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|
use super::messages::{TransportHeader, TYPE_TRANSPORT};
use super::peer::Peer;
use super::queue::{ParallelJob, Queue, SequentialJob};
use super::types::Callbacks;
use super::KeyPair;
use super::{REJECT_AFTER_MESSAGES, SIZE_TAG};
use super::super::{tun, udp, Endpoint};
use alloc::sync::Arc;
use core::sync::atomic::{AtomicBool, Ordering};
use ring::aead::{Aad, LessSafeKey, Nonce, UnboundKey, CHACHA20_POLY1305};
use spin::Mutex;
use zerocopy::{AsBytes, LayoutVerified};
struct Inner<E: Endpoint, C: Callbacks, T: tun::Writer, B: udp::Writer<E>> {
ready: AtomicBool,
buffer: Mutex<Vec<u8>>,
counter: u64,
keypair: Arc<KeyPair>,
peer: Peer<E, C, T, B>,
}
pub struct SendJob<E: Endpoint, C: Callbacks, T: tun::Writer, B: udp::Writer<E>>(
Arc<Inner<E, C, T, B>>,
);
impl<E: Endpoint, C: Callbacks, T: tun::Writer, B: udp::Writer<E>> Clone for SendJob<E, C, T, B> {
fn clone(&self) -> SendJob<E, C, T, B> {
SendJob(self.0.clone())
}
}
impl<E: Endpoint, C: Callbacks, T: tun::Writer, B: udp::Writer<E>> SendJob<E, C, T, B> {
pub fn new(
buffer: Vec<u8>,
counter: u64,
keypair: Arc<KeyPair>,
peer: Peer<E, C, T, B>,
) -> SendJob<E, C, T, B> {
SendJob(Arc::new(Inner {
buffer: Mutex::new(buffer),
counter,
keypair,
peer,
ready: AtomicBool::new(false),
}))
}
}
impl<E: Endpoint, C: Callbacks, T: tun::Writer, B: udp::Writer<E>> ParallelJob
for SendJob<E, C, T, B>
{
fn queue(&self) -> &Queue<Self> {
&self.0.peer.outbound
}
fn parallel_work(&self) {
debug_assert_eq!(
self.is_ready(),
false,
"doing parallel work on completed job"
);
log::trace!("processing parallel send job");
// encrypt body
{
// make space for the tag
let job = &*self.0;
let mut msg = job.buffer.lock();
msg.extend([0u8; SIZE_TAG].iter());
// cast to header (should never fail)
let (mut header, packet): (LayoutVerified<&mut [u8], TransportHeader>, &mut [u8]) =
LayoutVerified::new_from_prefix(&mut msg[..])
.expect("earlier code should ensure that there is ample space");
// set header fields
debug_assert!(
job.counter < REJECT_AFTER_MESSAGES,
"should be checked when assigning counters"
);
header.f_type.set(TYPE_TRANSPORT);
header.f_receiver.set(job.keypair.send.id);
header.f_counter.set(job.counter);
// create a nonce object
let mut nonce = [0u8; 12];
debug_assert_eq!(nonce.len(), CHACHA20_POLY1305.nonce_len());
nonce[4..].copy_from_slice(header.f_counter.as_bytes());
let nonce = Nonce::assume_unique_for_key(nonce);
// encrypt contents of transport message in-place
let tag_offset = packet.len() - SIZE_TAG;
let key = LessSafeKey::new(
UnboundKey::new(&CHACHA20_POLY1305, &job.keypair.send.key[..]).unwrap(),
);
let tag = key
.seal_in_place_separate_tag(nonce, Aad::empty(), &mut packet[..tag_offset])
.unwrap();
// append tag
packet[tag_offset..].copy_from_slice(tag.as_ref());
}
// mark ready
self.0.ready.store(true, Ordering::Release);
}
}
impl<E: Endpoint, C: Callbacks, T: tun::Writer, B: udp::Writer<E>> SequentialJob
for SendJob<E, C, T, B>
{
fn is_ready(&self) -> bool {
self.0.ready.load(Ordering::Acquire)
}
fn sequential_work(self) {
debug_assert_eq!(
self.is_ready(),
true,
"doing sequential work
on an incomplete job"
);
log::trace!("processing sequential send job");
// send to peer
let job = &self.0;
let msg = job.buffer.lock();
let xmit = job.peer.send_raw(&msg[..]).is_ok();
// trigger callback (for timers)
C::send(&job.peer.opaque, msg.len(), xmit, &job.keypair, job.counter);
}
}
|
