create and configure a virtual interface

3 files changed, 1408 insertions, 2 deletions

diff --git a/Cargo.lock b/Cargo.lock
index a6e725a..dce4d9f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
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+ "windows_i686_gnu 0.48.0",
+ "windows_i686_msvc 0.48.0",
+ "windows_x86_64_gnu 0.48.0",
+ "windows_x86_64_gnullvm 0.48.0",
+ "windows_x86_64_msvc 0.48.0",
+]
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+checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+dependencies = [
+ "winapi 0.2.8",
+ "winapi-build",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 1a6a988..65e7dae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,10 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+ipnet = "2.7.2"
+notify = "5.1.0"
+rsdsl_ip_config = { git = "https://github.com/rsdsl/ip_config.git", version = "0.1.0" }
+rsdsl_netlinkd = { git = "https://github.com/rsdsl/netlinkd.git", version = "0.1.1" }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+tun-tap = "0.1.3"
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..9abd562 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,102 @@
-fn main() {
-    println!("Hello, world!");
+use std::fs::File;
+use std::net::{Ipv4Addr, Ipv6Addr};
+use std::path::Path;
+use std::thread;
+use std::time::Duration;
+
+use ipnet::Ipv6Net;
+use notify::event::{CreateKind, ModifyKind};
+use notify::{Event, EventKind, RecursiveMode, Watcher};
+use rsdsl_netlinkd::error::Result;
+use rsdsl_netlinkd::{addr, link, route};
+use serde::{Deserialize, Serialize};
+use tun_tap::{Iface, Mode};
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+struct Config {
+    pub serv: Ipv4Addr,
+    pub tn64: Ipv6Addr,
+    pub rt64: Ipv6Addr,
+    pub rt48: Ipv6Addr,
+}
+
+#[derive(Clone, Debug)]
+struct UsableConfig {
+    pub serv: Ipv4Addr,
+    pub tn64: Ipv6Net,
+    pub rt64: Ipv6Net,
+    pub rt48: Ipv6Net,
+}
+
+impl From<Config> for UsableConfig {
+    fn from(config: Config) -> Self {
+        Self {
+            serv: config.serv,
+            tn64: Ipv6Net::new(config.tn64, 64).unwrap(),
+            rt64: Ipv6Net::new(config.rt64, 64).unwrap(),
+            rt48: Ipv6Net::new(config.rt48, 48).unwrap(),
+        }
+    }
+}
+
+fn main() -> Result<()> {
+    let mut file = File::open("/data/he6in4.conf")?;
+    let config: Config = serde_json::from_reader(&mut file)?;
+    let config: UsableConfig = config.into();
+
+    let ip_config = Path::new(rsdsl_ip_config::LOCATION);
+    while !ip_config.exists() {
+        println!("[6in4] wait for pppoe");
+        thread::sleep(Duration::from_secs(8));
+    }
+
+    let tun = Iface::new("he6in4", Mode::Tun)?;
+
+    configure_tunnel(&config);
+
+    let mut watcher = notify::recommended_watcher(move |res: notify::Result<Event>| match res {
+        Ok(event) => match event.kind {
+            EventKind::Create(kind) if kind == CreateKind::File => {
+                // configure_tunnel(&config);
+            }
+            EventKind::Modify(kind) if matches!(kind, ModifyKind::Data(_)) => {
+                // configure_tunnel(&config);
+            }
+            _ => {}
+        },
+        Err(e) => println!("[6in4] watch error: {:?}", e),
+    })?;
+
+    watcher.watch(ip_config, RecursiveMode::NonRecursive)?;
+
+    loop {
+        thread::sleep(Duration::MAX)
+    }
+}
+
+fn configure_tunnel(config: &UsableConfig) {
+    match configure_he6in4(config) {
+        Ok(_) => {
+            println!("[6in4] configure he6in4 ({})", config.serv);
+            println!("[6in4] tunnel /64: {}", config.tn64);
+            println!("[6in4] routed /64: {}", config.rt64);
+            println!("[6in4] routed /48: {}", config.rt48);
+        }
+        Err(e) => println!("[6in4] can't configure he6in4: {:?}", e),
+    }
+}
+
+fn configure_he6in4(config: &UsableConfig) -> Result<()> {
+    let local_v6: Ipv6Addr = (u128::from_be_bytes(config.tn64.trunc().addr().octets()) | 2).into();
+    let remote_v6: Ipv6Addr = (u128::from_be_bytes(config.tn64.trunc().addr().octets()) | 1).into();
+
+    link::set_mtu("he6in4".into(), 1472)?;
+    link::up("he6in4".into())?;
+
+    addr::flush("he6in4".into())?;
+    addr::add("he6in4".into(), local_v6.into(), 64)?;
+
+    route::add6(Ipv6Addr::UNSPECIFIED, 0, Some(remote_v6), "he6in4".into())?;
+
+    Ok(())
 }