Struct IPv4EndpointOption 

pub struct IPv4EndpointOption<T: AsRef<[u8]>> { /* private fields */ }

Zero-copy wrapper around IPv4 Endpoint Option (12 bytes total: 4 header + 8 data).

IPv4 endpoint options convey IPv4 address, port, and transport protocol for service endpoints.

Wire format (12 bytes):

0               1               2               3
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|           Length              |     Type      |D|  Reserved   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       IPv4 Address                            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|    Reserved   |   Protocol    |             Port              |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Implementations

impl<T: AsRef<[u8]>> IPv4EndpointOption<T>

pub const LENGTH: usize = 12usize

IPv4 endpoint option wire format size in bytes (4 header + 8 data).

pub fn new_unchecked(buffer: T) -> Self

Create an IPv4EndpointOption without validation.

Parameters

• buffer - The buffer containing the 12-byte option

Safety

This does not validate buffer length. Use new_checked for validation.

pub fn new_checked(buffer: T) -> Result<Self>

Create an IPv4EndpointOption from a buffer with length validation.

Parameters

• buffer - The buffer containing the 12-byte option

Returns

• Ok(IPv4EndpointOption) if buffer is at least 12 bytes
• Err(Error) if buffer is too short

pub fn check_len(&self) -> Result<()>

Validate that the buffer is at least 12 bytes long.

Returns

• Ok(()) if buffer meets minimum length requirement
• Err(Error) if buffer is too short

pub fn header(&self) -> OptionHeader<&[u8]>

Get a view of the option header (first 4 bytes).

Returns

OptionHeader wrapper around the header bytes

pub fn ipv4_address(&self) -> [u8; 4]

Get the IPv4 address (4 bytes at offset 4-7).

Returns

The IPv4 address as a 4-byte array in network byte order

pub fn transport_protocol(&self) -> u8

Get the transport protocol (1 byte at offset 9).

Returns

Protocol value (0x06=TCP, 0x11=UDP)

pub fn check_protocol(&self) -> Result<()>

Validate the transport protocol field.

Returns

• Ok(()) if protocol is TCP (0x06) or UDP (0x11)
• Err(Error::InvalidProtocol) if protocol is unknown

pub fn port(&self) -> u16

Get the port number (2 bytes at offset 10-11, network byte order).

Returns

The port number

impl<T: AsRef<[u8]> + AsMut<[u8]>> IPv4EndpointOption<T>

pub fn set_ipv4_address(&mut self, addr: [u8; 4])

Set the IPv4 address (4 bytes at offset 4-7).

Parameters

• addr - The IPv4 address as a 4-byte array in network byte order

pub fn set_transport_protocol(&mut self, proto: u8)

Set the transport protocol (1 byte at offset 9).

Parameters

• proto - Protocol value (0x06=TCP, 0x11=UDP)

pub fn set_port(&mut self, port: u16)

Set the port number (2 bytes at offset 10-11, network byte order).

Parameters

• port - The port number

Trait Implementations

impl<T: Clone + AsRef<[u8]>> Clone for IPv4EndpointOption<T>

fn clone(&self) -> IPv4EndpointOption<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug + AsRef<[u8]>> Debug for IPv4EndpointOption<T>

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

Formats the value using the given formatter.

impl<T: Copy + AsRef<[u8]>> Copy for IPv4EndpointOption<T>