mirror of
https://github.com/smoltcp-rs/smoltcp.git
synced 2025-09-30 06:10:55 +00:00
34b1fa505b
Instead of eagerly sending the join/leave packet when the user calls join/leave, we update internal state and send the packet when the interface is polled. Advantages: - If the device is exhausted, the packet gets sent later instead of just failing and returning an error to the user. - Makes the API consistent with everything else in smoltcp: operations only update internal state, poll is what sends/receives packets. - Enables wrappers to offer simpler APIs with less generics. See https://github.com/embassy-rs/embassy/pull/3329 for an example, which is my original motivation.
91 lines
3.0 KiB
Rust
91 lines
3.0 KiB
Rust
mod utils;
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use std::os::unix::io::AsRawFd;
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use smoltcp::iface::{Config, Interface, SocketSet};
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use smoltcp::phy::wait as phy_wait;
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use smoltcp::phy::{Device, Medium};
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use smoltcp::socket::udp;
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use smoltcp::time::Instant;
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use smoltcp::wire::{EthernetAddress, IpAddress, IpCidr, Ipv6Address};
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// Note: If testing with a tap interface in linux, you may need to specify the
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// interface index when addressing. E.g.,
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//
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// ```
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// ncat -u ff02::1234%tap0 8123
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// ```
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//
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// will send packets to the multicast group we join below on tap0.
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const PORT: u16 = 8123;
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const GROUP: [u16; 8] = [0xff02, 0, 0, 0, 0, 0, 0, 0x1234];
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const LOCAL_ADDR: [u16; 8] = [0xfe80, 0, 0, 0, 0, 0, 0, 0x101];
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const ROUTER_ADDR: [u16; 8] = [0xfe80, 0, 0, 0, 0, 0, 0, 0x100];
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fn main() {
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utils::setup_logging("warn");
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let (mut opts, mut free) = utils::create_options();
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utils::add_tuntap_options(&mut opts, &mut free);
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utils::add_middleware_options(&mut opts, &mut free);
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let mut matches = utils::parse_options(&opts, free);
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let device = utils::parse_tuntap_options(&mut matches);
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let fd = device.as_raw_fd();
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let mut device =
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utils::parse_middleware_options(&mut matches, device, /*loopback=*/ false);
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// Create interface
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let local_addr = Ipv6Address::from_parts(&LOCAL_ADDR);
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let ethernet_addr = EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x02]);
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let mut config = match device.capabilities().medium {
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Medium::Ethernet => Config::new(ethernet_addr.into()),
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Medium::Ip => Config::new(smoltcp::wire::HardwareAddress::Ip),
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Medium::Ieee802154 => todo!(),
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};
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config.random_seed = rand::random();
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let mut iface = Interface::new(config, &mut device, Instant::now());
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iface.update_ip_addrs(|ip_addrs| {
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ip_addrs
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.push(IpCidr::new(IpAddress::from(local_addr), 64))
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.unwrap();
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});
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iface
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.routes_mut()
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.add_default_ipv6_route(Ipv6Address::from_parts(&ROUTER_ADDR))
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.unwrap();
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// Create sockets
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let mut sockets = SocketSet::new(vec![]);
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let udp_rx_buffer = udp::PacketBuffer::new(vec![udp::PacketMetadata::EMPTY; 4], vec![0; 1024]);
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let udp_tx_buffer = udp::PacketBuffer::new(vec![udp::PacketMetadata::EMPTY], vec![0; 0]);
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let udp_socket = udp::Socket::new(udp_rx_buffer, udp_tx_buffer);
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let udp_handle = sockets.add(udp_socket);
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// Join a multicast group
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iface
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.join_multicast_group(Ipv6Address::from_parts(&GROUP))
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.unwrap();
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loop {
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let timestamp = Instant::now();
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iface.poll(timestamp, &mut device, &mut sockets);
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let socket = sockets.get_mut::<udp::Socket>(udp_handle);
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if !socket.is_open() {
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socket.bind(PORT).unwrap()
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}
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if socket.can_recv() {
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socket
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.recv()
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.map(|(data, sender)| println!("traffic: {} UDP bytes from {}", data.len(), sender))
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.unwrap_or_else(|e| println!("Recv UDP error: {:?}", e));
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}
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phy_wait(fd, iface.poll_delay(timestamp, &sockets)).expect("wait error");
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}
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}
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