712 lines
25 KiB
Rust
712 lines
25 KiB
Rust
use core::fmt;
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use byteorder::{NetworkEndian, ByteOrder};
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use bitflags::bitflags;
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use crate::{Error, Result};
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use crate::time::Duration;
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use crate::wire::{EthernetAddress, Ipv6Address, Ipv6Packet, Ipv6Repr};
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enum_with_unknown! {
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/// NDISC Option Type
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pub doc enum Type(u8) {
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/// Source Link-layer Address
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SourceLinkLayerAddr = 0x1,
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/// Target Link-layer Address
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TargetLinkLayerAddr = 0x2,
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/// Prefix Information
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PrefixInformation = 0x3,
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/// Redirected Header
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RedirectedHeader = 0x4,
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/// MTU
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Mtu = 0x5
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}
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}
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impl fmt::Display for Type {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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Type::SourceLinkLayerAddr => write!(f, "source link-layer address"),
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Type::TargetLinkLayerAddr => write!(f, "target link-layer address"),
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Type::PrefixInformation => write!(f, "prefix information"),
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Type::RedirectedHeader => write!(f, "redirected header"),
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Type::Mtu => write!(f, "mtu"),
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Type::Unknown(id) => write!(f, "{}", id)
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}
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}
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}
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bitflags! {
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pub struct PrefixInfoFlags: u8 {
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const ON_LINK = 0b10000000;
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const ADDRCONF = 0b01000000;
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}
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}
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/// A read/write wrapper around an [NDISC Option].
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///
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/// [NDISC Option]: https://tools.ietf.org/html/rfc4861#section-4.6
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#[derive(Debug, PartialEq)]
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pub struct NdiscOption<T: AsRef<[u8]>> {
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buffer: T
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}
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// Format of an NDISC Option
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//
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Type | Length | ... |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// ~ ... ~
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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//
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// See https://tools.ietf.org/html/rfc4861#section-4.6 for details.
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mod field {
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#![allow(non_snake_case)]
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use crate::wire::field::*;
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// 8-bit identifier of the type of option.
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pub const TYPE: usize = 0;
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// 8-bit unsigned integer. Length of the option, in units of 8 octests.
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pub const LENGTH: usize = 1;
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// Minimum length of an option.
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pub const MIN_OPT_LEN: usize = 8;
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// Variable-length field. Option-Type-specific data.
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pub fn DATA(length: u8) -> Field {
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2..length as usize * 8
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}
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// Source/Target Link-layer Option fields.
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Type | Length | Link-Layer Address ...
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// Link-Layer Address
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pub const LL_ADDR: Field = 2..8;
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// Prefix Information Option fields.
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Type | Length | Prefix Length |L|A| Reserved1 |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Valid Lifetime |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Preferred Lifetime |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Reserved2 |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | |
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// + +
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// | |
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// + Prefix +
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// | |
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// + +
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// | |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// Prefix length.
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pub const PREFIX_LEN: usize = 2;
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// Flags field of prefix header.
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pub const FLAGS: usize = 3;
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// Valid lifetime.
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pub const VALID_LT: Field = 4..8;
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// Preferred lifetime.
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pub const PREF_LT: Field = 8..12;
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// Reserved bits
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pub const PREF_RESERVED: Field = 12..16;
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// Prefix
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pub const PREFIX: Field = 16..32;
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// Redirected Header Option fields.
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Type | Length | Reserved |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Reserved |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | |
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// ~ IP header + data ~
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// | |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// Reserved bits.
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pub const IP_RESERVED: Field = 4..8;
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// Redirected header IP header + data.
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pub const IP_DATA: usize = 8;
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pub const REDIR_MIN_SZ: usize = 48;
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// MTU Option fields
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Type | Length | Reserved |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | MTU |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// MTU
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pub const MTU: Field = 4..8;
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}
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/// Core getter methods relevant to any type of NDISC option.
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impl<T: AsRef<[u8]>> NdiscOption<T> {
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/// Create a raw octet buffer with an NDISC Option structure.
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pub fn new_unchecked(buffer: T) -> NdiscOption<T> {
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NdiscOption { buffer }
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}
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/// Shorthand for a combination of [new_unchecked] and [check_len].
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///
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/// [new_unchecked]: #method.new_unchecked
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/// [check_len]: #method.check_len
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pub fn new_checked(buffer: T) -> Result<NdiscOption<T>> {
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let opt = Self::new_unchecked(buffer);
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opt.check_len()?;
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Ok(opt)
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}
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/// Ensure that no accessor method will panic if called.
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/// Returns `Err(Error::Truncated)` if the buffer is too short.
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///
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/// The result of this check is invalidated by calling [set_data_len].
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///
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/// [set_data_len]: #method.set_data_len
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pub fn check_len(&self) -> Result<()> {
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let data = self.buffer.as_ref();
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let len = data.len();
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if len < field::MIN_OPT_LEN {
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Err(Error::Truncated)
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} else {
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let data_range = field::DATA(data[field::LENGTH]);
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if len < data_range.end {
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Err(Error::Truncated)
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} else {
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match self.option_type() {
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Type::SourceLinkLayerAddr | Type::TargetLinkLayerAddr | Type::Mtu =>
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Ok(()),
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Type::PrefixInformation if data_range.end >= field::PREFIX.end =>
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Ok(()),
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Type::RedirectedHeader if data_range.end >= field::REDIR_MIN_SZ =>
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Ok(()),
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Type::Unknown(_) =>
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Ok(()),
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_ =>
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Err(Error::Truncated),
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}
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}
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}
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}
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/// Consume the NDISC option, returning the underlying buffer.
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pub fn into_inner(self) -> T {
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self.buffer
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}
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/// Return the option type.
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#[inline]
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pub fn option_type(&self) -> Type {
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let data = self.buffer.as_ref();
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Type::from(data[field::TYPE])
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}
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/// Return the length of the data.
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#[inline]
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pub fn data_len(&self) -> u8 {
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let data = self.buffer.as_ref();
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data[field::LENGTH]
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}
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}
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/// Getter methods only relevant for Source/Target Link-layer Address options.
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impl<T: AsRef<[u8]>> NdiscOption<T> {
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/// Return the Source/Target Link-layer Address.
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#[inline]
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pub fn link_layer_addr(&self) -> EthernetAddress {
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let data = self.buffer.as_ref();
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EthernetAddress::from_bytes(&data[field::LL_ADDR])
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}
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}
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/// Getter methods only relevant for the MTU option.
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impl<T: AsRef<[u8]>> NdiscOption<T> {
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/// Return the MTU value.
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#[inline]
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pub fn mtu(&self) -> u32 {
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let data = self.buffer.as_ref();
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NetworkEndian::read_u32(&data[field::MTU])
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}
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}
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/// Getter methods only relevant for the Prefix Information option.
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impl<T: AsRef<[u8]>> NdiscOption<T> {
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/// Return the prefix length.
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#[inline]
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pub fn prefix_len(&self) -> u8 {
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self.buffer.as_ref()[field::PREFIX_LEN]
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}
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/// Return the prefix information flags.
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#[inline]
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pub fn prefix_flags(&self) -> PrefixInfoFlags {
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PrefixInfoFlags::from_bits_truncate(self.buffer.as_ref()[field::FLAGS])
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}
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/// Return the valid lifetime of the prefix.
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#[inline]
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pub fn valid_lifetime(&self) -> Duration {
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let data = self.buffer.as_ref();
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Duration::from_secs(NetworkEndian::read_u32(&data[field::VALID_LT]) as u64)
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}
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/// Return the preferred lifetime of the prefix.
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#[inline]
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pub fn preferred_lifetime(&self) -> Duration {
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let data = self.buffer.as_ref();
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Duration::from_secs(NetworkEndian::read_u32(&data[field::PREF_LT]) as u64)
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}
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/// Return the prefix.
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#[inline]
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pub fn prefix(&self) -> Ipv6Address {
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let data = self.buffer.as_ref();
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Ipv6Address::from_bytes(&data[field::PREFIX])
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}
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}
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impl<'a, T: AsRef<[u8]> + ?Sized> NdiscOption<&'a T> {
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/// Return the option data.
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#[inline]
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pub fn data(&self) -> &'a [u8] {
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let len = self.data_len();
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let data = self.buffer.as_ref();
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&data[field::DATA(len)]
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}
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}
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/// Core setter methods relevant to any type of NDISC option.
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impl<T: AsRef<[u8]> + AsMut<[u8]>> NdiscOption<T> {
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/// Set the option type.
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#[inline]
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pub fn set_option_type(&mut self, value: Type) {
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let data = self.buffer.as_mut();
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data[field::TYPE] = value.into();
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}
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/// Set the option data length.
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#[inline]
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pub fn set_data_len(&mut self, value: u8) {
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let data = self.buffer.as_mut();
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data[field::LENGTH] = value;
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}
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}
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/// Setter methods only relevant for Source/Target Link-layer Address options.
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impl<T: AsRef<[u8]> + AsMut<[u8]>> NdiscOption<T> {
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/// Set the Source/Target Link-layer Address.
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#[inline]
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pub fn set_link_layer_addr(&mut self, addr: EthernetAddress) {
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let data = self.buffer.as_mut();
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data[field::LL_ADDR].copy_from_slice(addr.as_bytes())
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}
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}
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/// Setter methods only relevant for the MTU option.
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impl<T: AsRef<[u8]> + AsMut<[u8]>> NdiscOption<T> {
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/// Set the MTU value.
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#[inline]
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pub fn set_mtu(&mut self, value: u32) {
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let data = self.buffer.as_mut();
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NetworkEndian::write_u32(&mut data[field::MTU], value);
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}
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}
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/// Setter methods only relevant for the Prefix Information option.
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impl<T: AsRef<[u8]> + AsMut<[u8]>> NdiscOption<T> {
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/// Set the prefix length.
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#[inline]
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pub fn set_prefix_len(&mut self, value: u8) {
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self.buffer.as_mut()[field::PREFIX_LEN] = value;
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}
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/// Set the prefix information flags.
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#[inline]
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pub fn set_prefix_flags(&mut self, flags: PrefixInfoFlags) {
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self.buffer.as_mut()[field::FLAGS] = flags.bits();
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}
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/// Set the valid lifetime of the prefix.
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#[inline]
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pub fn set_valid_lifetime(&mut self, time: Duration) {
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let data = self.buffer.as_mut();
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NetworkEndian::write_u32(&mut data[field::VALID_LT], time.secs() as u32);
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}
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/// Set the preferred lifetime of the prefix.
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#[inline]
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pub fn set_preferred_lifetime(&mut self, time: Duration) {
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let data = self.buffer.as_mut();
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NetworkEndian::write_u32(&mut data[field::PREF_LT], time.secs() as u32);
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}
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/// Clear the reserved bits.
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#[inline]
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pub fn clear_prefix_reserved(&mut self) {
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let data = self.buffer.as_mut();
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NetworkEndian::write_u32(&mut data[field::PREF_RESERVED], 0);
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}
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/// Set the prefix.
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#[inline]
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pub fn set_prefix(&mut self, addr: Ipv6Address) {
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let data = self.buffer.as_mut();
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data[field::PREFIX].copy_from_slice(addr.as_bytes());
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}
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}
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/// Setter methods only relevant for the Redirected Header option.
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impl<T: AsRef<[u8]> + AsMut<[u8]>> NdiscOption<T> {
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/// Clear the reserved bits.
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#[inline]
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pub fn clear_redirected_reserved(&mut self) {
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let data = self.buffer.as_mut();
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NetworkEndian::write_u32(&mut data[field::IP_RESERVED], 0);
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}
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}
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impl<'a, T: AsRef<[u8]> + AsMut<[u8]> + ?Sized> NdiscOption<&'a mut T> {
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/// Return a mutable pointer to the option data.
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#[inline]
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pub fn data_mut(&mut self) -> &mut [u8] {
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let len = self.data_len();
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let data = self.buffer.as_mut();
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&mut data[field::DATA(len)]
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}
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}
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impl<'a, T: AsRef<[u8]> + ?Sized> fmt::Display for NdiscOption<&'a T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match Repr::parse(self) {
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Ok(repr) => write!(f, "{}", repr),
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Err(err) => {
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write!(f, "NDISC Option ({})", err)?;
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Ok(())
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}
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}
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}
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}
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
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pub struct PrefixInformation {
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pub prefix_len: u8,
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pub flags: PrefixInfoFlags,
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pub valid_lifetime: Duration,
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pub preferred_lifetime: Duration,
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pub prefix: Ipv6Address
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}
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
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pub struct RedirectedHeader<'a> {
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pub header: Ipv6Repr,
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pub data: &'a [u8]
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}
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/// A high-level representation of an NDISC Option.
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
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pub enum Repr<'a> {
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SourceLinkLayerAddr(EthernetAddress),
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TargetLinkLayerAddr(EthernetAddress),
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PrefixInformation(PrefixInformation),
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RedirectedHeader(RedirectedHeader<'a>),
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Mtu(u32),
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Unknown {
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type_: u8,
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length: u8,
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data: &'a [u8]
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},
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}
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impl<'a> Repr<'a> {
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/// Parse an NDISC Option and return a high-level representation.
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pub fn parse<T>(opt: &'a NdiscOption<&'a T>) -> Result<Repr<'a>>
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where T: AsRef<[u8]> + ?Sized {
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match opt.option_type() {
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Type::SourceLinkLayerAddr => {
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if opt.data_len() == 1 {
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Ok(Repr::SourceLinkLayerAddr(opt.link_layer_addr()))
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} else {
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Err(Error::Malformed)
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}
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},
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Type::TargetLinkLayerAddr => {
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if opt.data_len() == 1 {
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Ok(Repr::TargetLinkLayerAddr(opt.link_layer_addr()))
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} else {
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Err(Error::Malformed)
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}
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},
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Type::PrefixInformation => {
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if opt.data_len() == 4 {
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Ok(Repr::PrefixInformation(PrefixInformation {
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prefix_len: opt.prefix_len(),
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flags: opt.prefix_flags(),
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valid_lifetime: opt.valid_lifetime(),
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preferred_lifetime: opt.preferred_lifetime(),
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prefix: opt.prefix()
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}))
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} else {
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Err(Error::Malformed)
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}
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},
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Type::RedirectedHeader => {
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// If the options data length is less than 6, the option
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// does not have enough data to fill out the IP header
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// and common option fields.
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if opt.data_len() < 6 {
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Err(Error::Truncated)
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} else {
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let ip_packet = Ipv6Packet::new_unchecked(&opt.data()[field::IP_DATA..]);
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let ip_repr = Ipv6Repr::parse(&ip_packet)?;
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Ok(Repr::RedirectedHeader(RedirectedHeader {
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header: ip_repr,
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data: &opt.data()[field::IP_DATA + ip_repr.buffer_len()..]
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}))
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}
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},
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Type::Mtu => {
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if opt.data_len() == 1 {
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Ok(Repr::Mtu(opt.mtu()))
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} else {
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Err(Error::Malformed)
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}
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},
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Type::Unknown(id) => {
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Ok(Repr::Unknown {
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type_: id,
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length: opt.data_len(),
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data: opt.data()
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})
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}
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}
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}
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/// Return the length of a header that will be emitted from this high-level representation.
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pub fn buffer_len(&self) -> usize {
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match self {
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&Repr::SourceLinkLayerAddr(_) | &Repr::TargetLinkLayerAddr(_) =>
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field::LL_ADDR.end,
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&Repr::PrefixInformation(_) =>
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field::PREFIX.end,
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&Repr::RedirectedHeader(RedirectedHeader { header, data }) =>
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field::IP_DATA + header.buffer_len() + data.len(),
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&Repr::Mtu(_) =>
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field::MTU.end,
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&Repr::Unknown { length, .. } =>
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field::DATA(length).end
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}
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}
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/// Emit a high-level representation into an NDISC Option.
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pub fn emit<T>(&self, opt: &mut NdiscOption<&'a mut T>)
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where T: AsRef<[u8]> + AsMut<[u8]> + ?Sized {
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match *self {
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Repr::SourceLinkLayerAddr(addr) => {
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opt.set_option_type(Type::SourceLinkLayerAddr);
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opt.set_data_len(1);
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opt.set_link_layer_addr(addr);
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},
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Repr::TargetLinkLayerAddr(addr) => {
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opt.set_option_type(Type::TargetLinkLayerAddr);
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opt.set_data_len(1);
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opt.set_link_layer_addr(addr);
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},
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Repr::PrefixInformation(PrefixInformation {
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prefix_len, flags, valid_lifetime,
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preferred_lifetime, prefix
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}) => {
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opt.clear_prefix_reserved();
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opt.set_option_type(Type::PrefixInformation);
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opt.set_data_len(4);
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opt.set_prefix_len(prefix_len);
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opt.set_prefix_flags(flags);
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opt.set_valid_lifetime(valid_lifetime);
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opt.set_preferred_lifetime(preferred_lifetime);
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opt.set_prefix(prefix);
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},
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Repr::RedirectedHeader(RedirectedHeader {
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header, data
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}) => {
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let data_len = data.len() / 8;
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opt.clear_redirected_reserved();
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opt.set_option_type(Type::RedirectedHeader);
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opt.set_data_len((header.buffer_len() + 1 + data_len) as u8);
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let mut ip_packet =
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Ipv6Packet::new_unchecked(&mut opt.data_mut()[field::IP_DATA..]);
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header.emit(&mut ip_packet);
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let payload = &mut ip_packet.into_inner()[header.buffer_len()..];
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payload.copy_from_slice(&data[..data_len]);
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}
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Repr::Mtu(mtu) => {
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opt.set_option_type(Type::Mtu);
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opt.set_data_len(1);
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opt.set_mtu(mtu);
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}
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Repr::Unknown { type_: id, length, data } => {
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opt.set_option_type(Type::Unknown(id));
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opt.set_data_len(length);
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opt.data_mut().copy_from_slice(data);
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}
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}
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}
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}
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impl<'a> fmt::Display for Repr<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "NDISC Option: ")?;
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match *self {
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Repr::SourceLinkLayerAddr(addr) => {
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write!(f, "SourceLinkLayer addr={}", addr)
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},
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Repr::TargetLinkLayerAddr(addr) => {
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write!(f, "TargetLinkLayer addr={}", addr)
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},
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Repr::PrefixInformation(PrefixInformation {
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prefix, prefix_len,
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..
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}) => {
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write!(f, "PrefixInformation prefix={}/{}", prefix, prefix_len)
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},
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Repr::RedirectedHeader(RedirectedHeader {
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header,
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..
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}) => {
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write!(f, "RedirectedHeader header={}", header)
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},
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Repr::Mtu(mtu) => {
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write!(f, "MTU mtu={}", mtu)
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},
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Repr::Unknown { type_: id, length, .. } => {
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write!(f, "Unknown({}) length={}", id, length)
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}
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}
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}
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}
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use crate::wire::pretty_print::{PrettyPrint, PrettyIndent};
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impl<T: AsRef<[u8]>> PrettyPrint for NdiscOption<T> {
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fn pretty_print(buffer: &dyn AsRef<[u8]>, f: &mut fmt::Formatter,
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indent: &mut PrettyIndent) -> fmt::Result {
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match NdiscOption::new_checked(buffer) {
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Err(err) => return write!(f, "{}({})", indent, err),
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Ok(ndisc) => {
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match Repr::parse(&ndisc) {
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Err(_) => Ok(()),
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Ok(repr) => {
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write!(f, "{}{}", indent, repr)
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}
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}
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}
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}
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}
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}
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#[cfg(test)]
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mod test {
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use crate::Error;
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use crate::time::Duration;
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use crate::wire::{EthernetAddress, Ipv6Address};
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use super::{NdiscOption, Type, PrefixInfoFlags, PrefixInformation, Repr};
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static PREFIX_OPT_BYTES: [u8; 32] = [
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0x03, 0x04, 0x40, 0xc0,
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0x00, 0x00, 0x03, 0x84,
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0x00, 0x00, 0x03, 0xe8,
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0x00, 0x00, 0x00, 0x00,
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0xfe, 0x80, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x01
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];
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#[test]
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fn test_deconstruct() {
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let opt = NdiscOption::new_unchecked(&PREFIX_OPT_BYTES[..]);
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assert_eq!(opt.option_type(), Type::PrefixInformation);
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assert_eq!(opt.data_len(), 4);
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assert_eq!(opt.prefix_len(), 64);
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assert_eq!(opt.prefix_flags(), PrefixInfoFlags::ON_LINK | PrefixInfoFlags::ADDRCONF);
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assert_eq!(opt.valid_lifetime(), Duration::from_secs(900));
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assert_eq!(opt.preferred_lifetime(), Duration::from_secs(1000));
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assert_eq!(opt.prefix(), Ipv6Address::new(0xfe80, 0, 0, 0, 0, 0, 0, 1));
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}
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#[test]
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fn test_construct() {
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let mut bytes = [0x00; 32];
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let mut opt = NdiscOption::new_unchecked(&mut bytes[..]);
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opt.set_option_type(Type::PrefixInformation);
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opt.set_data_len(4);
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opt.set_prefix_len(64);
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opt.set_prefix_flags(PrefixInfoFlags::ON_LINK | PrefixInfoFlags::ADDRCONF);
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opt.set_valid_lifetime(Duration::from_secs(900));
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opt.set_preferred_lifetime(Duration::from_secs(1000));
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opt.set_prefix(Ipv6Address::new(0xfe80, 0, 0, 0, 0, 0, 0, 1));
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assert_eq!(&PREFIX_OPT_BYTES[..], &opt.into_inner()[..]);
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}
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#[test]
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fn test_short_packet() {
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assert_eq!(NdiscOption::new_checked(&[0x00, 0x00]), Err(Error::Truncated));
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let bytes = [
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0x03, 0x01, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00
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];
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assert_eq!(NdiscOption::new_checked(&bytes), Err(Error::Truncated));
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}
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#[test]
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fn test_repr_parse_link_layer_opt() {
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let mut bytes = [0x01, 0x01, 0x54, 0x52, 0x00, 0x12, 0x23, 0x34];
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let addr = EthernetAddress([0x54, 0x52, 0x00, 0x12, 0x23, 0x34]);
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{
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assert_eq!(Repr::parse(&NdiscOption::new_unchecked(&bytes)),
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Ok(Repr::SourceLinkLayerAddr(addr)));
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}
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bytes[0] = 0x02;
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{
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assert_eq!(Repr::parse(&NdiscOption::new_unchecked(&bytes)),
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Ok(Repr::TargetLinkLayerAddr(addr)));
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}
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}
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#[test]
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fn test_repr_parse_prefix_info() {
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let repr = Repr::PrefixInformation(PrefixInformation {
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prefix_len: 64,
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flags: PrefixInfoFlags::ON_LINK | PrefixInfoFlags::ADDRCONF,
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valid_lifetime: Duration::from_secs(900),
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preferred_lifetime: Duration::from_secs(1000),
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prefix: Ipv6Address::new(0xfe80, 0, 0, 0, 0, 0, 0, 1)
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});
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assert_eq!(Repr::parse(&NdiscOption::new_unchecked(&PREFIX_OPT_BYTES)), Ok(repr));
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}
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#[test]
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fn test_repr_emit_prefix_info() {
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let mut bytes = [0x2a; 32];
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let repr = Repr::PrefixInformation(PrefixInformation {
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prefix_len: 64,
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flags: PrefixInfoFlags::ON_LINK | PrefixInfoFlags::ADDRCONF,
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valid_lifetime: Duration::from_secs(900),
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preferred_lifetime: Duration::from_secs(1000),
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prefix: Ipv6Address::new(0xfe80, 0, 0, 0, 0, 0, 0, 1)
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});
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let mut opt = NdiscOption::new_unchecked(&mut bytes);
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repr.emit(&mut opt);
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assert_eq!(&opt.into_inner()[..], &PREFIX_OPT_BYTES[..]);
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}
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#[test]
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fn test_repr_parse_mtu() {
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let bytes = [0x05, 0x01, 0x00, 0x00, 0x00, 0x00, 0x05, 0xdc];
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assert_eq!(Repr::parse(&NdiscOption::new_unchecked(&bytes)), Ok(Repr::Mtu(1500)));
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}
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}
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