examples/slaac: add SLAAC example

Author: bergzand

Cargo.toml

@@ -337,5 +337,9 @@ required-features = ["std", "medium-ieee802154", "phy-raw_socket", "proto-sixlow
 name = "dns"
 required-features = ["std", "medium-ethernet", "medium-ip", "phy-tuntap_interface", "proto-ipv4", "socket-dns"]
 
+[[example]]
+name = "slaac"
+required-features = ["std", "medium-ethernet", "medium-ip", "phy-tuntap_interface", "proto-ipv6", "socket-udp"]
+
 [profile.release]
 debug = 2

examples/slaac.rs

@@ -0,0 +1,76 @@
+mod utils;
+
+use std::os::unix::io::AsRawFd;
+
+use smoltcp::iface::{Config, Interface, SocketSet};
+use smoltcp::phy::{wait as phy_wait, Device, Medium};
+use smoltcp::socket::udp;
+use smoltcp::time::{Duration, Instant};
+use smoltcp::wire::{EthernetAddress, IpAddress, IpCidr, Ipv6Address};
+
+const LOCAL_ADDR: Ipv6Address = Ipv6Address::new(0xfe80, 0, 0, 0, 0x0, 0, 0, 0x01);
+
+fn main() {
+    utils::setup_logging("warn");
+
+    let (mut opts, mut free) = utils::create_options();
+    utils::add_tuntap_options(&mut opts, &mut free);
+    utils::add_middleware_options(&mut opts, &mut free);
+
+    let mut matches = utils::parse_options(&opts, free);
+    let device = utils::parse_tuntap_options(&mut matches);
+    let fd = device.as_raw_fd();
+    let mut device =
+        utils::parse_middleware_options(&mut matches, device, /*loopback=*/ false);
+
+    // Create interface
+    let mut config = match device.capabilities().medium {
+        Medium::Ethernet => {
+            Config::new(EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x01]).into())
+        }
+        Medium::Ip => Config::new(smoltcp::wire::HardwareAddress::Ip),
+        Medium::Ieee802154 => todo!(),
+    };
+    config.slaac = true;
+
+    let mut iface = Interface::new(config, &mut device, Instant::now());
+    iface.update_ip_addrs(|ip_addrs| {
+        ip_addrs
+            .push(IpCidr::new(IpAddress::from(LOCAL_ADDR), 64))
+            .unwrap();
+    });
+
+    let mut sockets = SocketSet::new(vec![]);
+    let udp_rx_buffer = udp::PacketBuffer::new(vec![udp::PacketMetadata::EMPTY; 4], vec![0; 1024]);
+    let udp_tx_buffer = udp::PacketBuffer::new(vec![udp::PacketMetadata::EMPTY], vec![0; 0]);
+    let udp_socket = udp::Socket::new(udp_rx_buffer, udp_tx_buffer);
+    let _udp_handle = sockets.add(udp_socket);
+
+    let mut last_print = Instant::now();
+    loop {
+        let timestamp = Instant::now();
+        iface.poll(timestamp, &mut device, &mut sockets);
+        let mut delay = iface.poll_delay(timestamp, &sockets);
+        if delay.is_none() || delay.is_some_and(|d| d > Duration::from_millis(1000)) {
+            delay = Some(Duration::from_millis(1000));
+        }
+
+        phy_wait(fd, delay).expect("wait error");
+
+        let timestamp = Instant::now();
+        if timestamp > last_print + Duration::from_secs(1) {
+            last_print = timestamp;
+            println!();
+            println!("Addresses:");
+            for addr in iface.ip_addrs() {
+                println!("  - {addr}");
+            }
+            println!("Routes:");
+            iface.routes_mut().update(|routes| {
+                for route in routes {
+                    println!("  - {} via {}", route.cidr, route.via_router);
+                }
+            });
+        }
+    }
+}