renet/src/socket/tcp.rs

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use core::fmt;
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use Error;
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use Managed;
use wire::{IpProtocol, IpEndpoint};
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use wire::{TcpPacket, TcpRepr, TcpControl};
use socket::{Socket, IpRepr, IpPayload};
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/// A TCP stream ring buffer.
#[derive(Debug)]
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pub struct SocketBuffer<'a> {
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storage: Managed<'a, [u8]>,
read_at: usize,
length: usize
}
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impl<'a> SocketBuffer<'a> {
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/// Create a packet buffer with the given storage.
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pub fn new<T>(storage: T) -> SocketBuffer<'a>
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where T: Into<Managed<'a, [u8]>> {
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SocketBuffer {
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storage: storage.into(),
read_at: 0,
length: 0
}
}
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fn capacity(&self) -> usize {
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self.storage.len()
}
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fn len(&self) -> usize {
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self.length
}
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fn window(&self) -> usize {
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self.capacity() - self.len()
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}
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fn clamp_writer(&self, mut size: usize) -> (usize, usize) {
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let write_at = (self.read_at + self.length) % self.storage.len();
// We can't enqueue more than there is free space.
let free = self.storage.len() - self.length;
if size > free { size = free }
// We can't contiguously enqueue past the beginning of the storage.
let until_end = self.storage.len() - write_at;
if size > until_end { size = until_end }
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(write_at, size)
}
fn enqueue(&mut self, size: usize) -> &mut [u8] {
let (write_at, size) = self.clamp_writer(size);
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self.length += size;
&mut self.storage[write_at..write_at + size]
}
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fn enqueue_slice(&mut self, data: &[u8]) {
let data = {
let mut dest = self.enqueue(data.len());
let (data, rest) = data.split_at(dest.len());
dest.copy_from_slice(data);
rest
};
// Retry, in case we had a wraparound.
let mut dest = self.enqueue(data.len());
let (data, _) = data.split_at(dest.len());
dest.copy_from_slice(data);
}
fn clamp_reader(&self, mut size: usize) -> (usize, usize) {
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let read_at = self.read_at;
// We can't dequeue more than was queued.
if size > self.length { size = self.length }
// We can't contiguously dequeue past the end of the storage.
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let until_end = self.storage.len() - read_at;
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if size > until_end { size = until_end }
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(read_at, size)
}
fn peek(&self, size: usize) -> &[u8] {
let (read_at, size) = self.clamp_reader(size);
&self.storage[read_at..read_at + size]
}
fn advance(&mut self, size: usize) {
let (read_at, size) = self.clamp_reader(size);
self.read_at = (read_at + size) % self.storage.len();
self.length -= size;
}
fn dequeue(&mut self, size: usize) -> &[u8] {
let (read_at, size) = self.clamp_reader(size);
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self.read_at = (self.read_at + size) % self.storage.len();
self.length -= size;
&self.storage[read_at..read_at + size]
}
}
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impl<'a> Into<SocketBuffer<'a>> for Managed<'a, [u8]> {
fn into(self) -> SocketBuffer<'a> {
SocketBuffer::new(self)
}
}
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum State {
Closed,
Listen,
SynSent,
SynReceived,
Established,
FinWait1,
FinWait2,
CloseWait,
Closing,
LastAck,
TimeWait
}
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impl fmt::Display for State {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&State::Closed => write!(f, "CLOSED"),
&State::Listen => write!(f, "LISTEN"),
&State::SynSent => write!(f, "SYN_SENT"),
&State::SynReceived => write!(f, "SYN_RECEIVED"),
&State::Established => write!(f, "ESTABLISHED"),
&State::FinWait1 => write!(f, "FIN_WAIT_1"),
&State::FinWait2 => write!(f, "FIN_WAIT_2"),
&State::CloseWait => write!(f, "CLOSE_WAIT"),
&State::Closing => write!(f, "CLOSING"),
&State::LastAck => write!(f, "LAST_ACK"),
&State::TimeWait => write!(f, "TIME_WAIT")
}
}
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}
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#[derive(Debug)]
struct Retransmit {
sent: bool // FIXME
}
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impl Retransmit {
fn new() -> Retransmit {
Retransmit { sent: false }
}
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fn reset(&mut self) {
self.sent = false
}
fn check(&mut self) -> bool {
let result = !self.sent;
self.sent = true;
result
}
}
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/// A Transmission Control Protocol data stream.
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#[derive(Debug)]
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pub struct TcpSocket<'a> {
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state: State,
local_endpoint: IpEndpoint,
remote_endpoint: IpEndpoint,
local_seq_no: i32,
remote_seq_no: i32,
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remote_last_ack: i32,
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remote_win_len: usize,
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retransmit: Retransmit,
rx_buffer: SocketBuffer<'a>,
tx_buffer: SocketBuffer<'a>
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}
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impl<'a> TcpSocket<'a> {
/// Create a socket using the given buffers.
pub fn new<T>(rx_buffer: T, tx_buffer: T) -> Socket<'a, 'static>
where T: Into<SocketBuffer<'a>> {
let rx_buffer = rx_buffer.into();
if rx_buffer.capacity() > <u16>::max_value() as usize {
panic!("buffers larger than {} require window scaling, which is not implemented",
<u16>::max_value())
}
Socket::Tcp(TcpSocket {
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state: State::Closed,
local_endpoint: IpEndpoint::default(),
remote_endpoint: IpEndpoint::default(),
local_seq_no: 0,
remote_seq_no: 0,
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remote_win_len: 0,
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remote_last_ack: 0,
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retransmit: Retransmit::new(),
tx_buffer: tx_buffer.into(),
rx_buffer: rx_buffer.into()
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})
}
/// Return the connection state.
#[inline(always)]
pub fn state(&self) -> State {
self.state
}
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/// Return the local endpoint.
#[inline(always)]
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pub fn local_endpoint(&self) -> IpEndpoint {
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self.local_endpoint
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}
/// Return the remote endpoint.
#[inline(always)]
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pub fn remote_endpoint(&self) -> IpEndpoint {
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self.remote_endpoint
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}
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fn set_state(&mut self, state: State) {
if self.state != state {
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if self.remote_endpoint.addr.is_unspecified() {
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net_trace!("tcp:{}: state={}→{}",
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self.local_endpoint, self.state, state);
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} else {
net_trace!("tcp:{}:{}: state={}→{}",
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self.local_endpoint, self.remote_endpoint, self.state, state);
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}
}
self.state = state
}
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/// Start listening on the given endpoint.
///
/// # Panics
/// This function will panic if the socket is not in the CLOSED state.
pub fn listen(&mut self, endpoint: IpEndpoint) {
assert!(self.state == State::Closed);
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self.local_endpoint = endpoint;
self.remote_endpoint = IpEndpoint::default();
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self.set_state(State::Listen);
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}
/// See [Socket::collect](enum.Socket.html#method.collect).
pub fn collect(&mut self, ip_repr: &IpRepr, payload: &[u8]) -> Result<(), Error> {
if ip_repr.protocol() != IpProtocol::Tcp { return Err(Error::Rejected) }
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let packet = try!(TcpPacket::new(payload));
let repr = try!(TcpRepr::parse(&packet, &ip_repr.src_addr(), &ip_repr.dst_addr()));
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// Reject packets with a wrong destination.
if self.local_endpoint.port != repr.dst_port { return Err(Error::Rejected) }
if !self.local_endpoint.addr.is_unspecified() &&
self.local_endpoint.addr != ip_repr.dst_addr() { return Err(Error::Rejected) }
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// Reject packets from a source to which we aren't connected.
if self.remote_endpoint.port != 0 &&
self.remote_endpoint.port != repr.src_port { return Err(Error::Rejected) }
if !self.remote_endpoint.addr.is_unspecified() &&
self.remote_endpoint.addr != ip_repr.src_addr() { return Err(Error::Rejected) }
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// Reject packets addressed to a closed socket.
if self.state == State::Closed {
net_trace!("tcp:{}:{}:{}: packet sent to a closed socket",
self.local_endpoint, ip_repr.src_addr(), repr.src_port);
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return Err(Error::Malformed)
}
// Reject unacceptable acknowledgements.
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match (self.state, repr) {
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// Don't care about ACKs when performing the handshake.
(State::Listen, _) => (),
(State::SynSent, _) => (),
// Every packet after the initial SYN must be an acknowledgement.
(_, TcpRepr { ack_number: None, .. }) => {
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net_trace!("tcp:{}:{}: expecting an ACK",
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self.local_endpoint, self.remote_endpoint);
return Err(Error::Malformed)
}
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// Every acknowledgement must be for transmitted but unacknowledged data.
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(state, TcpRepr { ack_number: Some(ack_number), .. }) => {
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let control_len =
if state == State::SynReceived { 1 } else { 0 };
let unacknowledged = self.tx_buffer.len() as i32 + control_len;
if !(ack_number - self.local_seq_no >= 0 &&
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ack_number - (self.local_seq_no + unacknowledged) <= 0) {
net_trace!("tcp:{}:{}: unacceptable ACK ({} not in {}..{})",
self.local_endpoint, self.remote_endpoint,
ack_number, self.local_seq_no, self.local_seq_no + unacknowledged);
return Err(Error::Malformed)
}
}
}
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// Reject segments not occupying a valid portion of the receive window.
// For now, do not try to reassemble out-of-order segments.
if self.state != State::Listen {
let next_remote_seq = self.remote_seq_no + self.rx_buffer.len() as i32 +
repr.control.len();
if repr.seq_number - next_remote_seq > 0 {
net_trace!("tcp:{}:{}: unacceptable SEQ ({} not in {}..)",
self.local_endpoint, self.remote_endpoint,
repr.seq_number, next_remote_seq);
return Err(Error::Malformed)
} else if repr.seq_number - next_remote_seq != 0 {
net_trace!("tcp:{}:{}: duplicate SEQ ({} in ..{})",
self.local_endpoint, self.remote_endpoint,
repr.seq_number, next_remote_seq);
return Ok(())
}
}
// Validate and update the state.
let old_state = self.state;
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match (self.state, repr) {
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(State::Listen, TcpRepr {
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src_port, dst_port, control: TcpControl::Syn, seq_number, ack_number: None, ..
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}) => {
self.local_endpoint = IpEndpoint::new(ip_repr.dst_addr(), dst_port);
self.remote_endpoint = IpEndpoint::new(ip_repr.src_addr(), src_port);
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self.local_seq_no = -seq_number; // FIXME: use something more secure
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self.remote_seq_no = seq_number + 1;
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self.set_state(State::SynReceived);
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self.retransmit.reset()
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}
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(State::SynReceived, TcpRepr { control: TcpControl::None, .. }) => {
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self.set_state(State::Established);
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self.retransmit.reset()
}
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(State::Established, TcpRepr { control: TcpControl::None, .. }) => (),
_ => {
net_trace!("tcp:{}:{}: unexpected packet {}",
self.local_endpoint, self.remote_endpoint, repr);
return Err(Error::Malformed)
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}
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}
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// Dequeue acknowledged octets.
if let Some(ack_number) = repr.ack_number {
let control_len =
if old_state == State::SynReceived { 1 } else { 0 };
if control_len > 0 {
net_trace!("tcp:{}:{}: ACK for a control flag",
self.local_endpoint, self.remote_endpoint);
}
if ack_number - self.local_seq_no - control_len > 0 {
net_trace!("tcp:{}:{}: ACK for {} octets",
self.local_endpoint, self.remote_endpoint,
ack_number - self.local_seq_no - control_len);
}
self.tx_buffer.advance((ack_number - self.local_seq_no - control_len) as usize);
self.local_seq_no = ack_number;
}
// Enqueue payload octets, which is guaranteed to be in order, unless we already did.
if repr.payload.len() > 0 {
net_trace!("tcp:{}:{}: receiving {} octets",
self.local_endpoint, self.remote_endpoint, repr.payload.len());
self.rx_buffer.enqueue_slice(repr.payload)
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}
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// Update window length.
self.remote_win_len = repr.window_len as usize;
Ok(())
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}
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/// See [Socket::dispatch](enum.Socket.html#method.dispatch).
pub fn dispatch<F, R>(&mut self, emit: &mut F) -> Result<R, Error>
where F: FnMut(&IpRepr, &IpPayload) -> Result<R, Error> {
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let mut repr = TcpRepr {
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src_port: self.local_endpoint.port,
dst_port: self.remote_endpoint.port,
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control: TcpControl::None,
seq_number: 0,
ack_number: None,
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window_len: self.rx_buffer.window() as u16,
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payload: &[]
};
// FIXME: process
match self.state {
State::Closed |
State::Listen => {
return Err(Error::Exhausted)
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}
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State::SynReceived => {
if !self.retransmit.check() { return Err(Error::Exhausted) }
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repr.control = TcpControl::Syn;
repr.seq_number = self.local_seq_no;
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repr.ack_number = Some(self.remote_seq_no);
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net_trace!("tcp:{}:{}: SYN|ACK sent",
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self.local_endpoint, self.remote_endpoint);
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self.remote_last_ack = self.remote_seq_no;
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}
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State::Established => {
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let ack_number = self.remote_seq_no + self.rx_buffer.len() as i32;
if self.remote_last_ack == ack_number { return Err(Error::Exhausted) }
repr.seq_number = self.local_seq_no;
repr.ack_number = Some(ack_number);
net_trace!("tcp:{}:{}: ACK sent",
self.local_endpoint, self.remote_endpoint);
self.remote_last_ack = ack_number;
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}
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_ => unreachable!()
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}
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let ip_repr = IpRepr::Unspecified {
src_addr: self.local_endpoint.addr,
dst_addr: self.remote_endpoint.addr,
protocol: IpProtocol::Tcp,
};
emit(&ip_repr, &repr)
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}
}
impl<'a> IpPayload for TcpRepr<'a> {
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fn buffer_len(&self) -> usize {
self.buffer_len()
}
fn emit(&self, ip_repr: &IpRepr, payload: &mut [u8]) {
let mut packet = TcpPacket::new(payload).expect("undersized payload");
self.emit(&mut packet, &ip_repr.src_addr(), &ip_repr.dst_addr())
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}
}
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#[cfg(test)]
mod test {
use wire::IpAddress;
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use super::*;
#[test]
fn test_buffer() {
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let mut buffer = SocketBuffer::new(vec![0; 8]); // ........
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buffer.enqueue(6).copy_from_slice(b"foobar"); // foobar..
assert_eq!(buffer.dequeue(3), b"foo"); // ...bar..
buffer.enqueue(6).copy_from_slice(b"ba"); // ...barba
buffer.enqueue(4).copy_from_slice(b"zho"); // zhobarba
assert_eq!(buffer.dequeue(6), b"barba"); // zho.....
assert_eq!(buffer.dequeue(8), b"zho"); // ........
buffer.enqueue(8).copy_from_slice(b"gefug"); // ...gefug
}
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#[test]
fn test_buffer_wraparound() {
let mut buffer = SocketBuffer::new(vec![0; 8]); // ........
buffer.enqueue_slice(&b"foobar"[..]); // foobar..
assert_eq!(buffer.dequeue(3), b"foo"); // ...bar..
buffer.enqueue_slice(&b"bazhoge"[..]); // zhobarba
}
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const LOCAL_IP: IpAddress = IpAddress::v4(10, 0, 0, 1);
const REMOTE_IP: IpAddress = IpAddress::v4(10, 0, 0, 2);
const LOCAL_PORT: u16 = 80;
const REMOTE_PORT: u16 = 49500;
const LOCAL_END: IpEndpoint = IpEndpoint::new(LOCAL_IP, LOCAL_PORT);
const REMOTE_END: IpEndpoint = IpEndpoint::new(REMOTE_IP, REMOTE_PORT);
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const LOCAL_SEQ: i32 = 10000;
const REMOTE_SEQ: i32 = -10000;
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const SEND_TEMPL: TcpRepr<'static> = TcpRepr {
src_port: REMOTE_PORT, dst_port: LOCAL_PORT,
control: TcpControl::None,
seq_number: 0, ack_number: Some(0),
window_len: 256, payload: &[]
};
const RECV_TEMPL: TcpRepr<'static> = TcpRepr {
src_port: LOCAL_PORT, dst_port: REMOTE_PORT,
control: TcpControl::None,
seq_number: 0, ack_number: Some(0),
window_len: 128, payload: &[]
};
fn send(socket: &mut TcpSocket, repr: &TcpRepr) -> Result<(), Error> {
let mut buffer = vec![0; repr.buffer_len()];
let mut packet = TcpPacket::new(&mut buffer).unwrap();
repr.emit(&mut packet, &REMOTE_IP, &LOCAL_IP);
let ip_repr = IpRepr::Unspecified {
src_addr: REMOTE_IP,
dst_addr: LOCAL_IP,
protocol: IpProtocol::Tcp
};
socket.collect(&ip_repr, &packet.into_inner()[..])
}
fn recv<F>(socket: &mut TcpSocket, mut f: F)
where F: FnMut(Result<TcpRepr, Error>) {
let mut buffer = vec![];
let result = socket.dispatch(&mut |ip_repr, payload| {
assert_eq!(ip_repr.protocol(), IpProtocol::Tcp);
assert_eq!(ip_repr.src_addr(), LOCAL_IP);
assert_eq!(ip_repr.dst_addr(), REMOTE_IP);
buffer.resize(payload.buffer_len(), 0);
payload.emit(&ip_repr, &mut buffer[..]);
let packet = TcpPacket::new(&buffer[..]).unwrap();
let repr = try!(TcpRepr::parse(&packet, &ip_repr.src_addr(), &ip_repr.dst_addr()));
Ok(f(Ok(repr)))
});
// Appease borrow checker.
match result {
Ok(()) => (),
Err(e) => f(Err(e))
}
}
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macro_rules! send {
($socket:ident, [$( $repr:expr )*]) => ({
$( send!($socket, $repr, Ok(())); )*
});
($socket:ident, $repr:expr, $result:expr) =>
(assert_eq!(send(&mut $socket, &$repr), $result))
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}
macro_rules! recv {
($socket:ident, [$( $repr:expr )*]) => ({
$( recv!($socket, Ok($repr)); )*
recv!($socket, Err(Error::Exhausted))
});
($socket:ident, $result:expr) =>
(recv(&mut $socket, |repr| assert_eq!(repr, $result)))
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}
fn init_logger() {
extern crate log;
use std::boxed::Box;
struct Logger(());
impl log::Log for Logger {
fn enabled(&self, _metadata: &log::LogMetadata) -> bool {
true
}
fn log(&self, record: &log::LogRecord) {
println!("{}", record.args());
}
}
let _ = log::set_logger(|max_level| {
max_level.set(log::LogLevelFilter::Trace);
Box::new(Logger(()))
});
println!("");
}
fn socket() -> TcpSocket<'static> {
init_logger();
let rx_buffer = SocketBuffer::new(vec![0; 128]);
let tx_buffer = SocketBuffer::new(vec![0; 128]);
match TcpSocket::new(rx_buffer, tx_buffer) {
Socket::Tcp(socket) => socket,
_ => unreachable!()
}
}
#[test]
fn test_handshake() {
let mut s = socket();
s.listen(IpEndpoint::new(IpAddress::default(), LOCAL_PORT));
assert_eq!(s.state(), State::Listen);
send!(s, [TcpRepr {
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control: TcpControl::Syn,
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seq_number: REMOTE_SEQ,
ack_number: None,
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..SEND_TEMPL
}]);
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assert_eq!(s.state(), State::SynReceived);
assert_eq!(s.local_endpoint(), LOCAL_END);
assert_eq!(s.remote_endpoint(), REMOTE_END);
recv!(s, [TcpRepr {
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control: TcpControl::Syn,
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seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
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..RECV_TEMPL
}]);
send!(s, [TcpRepr {
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seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
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..SEND_TEMPL
}]);
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assert_eq!(s.state(), State::Established);
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assert_eq!(s.local_seq_no, LOCAL_SEQ + 1);
assert_eq!(s.remote_seq_no, REMOTE_SEQ + 1);
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}
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#[test]
fn test_recv_data() {
let mut s = socket();
s.state = State::Established;
s.local_endpoint = LOCAL_END;
s.remote_endpoint = REMOTE_END;
s.local_seq_no = LOCAL_SEQ + 1;
s.remote_seq_no = REMOTE_SEQ + 1;
send!(s, [TcpRepr {
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seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
}]);
recv!(s, [TcpRepr {
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seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 122,
..RECV_TEMPL
}]);
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assert_eq!(s.rx_buffer.dequeue(6), &b"abcdef"[..]);
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}
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}