Module tunnel 

TUN tunnel loop — intercepts all TCP flows and relays them through the proxy chain.

Architecture

A dedicated OS thread runs the smoltcp poll loop (because TunTapInterface is not Send). For every new TCP connection that appears on the TUN device, the poll loop spawns an async relay task via a Tokio Handle.

Data flows between the poll loop and relay tasks through tokio::sync::mpsc channels:

TUN fd  ──packets──►  IpDevice  ──►  smoltcp::Interface::poll()
                                            │
                         ┌──────────────────┘
                         │  per-flow mpsc channels
                         ▼
                    relay_flow()  ──►  ChainEngine::connect()  ──►  proxy

Re-exports

pub use crate::chain::ChainConfig;

Structs

ProxyChainTunnel

Intercepts all TCP flows arriving on a TUN device and relays them through the configured proxy chain.

TunnelConfig

Configuration for ProxyChainTunnel.