Struct TcpLayer 

pub struct TcpLayer {
    pub index: LayerIndex,
}

A view into a TCP packet header.

Fields

index: LayerIndex

Implementations

impl TcpLayer

pub const fn new(start: usize, end: usize) -> Self

Create a new TCP layer view with specified bounds.

pub const fn at_start() -> Self

Create a layer at offset 0 with minimum header length.

pub const fn at_offset(offset: usize) -> Self

Create a layer at the specified offset with minimum header length.

pub fn at_offset_dynamic(buf: &[u8], offset: usize) -> Result<Self, FieldError>

Create a layer at offset, calculating actual header length from data offset.

pub fn validate(buf: &[u8], offset: usize) -> Result<(), FieldError>

Validate that the buffer contains a valid TCP header at the offset.

pub fn calculate_header_len(&self, buf: &[u8]) -> usize

Calculate the actual header length from the buffer.

pub fn options_len(&self, buf: &[u8]) -> usize

Get the options length (header length - 20).

pub fn src_port(&self, buf: &[u8]) -> Result<u16, FieldError>

Read the source port.

pub fn sport(&self, buf: &[u8]) -> Result<u16, FieldError>

Alias for src_port (Scapy compatibility).

pub fn dst_port(&self, buf: &[u8]) -> Result<u16, FieldError>

Read the destination port.

pub fn dport(&self, buf: &[u8]) -> Result<u16, FieldError>

Alias for dst_port (Scapy compatibility).

pub fn seq(&self, buf: &[u8]) -> Result<u32, FieldError>

Read the sequence number.

pub fn ack(&self, buf: &[u8]) -> Result<u32, FieldError>

Read the acknowledgment number.

pub fn data_offset(&self, buf: &[u8]) -> Result<u8, FieldError>

Read the data offset (in 32-bit words).

pub fn dataofs(&self, buf: &[u8]) -> Result<u8, FieldError>

Alias for data_offset (Scapy compatibility).

pub fn reserved(&self, buf: &[u8]) -> Result<u8, FieldError>

Read the reserved bits (should be 0).

pub fn flags_raw(&self, buf: &[u8]) -> Result<u8, FieldError>

Read the flags as raw byte.

pub fn flags(&self, buf: &[u8]) -> Result<TcpFlags, FieldError>

Read the flags as a structured type.

pub fn window(&self, buf: &[u8]) -> Result<u16, FieldError>

Read the window size.

pub fn checksum(&self, buf: &[u8]) -> Result<u16, FieldError>

Read the checksum.

pub fn chksum(&self, buf: &[u8]) -> Result<u16, FieldError>

Alias for checksum (Scapy compatibility).

pub fn urgent_ptr(&self, buf: &[u8]) -> Result<u16, FieldError>

Read the urgent pointer.

pub fn urgptr(&self, buf: &[u8]) -> Result<u16, FieldError>

Alias for urgent_ptr (Scapy compatibility).

pub fn options_bytes<'a>(&self, buf: &'a [u8]) -> Result<&'a [u8], FieldError>

Read the options bytes (if any).

pub fn options(&self, buf: &[u8]) -> Result<TcpOptions, FieldError>

Parse and return the options.

pub fn set_src_port(&self, buf: &mut [u8], port: u16) -> Result<(), FieldError>

Set the source port.

pub fn set_sport(&self, buf: &mut [u8], port: u16) -> Result<(), FieldError>

Alias for set_src_port (Scapy compatibility).

pub fn set_dst_port(&self, buf: &mut [u8], port: u16) -> Result<(), FieldError>

Set the destination port.

pub fn set_dport(&self, buf: &mut [u8], port: u16) -> Result<(), FieldError>

Alias for set_dst_port (Scapy compatibility).

pub fn set_seq(&self, buf: &mut [u8], seq: u32) -> Result<(), FieldError>

Set the sequence number.

pub fn set_ack(&self, buf: &mut [u8], ack: u32) -> Result<(), FieldError>

Set the acknowledgment number.

pub fn set_data_offset( &self, buf: &mut [u8], offset: u8, ) -> Result<(), FieldError>

Set the data offset (in 32-bit words).

pub fn set_dataofs(&self, buf: &mut [u8], offset: u8) -> Result<(), FieldError>

Alias for set_data_offset (Scapy compatibility).

pub fn set_reserved( &self, buf: &mut [u8], reserved: u8, ) -> Result<(), FieldError>

Set the reserved bits.

pub fn set_flags_raw(&self, buf: &mut [u8], flags: u8) -> Result<(), FieldError>

Set the flags from raw byte.

pub fn set_flags( &self, buf: &mut [u8], flags: TcpFlags, ) -> Result<(), FieldError>

Set the flags from structured type.

pub fn set_window(&self, buf: &mut [u8], window: u16) -> Result<(), FieldError>

Set the window size.

pub fn set_checksum( &self, buf: &mut [u8], checksum: u16, ) -> Result<(), FieldError>

Set the checksum.

pub fn set_chksum( &self, buf: &mut [u8], checksum: u16, ) -> Result<(), FieldError>

Alias for set_checksum (Scapy compatibility).

pub fn set_urgent_ptr( &self, buf: &mut [u8], urgptr: u16, ) -> Result<(), FieldError>

Set the urgent pointer.

pub fn set_urgptr(&self, buf: &mut [u8], urgptr: u16) -> Result<(), FieldError>

Alias for set_urgent_ptr (Scapy compatibility).

pub fn get_field( &self, buf: &[u8], name: &str, ) -> Option<Result<FieldValue, FieldError>>

Get a field value by name.

pub fn set_field( &self, buf: &mut [u8], name: &str, value: FieldValue, ) -> Option<Result<(), FieldError>>

Set a field value by name.

pub fn field_names() -> &'static [&'static str]

Get list of field names.

pub fn payload_len(&self, buf: &[u8], ip_payload_len: usize) -> usize

Get the payload length from IP total length. Note: TCP doesn’t have its own length field; it relies on IP layer.

pub fn payload<'a>(&self, buf: &'a [u8]) -> &'a [u8]

Get a slice of the payload data.

pub fn header_bytes<'a>(&self, buf: &'a [u8]) -> &'a [u8]

Get the header bytes.

pub fn src_service(&self, buf: &[u8]) -> &'static str

Get the source port service name.

pub fn dst_service(&self, buf: &[u8]) -> &'static str

Get the destination port service name.

pub fn hashret(&self, buf: &[u8]) -> Vec<u8>

Compute hash for packet matching (like Scapy’s hashret).

pub fn answers(&self, buf: &[u8], other: &TcpLayer, other_buf: &[u8]) -> bool

Check if this packet answers another (for sr() matching).

Trait Implementations

impl Clone for TcpLayer

fn clone(&self) -> TcpLayer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TcpLayer

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

Formats the value using the given formatter.

impl Layer for TcpLayer

fn kind(&self) -> LayerKind

Get the kind of this layer

fn summary(&self, buf: &[u8]) -> String

Get a human-readable summary of this layer

fn header_len(&self, buf: &[u8]) -> usize

Get the header length for this layer

fn hashret(&self, buf: &[u8]) -> Vec<u8>

Compute a hash for packet matching.

fn answers(&self, buf: &[u8], other: &Self, other_buf: &[u8]) -> bool

Check if this packet answers another packet.

fn field_names(&self) -> &'static [&'static str]

Get the list of field names for this layer

fn extract_padding<'a>(&self, data: &'a [u8]) -> (&'a [u8], &'a [u8])

Extract padding from the packet.