Struct NatId 

pub struct NatId(pub u16);

NAT identifier calculated from checksum difference.

When a NAT rewrites a packet (changing IP/port), the UDP checksum changes. The NAT ID is the difference between the received and sent checksums. If the NAT ID changes between hops, NAT was detected at that hop.

Tuple Fields

0: u16

Implementations

impl NatId

pub fn from_checksums(sent_checksum: u16, received_checksum: u16) -> Self

Calculate NAT ID from sent and received UDP checksums.

NAT ID = received_checksum - sent_checksum

If NAT rewrites the packet, the checksum changes and NAT ID will be non-zero. If NAT ID differs between hops, a NAT device exists at that point.

pub fn is_natted(&self) -> bool

Check if this represents a NATted connection (non-zero ID).

pub fn value(&self) -> u16

Get the raw NAT ID value.

Trait Implementations

impl Clone for NatId

fn clone(&self) -> NatId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NatId

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

Formats the value using the given formatter.

impl Default for NatId

fn default() -> NatId

Returns the “default value” for a type.

impl Hash for NatId

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

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 PartialEq for NatId

fn eq(&self, other: &NatId) -> 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 Copy for NatId

impl Eq for NatId

impl StructuralPartialEq for NatId