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Recognise new IPv6 documentation range from IETF RFC 9637 #135741

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Recognise new IPv6 documentation range from IETF RFC 9637 #135741

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11 changes: 7 additions & 4 deletions library/core/src/net/ip_addr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1539,8 +1539,9 @@ impl Ipv6Addr {
/// // Addresses reserved for benchmarking (`2001:2::/48`)
/// assert_eq!(Ipv6Addr::new(0x2001, 2, 0, 0, 0, 0, 0, 1,).is_global(), false);
///
/// // Addresses reserved for documentation (`2001:db8::/32`)
/// // Addresses reserved for documentation (`2001:db8::/32` and `3fff::/20`)
/// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1).is_global(), false);
/// assert_eq!(Ipv6Addr::new(0x3fff, 0, 0, 0, 0, 0, 0, 0).is_global(), false);
///
/// // Unique local addresses (`fc00::/7`)
/// assert_eq!(Ipv6Addr::new(0xfc02, 0, 0, 0, 0, 0, 0, 1).is_global(), false);
Expand Down Expand Up @@ -1686,11 +1687,12 @@ impl Ipv6Addr {
}

/// Returns [`true`] if this is an address reserved for documentation
/// (`2001:db8::/32`).
/// (`2001:db8::/32` and `3fff::/20`).
///
/// This property is defined in [IETF RFC 3849].
/// This property is defined by [IETF RFC 3849] and [IETF RFC 9637].
///
/// [IETF RFC 3849]: https://tools.ietf.org/html/rfc3849
/// [IETF RFC 9637]: https://tools.ietf.org/html/rfc9637
///
/// # Examples
///
Expand All @@ -1701,12 +1703,13 @@ impl Ipv6Addr {
///
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_documentation(), false);
/// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_documentation(), true);
/// assert_eq!(Ipv6Addr::new(0x3fff, 0, 0, 0, 0, 0, 0, 0).is_documentation(), true);
/// ```
#[unstable(feature = "ip", issue = "27709")]
#[must_use]
#[inline]
pub const fn is_documentation(&self) -> bool {
(self.segments()[0] == 0x2001) && (self.segments()[1] == 0xdb8)
matches!(self.segments(), [0x2001, 0xdb8, ..] | [0x3fff, 0..=0x0fff, ..])
}

/// Returns [`true`] if this is an address reserved for benchmarking (`2001:2::/48`).
Expand Down
10 changes: 10 additions & 0 deletions library/core/tests/net/ip_addr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -332,6 +332,7 @@ fn ip_properties() {
check!("ff08::", global | multicast);
check!("ff0e::", global | multicast);
check!("2001:db8:85a3::8a2e:370:7334", doc);
check!("3fff:fff:ffff:ffff:ffff:ffff:ffff:ffff", doc);
check!("2001:2::ac32:23ff:21", benchmarking);
check!("102:304:506:708:90a:b0c:d0e:f10", global);
}
Expand Down Expand Up @@ -790,6 +791,15 @@ fn ipv6_properties() {
documentation
);

check!(
"3fff:fff:ffff:ffff:ffff:ffff:ffff:ffff",
&[
0x3f, 0xff, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff
],
documentation
);

check!(
"2001:2::ac32:23ff:21",
&[0x20, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0xac, 0x32, 0x23, 0xff, 0, 0x21],
Expand Down
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