185 lines
5.6 KiB
Rust
185 lines
5.6 KiB
Rust
use core::cell::RefCell;
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///! Network abstraction layer for smoltcp.
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use heapless::{consts, Vec};
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use miniconf::embedded_nal::{self as nal, nb};
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use super::Ethernet;
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pub struct NetStorage {
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pub ip_addrs: [smoltcp::wire::IpCidr; 1],
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pub sockets: [Option<smoltcp::socket::SocketSetItem<'static, 'static>>; 1],
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pub neighbor_cache:
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[Option<(smoltcp::wire::IpAddress, smoltcp::iface::Neighbor)>; 8],
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pub routes_cache:
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[Option<(smoltcp::wire::IpCidr, smoltcp::iface::Route)>; 8],
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pub tx_storage: [u8; 4096],
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pub rx_storage: [u8; 4096],
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}
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#[derive(Debug)]
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pub enum NetworkError {
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NoSocket,
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ConnectionFailure,
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ReadFailure,
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WriteFailure,
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Unsupported,
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}
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pub struct NetworkStack<'a, 'b, 'c> {
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network_interface: RefCell<Ethernet>,
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sockets: RefCell<smoltcp::socket::SocketSet<'a, 'b, 'c>>,
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next_port: RefCell<u16>,
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unused_handles: RefCell<Vec<smoltcp::socket::SocketHandle, consts::U16>>,
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}
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impl<'a, 'b, 'c> NetworkStack<'a, 'b, 'c> {
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pub fn new(
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interface: Ethernet,
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sockets: smoltcp::socket::SocketSet<'a, 'b, 'c>,
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) -> Self {
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let mut unused_handles: Vec<
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smoltcp::socket::SocketHandle,
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consts::U16,
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> = Vec::new();
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for socket in sockets.iter() {
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unused_handles.push(socket.handle()).unwrap();
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}
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NetworkStack {
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network_interface: RefCell::new(interface),
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sockets: RefCell::new(sockets),
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next_port: RefCell::new(49152),
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unused_handles: RefCell::new(unused_handles),
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}
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}
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pub fn update(&self, time: u32) -> bool {
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match self.network_interface.borrow_mut().poll(
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&mut self.sockets.borrow_mut(),
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smoltcp::time::Instant::from_millis(time as i64),
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) {
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Ok(changed) => changed == false,
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Err(e) => {
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info!("{:?}", e);
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true
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}
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}
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}
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fn get_ephemeral_port(&self) -> u16 {
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// Get the next ephemeral port
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let current_port = self.next_port.borrow().clone();
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let (next, wrap) = self.next_port.borrow().overflowing_add(1);
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*self.next_port.borrow_mut() = if wrap { 49152 } else { next };
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return current_port;
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}
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}
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impl<'a, 'b, 'c> nal::TcpStack for NetworkStack<'a, 'b, 'c> {
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type Error = NetworkError;
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type TcpSocket = smoltcp::socket::SocketHandle;
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fn open(
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&self,
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_mode: nal::Mode,
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) -> Result<smoltcp::socket::SocketHandle, NetworkError> {
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match self.unused_handles.borrow_mut().pop() {
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Some(handle) => {
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// Abort any active connections on the handle.
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let mut sockets = self.sockets.borrow_mut();
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let internal_socket: &mut smoltcp::socket::TcpSocket =
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&mut *sockets.get(handle);
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internal_socket.abort();
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Ok(handle)
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}
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None => Err(NetworkError::NoSocket),
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}
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}
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fn connect(
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&self,
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socket: smoltcp::socket::SocketHandle,
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remote: nal::SocketAddr,
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) -> Result<smoltcp::socket::SocketHandle, NetworkError> {
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let mut sockets = self.sockets.borrow_mut();
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let internal_socket: &mut smoltcp::socket::TcpSocket =
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&mut *sockets.get(socket);
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// If we're already in the process of connecting, ignore the request silently.
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if internal_socket.is_open() {
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return Ok(socket);
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}
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match remote.ip() {
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nal::IpAddr::V4(addr) => {
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let octets = addr.octets();
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let address = smoltcp::wire::Ipv4Address::new(
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octets[0], octets[1], octets[2], octets[3],
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);
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internal_socket
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.connect(
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(address, remote.port()),
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self.get_ephemeral_port(),
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)
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.map_err(|_| NetworkError::ConnectionFailure)?;
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Ok(socket)
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}
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// We only support IPv4.
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_ => Err(NetworkError::Unsupported),
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}
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}
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fn is_connected(
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&self,
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socket: &smoltcp::socket::SocketHandle,
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) -> Result<bool, NetworkError> {
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let mut sockets = self.sockets.borrow_mut();
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let socket: &mut smoltcp::socket::TcpSocket =
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&mut *sockets.get(*socket);
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Ok(socket.may_send() && socket.may_recv())
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}
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fn write(
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&self,
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socket: &mut smoltcp::socket::SocketHandle,
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buffer: &[u8],
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) -> nb::Result<usize, NetworkError> {
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let mut sockets = self.sockets.borrow_mut();
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let socket: &mut smoltcp::socket::TcpSocket =
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&mut *sockets.get(*socket);
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socket
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.send_slice(buffer)
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.map_err(|_| nb::Error::Other(NetworkError::WriteFailure))
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}
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fn read(
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&self,
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socket: &mut smoltcp::socket::SocketHandle,
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buffer: &mut [u8],
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) -> nb::Result<usize, NetworkError> {
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let mut sockets = self.sockets.borrow_mut();
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let socket: &mut smoltcp::socket::TcpSocket =
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&mut *sockets.get(*socket);
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socket
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.recv_slice(buffer)
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.map_err(|_| nb::Error::Other(NetworkError::ReadFailure))
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}
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fn close(
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&self,
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socket: smoltcp::socket::SocketHandle,
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) -> Result<(), NetworkError> {
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let mut sockets = self.sockets.borrow_mut();
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let internal_socket: &mut smoltcp::socket::TcpSocket =
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&mut *sockets.get(socket);
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internal_socket.close();
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self.unused_handles.borrow_mut().push(socket).unwrap();
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Ok(())
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}
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}
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