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use crate::err::ip::IpDscpUnknownValueError;
use super::IpDscp;
/// Known "Differentiated Services Field Codepoints" (DSCP) values according to
/// the [IANA registry](https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml)
/// (exported on 2025-04-24).
///
/// DSCP was established in
/// [RFC-2472](https://datatracker.ietf.org/doc/html/rfc2474) and defined/maintained in the
/// [IANA dscp-registry](https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml)
#[derive(Copy, Debug, Clone, Eq, PartialEq, PartialOrd, Ord, Hash)]
pub enum IpDscpKnown {
/// Class Selector 0 (Pool 1) [RFC-2474](https://datatracker.ietf.org/doc/html/rfc2474)
ClassSelector0 = 0b0000_0000,
/// Class Selector 1 (Pool 1) [RFC-2474](https://datatracker.ietf.org/doc/html/rfc2474)
ClassSelector1 = 0b0000_1000,
/// Class Selector 2 (Pool 1) [RFC-2474](https://datatracker.ietf.org/doc/html/rfc2474)
ClassSelector2 = 0b0001_0000,
/// Class Selector 3 (Pool 1) [RFC-2474](https://datatracker.ietf.org/doc/html/rfc2474)
ClassSelector3 = 0b0001_1000,
/// Class Selector 4 (Pool 1) [RFC-2474](https://datatracker.ietf.org/doc/html/rfc2474)
ClassSelector4 = 0b0010_0000,
/// Class Selector 5 (Pool 1) [RFC-2474](https://datatracker.ietf.org/doc/html/rfc2474)
ClassSelector5 = 0b0010_1000,
/// Class Selector 6 (Pool 1) [RFC-2474](https://datatracker.ietf.org/doc/html/rfc2474)
ClassSelector6 = 0b0011_0000,
/// Class Selector 7 (Pool 1) [RFC-2474](https://datatracker.ietf.org/doc/html/rfc2474)
ClassSelector7 = 0b0011_1000,
/// Assured Forwarding PHB Group 11 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup11 = 0b0000_1010,
/// Assured Forwarding PHB Group 12 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup12 = 0b0000_1100,
/// Assured Forwarding PHB Group 13 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup13 = 0b0000_1110,
/// Assured Forwarding PHB Group 21 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup21 = 0b0001_0010,
/// Assured Forwarding PHB Group 22 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup22 = 0b0001_0100,
/// Assured Forwarding PHB Group 23 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup23 = 0b0001_0110,
/// Assured Forwarding PHB Group 31 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup31 = 0b0001_1010,
/// Assured Forwarding PHB Group 32 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup32 = 0b0001_1100,
/// Assured Forwarding PHB Group 33 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup33 = 0b0001_1110,
/// Assured Forwarding PHB Group 41 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup41 = 0b0010_0010,
/// Assured Forwarding PHB Group 42 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup42 = 0b0010_0100,
/// Assured Forwarding PHB Group 43 (Pool 1) [RFC-2597](https://datatracker.ietf.org/doc/html/rfc2597)
AfGroup43 = 0b0010_0110,
/// Expedited Forwarding (Pool 1) [RFC-3246](https://datatracker.ietf.org/doc/html/rfc3246)
ExpeditedForwarding = 0b_0010_1110,
/// Voice admit (Pool 1) [RFC-5865](https://datatracker.ietf.org/doc/html/rfc5865)
VoiceAdmit = 0b0010_1100,
/// Lower Effort PHB (Pool 3) [RFC-8622](https://datatracker.ietf.org/doc/html/rfc8622)
LowerEffort = 0b0000_0001,
// NOTE: NQB was omitted here because it has an expiration in the IANA registry.
}
impl IpDscpKnown {
/// Try converting an [`IpDscp`] into a [`IpDscpKnown`] value.
///
/// Returns an error if the value is not a known DSCP value.
pub const fn try_from_ip_dscp(value: IpDscp) -> Result<IpDscpKnown, IpDscpUnknownValueError> {
match value {
IpDscp::CS0 => Ok(IpDscpKnown::ClassSelector0),
IpDscp::CS1 => Ok(IpDscpKnown::ClassSelector1),
IpDscp::CS2 => Ok(IpDscpKnown::ClassSelector2),
IpDscp::CS3 => Ok(IpDscpKnown::ClassSelector3),
IpDscp::CS4 => Ok(IpDscpKnown::ClassSelector4),
IpDscp::CS5 => Ok(IpDscpKnown::ClassSelector5),
IpDscp::CS6 => Ok(IpDscpKnown::ClassSelector6),
IpDscp::CS7 => Ok(IpDscpKnown::ClassSelector7),
IpDscp::AF11 => Ok(IpDscpKnown::AfGroup11),
IpDscp::AF12 => Ok(IpDscpKnown::AfGroup12),
IpDscp::AF13 => Ok(IpDscpKnown::AfGroup13),
IpDscp::AF21 => Ok(IpDscpKnown::AfGroup21),
IpDscp::AF22 => Ok(IpDscpKnown::AfGroup22),
IpDscp::AF23 => Ok(IpDscpKnown::AfGroup23),
IpDscp::AF31 => Ok(IpDscpKnown::AfGroup31),
IpDscp::AF32 => Ok(IpDscpKnown::AfGroup32),
IpDscp::AF33 => Ok(IpDscpKnown::AfGroup33),
IpDscp::AF41 => Ok(IpDscpKnown::AfGroup41),
IpDscp::AF42 => Ok(IpDscpKnown::AfGroup42),
IpDscp::AF43 => Ok(IpDscpKnown::AfGroup43),
IpDscp::EF => Ok(IpDscpKnown::ExpeditedForwarding),
IpDscp::VOICE_ADMIT => Ok(IpDscpKnown::VoiceAdmit),
IpDscp::LOWER_EFFORT => Ok(IpDscpKnown::LowerEffort),
value => Err(IpDscpUnknownValueError {
value: value.value(),
}),
}
}
}
impl TryFrom<IpDscp> for IpDscpKnown {
type Error = crate::err::ip::IpDscpUnknownValueError;
fn try_from(value: IpDscp) -> Result<Self, Self::Error> {
Self::try_from_ip_dscp(value)
}
}
impl From<IpDscpKnown> for u8 {
fn from(value: IpDscpKnown) -> Self {
value as u8
}
}
impl From<IpDscpKnown> for IpDscp {
fn from(value: IpDscpKnown) -> Self {
// SAFE: As all IpDscpKnown values are bellow the maximum
// value of IpDscp::MAX_U8.
unsafe { IpDscp::new_unchecked(value as u8) }
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{err::ip::IpDscpUnknownValueError, IpDscp};
#[test]
fn try_from_ip_dscp() {
// ok value conversions
{
use IpDscpKnown::*;
let tests = [
(ClassSelector0, 0b0000_0000u8),
(ClassSelector1, 0b0000_1000u8),
(ClassSelector2, 0b0001_0000u8),
(ClassSelector3, 0b0001_1000u8),
(ClassSelector4, 0b0010_0000u8),
(ClassSelector5, 0b0010_1000u8),
(ClassSelector6, 0b0011_0000u8),
(ClassSelector7, 0b0011_1000u8),
(AfGroup11, 0b0000_1010u8),
(AfGroup12, 0b0000_1100u8),
(AfGroup13, 0b0000_1110u8),
(AfGroup21, 0b0001_0010u8),
(AfGroup22, 0b0001_0100u8),
(AfGroup23, 0b0001_0110u8),
(AfGroup31, 0b0001_1010u8),
(AfGroup32, 0b0001_1100u8),
(AfGroup33, 0b0001_1110u8),
(AfGroup41, 0b0010_0010u8),
(AfGroup42, 0b0010_0100u8),
(AfGroup43, 0b0010_0110u8),
(ExpeditedForwarding, 0b_0010_1110u8),
(VoiceAdmit, 0b0010_1100u8),
(LowerEffort, 0b0000_0001u8),
];
for (expected, value) in tests {
let ip_dscp = IpDscp::try_new(value).unwrap();
assert_eq!(Ok(expected), IpDscpKnown::try_from_ip_dscp(ip_dscp));
assert_eq!(Ok(expected), IpDscpKnown::try_from(ip_dscp));
}
}
// unknown conversions (experimental range)
{
// defined based on IANA registry
let unknown_ranges = [
2..=7u8,
9..=9u8,
11..=11u8,
13..=13u8,
15..=15u8,
17..=17u8,
19..=19u8,
21..=21u8,
23..=23u8,
25..=25u8,
27..=27u8,
29..=29u8,
31..=31u8,
33..=33u8,
35..=35u8,
37..=37u8,
39..=39u8,
41..=43u8,
45..=45u8,
47..=47u8,
49..=55u8,
57..=0b0011_1111u8,
];
for range in unknown_ranges {
for value in range {
let ip_dscp = IpDscp::try_new(value).unwrap();
assert_eq!(
Err(IpDscpUnknownValueError { value }),
IpDscpKnown::try_from_ip_dscp(ip_dscp)
);
assert_eq!(
Err(IpDscpUnknownValueError { value }),
IpDscpKnown::try_from(ip_dscp)
);
}
}
}
}
#[test]
fn into_u8_and_ip_dscp() {
use IpDscpKnown::*;
let tests = [
(ClassSelector0, 0b0000_0000u8),
(ClassSelector1, 0b0000_1000u8),
(ClassSelector2, 0b0001_0000u8),
(ClassSelector3, 0b0001_1000u8),
(ClassSelector4, 0b0010_0000u8),
(ClassSelector5, 0b0010_1000u8),
(ClassSelector6, 0b0011_0000u8),
(ClassSelector7, 0b0011_1000u8),
(AfGroup11, 0b0000_1010u8),
(AfGroup12, 0b0000_1100u8),
(AfGroup13, 0b0000_1110u8),
(AfGroup21, 0b0001_0010u8),
(AfGroup22, 0b0001_0100u8),
(AfGroup23, 0b0001_0110u8),
(AfGroup31, 0b0001_1010u8),
(AfGroup32, 0b0001_1100u8),
(AfGroup33, 0b0001_1110u8),
(AfGroup41, 0b0010_0010u8),
(AfGroup42, 0b0010_0100u8),
(AfGroup43, 0b0010_0110u8),
(ExpeditedForwarding, 0b_0010_1110u8),
(VoiceAdmit, 0b0010_1100u8),
(LowerEffort, 0b0000_0001u8),
];
for (input, expected) in tests {
assert_eq!(expected, u8::from(input));
assert_eq!(IpDscp::try_new(expected).unwrap(), IpDscp::from(input));
}
}
}