dslite-b4 0.1.0

DS-Lite B4 tunnel management daemon
Documentation 
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use std::{
    net::{Ipv4Addr, Ipv6Addr},
    num::NonZeroU8,
};
use thiserror::Error;

// RFC 6333 5.7: AFTR element reserved address
const AFTR_V4_ELEMENT: Ipv4Addr = Ipv4Addr::new(192, 0, 0, 1);
// RFC 6333 5.7: B4 elements live in 192.0.0.0/29 (B4 hosts at .2..=.6,
// AFTR at .1, .0 subnet, .7 broadcast).
const B4_V4_PREFIX_LEN: u8 = 29;

#[cfg(target_os = "linux")]
pub mod linux;

#[cfg(target_os = "illumos")]
pub mod illumos;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Observed {
    Absent,
    Present {
        local_v6: Ipv6Addr,
        remote_v6: Ipv6Addr,
        mtu: u32,
        encapsulation_limit: Option<u8>,
        admin_up: bool,
    },
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct DesiredState {
    pub local_v6: Ipv6Addr,
    pub remote_v6: Ipv6Addr,
    pub local_v4: Ipv4Addr,
    pub mtu: Option<u32>,
    pub encapsulation_limit: Option<EncapsulationLimit>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct TunnelUpdate {
    pub mtu: Option<u32>,
    pub encapsulation_limit: Option<EncapsulationLimit>,
    pub bring_up: bool,
}

impl TunnelUpdate {
    pub(crate) fn is_empty(&self) -> bool {
        self.mtu.is_none() && self.encapsulation_limit.is_none() && !self.bring_up
    }
}

#[derive(Debug, Error)]
pub enum TunnelError {
    #[error("creating tunnel: {0}")]
    CreationFailed(String),
    #[error("destroying tunnel: {0}")]
    DestroyFailed(String),
    #[error("assigning address: {0}")]
    AddressFailed(String),
    #[error("setting route: {0}")]
    RouteFailed(String),
    #[error("checking tunnel status: {0}")]
    StatusCheckFailed(String),
    #[error("updating tunnel: {0}")]
    UpdateFailed(String),
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum EncapsulationLimit {
    Disabled,
    Value(NonZeroU8),
}

pub trait TunnelBackend: Send + Sync {
    /// Creates the tunnel and its required network state.
    ///
    /// If setup fails after creating platform state, the backend makes a best
    /// effort to remove state created by that call. The original setup error is
    /// returned. Cleanup errors are logged separately.
    fn setup(&self, desired: DesiredState) -> impl Future<Output = Result<(), TunnelError>> + Send;
    fn update(
        &self,
        desired: DesiredState,
        update: TunnelUpdate,
    ) -> impl Future<Output = Result<(), TunnelError>> + Send;
    fn observe(&self) -> impl Future<Output = Result<Observed, TunnelError>> + Send;
    fn teardown(&self) -> impl Future<Output = Result<(), TunnelError>> + Send;
}