include/net/dscp.h

   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__ */