Struct UdpRelay 

pub struct UdpRelay { /* private fields */ }

Relays non-DNS UDP traffic between the guest and the real network.

Each unique (guest_src, guest_dst) pair gets a host-side UDP socket and a tokio relay task. The poll loop calls relay_outbound() to send guest datagrams; response frames are injected directly into rx_ring.

Implementations

impl UdpRelay

pub fn new( shared: Arc<SharedState>, gateway_mac: [u8; 6], guest_mac: [u8; 6], tokio_handle: Handle, ) -> Self

Build a new UDP relay.

Arguments

• shared - Stack-wide shared state used to inject response frames into rx_ring and wake the poll thread.
• gateway_mac - MAC address stamped as the source on synthesized response frames.
• guest_mac - MAC address stamped as the destination on synthesized response frames.
• tokio_handle - Runtime the per-session relay tasks are spawned on.

pub fn relay_outbound( &mut self, frame: &[u8], src: SocketAddr, guest_dst: SocketAddr, host_dst: SocketAddr, )

Relay an outbound UDP datagram from the guest.

Arguments

• frame - Raw ethernet frame captured from the guest.
• src - Guest source address; keys the session and becomes the destination on response frames.
• guest_dst - Destination the guest wrote on the datagram. Retained as the session key and the source IP on replies.
• host_dst - Address the host socket actually connects to. Usually equal to guest_dst; the caller substitutes loopback when guest_dst matches the gateway IP.

pub fn cleanup_expired(&mut self)

Remove expired sessions.