Struct OpenMessage 

pub struct OpenMessage {
    pub version: u8,
    pub my_as: u16,
    pub hold_time: u16,
    pub bgp_identifier: Ipv4Addr,
    pub capabilities: Vec<Capability>,
}

A decoded BGP OPEN message (RFC 4271 §4.2).

Fields

version: u8

BGP version (must be 4).

my_as: u16

2-byte AS from the OPEN wire format. May be AS_TRANS (23456) if the speaker’s ASN > 65535 — the true ASN is in the FourOctetAs capability.

hold_time: u16

Proposed hold time in seconds (0 = no keepalives, or >= 3).

bgp_identifier: Ipv4Addr

BGP Identifier (router ID).

capabilities: Vec<Capability>

Capabilities from optional parameters.

Implementations

impl OpenMessage

pub fn decode(buf: &mut impl Buf, body_len: usize) -> Result<Self, DecodeError>

Decode an OPEN message body from a buffer. The header must already be consumed; body_len is header.length - HEADER_LEN.

Errors

Returns a DecodeError if the body is too short, the version is unsupported, or optional parameters are malformed.

pub fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

Encode a complete OPEN message (header + body) into a buffer.

Errors

Returns an EncodeError if the optional parameters exceed 255 bytes or the total message exceeds the maximum BGP message size.

pub fn encoded_len(&self) -> usize

Total encoded size in bytes.

pub fn four_byte_as(&self) -> u32

Extract the 4-byte ASN from capabilities, if advertised. Falls back to my_as (2-byte) if no FourOctetAs capability.

Trait Implementations

impl Clone for OpenMessage

fn clone(&self) -> OpenMessage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OpenMessage

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

Formats the value using the given formatter.

impl Eq for OpenMessage

impl PartialEq for OpenMessage

fn eq(&self, other: &OpenMessage) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for OpenMessage