Struct Nat64Prefix 

pub struct Nat64Prefix { /* private fields */ }

Operator-declared, network-specific RFC 6052 NAT64 prefixes, and the parser that turns the configured strings into them.

Public because the tools that hold a prefix list name the type in their constructor signatures. Malformed input rejects the whole list, so a tool that cannot parse its configuration fails construction rather than running with a silently narrowed egress boundary. One operator-declared, network-specific NAT64 prefix.

Construct with Nat64Prefix::parse (or parse_nat64_prefixes for a whole configured list); there is no other constructor, so a value of this type is always one of the six RFC 6052 §2.2 prefix lengths with no bits set beyond that length.

Implementations

impl Nat64Prefix

pub fn parse(raw: &str) -> Result<Nat64Prefix, Error>

Parse one <ipv6>/<len> entry, for example "2001:db8:122:344::/96".

Errors

Returns an error describing the problem when the entry has no /, does not parse as an IPv6 address, uses a prefix length outside RFC 6052 §2.2’s /32, /40, /48, /56, /64, /96, or sets any bit beyond the prefix length.

pub const fn prefix_len(&self) -> u8

The prefix length in bits.

pub const fn network(&self) -> Ipv6Addr

The prefix network address, with all bits beyond Self::prefix_len zero.

pub fn embedded_ipv4(&self, v6: Ipv6Addr) -> Option<Ipv4Addr>

Decode the IPv4 address v6 embeds under this prefix, or None when v6 is not inside the prefix.

The layouts are RFC 6052 §2.2’s: the embedded IPv4 octets follow the prefix and skip octet 8, the “u” octet, for every length below /96.

The u-octet is decoded regardless of its value

RFC 6052 requires a translator to set octet 8 to zero, and §3.1 says an address whose u-octet is non-zero is not a valid IPv4-embedded address. This decoder deliberately ignores that rule, because here the address comes from a DNS answer the attacker writes, not from a translator. Requiring u == 0 would classify <prefix>:ff:a:0:100::-style answers as opaque IPv6 while a permissive translator still delivered them to the embedded IPv4 destination — a bypass. Decoding unconditionally can only over-approximate what the translator reaches, which is the safe direction for a deny boundary.

Trait Implementations

impl Clone for Nat64Prefix

fn clone(&self) -> Nat64Prefix

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Nat64Prefix

impl Debug for Nat64Prefix

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Display for Nat64Prefix

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Eq for Nat64Prefix

impl Hash for Nat64Prefix

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Nat64Prefix

fn cmp(&self, other: &Nat64Prefix) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Nat64Prefix

fn eq(&self, other: &Nat64Prefix) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Nat64Prefix

fn partial_cmp(&self, other: &Nat64Prefix) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Nat64Prefix