diff options
Diffstat (limited to 'library/std/src')
| -rw-r--r-- | library/std/src/net/ip.rs | 110 | ||||
| -rw-r--r-- | library/std/src/net/ip/tests.rs | 18 |
2 files changed, 27 insertions, 101 deletions
diff --git a/library/std/src/net/ip.rs b/library/std/src/net/ip.rs index a8261709cea..6c2f2eeabd6 100644 --- a/library/std/src/net/ip.rs +++ b/library/std/src/net/ip.rs @@ -1267,79 +1267,31 @@ impl Ipv6Addr { (self.segments()[0] & 0xfe00) == 0xfc00 } - /// Returns [`true`] if the address is a unicast link-local address (`fe80::/64`). + /// Returns `true` if the address is a unicast address with link-local scope, + /// as defined in [RFC 4291]. /// - /// A common misconception is to think that "unicast link-local addresses start with - /// `fe80::`", but [IETF RFC 4291] actually defines a stricter format for these addresses: + /// A unicast address has link-local scope if it has the prefix `fe80::/10`, as per [RFC 4291 section 2.4]. + /// Note that this encompasses more addresses than those defined in [RFC 4291 section 2.5.6], + /// which describes "Link-Local IPv6 Unicast Addresses" as having the following stricter format: /// - /// ```no_rust - /// | 10 | - /// | bits | 54 bits | 64 bits | + /// ```text + /// | 10 bits | 54 bits | 64 bits | /// +----------+-------------------------+----------------------------+ /// |1111111010| 0 | interface ID | /// +----------+-------------------------+----------------------------+ /// ``` + /// So while currently the only addresses with link-local scope an application will encounter are all in `fe80::/64`, + /// this might change in the future with the publication of new standards. More addresses in `fe80::/10` could be allocated, + /// and those addresses will have link-local scope. /// - /// This method validates the format defined in the RFC and won't recognize addresses - /// like `fe80:0:0:1::` or `fe81::` as unicast link-local addresses. - /// If you need a less strict validation, use [`Ipv6Addr::is_unicast_link_local()`] instead. - /// - /// # Examples - /// - /// ``` - /// #![feature(ip)] - /// - /// use std::net::Ipv6Addr; - /// - /// let ip = Ipv6Addr::new(0xfe80, 0, 0, 0, 0, 0, 0, 0); - /// assert!(ip.is_unicast_link_local_strict()); - /// - /// let ip = Ipv6Addr::new(0xfe80, 0, 0, 0, 0xffff, 0xffff, 0xffff, 0xffff); - /// assert!(ip.is_unicast_link_local_strict()); - /// - /// let ip = Ipv6Addr::new(0xfe80, 0, 0, 1, 0, 0, 0, 0); - /// assert!(!ip.is_unicast_link_local_strict()); - /// assert!(ip.is_unicast_link_local()); - /// - /// let ip = Ipv6Addr::new(0xfe81, 0, 0, 0, 0, 0, 0, 0); - /// assert!(!ip.is_unicast_link_local_strict()); - /// assert!(ip.is_unicast_link_local()); - /// ``` - /// - /// # See also - /// - /// - [IETF RFC 4291 section 2.5.6] - /// - [RFC 4291 errata 4406] (which has been rejected but provides useful - /// insight) - /// - [`Ipv6Addr::is_unicast_link_local()`] - /// - /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291 - /// [IETF RFC 4291 section 2.5.6]: https://tools.ietf.org/html/rfc4291#section-2.5.6 - /// [RFC 4291 errata 4406]: https://www.rfc-editor.org/errata/eid4406 - #[rustc_const_unstable(feature = "const_ipv6", issue = "76205")] - #[unstable(feature = "ip", issue = "27709")] - #[inline] - pub const fn is_unicast_link_local_strict(&self) -> bool { - matches!(self.segments(), [0xfe80, 0, 0, 0, ..]) - } - - /// Returns [`true`] if the address is a unicast link-local address (`fe80::/10`). + /// Also note that while [RFC 4291 section 2.5.3] mentions about the [loopback address] (`::1`) that "it is treated as having Link-Local scope", + /// this does not mean that the loopback address actually has link-local scope and this method will return `false` on it. /// - /// This method returns [`true`] for addresses in the range reserved by [RFC 4291 section 2.4], - /// i.e. addresses with the following format: - /// - /// ```no_rust - /// | 10 | - /// | bits | 54 bits | 64 bits | - /// +----------+-------------------------+----------------------------+ - /// |1111111010| arbitratry value | interface ID | - /// +----------+-------------------------+----------------------------+ - /// ``` - /// - /// As a result, this method considers addresses such as `fe80:0:0:1::` or `fe81::` to be - /// unicast link-local addresses, whereas [`Ipv6Addr::is_unicast_link_local_strict()`] does not. - /// If you need a strict validation fully compliant with the RFC, use - /// [`Ipv6Addr::is_unicast_link_local_strict()`] instead. + /// [RFC 4291]: https://tools.ietf.org/html/rfc4291 + /// [RFC 4291 section 2.4]: https://tools.ietf.org/html/rfc4291#section-2.4 + /// [RFC 4291 section 2.5.3]: https://tools.ietf.org/html/rfc4291#section-2.5.3 + /// [RFC 4291 section 2.5.6]: https://tools.ietf.org/html/rfc4291#section-2.5.6 + /// [loopback address]: Ipv6Addr::LOCALHOST /// /// # Examples /// @@ -1348,29 +1300,17 @@ impl Ipv6Addr { /// /// use std::net::Ipv6Addr; /// - /// let ip = Ipv6Addr::new(0xfe80, 0, 0, 0, 0, 0, 0, 0); - /// assert!(ip.is_unicast_link_local()); + /// // The loopback address (`::1`) does not actually have link-local scope. + /// assert_eq!(Ipv6Addr::LOCALHOST.is_unicast_link_local(), false); /// - /// let ip = Ipv6Addr::new(0xfe80, 0, 0, 0, 0xffff, 0xffff, 0xffff, 0xffff); - /// assert!(ip.is_unicast_link_local()); + /// // Only addresses in `fe80::/10` have link-local scope. + /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), false); + /// assert_eq!(Ipv6Addr::new(0xfe80, 0, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), true); /// - /// let ip = Ipv6Addr::new(0xfe80, 0, 0, 1, 0, 0, 0, 0); - /// assert!(ip.is_unicast_link_local()); - /// assert!(!ip.is_unicast_link_local_strict()); - /// - /// let ip = Ipv6Addr::new(0xfe81, 0, 0, 0, 0, 0, 0, 0); - /// assert!(ip.is_unicast_link_local()); - /// assert!(!ip.is_unicast_link_local_strict()); + /// // Addresses outside the stricter `fe80::/64` also have link-local scope. + /// assert_eq!(Ipv6Addr::new(0xfe80, 0, 0, 1, 0, 0, 0, 0).is_unicast_link_local(), true); + /// assert_eq!(Ipv6Addr::new(0xfe81, 0, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), true); /// ``` - /// - /// # See also - /// - /// - [IETF RFC 4291 section 2.4] - /// - [RFC 4291 errata 4406] (which has been rejected but provides useful - /// insight) - /// - /// [IETF RFC 4291 section 2.4]: https://tools.ietf.org/html/rfc4291#section-2.4 - /// [RFC 4291 errata 4406]: https://www.rfc-editor.org/errata/eid4406 #[rustc_const_unstable(feature = "const_ipv6", issue = "76205")] #[unstable(feature = "ip", issue = "27709")] #[inline] diff --git a/library/std/src/net/ip/tests.rs b/library/std/src/net/ip/tests.rs index ef0d4edc434..05f8dea0b7c 100644 --- a/library/std/src/net/ip/tests.rs +++ b/library/std/src/net/ip/tests.rs @@ -480,7 +480,6 @@ fn ipv6_properties() { let unique_local: u16 = 1 << 2; let global: u16 = 1 << 3; let unicast_link_local: u16 = 1 << 4; - let unicast_link_local_strict: u16 = 1 << 5; let unicast_site_local: u16 = 1 << 6; let unicast_global: u16 = 1 << 7; let documentation: u16 = 1 << 8; @@ -524,11 +523,6 @@ fn ipv6_properties() { } else { assert!(!ip!($s).is_unicast_link_local()); } - if ($mask & unicast_link_local_strict) == unicast_link_local_strict { - assert!(ip!($s).is_unicast_link_local_strict()); - } else { - assert!(!ip!($s).is_unicast_link_local_strict()); - } if ($mask & unicast_site_local) == unicast_site_local { assert!(ip!($s).is_unicast_site_local()); } else { @@ -587,7 +581,6 @@ fn ipv6_properties() { let unique_local: u16 = 1 << 2; let global: u16 = 1 << 3; let unicast_link_local: u16 = 1 << 4; - let unicast_link_local_strict: u16 = 1 << 5; let unicast_site_local: u16 = 1 << 6; let unicast_global: u16 = 1 << 7; let documentation: u16 = 1 << 8; @@ -621,11 +614,7 @@ fn ipv6_properties() { unicast_link_local ); - check!( - "fe80::", - &[0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], - unicast_link_local | unicast_link_local_strict - ); + check!("fe80::", &[0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], unicast_link_local); check!( "febf:ffff::", @@ -650,7 +639,7 @@ fn ipv6_properties() { 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff ], - unicast_link_local | unicast_link_local_strict + unicast_link_local ); check!( @@ -897,9 +886,6 @@ fn ipv6_const() { const IS_UNIQUE_LOCAL: bool = IP_ADDRESS.is_unique_local(); assert!(!IS_UNIQUE_LOCAL); - const IS_UNICAST_LINK_LOCAL_STRICT: bool = IP_ADDRESS.is_unicast_link_local_strict(); - assert!(!IS_UNICAST_LINK_LOCAL_STRICT); - const IS_UNICAST_LINK_LOCAL: bool = IP_ADDRESS.is_unicast_link_local(); assert!(!IS_UNICAST_LINK_LOCAL); |