Struct LlcHdr 

#[repr(C, packed(1))]
pub struct LlcHdr {
    pub dsap: u8,
    pub ssap: u8,
    pub ctrl: [u8; 2],
}

Represents Logical Link Control according to ISO/IEC 8802-2 Definition

Fields

dsap: u8

Destination SAP address

ssap: u8

Source SAP address

ctrl: [u8; 2]

Byte array for Control field. ctrl[0] is always used. ctrl[1] is used for I-format and S-format (16-bit control fields). For U-format (8-bit control field), ctrl[1] is not part of the logical control field.

Implementations

impl LlcHdr

pub const LEN: usize = 4usize

pub fn dsap_addr(&self) -> u8

Gets the 7-bit DSAP address part.

pub fn dsap_is_individual_addr(&self) -> bool

Checks if the DSAP I/G (Individual/Group) bit is set (Individual address). true if Individual address, false if Group address.

pub fn dsap_is_group_addr(&self) -> bool

Checks if the DSAP I/G (Individual/Group) bit is set (Group address). true if Group address, false if Individual address.

pub fn set_dsap(&mut self, addr: u8, is_group: bool)

Sets the DSAP field. addr should be a 7-bit value. is_group sets the I/G bit.

pub fn ssap_address(&self) -> u8

Gets the 7-bit SSAP address part.

pub fn ssap_is_command(&self) -> bool

Checks if the SSAP C/R (Command/Response) bit is set (Command PDU). Returns true if it’s a Command PDU, false if it’s a Response PDU.

pub fn ssap_is_response(&self) -> bool

Checks if the SSAP C/R (Command/Response) bit is set (Response PDU). Returns true if it’s a Response PDU, false if it’s a Command PDU.

pub fn set_ssap(&mut self, address: u8, is_response: bool)

Sets the SSAP field. address should be a 7-bit value. is_response sets the C/R bit.

pub fn frame_type(&self) -> LlcFrameType

Determines the LLC PDU frame type based on the control field’s first byte.

pub fn is_i_format(&self) -> bool

Returns true if the control field is I-format (16 bits).

pub fn is_s_format(&self) -> bool

Returns true if the control field is S-format (16 bits).

pub fn is_u_format(&self) -> bool

Returns true if the control field is U-format (8 bits).

pub fn control_byte0(&self) -> u8

Gets the raw value of the first byte of the control field.

pub fn control_byte1(&self) -> Option<u8>

Gets the raw value of the second byte of the control field, if applicable. Returns Some(u8) for I-Frames and S-Frames, None for U-Frames or Invalid.

Trait Implementations

impl Clone for LlcHdr

fn clone(&self) -> LlcHdr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LlcHdr

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

Formats the value using the given formatter.

impl Copy for LlcHdr