Struct Ipv4Layer 

pub struct Ipv4Layer {
    pub index: LayerIndex,
}

A view into an IPv4 packet header.

Fields

index: LayerIndex

Implementations

impl Ipv4Layer

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

Create a new IPv4 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 IHL.

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

Validate that the buffer contains a valid IPv4 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 version(&self, buf: &[u8]) -> Result<u8, FieldError>

Read the version field (should be 4).

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

Read the Internet Header Length (in 32-bit words).

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

Read the header length in bytes.

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

Read the Type of Service (TOS) field.

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

Read the DSCP (Differentiated Services Code Point).

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

Read the ECN (Explicit Congestion Notification).

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

Read the total length field.

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

Read the identification field.

pub fn flags(&self, buf: &[u8]) -> Result<Ipv4Flags, FieldError>

Read the flags as a structured type.

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

Read the raw flags byte (upper 3 bits of flags/frag field).

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

Read the fragment offset (in 8-byte units).

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

Read the fragment offset in bytes.

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

Read the Time to Live field.

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

Read the protocol field.

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

Read the header checksum.

pub fn src(&self, buf: &[u8]) -> Result<Ipv4Addr, FieldError>

Read the source IP address.

pub fn dst(&self, buf: &[u8]) -> Result<Ipv4Addr, FieldError>

Read the destination IP address.

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<Ipv4Options, FieldError>

Parse and return the options.

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

Set the version field.

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

Set the IHL field.

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

Set the TOS field.

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

Set the DSCP field.

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

Set the ECN field.

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

Set the total length field.

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

Set the identification field.

pub fn set_flags( &self, buf: &mut [u8], flags: Ipv4Flags, ) -> Result<(), FieldError>

Set the flags field.

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

Set the fragment offset (in 8-byte units).

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

Set the TTL field.

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

Set the protocol field.

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

Set the checksum field.

pub fn set_src(&self, buf: &mut [u8], src: Ipv4Addr) -> Result<(), FieldError>

Set the source IP address.

pub fn set_dst(&self, buf: &mut [u8], dst: Ipv4Addr) -> Result<(), FieldError>

Set the destination IP address.

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

Compute and set the header checksum.

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

Verify the header checksum.

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 is_fragment(&self, buf: &[u8]) -> bool

Check if this is a fragment.

pub fn is_first_fragment(&self, buf: &[u8]) -> bool

Check if this is the first fragment.

pub fn is_last_fragment(&self, buf: &[u8]) -> bool

Check if this is the last fragment.

pub fn is_dont_fragment(&self, buf: &[u8]) -> bool

Check if the Don’t Fragment flag is set.

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

Get the payload length (total_len - header_len).

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

Get a slice of the payload data.

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

Get the header bytes.

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

Copy the header bytes.

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

Get the protocol name.

pub fn next_layer(&self, buf: &[u8]) -> Option<LayerKind>

Determine the next layer kind based on protocol.

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

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

pub fn answers(&self, buf: &[u8], other: &Ipv4Layer, other_buf: &[u8]) -> bool

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

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

Extract padding from the packet. Returns (payload, padding) tuple.

pub fn route(&self, buf: &[u8]) -> Ipv4Route

Get routing information for this packet.

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

Estimate the original TTL.

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

Estimate the number of hops.

Trait Implementations

impl Clone for Ipv4Layer

fn clone(&self) -> Ipv4Layer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Ipv4Layer

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

Formats the value using the given formatter.

impl Layer for Ipv4Layer

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

Extract padding from the packet.

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

Get the list of field names for this layer