Work on Up/Down operation on WireGuard device

src/wireguard/peer.rs

@@ -0,0 +1,111 @@
+use super::constants::*;
+use super::router;
+use super::timers::{Events, Timers};
+use super::HandshakeJob;
+
+use super::bind::Bind;
+use super::bind::Reader as BindReader;
+use super::tun::{Reader, Tun};
+
+use std::fmt;
+use std::ops::Deref;
+use std::sync::atomic::{AtomicBool, AtomicU64, AtomicUsize, Ordering};
+use std::sync::Arc;
+use std::time::{Instant, SystemTime};
+
+use spin::{Mutex, RwLock, RwLockReadGuard, RwLockWriteGuard};
+
+use crossbeam_channel::Sender;
+use x25519_dalek::PublicKey;
+
+pub struct Peer<T: Tun, B: Bind> {
+    pub router: Arc<router::Peer<B::Endpoint, Events<T, B>, T::Writer, B::Writer>>,
+    pub state: Arc<PeerInner<B>>,
+}
+
+pub struct PeerInner<B: Bind> {
+    // internal id (for logging)
+    pub id: u64,
+
+    // handshake state
+    pub walltime_last_handshake: Mutex<SystemTime>,
+    pub last_handshake_sent: Mutex<Instant>, // instant for last handshake
+    pub handshake_queued: AtomicBool,        // is a handshake job currently queued for the peer?
+    pub queue: Mutex<Sender<HandshakeJob<B::Endpoint>>>, // handshake queue
+
+    // stats and configuration
+    pub pk: PublicKey, // public key, DISCUSS: avoid this. TODO: remove
+    pub keepalive_interval: AtomicU64, // keepalive interval
+    pub rx_bytes: AtomicU64, // received bytes
+    pub tx_bytes: AtomicU64, // transmitted bytes
+
+    // timer model
+    pub timers: RwLock<Timers>,
+}
+
+impl<T: Tun, B: Bind> Clone for Peer<T, B> {
+    fn clone(&self) -> Peer<T, B> {
+        Peer {
+            router: self.router.clone(),
+            state: self.state.clone(),
+        }
+    }
+}
+
+impl<B: Bind> PeerInner<B> {
+    #[inline(always)]
+    pub fn timers(&self) -> RwLockReadGuard<Timers> {
+        self.timers.read()
+    }
+
+    #[inline(always)]
+    pub fn timers_mut(&self) -> RwLockWriteGuard<Timers> {
+        self.timers.write()
+    }
+}
+
+impl<T: Tun, B: Bind> fmt::Display for Peer<T, B> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "peer(id = {})", self.id)
+    }
+}
+
+impl<T: Tun, B: Bind> Deref for Peer<T, B> {
+    type Target = PeerInner<B>;
+    fn deref(&self) -> &Self::Target {
+        &self.state
+    }
+}
+
+impl<T: Tun, B: Bind> Peer<T, B> {
+    pub fn down(&self) {
+        self.stop_timers();
+    }
+
+    pub fn up(&self) {}
+}
+
+impl<B: Bind> PeerInner<B> {
+    /* Queue a handshake request for the parallel workers
+     * (if one does not already exist)
+     *
+     * The function is ratelimited.
+     */
+    pub fn packet_send_handshake_initiation(&self) {
+        // the function is rate limited
+
+        {
+            let mut lhs = self.last_handshake_sent.lock();
+            if lhs.elapsed() < REKEY_TIMEOUT {
+                return;
+            }
+            *lhs = Instant::now();
+        }
+
+        // create a new handshake job for the peer
+
+        if !self.handshake_queued.swap(true, Ordering::SeqCst) {
+            self.queue.lock().send(HandshakeJob::New(self.pk)).unwrap();
+        }
+    }
+}