2 3 10 * 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 11 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 12 * | Label | TC |S| TTL | 13 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 14 * 15 * Label: Label Value, 20 bits 16 * TC: Traffic Class field, 3 bits 17 * S: Bottom of Stack, 1 bit 18 * TTL: Time to Live, 8 bits 19 */ 20 21struct mpls_label { 22 __be32 entry; 23}; 24 25#define MPLS_LS_LABEL_MASK 0xFFFFF000 26#define MPLS_LS_LABEL_SHIFT 12 27#define MPLS_LS_TC_MASK 0x00000E00 28#define MPLS_LS_TC_SHIFT 9 29#define MPLS_LS_S_MASK 0x00000100 30#define MPLS_LS_S_SHIFT 8 31#define MPLS_LS_TTL_MASK 0x000000FF 32#define MPLS_LS_TTL_SHIFT 0 33 34/* Reserved labels */ 35#define MPLS_LABEL_IPV4NULL 0 /* RFC3032 */ 36#define MPLS_LABEL_RTALERT 1 /* RFC3032 */ 37#define MPLS_LABEL_IPV6NULL 2 /* RFC3032 */ 38#define MPLS_LABEL_IMPLNULL 3 /* RFC3032 */ 39#define MPLS_LABEL_ENTROPY 7 /* RFC6790 */ 40#define MPLS_LABEL_GAL 13 /* RFC5586 */ 41#define MPLS_LABEL_OAMALERT 14 /* RFC3429 */ 42#define MPLS_LABEL_EXTENSION 15 /* RFC7274 */ 43 44#define MPLS_LABEL_FIRST_UNRESERVED 16 /* RFC3032 */ 45 46#endif /* _UAPI_MPLS_H */ 47