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linux
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mpls.h
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#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 */ #endif /* _MPLS_H */