projects / linux.git / blame
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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* Copyright (c) 2024 Pengutronix, Oleksij Rempel <[email protected]> */ | |
| 3 | ||
| 4 | #ifndef __DSCP_H__ | |
| 5 | #define __DSCP_H__ | |
| 6 | ||
| 7 | /* | |
| 8 | * DSCP Pools and Codepoint Space Division: | |
| 9 | * | |
| 10 | * The Differentiated Services (Diffserv) architecture defines a method for | |
| 11 | * classifying and managing network traffic using the DS field in IPv4 and IPv6 | |
| 12 | * packet headers. This field can carry one of 64 distinct DSCP (Differentiated | |
| 13 | * Services Code Point) values, which are divided into three pools based on | |
| 14 | * their Least Significant Bits (LSB) patterns and intended usage. Each pool has | |
| 15 | * a specific registration procedure for assigning DSCP values: | |
| 16 | * | |
| 17 | * Pool 1 (Standards Action Pool): | |
| 18 | * - Codepoint Space: xxxxx0 | |
| 19 | * This pool includes DSCP values ending in '0' (binary), allocated via | |
| 20 | * Standards Action. It is intended for globally recognized traffic classes, | |
| 21 | * ensuring interoperability across the internet. This pool encompasses | |
| 22 | * well-known DSCP values such as CS0-CS7, AFxx, EF, and VOICE-ADMIT. | |
| 23 | * | |
| 24 | * Pool 2 (Experimental/Local Use Pool): | |
| 25 | * - Codepoint Space: xxxx11 | |
| 26 | * Reserved for DSCP values ending in '11' (binary), this pool is designated | |
| 27 | * for Experimental or Local Use. It allows for private or temporary traffic | |
| 28 | * marking schemes not intended for standardized global use, facilitating | |
| 29 | * testing and network-specific configurations without impacting | |
| 30 | * interoperability. | |
| 31 | * | |
| 32 | * Pool 3 (Preferential Standardization Pool): | |
| 33 | * - Codepoint Space: xxxx01 | |
| 34 | * Initially reserved for experimental or local use, this pool now serves as | |
| 35 | * a secondary standardization resource should Pool 1 become exhausted. DSCP | |
| 36 | * values ending in '01' (binary) are assigned via Standards Action, with a | |
| 37 | * focus on adopting new, standardized traffic classes as the need arises. | |
| 38 | * | |
| 39 | * For pool updates see: | |
| 40 | * https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml | |
| 41 | */ | |
| 42 | ||
| 43 | /* Pool 1: Standardized DSCP values as per [RFC8126] */ | |
| 44 | #define DSCP_CS0 0 /* 000000, [RFC2474] */ | |
| 45 | /* CS0 is some times called default (DF) */ | |
| 46 | #define DSCP_DF 0 /* 000000, [RFC2474] */ | |
| 47 | #define DSCP_CS1 8 /* 001000, [RFC2474] */ | |
| 48 | #define DSCP_CS2 16 /* 010000, [RFC2474] */ | |
| 49 | #define DSCP_CS3 24 /* 011000, [RFC2474] */ | |
| 50 | #define DSCP_CS4 32 /* 100000, [RFC2474] */ | |
| 51 | #define DSCP_CS5 40 /* 101000, [RFC2474] */ | |
| 52 | #define DSCP_CS6 48 /* 110000, [RFC2474] */ | |
| 53 | #define DSCP_CS7 56 /* 111000, [RFC2474] */ | |
| 54 | #define DSCP_AF11 10 /* 001010, [RFC2597] */ | |
| 55 | #define DSCP_AF12 12 /* 001100, [RFC2597] */ | |
| 56 | #define DSCP_AF13 14 /* 001110, [RFC2597] */ | |
| 57 | #define DSCP_AF21 18 /* 010010, [RFC2597] */ | |
| 58 | #define DSCP_AF22 20 /* 010100, [RFC2597] */ | |
| 59 | #define DSCP_AF23 22 /* 010110, [RFC2597] */ | |
| 60 | #define DSCP_AF31 26 /* 011010, [RFC2597] */ | |
| 61 | #define DSCP_AF32 28 /* 011100, [RFC2597] */ | |
| 62 | #define DSCP_AF33 30 /* 011110, [RFC2597] */ | |
| 63 | #define DSCP_AF41 34 /* 100010, [RFC2597] */ | |
| 64 | #define DSCP_AF42 36 /* 100100, [RFC2597] */ | |
| 65 | #define DSCP_AF43 38 /* 100110, [RFC2597] */ | |
| 66 | #define DSCP_EF 46 /* 101110, [RFC3246] */ | |
| 67 | #define DSCP_VOICE_ADMIT 44 /* 101100, [RFC5865] */ | |
| 68 | ||
| 69 | /* Pool 3: Standardized assignments, previously available for experimental/local | |
| 70 | * use | |
| 71 | */ | |
| 72 | #define DSCP_LE 1 /* 000001, [RFC8622] */ | |
| 73 | ||
| 74 | #define DSCP_MAX 64 | |
| 75 | ||
| 76 | #endif /* __DSCP_H__ */ |