bin/recovery_netstack/src/device/arp.rs

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

//! The Address Resolution Protocol (ARP).

/// The type of an ARP operation.
#[derive(Debug, PartialEq)]
#[allow(missing_docs)]
#[repr(u16)]
pub enum ArpOp {
    Request = ArpOp::REQUEST,
    Response = ArpOp::RESPONSE,
}

impl ArpOp {
    const REQUEST: u16 = 0x0001;
    const RESPONSE: u16 = 0x0002;

    /// Construct an `ArpOp` from a `u16`.
    ///
    /// `from_u16` returns the `ArpOp` with the numerical value `u`, or `None`
    /// if the value is unrecognized.
    pub fn from_u16(u: u16) -> Option<ArpOp> {
        match u {
            Self::REQUEST => Some(ArpOp::Request),
            Self::RESPONSE => Some(ArpOp::Response),
            _ => None,
        }
    }
}

/// An ARP hardware protocol.
#[derive(Debug, PartialEq)]
#[allow(missing_docs)]
#[repr(u16)]
pub enum ArpHardwareType {
    Ethernet = ArpHardwareType::ETHERNET,
}

impl ArpHardwareType {
    const ETHERNET: u16 = 0x0001;

    /// Construct an `ArpHardwareType` from a `u16`.
    ///
    /// `from_u16` returns the `ArpHardwareType` with the numerical value `u`,
    /// or `None` if the value is unrecognized.
    pub fn from_u16(u: u16) -> Option<ArpHardwareType> {
        match u {
            Self::ETHERNET => Some(ArpHardwareType::Ethernet),
            _ => None,
        }
    }
}