1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (c) 2024 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> */ 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__ */ 77