Struct ArpHdr 

#[repr(C)]
pub struct ArpHdr {
    pub htype: [u8; 2],
    pub ptype: [u8; 2],
    pub hlen: u8,
    pub plen: u8,
    pub oper: [u8; 2],
    pub sha: [u8; 6],
    pub spa: [u8; 4],
    pub tha: [u8; 6],
    pub tpa: [u8; 4],
}

Represents an Address Resolution Protocol (ARP) header.

The ARP header is typically found after the Ethernet header and is used to map a network protocol address (like an IPv4 address) to a hardware address (like a MAC address).

Fields

htype: [u8; 2]

Hardware type (HTYPE): Specifies the network link protocol type. E.g., Ethernet is 1.

ptype: [u8; 2]

Protocol type (PTYPE): Specifies the internetwork protocol for which the ARP request is intended. For IPv4, this has the value 0x0800.

hlen: u8

Hardware address length (HLEN): Length in bytes of a hardware address. Ethernet addresses size is 6.

plen: u8

Protocol address length (PLEN): Length in bytes of a logical address. IPv4 addresses size is 4.

oper: [u8; 2]

Operation (OPER): Specifies the operation that the sender is performing: 1 for request, 2 for reply.

sha: [u8; 6]

Sender hardware address (SHA): The hardware address of the sender.

spa: [u8; 4]

Sender protocol address (SPA): The protocol address of the sender.

tha: [u8; 6]

Target hardware address (THA): The hardware address of the intended receiver. This field is ignored in an ARP request.

tpa: [u8; 4]

Target protocol address (TPA): The protocol address of the intended receiver.

Implementations

impl ArpHdr

pub const LEN: usize = 28usize

The size of the ARP header in bytes.

pub fn new() -> Self

Creates a new ArpHdr with all fields initialized to zero. This is an alias for ArpHdr::default().

pub fn htype(&self) -> u16

Returns the hardware type field.

pub fn set_htype(&mut self, htype: u16)

Sets the hardware type field.

Arguments

• htype - A 2-byte array representing the hardware type.

pub fn ptype(&self) -> u16

Returns the protocol type field.

pub fn set_ptype(&mut self, ptype: u16)

Sets the protocol type field.

Arguments

• ptype - A 2-byte array representing the protocol type.

pub fn hlen(&self) -> u8

Returns the hardware address length field.

pub fn set_hlen(&mut self, hlen: u8)

Sets the hardware address length field.

Arguments

• hlen - A u8 value for the hardware address length.

pub fn plen(&self) -> u8

Returns the protocol address length field.

pub fn set_plen(&mut self, plen: u8)

Sets the protocol address length field.

Arguments

• plen - A u8 value for the protocol address length.

pub fn oper(&self) -> u16

Returns the operation field.

pub fn set_oper(&mut self, oper: u16)

Sets the operation field.

Arguments

• oper - A 2-byte array representing the operation (e.g., request or reply).

pub fn sha(&self) -> [u8; 6]

Returns the sender hardware address (SHA) field.

pub fn set_sha(&mut self, hardware_address: [u8; 6])

Sets the sender hardware address (SHA) field.

Arguments

• hardware_address - A 6-byte array representing the sender’s hardware address.

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

Returns the sender protocol address (SPA) field.

pub fn set_spa(&mut self, protocol_address: [u8; 4])

Sets the sender protocol address (SPA) field.

Arguments

• protocol_address - A 4-byte array representing the sender’s protocol address.

pub fn tha(&self) -> [u8; 6]

Returns the target hardware address (THA) field.

pub fn set_tha(&mut self, hardware_address: [u8; 6])

Sets the target hardware address (THA) field.

Arguments

• hardware_address - A 6-byte array representing the target’s hardware address.

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

Returns the target protocol address (TPA) field.

pub fn set_tpa(&mut self, protocol_address: [u8; 4])

Sets the target protocol address (TPA) field.

Arguments

• protocol_address - A 4-byte array representing the target’s protocol address.

Trait Implementations

impl Clone for ArpHdr

fn clone(&self) -> ArpHdr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ArpHdr

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

Formats the value using the given formatter.

impl Default for ArpHdr

fn default() -> ArpHdr

Returns the “default value” for a type.

impl Copy for ArpHdr