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In multiple locations there are checks for whether the label in hand is a reserved label or not using the arbritray value of 16. Factor this out into a #define for better maintainability and for documentation. Signed-off-by: Robert Shearman <rshearma@brocade.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
#ifndef _UAPI_MPLS_H
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#define _UAPI_MPLS_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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/* Reference: RFC 5462, RFC 3032
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Label | TC |S| TTL |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Label: Label Value, 20 bits
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* TC: Traffic Class field, 3 bits
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* S: Bottom of Stack, 1 bit
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* TTL: Time to Live, 8 bits
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*/
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struct mpls_label {
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__be32 entry;
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};
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#define MPLS_LS_LABEL_MASK 0xFFFFF000
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#define MPLS_LS_LABEL_SHIFT 12
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#define MPLS_LS_TC_MASK 0x00000E00
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#define MPLS_LS_TC_SHIFT 9
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#define MPLS_LS_S_MASK 0x00000100
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#define MPLS_LS_S_SHIFT 8
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#define MPLS_LS_TTL_MASK 0x000000FF
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#define MPLS_LS_TTL_SHIFT 0
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/* Reserved labels */
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#define MPLS_LABEL_IPV4NULL 0 /* RFC3032 */
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#define MPLS_LABEL_RTALERT 1 /* RFC3032 */
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#define MPLS_LABEL_IPV6NULL 2 /* RFC3032 */
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#define MPLS_LABEL_IMPLNULL 3 /* RFC3032 */
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#define MPLS_LABEL_ENTROPY 7 /* RFC6790 */
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#define MPLS_LABEL_GAL 13 /* RFC5586 */
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#define MPLS_LABEL_OAMALERT 14 /* RFC3429 */
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#define MPLS_LABEL_EXTENSION 15 /* RFC7274 */
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#define MPLS_LABEL_FIRST_UNRESERVED 16 /* RFC3032 */
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#endif /* _UAPI_MPLS_H */
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