renet/src/socket/tcp.rs

3380 lines
121 KiB
Rust
Raw Normal View History

// Heads up! Before working on this file you should read, at least, RFC 793 and
// the parts of RFC 1122 that discuss TCP.
use core::{cmp, fmt};
2016-12-23 15:30:57 +08:00
use {Error, Result};
use phy::DeviceLimits;
use wire::{IpProtocol, IpAddress, IpEndpoint, TcpSeqNumber, TcpRepr, TcpControl};
use socket::{Socket, IpRepr};
use storage::{Assembler, RingBuffer};
2016-12-19 03:40:11 +08:00
pub type SocketBuffer<'a> = RingBuffer<'a, u8>;
/// The state of a TCP socket, according to [RFC 793][rfc793].
/// [rfc793]: https://tools.ietf.org/html/rfc793
2016-12-23 15:30:57 +08:00
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum State {
Closed,
Listen,
SynSent,
SynReceived,
Established,
FinWait1,
FinWait2,
CloseWait,
Closing,
LastAck,
TimeWait
}
2016-12-23 15:30:57 +08:00
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"),
2016-12-28 07:28:57 +08:00
&State::SynSent => write!(f, "SYN-SENT"),
&State::SynReceived => write!(f, "SYN-RECEIVED"),
2016-12-23 15:30:57 +08:00
&State::Established => write!(f, "ESTABLISHED"),
2016-12-28 07:28:57 +08:00
&State::FinWait1 => write!(f, "FIN-WAIT-1"),
&State::FinWait2 => write!(f, "FIN-WAIT-2"),
&State::CloseWait => write!(f, "CLOSE-WAIT"),
2016-12-23 15:30:57 +08:00
&State::Closing => write!(f, "CLOSING"),
2016-12-28 07:28:57 +08:00
&State::LastAck => write!(f, "LAST-ACK"),
&State::TimeWait => write!(f, "TIME-WAIT")
}
}
2016-12-23 15:30:57 +08:00
}
#[derive(Debug, Clone, Copy, PartialEq)]
enum Timer {
2017-09-16 18:54:59 +08:00
Idle {
keep_alive_at: Option<u64>,
},
Retransmit {
expires_at: u64,
delay: u64
},
Close {
expires_at: u64
}
}
const RETRANSMIT_DELAY: u64 = 100;
const CLOSE_DELAY: u64 = 10_000;
2017-09-16 18:54:59 +08:00
impl Default for Timer {
fn default() -> Timer {
Timer::Idle { keep_alive_at: None }
}
}
impl Timer {
2017-09-16 18:54:59 +08:00
fn should_keep_alive(&self, timestamp: u64) -> bool {
match *self {
Timer::Idle { keep_alive_at: Some(keep_alive_at) }
if timestamp >= keep_alive_at => {
true
}
_ => false
}
}
fn should_retransmit(&self, timestamp: u64) -> Option<u64> {
match *self {
Timer::Retransmit { expires_at, delay }
if timestamp >= expires_at => {
Some(timestamp - expires_at + delay)
}
_ => None
}
2016-12-23 15:30:57 +08:00
}
fn should_close(&self, timestamp: u64) -> bool {
match *self {
Timer::Close { expires_at }
if timestamp >= expires_at => {
true
}
_ => false
2016-12-31 16:35:07 +08:00
}
}
fn poll_at(&self) -> Option<u64> {
match *self {
2017-09-16 18:54:59 +08:00
Timer::Idle { keep_alive_at } => keep_alive_at,
Timer::Retransmit { expires_at, .. } => Some(expires_at),
2017-09-16 18:54:59 +08:00
Timer::Close { expires_at } => Some(expires_at),
}
}
2017-09-16 18:54:59 +08:00
fn set_for_idle(&mut self, timestamp: u64, interval: Option<u64>) {
*self = Timer::Idle {
keep_alive_at: interval.map(|interval| timestamp + interval)
}
}
fn set_keep_alive(&mut self) {
match *self {
Timer::Idle { ref mut keep_alive_at }
if keep_alive_at.is_none() => {
*keep_alive_at = Some(0)
}
_ => ()
}
}
fn rewind_keep_alive(&mut self, timestamp: u64, interval: Option<u64>) {
match self {
&mut Timer::Idle { ref mut keep_alive_at } => {
*keep_alive_at = interval.map(|interval| timestamp + interval)
}
_ => ()
}
}
fn set_for_retransmit(&mut self, timestamp: u64) {
match *self {
2017-09-16 18:54:59 +08:00
Timer::Idle { .. } => {
*self = Timer::Retransmit {
expires_at: timestamp + RETRANSMIT_DELAY,
delay: RETRANSMIT_DELAY,
}
}
Timer::Retransmit { expires_at, delay }
if timestamp >= expires_at => {
*self = Timer::Retransmit {
expires_at: timestamp + delay,
delay: delay * 2
}
}
Timer::Retransmit { .. } => (),
Timer::Close { .. } => ()
2016-12-31 16:35:07 +08:00
}
}
fn set_for_close(&mut self, timestamp: u64) {
*self = Timer::Close {
expires_at: timestamp + CLOSE_DELAY
2016-12-31 16:35:07 +08:00
}
}
}
/// A Transmission Control Protocol socket.
///
/// A TCP socket may passively listen for connections or actively connect to another endpoint.
/// Note that, for listening sockets, there is no "backlog"; to be able to simultaneously
/// accept several connections, as many sockets must be allocated, or any new connection
/// attempts will be reset.
2016-12-21 03:51:52 +08:00
#[derive(Debug)]
2016-12-23 15:30:57 +08:00
pub struct TcpSocket<'a> {
debug_id: usize,
2016-12-25 17:22:49 +08:00
state: State,
timer: Timer,
assembler: Assembler,
rx_buffer: SocketBuffer<'a>,
tx_buffer: SocketBuffer<'a>,
2017-09-18 19:05:40 +08:00
/// Interval after which, if no inbound packets are received, the connection is aborted.
timeout: Option<u64>,
2017-09-16 18:54:59 +08:00
/// Interval at which keep-alive packets will be sent.
keep_alive: Option<u64>,
2016-12-28 12:56:49 +08:00
/// Address passed to listen(). Listen address is set when listen() is called and
/// used every time the socket is reset back to the LISTEN state.
2016-12-26 21:54:26 +08:00
listen_address: IpAddress,
/// Current local endpoint. This is used for both filtering the incoming packets and
/// setting the source address. When listening or initiating connection on/from
/// an unspecified address, this field is updated with the chosen source address before
/// any packets are sent.
2016-12-25 17:22:49 +08:00
local_endpoint: IpEndpoint,
/// Current remote endpoint. This is used for both filtering the incoming packets and
2016-12-28 12:56:49 +08:00
/// setting the destination address. If the remote endpoint is unspecified, it means that
/// aborting the connection will not send an RST, and, in TIME-WAIT state, will not
/// send an ACK.
2016-12-25 17:22:49 +08:00
remote_endpoint: IpEndpoint,
/// The sequence number corresponding to the beginning of the transmit buffer.
/// I.e. an ACK(local_seq_no+n) packet removes n bytes from the transmit buffer.
local_seq_no: TcpSeqNumber,
/// The sequence number corresponding to the beginning of the receive buffer.
/// I.e. userspace reading n bytes adds n to remote_seq_no.
remote_seq_no: TcpSeqNumber,
/// The last sequence number sent.
/// I.e. in an idle socket, local_seq_no+tx_buffer.len().
remote_last_seq: TcpSeqNumber,
/// The last acknowledgement number sent.
/// I.e. in an idle socket, remote_seq_no+rx_buffer.len().
remote_last_ack: Option<TcpSeqNumber>,
/// The last window length sent.
remote_last_win: u16,
/// The speculative remote window size.
/// I.e. the actual remote window size minus the count of in-flight octets.
2016-12-25 19:09:50 +08:00
remote_win_len: usize,
/// The maximum number of data octets that the remote side may receive.
remote_mss: usize,
2017-09-18 19:05:40 +08:00
/// The timestamp of the last packet received.
remote_last_ts: Option<u64>,
2016-12-21 03:51:52 +08:00
}
2017-03-05 11:52:47 +08:00
const DEFAULT_MSS: usize = 536;
2016-12-23 15:30:57 +08:00
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, tx_buffer) = (rx_buffer.into(), tx_buffer.into());
2016-12-23 15:30:57 +08:00
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 {
debug_id: 0,
2016-12-25 17:22:49 +08:00
state: State::Closed,
2017-09-16 18:54:59 +08:00
timer: Timer::default(),
assembler: Assembler::new(rx_buffer.capacity()),
tx_buffer: tx_buffer,
rx_buffer: rx_buffer,
2017-09-18 19:05:40 +08:00
timeout: None,
2017-09-16 18:54:59 +08:00
keep_alive: None,
2016-12-26 21:54:26 +08:00
listen_address: IpAddress::default(),
2016-12-25 17:22:49 +08:00
local_endpoint: IpEndpoint::default(),
remote_endpoint: IpEndpoint::default(),
local_seq_no: TcpSeqNumber::default(),
remote_seq_no: TcpSeqNumber::default(),
remote_last_seq: TcpSeqNumber::default(),
remote_last_ack: None,
remote_last_win: 0,
remote_win_len: 0,
2017-03-05 11:52:47 +08:00
remote_mss: DEFAULT_MSS,
2017-09-18 19:05:40 +08:00
remote_last_ts: None,
2016-12-23 15:30:57 +08:00
})
}
/// Return the debug identifier.
#[inline]
pub fn debug_id(&self) -> usize {
self.debug_id
}
/// Set the debug identifier.
///
/// The debug identifier is a number printed in socket trace messages.
/// It could as well be used by the user code.
pub fn set_debug_id(&mut self, id: usize) {
self.debug_id = id
}
2017-09-18 19:05:40 +08:00
/// Return the timeout duration.
///
/// See also the [set_timeout](#method.set_timeout) method.
pub fn timeout(&self) -> Option<u64> {
self.timeout
}
/// Set the timeout duration.
///
/// A socket with a timeout duration set will abort the connection if either of the following
/// occurs:
///
/// * After a [connect](#method.connect) call, the remote endpoint does not respond within
/// the specified duration;
/// * After establishing a connection, there is data in the transmit buffer and the remote
/// endpoint exceeds the specified duration between any two packets it sends;
/// * After enabling [keep-alive](#method.set_keep_alive), the remote endpoint exceeds
/// the specified duration between any two packets it sends.
pub fn set_timeout(&mut self, duration: Option<u64>) {
self.timeout = duration
2017-09-18 19:05:40 +08:00
}
2017-09-16 18:54:59 +08:00
/// Return the keep-alive interval.
///
/// See also the [set_keep_alive](#method.set_keep_alive) method.
pub fn keep_alive(&self) -> Option<u64> {
self.keep_alive
}
/// Set the keep-alive interval.
///
2017-09-18 19:05:40 +08:00
/// An idle socket with a keep-alive interval set will transmit a "challenge ACK" packet
2017-09-16 18:54:59 +08:00
/// every time it receives no communication during that interval. As a result, three things
/// may happen:
///
/// * The remote endpoint is fine and answers with an ACK packet.
/// * The remote endpoint has rebooted and answers with an RST packet.
/// * The remote endpoint has crashed and does not answer.
///
/// The keep-alive functionality together with the timeout functionality allows to react
/// to these error conditions.
pub fn set_keep_alive(&mut self, interval: Option<u64>) {
self.keep_alive = interval;
if self.keep_alive.is_some() {
// If the connection is idle and we've just set the option, it would not take effect
// until the next packet, unless we wind up the timer explicitly.
self.timer.set_keep_alive();
}
}
2016-12-21 03:51:52 +08:00
/// Return the local endpoint.
2016-12-31 00:55:31 +08:00
#[inline]
2016-12-23 15:30:57 +08:00
pub fn local_endpoint(&self) -> IpEndpoint {
2016-12-25 17:22:49 +08:00
self.local_endpoint
2016-12-21 03:51:52 +08:00
}
/// Return the remote endpoint.
2016-12-31 00:55:31 +08:00
#[inline]
2016-12-23 15:30:57 +08:00
pub fn remote_endpoint(&self) -> IpEndpoint {
2016-12-25 17:22:49 +08:00
self.remote_endpoint
2016-12-21 03:51:52 +08:00
}
/// Return the connection state, in terms of the TCP state machine.
#[inline]
pub fn state(&self) -> State {
self.state
}
2017-03-05 11:52:47 +08:00
fn reset(&mut self) {
2017-04-22 00:01:49 +08:00
self.state = State::Closed;
2017-09-16 18:54:59 +08:00
self.timer = Timer::default();
self.assembler = Assembler::new(self.rx_buffer.capacity());
self.tx_buffer.clear();
self.rx_buffer.clear();
2017-09-16 18:54:59 +08:00
self.keep_alive = None;
2017-09-18 19:05:40 +08:00
self.timeout = None;
2017-03-05 11:52:47 +08:00
self.listen_address = IpAddress::default();
self.local_endpoint = IpEndpoint::default();
self.remote_endpoint = IpEndpoint::default();
self.local_seq_no = TcpSeqNumber::default();
self.remote_seq_no = TcpSeqNumber::default();
self.remote_last_seq = TcpSeqNumber::default();
self.remote_last_ack = None;
self.remote_last_win = 0;
2017-03-05 11:52:47 +08:00
self.remote_win_len = 0;
self.remote_mss = DEFAULT_MSS;
2017-09-18 19:05:40 +08:00
self.remote_last_ts = None;
2017-03-05 11:52:47 +08:00
}
2016-12-23 15:30:57 +08:00
/// Start listening on the given endpoint.
///
/// This function returns `Err(Error::Illegal)` if the socket was already open
/// (see [is_open](#method.is_open)), and `Err(Error::Unaddressable)`
/// if the port in the given endpoint is zero.
pub fn listen<T>(&mut self, local_endpoint: T) -> Result<()>
2017-03-05 11:52:47 +08:00
where T: Into<IpEndpoint> {
let local_endpoint = local_endpoint.into();
if local_endpoint.port == 0 { return Err(Error::Unaddressable) }
2017-03-05 11:52:47 +08:00
if self.is_open() { return Err(Error::Illegal) }
2016-12-23 15:59:38 +08:00
2017-03-05 11:52:47 +08:00
self.reset();
self.listen_address = local_endpoint.addr;
self.local_endpoint = local_endpoint;
2016-12-25 17:22:49 +08:00
self.remote_endpoint = IpEndpoint::default();
2016-12-23 15:59:38 +08:00
self.set_state(State::Listen);
Ok(())
}
2017-03-05 11:52:47 +08:00
/// Connect to a given endpoint.
///
/// The local port must be provided explicitly. Assuming `fn get_ephemeral_port() -> u16`
/// allocates a port between 49152 and 65535, a connection may be established as follows:
2017-03-05 11:52:47 +08:00
///
/// ```rust,ignore
/// socket.connect((IpAddress::v4(10, 0, 0, 1), 80), get_ephemeral_port())
/// ```
///
/// The local address may optionally be provided.
///
/// This function returns an error if the socket was open; see [is_open](#method.is_open).
2017-07-27 19:26:39 +08:00
/// It also returns an error if the local or remote port is zero, or if the remote address
/// is unspecified.
pub fn connect<T, U>(&mut self, remote_endpoint: T, local_endpoint: U) -> Result<()>
2017-03-05 11:52:47 +08:00
where T: Into<IpEndpoint>, U: Into<IpEndpoint> {
let remote_endpoint = remote_endpoint.into();
let local_endpoint = local_endpoint.into();
if self.is_open() { return Err(Error::Illegal) }
if !remote_endpoint.is_specified() { return Err(Error::Unaddressable) }
if local_endpoint.port == 0 { return Err(Error::Unaddressable) }
// If local address is not provided, use an unspecified address but a specified protocol.
// This lets us lower IpRepr later to determine IP header size and calculate MSS,
// but without committing to a specific address right away.
let local_addr = match remote_endpoint.addr {
IpAddress::Unspecified => return Err(Error::Unaddressable),
2017-07-27 19:26:07 +08:00
_ => remote_endpoint.addr.to_unspecified(),
};
let local_endpoint = IpEndpoint { addr: local_addr, ..local_endpoint };
2017-03-05 11:52:47 +08:00
// Carry over the local sequence number.
let local_seq_no = self.local_seq_no;
self.reset();
self.local_endpoint = local_endpoint;
self.remote_endpoint = remote_endpoint;
self.local_seq_no = local_seq_no;
self.remote_last_seq = local_seq_no;
2017-03-05 11:52:47 +08:00
self.set_state(State::SynSent);
Ok(())
}
2016-12-28 06:43:16 +08:00
/// Close the transmit half of the full-duplex connection.
///
/// Note that there is no corresponding function for the receive half of the full-duplex
/// connection; only the remote end can close it. If you no longer wish to receive any
/// data and would like to reuse the socket right away, use [abort](#method.abort).
pub fn close(&mut self) {
match self.state {
// In the LISTEN state there is no established connection.
State::Listen =>
self.set_state(State::Closed),
2016-12-28 07:28:57 +08:00
// In the SYN-SENT state the remote endpoint is not yet synchronized and, upon
2016-12-28 06:43:16 +08:00
// receiving an RST, will abort the connection.
State::SynSent =>
self.set_state(State::Closed),
2016-12-28 07:28:57 +08:00
// In the SYN-RECEIVED, ESTABLISHED and CLOSE-WAIT states the transmit half
2016-12-28 06:43:16 +08:00
// of the connection is open, and needs to be explicitly closed with a FIN.
2017-09-16 18:54:59 +08:00
State::SynReceived | State::Established =>
self.set_state(State::FinWait1),
State::CloseWait =>
self.set_state(State::LastAck),
2016-12-28 07:28:57 +08:00
// In the FIN-WAIT-1, FIN-WAIT-2, CLOSING, LAST-ACK, TIME-WAIT and CLOSED states,
2016-12-28 06:43:16 +08:00
// the transmit half of the connection is already closed, and no further
// action is needed.
State::FinWait1 | State::FinWait2 | State::Closing |
State::TimeWait | State::LastAck | State::Closed => ()
}
}
2017-01-17 09:24:51 +08:00
/// Aborts the connection, if any.
///
/// This function instantly closes the socket. One reset packet will be sent to the remote
/// endpoint.
///
/// In terms of the TCP state machine, the socket may be in any state and is moved to
/// the `CLOSED` state.
pub fn abort(&mut self) {
self.set_state(State::Closed);
}
/// Return whether the socket is passively listening for incoming connections.
///
/// In terms of the TCP state machine, the socket must be in the `LISTEN` state.
#[inline]
pub fn is_listening(&self) -> bool {
match self.state {
State::Listen => true,
_ => false
}
}
2016-12-28 02:54:45 +08:00
/// Return whether the socket is open.
///
/// This function returns true if the socket will process incoming or dispatch outgoing
/// packets. Note that this does not mean that it is possible to send or receive data through
/// the socket; for that, use [can_send](#method.can_send) or [can_recv](#method.can_recv).
///
/// In terms of the TCP state machine, the socket must be in the `CLOSED` or `TIME-WAIT` state.
#[inline]
pub fn is_open(&self) -> bool {
match self.state {
State::Closed => false,
State::TimeWait => false,
_ => true
}
}
/// Return whether a connection is active.
2016-12-28 02:54:45 +08:00
///
/// This function returns true if the socket is actively exchanging packets with
/// a remote endpoint. Note that this does not mean that it is possible to send or receive
/// data through the socket; for that, use [can_send](#method.can_send) or
/// [can_recv](#method.can_recv).
///
/// If a connection is established, [abort](#method.close) will send a reset to
/// the remote endpoint.
///
/// In terms of the TCP state machine, the socket must be in the `CLOSED`, `TIME-WAIT`,
/// or `LISTEN` state.
#[inline]
pub fn is_active(&self) -> bool {
2016-12-28 02:54:45 +08:00
match self.state {
State::Closed => false,
State::TimeWait => false,
State::Listen => false,
_ => true
}
}
/// Return whether the transmit half of the full-duplex connection is open.
///
/// This function returns true if it's possible to send data and have it arrive
/// to the remote endpoint. However, it does not make any guarantees about the state
/// of the transmit buffer, and even if it returns true, [send](#method.send) may
/// not be able to enqueue any octets.
///
/// In terms of the TCP state machine, the socket must be in the `ESTABLISHED` or
/// `CLOSE-WAIT` state.
#[inline]
pub fn may_send(&self) -> bool {
match self.state {
State::Established => true,
2016-12-28 07:28:57 +08:00
// In CLOSE-WAIT, the remote endpoint has closed our receive half of the connection
// but we still can transmit indefinitely.
State::CloseWait => true,
_ => false
}
}
/// Return whether the receive half of the full-duplex connection is open.
///
/// This function returns true if it's possible to receive data from the remote endpoint.
/// It will return true while there is data in the receive buffer, and if there isn't,
/// as long as the remote endpoint has not closed the connection.
///
/// In terms of the TCP state machine, the socket must be in the `ESTABLISHED`,
/// `FIN-WAIT-1`, or `FIN-WAIT-2` state, or have data in the receive buffer instead.
#[inline]
pub fn may_recv(&self) -> bool {
match self.state {
State::Established => true,
2016-12-28 07:28:57 +08:00
// In FIN-WAIT-1/2, we have closed our transmit half of the connection but
// we still can receive indefinitely.
State::FinWait1 | State::FinWait2 => true,
2016-12-28 04:17:46 +08:00
// If we have something in the receive buffer, we can receive that.
_ if self.rx_buffer.len() > 0 => true,
_ => false
}
2016-12-21 03:51:52 +08:00
}
/// Check whether the transmit half of the full-duplex connection is open
/// (see [may_send](#method.may_send), and the transmit buffer is not full.
#[inline]
pub fn can_send(&self) -> bool {
if !self.may_send() { return false }
!self.tx_buffer.is_full()
}
/// Check whether the receive half of the full-duplex connection buffer is open
/// (see [may_recv](#method.may_recv), and the receive buffer is not empty.
#[inline]
pub fn can_recv(&self) -> bool {
if !self.may_recv() { return false }
!self.rx_buffer.is_empty()
}
/// Enqueue a sequence of octets to be sent, and return a pointer to it.
///
/// This function may return a slice smaller than the requested size in case
/// there is not enough contiguous free space in the transmit buffer, down to
/// an empty slice.
///
/// This function returns `Err(Error::Illegal) if the transmit half of
/// the connection is not open; see [may_send](#method.may_send).
pub fn send(&mut self, size: usize) -> Result<&mut [u8]> {
if !self.may_send() { return Err(Error::Illegal) }
2017-09-18 19:05:40 +08:00
// The connection might have been idle for a long time, and so remote_last_ts
// would be far in the past. Unless we clear it here, we'll abort the connection
// down over in dispatch() by erroneously detecting it as timed out.
if self.tx_buffer.is_empty() { self.remote_last_ts = None }
let _old_length = self.tx_buffer.len();
let buffer = self.tx_buffer.enqueue_many(size);
if buffer.len() > 0 {
#[cfg(any(test, feature = "verbose"))]
net_trace!("[{}]{}:{}: tx buffer: enqueueing {} octets (now {})",
self.debug_id, self.local_endpoint, self.remote_endpoint,
buffer.len(), _old_length + buffer.len());
}
Ok(buffer)
}
/// Enqueue a sequence of octets to be sent, and fill it from a slice.
///
/// This function returns the amount of bytes actually enqueued, which is limited
/// by the amount of free space in the transmit buffer; down to zero.
///
/// See also [send](#method.send).
pub fn send_slice(&mut self, data: &[u8]) -> Result<usize> {
if !self.may_send() { return Err(Error::Illegal) }
2017-09-18 19:05:40 +08:00
// See above.
if self.tx_buffer.is_empty() { self.remote_last_ts = None }
2017-09-16 18:54:59 +08:00
let _old_length = self.tx_buffer.len();
let enqueued = self.tx_buffer.enqueue_slice(data);
if enqueued != 0 {
#[cfg(any(test, feature = "verbose"))]
net_trace!("[{}]{}:{}: tx buffer: enqueueing {} octets (now {})",
self.debug_id, self.local_endpoint, self.remote_endpoint,
2017-09-16 18:54:59 +08:00
enqueued, _old_length + enqueued);
}
Ok(enqueued)
}
/// Dequeue a sequence of received octets, and return a pointer to it.
///
/// This function may return a slice smaller than the requested size in case
/// there are not enough octets queued in the receive buffer, down to
/// an empty slice.
///
/// This function returns `Err(Error::Illegal) if the receive half of
/// the connection is not open; see [may_recv](#method.may_recv).
pub fn recv(&mut self, size: usize) -> Result<&[u8]> {
2017-01-27 06:04:05 +08:00
// We may have received some data inside the initial SYN, but until the connection
// is fully open we must not dequeue any data, as it may be overwritten by e.g.
// another (stale) SYN.
if !self.may_recv() { return Err(Error::Illegal) }
2017-09-23 01:38:58 +08:00
let _old_length = self.rx_buffer.len();
let buffer = self.rx_buffer.dequeue_many(size);
self.remote_seq_no += buffer.len();
if buffer.len() > 0 {
#[cfg(any(test, feature = "verbose"))]
net_trace!("[{}]{}:{}: rx buffer: dequeueing {} octets (now {})",
self.debug_id, self.local_endpoint, self.remote_endpoint,
2017-09-23 01:38:58 +08:00
buffer.len(), _old_length - buffer.len());
}
Ok(buffer)
}
/// Dequeue a sequence of received octets, and fill a slice from it.
///
/// This function returns the amount of bytes actually dequeued, which is limited
/// by the amount of free space in the transmit buffer; down to zero.
///
/// See also [recv](#method.recv).
pub fn recv_slice(&mut self, data: &mut [u8]) -> Result<usize> {
// See recv() above.
if !self.may_recv() { return Err(Error::Illegal) }
2017-09-23 01:38:58 +08:00
let _old_length = self.rx_buffer.len();
let dequeued = self.rx_buffer.dequeue_slice(data);
self.remote_seq_no += dequeued;
if dequeued > 0 {
#[cfg(any(test, feature = "verbose"))]
net_trace!("[{}]{}:{}: rx buffer: dequeueing {} octets (now {})",
self.debug_id, self.local_endpoint, self.remote_endpoint,
2017-09-23 01:38:58 +08:00
dequeued, _old_length - dequeued);
}
Ok(dequeued)
}
2017-08-21 14:12:09 +08:00
/// Peek at a sequence of received octets without removing them from
/// the receive buffer, and return a pointer to it.
///
/// This function otherwise behaves identically to [recv](#method.recv).
pub fn peek(&mut self, size: usize) -> Result<&[u8]> {
// See recv() above.
if !self.may_recv() { return Err(Error::Illegal) }
let buffer = self.rx_buffer.get_allocated(0, size);
2017-08-21 14:12:09 +08:00
if buffer.len() > 0 {
#[cfg(any(test, feature = "verbose"))]
net_trace!("[{}]{}:{}: rx buffer: peeking at {} octets",
self.debug_id, self.local_endpoint, self.remote_endpoint,
buffer.len());
}
Ok(buffer)
}
/// Peek at a sequence of received octets without removing them from
/// the receive buffer, and fill a slice from it.
///
/// This function otherwise behaves identically to [recv_slice](#method.recv_slice).
pub fn peek_slice(&mut self, data: &mut [u8]) -> Result<usize> {
let buffer = self.peek(data.len())?;
let data = &mut data[..buffer.len()];
data.copy_from_slice(buffer);
Ok(buffer.len())
}
/// Return the amount of octets queued in the transmit buffer.
///
/// Note that the Berkeley sockets interface does not have an equivalent of this API.
pub fn send_queue(&self) -> usize {
self.tx_buffer.len()
}
/// Return the amount of octets queued in the receive buffer.
///
/// Note that the Berkeley sockets interface does not have an equivalent of this API.
pub fn recv_queue(&self) -> usize {
self.rx_buffer.len()
}
fn set_state(&mut self, state: State) {
if self.state != state {
if self.remote_endpoint.addr.is_unspecified() {
net_trace!("[{}]{}: state={}=>{}",
self.debug_id, self.local_endpoint,
self.state, state);
} else {
net_trace!("[{}]{}:{}: state={}=>{}",
self.debug_id, self.local_endpoint, self.remote_endpoint,
self.state, state);
}
}
self.state = state
}
pub(crate) fn reply(ip_repr: &IpRepr, repr: &TcpRepr) -> (IpRepr, TcpRepr<'static>) {
let reply_repr = TcpRepr {
src_port: repr.dst_port,
dst_port: repr.src_port,
control: TcpControl::None,
seq_number: TcpSeqNumber(0),
ack_number: None,
window_len: 0,
max_seg_size: None,
payload: &[]
};
let ip_reply_repr = IpRepr::Unspecified {
src_addr: ip_repr.dst_addr(),
dst_addr: ip_repr.src_addr(),
protocol: IpProtocol::Tcp,
payload_len: reply_repr.buffer_len()
};
(ip_reply_repr, reply_repr)
}
pub(crate) fn rst_reply(ip_repr: &IpRepr, repr: &TcpRepr) -> (IpRepr, TcpRepr<'static>) {
debug_assert!(repr.control != TcpControl::Rst);
let (ip_reply_repr, mut reply_repr) = Self::reply(ip_repr, repr);
// See https://www.snellman.net/blog/archive/2016-02-01-tcp-rst/ for explanation
// of why we sometimes send an RST and sometimes an RST|ACK
reply_repr.control = TcpControl::Rst;
reply_repr.seq_number = repr.ack_number.unwrap_or_default();
if repr.control == TcpControl::Syn {
reply_repr.ack_number = Some(repr.seq_number + repr.segment_len());
}
(ip_reply_repr, reply_repr)
}
fn ack_reply(&self, ip_repr: &IpRepr, repr: &TcpRepr) -> (IpRepr, TcpRepr<'static>) {
let (ip_reply_repr, mut reply_repr) = Self::reply(ip_repr, repr);
// From RFC 793:
// [...] an empty acknowledgment segment containing the current send-sequence number
// and an acknowledgment indicating the next sequence number expected
// to be received.
reply_repr.seq_number = self.remote_last_seq;
reply_repr.ack_number = self.remote_last_ack;
reply_repr.window_len = self.rx_buffer.window() as u16;
(ip_reply_repr, reply_repr)
}
2017-09-01 05:44:41 +08:00
pub(crate) fn accepts(&self, ip_repr: &IpRepr, repr: &TcpRepr) -> bool {
if self.state == State::Closed { return false }
2016-12-21 03:51:52 +08:00
// If we're still listening for SYNs and the packet has an ACK, it cannot
// be destined to this socket, but another one may well listen on the same
// local endpoint.
2017-09-01 05:44:41 +08:00
if self.state == State::Listen && repr.ack_number.is_some() { return false }
2016-12-25 17:22:49 +08:00
// Reject packets with a wrong destination.
2017-09-01 05:44:41 +08:00
if self.local_endpoint.port != repr.dst_port { return false }
2016-12-25 17:22:49 +08:00
if !self.local_endpoint.addr.is_unspecified() &&
2017-09-01 05:44:41 +08:00
self.local_endpoint.addr != ip_repr.dst_addr() { return false }
2016-12-23 15:30:57 +08:00
2016-12-25 17:22:49 +08:00
// Reject packets from a source to which we aren't connected.
if self.remote_endpoint.port != 0 &&
2017-09-01 05:44:41 +08:00
self.remote_endpoint.port != repr.src_port { return false }
2016-12-25 17:22:49 +08:00
if !self.remote_endpoint.addr.is_unspecified() &&
2017-09-01 05:44:41 +08:00
self.remote_endpoint.addr != ip_repr.src_addr() { return false }
true
}
pub(crate) fn process(&mut self, timestamp: u64, ip_repr: &IpRepr, repr: &TcpRepr) ->
Result<Option<(IpRepr, TcpRepr<'static>)>> {
debug_assert!(self.accepts(ip_repr, repr));
2016-12-23 15:30:57 +08:00
// Consider how much the sequence number space differs from the transmit buffer space.
let (sent_syn, sent_fin) = match self.state {
// In SYN-SENT or SYN-RECEIVED, we've just sent a SYN.
State::SynSent | State::SynReceived => (true, false),
// In FIN-WAIT-1, LAST-ACK, or CLOSING, we've just sent a FIN.
State::FinWait1 | State::LastAck | State::Closing => (false, true),
// In all other states we've already got acknowledgemetns for
// all of the control flags we sent.
_ => (false, false)
};
let control_len = (sent_syn as usize) + (sent_fin as usize);
2016-12-25 19:09:50 +08:00
// Reject unacceptable acknowledgements.
2016-12-23 15:30:57 +08:00
match (self.state, repr) {
// An RST received in response to initial SYN is acceptable if it acknowledges
2016-12-26 21:10:39 +08:00
// the initial SYN.
(State::SynSent, &TcpRepr {
control: TcpControl::Rst, ack_number: None, ..
}) => {
net_debug!("[{}]{}:{}: unacceptable RST (expecting RST|ACK) \
2016-12-26 21:10:39 +08:00
in response to initial SYN",
self.debug_id, self.local_endpoint, self.remote_endpoint);
return Err(Error::Dropped)
2016-12-26 21:10:39 +08:00
}
(State::SynSent, &TcpRepr {
2016-12-26 21:10:39 +08:00
control: TcpControl::Rst, ack_number: Some(ack_number), ..
}) => {
if ack_number != self.local_seq_no + 1 {
net_debug!("[{}]{}:{}: unacceptable RST|ACK in response to initial SYN",
self.debug_id, self.local_endpoint, self.remote_endpoint);
return Err(Error::Dropped)
2016-12-26 21:10:39 +08:00
}
}
2016-12-28 04:17:35 +08:00
// Any other RST need only have a valid sequence number.
(_, &TcpRepr { control: TcpControl::Rst, .. }) => (),
// The initial SYN cannot contain an acknowledgement.
(State::Listen, &TcpRepr { ack_number: None, .. }) => (),
// This case is handled above.
(State::Listen, &TcpRepr { ack_number: Some(_), .. }) => unreachable!(),
2016-12-25 17:22:49 +08:00
// Every packet after the initial SYN must be an acknowledgement.
(_, &TcpRepr { ack_number: None, .. }) => {
net_debug!("[{}]{}:{}: expecting an ACK",
self.debug_id, self.local_endpoint, self.remote_endpoint);
return Err(Error::Dropped)
2016-12-25 17:22:49 +08:00
}
2016-12-25 19:09:50 +08:00
// Every acknowledgement must be for transmitted but unacknowledged data.
(_, &TcpRepr { ack_number: Some(ack_number), .. }) => {
let unacknowledged = self.tx_buffer.len() + control_len;
if ack_number < self.local_seq_no {
net_debug!("[{}]{}:{}: duplicate ACK ({} not in {}...{})",
self.debug_id, self.local_endpoint, self.remote_endpoint,
ack_number, self.local_seq_no, self.local_seq_no + unacknowledged);
// FIXME: implement fast retransmit
return Err(Error::Dropped)
}
if ack_number > self.local_seq_no + unacknowledged {
net_debug!("[{}]{}:{}: unacceptable ACK ({} not in {}...{})",
self.debug_id, self.local_endpoint, self.remote_endpoint,
2016-12-25 17:22:49 +08:00
ack_number, self.local_seq_no, self.local_seq_no + unacknowledged);
return Ok(Some(self.ack_reply(ip_repr, &repr)))
2016-12-25 17:22:49 +08:00
}
}
}
2016-12-23 15:30:57 +08:00
let payload_offset;
match self.state {
2016-12-28 07:28:57 +08:00
// In LISTEN and SYN-SENT states, we have not yet synchronized with the remote end.
State::Listen | State::SynSent =>
payload_offset = 0,
2016-12-26 21:54:26 +08:00
// In all other states, segments must occupy a valid portion of the receive window.
_ => {
let mut segment_in_window = true;
let window_start = self.remote_seq_no + self.rx_buffer.len();
let window_end = self.remote_seq_no + self.rx_buffer.capacity();
let segment_start = repr.seq_number;
let segment_end = repr.seq_number + repr.segment_len();
if window_start == window_end && segment_start != segment_end {
net_debug!("[{}]{}:{}: non-zero-length segment with zero receive window, \
will only send an ACK",
self.debug_id, self.local_endpoint, self.remote_endpoint);
segment_in_window = false;
}
if !((window_start <= segment_start && segment_start <= window_end) &&
(window_start <= segment_end && segment_end <= window_end)) {
net_debug!("[{}]{}:{}: segment not in receive window \
({}..{} not intersecting {}..{}), will send challenge ACK",
self.debug_id, self.local_endpoint, self.remote_endpoint,
segment_start, segment_end, window_start, window_end);
segment_in_window = false;
}
if segment_in_window {
// We've checked that segment_start >= window_start above.
payload_offset = (segment_start - window_start) as usize;
} else {
// If we're in the TIME-WAIT state, restart the TIME-WAIT timeout, since
// the remote end may not have realized we've closed the connection.
2017-04-22 00:01:49 +08:00
if self.state == State::TimeWait {
self.timer.set_for_close(timestamp);
2017-04-22 00:01:49 +08:00
}
return Ok(Some(self.ack_reply(ip_repr, &repr)))
2016-12-26 21:54:26 +08:00
}
2016-12-25 19:09:50 +08:00
}
}
// Compute the amount of acknowledged octets, removing the SYN and FIN bits
// from the sequence space.
let mut ack_len = 0;
let mut ack_of_fin = false;
if repr.control != TcpControl::Rst {
if let Some(ack_number) = repr.ack_number {
ack_len = ack_number - self.local_seq_no;
// There could have been no data sent before the SYN, so we always remove it
// from the sequence space.
if sent_syn {
ack_len -= 1
}
// We could've sent data before the FIN, so only remove FIN from the sequence
// space if all of that data is acknowledged.
if sent_fin && self.tx_buffer.len() + 1 == ack_len {
ack_len -= 1;
net_trace!("[{}]{}:{}: received ACK of FIN",
self.debug_id, self.local_endpoint, self.remote_endpoint);
ack_of_fin = true;
}
}
}
2016-12-25 19:09:50 +08:00
// Validate and update the state.
2017-09-22 14:29:25 +08:00
match (self.state, repr.control.quash_psh()) {
// RSTs are not accepted in the LISTEN state.
(State::Listen, TcpControl::Rst) =>
return Err(Error::Dropped),
2016-12-26 21:54:26 +08:00
2016-12-28 07:28:57 +08:00
// RSTs in SYN-RECEIVED flip the socket back to the LISTEN state.
(State::SynReceived, TcpControl::Rst) => {
net_trace!("[{}]{}:{}: received RST",
self.debug_id, self.local_endpoint, self.remote_endpoint);
2016-12-26 21:54:26 +08:00
self.local_endpoint.addr = self.listen_address;
self.remote_endpoint = IpEndpoint::default();
self.set_state(State::Listen);
return Ok(None)
2016-12-26 21:54:26 +08:00
}
// RSTs in any other state close the socket.
(_, TcpControl::Rst) => {
net_trace!("[{}]{}:{}: received RST",
self.debug_id, self.local_endpoint, self.remote_endpoint);
self.set_state(State::Closed);
2016-12-26 21:54:26 +08:00
self.local_endpoint = IpEndpoint::default();
self.remote_endpoint = IpEndpoint::default();
return Ok(None)
2016-12-26 21:54:26 +08:00
}
2016-12-28 07:28:57 +08:00
// SYN packets in the LISTEN state change it to SYN-RECEIVED.
(State::Listen, TcpControl::Syn) => {
net_trace!("[{}]{}: received SYN",
self.debug_id, self.local_endpoint);
self.local_endpoint = IpEndpoint::new(ip_repr.dst_addr(), repr.dst_port);
self.remote_endpoint = IpEndpoint::new(ip_repr.src_addr(), repr.src_port);
// FIXME: use something more secure here
self.local_seq_no = TcpSeqNumber(-repr.seq_number.0);
self.remote_seq_no = repr.seq_number + 1;
self.remote_last_seq = self.local_seq_no;
if let Some(max_seg_size) = repr.max_seg_size {
self.remote_mss = max_seg_size as usize
}
2016-12-23 15:59:38 +08:00
self.set_state(State::SynReceived);
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
2016-12-23 15:30:57 +08:00
}
2016-12-28 07:28:57 +08:00
// ACK packets in the SYN-RECEIVED state change it to ESTABLISHED.
(State::SynReceived, TcpControl::None) => {
2016-12-23 16:05:50 +08:00
self.set_state(State::Established);
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
2016-12-25 19:09:50 +08:00
}
2016-12-23 16:05:50 +08:00
// FIN packets in the SYN-RECEIVED state change it to CLOSE-WAIT.
// It's not obvious from RFC 793 that this is permitted, but
// 7th and 8th steps in the "SEGMENT ARRIVES" event describe this behavior.
(State::SynReceived, TcpControl::Fin) => {
self.remote_seq_no += 1;
self.set_state(State::CloseWait);
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
}
2017-03-05 11:52:47 +08:00
// SYN|ACK packets in the SYN-SENT state change it to ESTABLISHED.
(State::SynSent, TcpControl::Syn) => {
2017-03-05 11:52:47 +08:00
net_trace!("[{}]{}:{}: received SYN|ACK",
self.debug_id, self.local_endpoint, self.remote_endpoint);
self.local_endpoint = IpEndpoint::new(ip_repr.dst_addr(), repr.dst_port);
self.remote_seq_no = repr.seq_number + 1;
self.remote_last_seq = self.local_seq_no + 1;
if let Some(max_seg_size) = repr.max_seg_size {
2017-03-05 11:52:47 +08:00
self.remote_mss = max_seg_size as usize;
}
self.set_state(State::Established);
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
2017-03-05 11:52:47 +08:00
}
// ACK packets in ESTABLISHED state reset the retransmit timer.
(State::Established, TcpControl::None) => {
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
},
2016-12-25 19:09:50 +08:00
// FIN packets in ESTABLISHED state indicate the remote side has closed.
(State::Established, TcpControl::Fin) => {
2016-12-27 22:04:30 +08:00
self.remote_seq_no += 1;
self.set_state(State::CloseWait);
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
2016-12-28 12:02:43 +08:00
}
// ACK packets in FIN-WAIT-1 state change it to FIN-WAIT-2, if we've already
// sent everything in the transmit buffer. If not, they reset the retransmit timer.
(State::FinWait1, TcpControl::None) => {
if ack_of_fin {
self.set_state(State::FinWait2);
}
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
2016-12-28 12:02:43 +08:00
}
2017-04-22 00:01:49 +08:00
// FIN packets in FIN-WAIT-1 state change it to CLOSING, or to TIME-WAIT
// if they also acknowledge our FIN.
(State::FinWait1, TcpControl::Fin) => {
2016-12-28 12:02:43 +08:00
self.remote_seq_no += 1;
if ack_of_fin {
self.set_state(State::TimeWait);
self.timer.set_for_close(timestamp);
} else {
self.set_state(State::Closing);
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
}
}
2016-12-28 12:10:17 +08:00
// FIN packets in FIN-WAIT-2 state change it to TIME-WAIT.
(State::FinWait2, TcpControl::Fin) => {
2016-12-28 12:10:17 +08:00
self.remote_seq_no += 1;
self.set_state(State::TimeWait);
self.timer.set_for_close(timestamp);
2016-12-28 12:10:17 +08:00
}
2016-12-28 12:56:49 +08:00
// ACK packets in CLOSING state change it to TIME-WAIT.
(State::Closing, TcpControl::None) => {
if ack_of_fin {
self.set_state(State::TimeWait);
self.timer.set_for_close(timestamp);
} else {
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
}
2016-12-28 12:56:49 +08:00
}
// ACK packets in CLOSE-WAIT state reset the retransmit timer.
(State::CloseWait, TcpControl::None) => {
2017-09-16 18:54:59 +08:00
self.timer.set_for_idle(timestamp, self.keep_alive);
}
2016-12-28 07:28:57 +08:00
// ACK packets in LAST-ACK state change it to CLOSED.
(State::LastAck, TcpControl::None) => {
2016-12-28 07:27:33 +08:00
// Clear the remote endpoint, or we'll send an RST there.
self.set_state(State::Closed);
2016-12-28 07:27:33 +08:00
self.remote_endpoint = IpEndpoint::default();
}
2016-12-25 19:09:50 +08:00
_ => {
net_debug!("[{}]{}:{}: unexpected packet {}",
self.debug_id, self.local_endpoint, self.remote_endpoint, repr);
return Err(Error::Dropped)
2016-12-23 16:05:50 +08:00
}
2016-12-25 19:09:50 +08:00
}
2016-12-23 16:05:50 +08:00
2017-09-18 19:05:40 +08:00
// Update remote state.
self.remote_last_ts = Some(timestamp);
self.remote_win_len = repr.window_len as usize;
if ack_len > 0 {
// Dequeue acknowledged octets.
debug_assert!(self.tx_buffer.len() >= ack_len);
net_trace!("[{}]{}:{}: tx buffer: dequeueing {} octets (now {})",
self.debug_id, self.local_endpoint, self.remote_endpoint,
ack_len, self.tx_buffer.len() - ack_len);
self.tx_buffer.dequeue_allocated(ack_len);
}
if let Some(ack_number) = repr.ack_number {
// We've processed everything in the incoming segment, so advance the local
// sequence number past it.
2016-12-25 19:09:50 +08:00
self.local_seq_no = ack_number;
}
let payload_len = repr.payload.len();
if payload_len == 0 { return Ok(None) }
// Try adding payload octets to the assembler.
match self.assembler.add(payload_offset, payload_len) {
Ok(()) => {
debug_assert!(self.assembler.total_size() == self.rx_buffer.capacity());
// Place payload octets into the buffer.
net_trace!("[{}]{}:{}: rx buffer: writing {} octets at offset {}",
self.debug_id, self.local_endpoint, self.remote_endpoint,
payload_len, payload_offset);
self.rx_buffer.write_unallocated(payload_offset, repr.payload);
}
Err(()) => {
net_debug!("[{}]{}:{}: assembler: too many holes to add {} octets at offset {}",
self.debug_id, self.local_endpoint, self.remote_endpoint,
payload_len, payload_offset);
return Err(Error::Dropped)
}
}
if let Some(contig_len) = self.assembler.remove_front() {
debug_assert!(self.assembler.total_size() == self.rx_buffer.capacity());
// Enqueue the contiguous data octets in front of the buffer.
net_trace!("[{}]{}:{}: rx buffer: enqueueing {} octets (now {})",
self.debug_id, self.local_endpoint, self.remote_endpoint,
contig_len, self.rx_buffer.len() + contig_len);
self.rx_buffer.enqueue_unallocated(contig_len);
}
if self.assembler.is_empty() {
Ok(None)
} else {
// If the assembler isn't empty, some segments at the start of our window got lost.
// Send a reply acknowledging the data we already have; RFC 793 does not specify
// the behavior triggerd by such a reply, but RFC 1122 section 4.2.2.21 states that
// most congestion control algorithms implement what's called a "fast retransmit",
// where a threshold amount of duplicate ACKs triggers retransmission without
// the need to wait for a timeout to expire.
net_trace!("[{}]{}:{}: assembler: {}",
self.debug_id, self.local_endpoint, self.remote_endpoint,
self.assembler);
Ok(Some(self.ack_reply(ip_repr, &repr)))
}
2016-12-23 15:30:57 +08:00
}
2016-12-21 03:51:52 +08:00
2017-09-18 19:05:40 +08:00
fn timed_out(&self, timestamp: u64) -> bool {
match (self.remote_last_ts, self.timeout) {
(Some(remote_last_ts), Some(timeout)) =>
timestamp >= remote_last_ts + timeout,
(_, _) =>
false
}
}
fn seq_to_transmit(&self, control: TcpControl) -> bool {
self.remote_last_seq < self.local_seq_no + self.tx_buffer.len() + control.len()
}
fn ack_to_transmit(&self) -> bool {
if let Some(remote_last_ack) = self.remote_last_ack {
remote_last_ack < self.remote_seq_no + self.rx_buffer.len()
} else {
true
}
}
pub(crate) fn dispatch<F>(&mut self, timestamp: u64, limits: &DeviceLimits,
emit: F) -> Result<()>
where F: FnOnce((IpRepr, TcpRepr)) -> Result<()> {
if !self.remote_endpoint.is_specified() { return Err(Error::Exhausted) }
2016-12-28 12:56:49 +08:00
2017-09-18 19:05:40 +08:00
if self.remote_last_ts.is_none() {
// We get here in exactly two cases:
// 1) This socket just transitioned into SYN-SENT.
// 2) This socket had an empty transmit buffer and some data was added there.
// Both are similar in that the socket has been quiet for an indefinite
// period of time, it isn't anymore, and the local endpoint is talking.
// So, we start counting the timeout not from the last received packet
// but from the first transmitted one.
self.remote_last_ts = Some(timestamp);
}
if self.timed_out(timestamp) {
// If a timeout expires, we should abort the connection.
net_debug!("[{}]{}:{}: timeout exceeded",
self.debug_id, self.local_endpoint, self.remote_endpoint);
self.set_state(State::Closed);
} else if !self.seq_to_transmit(TcpControl::None) {
if let Some(retransmit_delta) = self.timer.should_retransmit(timestamp) {
// If a retransmit timer expired, we should resend data starting at the last ACK.
net_debug!("[{}]{}:{}: retransmitting at t+{}ms",
self.debug_id, self.local_endpoint, self.remote_endpoint,
retransmit_delta);
self.remote_last_seq = self.local_seq_no;
}
}
// Construct the lowered IP representation.
// We might need this to calculate the MSS, so do it early.
let mut ip_repr = IpRepr::Unspecified {
src_addr: self.local_endpoint.addr,
dst_addr: self.remote_endpoint.addr,
protocol: IpProtocol::Tcp,
payload_len: 0
}.lower(&[])?;
// Construct the basic TCP representation, an empty ACK packet.
// We'll adjust this to be more specific as needed.
2016-12-23 15:30:57 +08:00
let mut repr = TcpRepr {
src_port: self.local_endpoint.port,
dst_port: self.remote_endpoint.port,
control: TcpControl::None,
seq_number: self.remote_last_seq,
ack_number: Some(self.remote_seq_no + self.rx_buffer.len()),
window_len: self.rx_buffer.window() as u16,
max_seg_size: None,
payload: &[]
2016-12-23 15:30:57 +08:00
};
match self.state {
// We transmit an RST in the CLOSED state. If we ended up in the CLOSED state
// with a specified endpoint, it means that the socket was aborted.
State::Closed => {
repr.control = TcpControl::Rst;
2016-12-28 07:27:33 +08:00
}
2016-12-23 16:05:50 +08:00
// We never transmit anything in the LISTEN state.
State::Listen => return Err(Error::Exhausted),
2016-12-28 07:28:57 +08:00
// We transmit a SYN in the SYN-SENT state.
// We transmit a SYN|ACK in the SYN-RECEIVED state.
State::SynSent | State::SynReceived => {
2016-12-28 07:27:33 +08:00
repr.control = TcpControl::Syn;
if self.state == State::SynSent {
repr.ack_number = None;
}
2016-12-28 07:27:33 +08:00
}
// We transmit data in all states where we may have data in the buffer,
// or the transmit half of the connection is still open:
// the ESTABLISHED, FIN-WAIT-1, CLOSE-WAIT and LAST-ACK states.
State::Established | State::FinWait1 | State::CloseWait | State::LastAck => {
// Extract as much data as the remote side can receive in this packet
// from the transmit buffer.
let offset = self.remote_last_seq - self.local_seq_no;
let size = cmp::min(self.remote_win_len, self.remote_mss);
repr.payload = self.tx_buffer.get_allocated(offset, size);
// If we've sent everything we had in the buffer, follow it with the PSH or FIN
// flags, depending on whether the transmit half of the connection is open.
if offset + repr.payload.len() == self.tx_buffer.len() {
match self.state {
State::FinWait1 | State::LastAck =>
repr.control = TcpControl::Fin,
State::Established | State::CloseWait =>
repr.control = TcpControl::Psh,
_ => ()
2016-12-31 16:35:07 +08:00
}
2016-12-28 07:27:33 +08:00
}
}
2016-12-31 16:35:07 +08:00
// We do not transmit anything in the FIN-WAIT-2 state.
State::FinWait2 => return Err(Error::Exhausted),
// We do not transmit data or control flags in the CLOSING state, but we may
// retransmit an ACK.
State::Closing => (),
// Handling of the TIME-WAIT state is the same as for the CLOSING state, but also
// we wait for the timer to expire.
State::TimeWait => {
if self.timer.should_close(timestamp) {
net_trace!("[{}]{}:{}: TIME-WAIT timeout",
self.debug_id, self.local_endpoint, self.remote_endpoint);
self.reset();
return Err(Error::Exhausted)
}
}
2016-12-21 03:51:52 +08:00
}
2016-12-23 15:30:57 +08:00
if self.seq_to_transmit(repr.control) && repr.segment_len() > 0 {
// If we have data to transmit and it fits into partner's window, do it.
} else if self.ack_to_transmit() && repr.ack_number.is_some() {
// If we have data to acknowledge, do it.
} else if repr.window_len > self.remote_last_win {
// If we have window length increase to advertise, do it.
} else if self.timer.should_retransmit(timestamp).is_some() {
// If we have packets to retransmit, do it.
2017-09-16 18:54:59 +08:00
} else if self.timer.should_keep_alive(timestamp) {
// If we need to transmit a keep-alive packet, do it.
} else if repr.control == TcpControl::Rst {
// If we need to abort the connection, do it.
} else {
return Err(Error::Exhausted)
2016-12-26 22:24:17 +08:00
}
if repr.payload.len() > 0 {
net_trace!("[{}]{}:{}: tx buffer: reading {} octets at offset {}",
self.debug_id, self.local_endpoint, self.remote_endpoint,
repr.payload.len(), self.remote_last_seq - self.local_seq_no);
} else {
let flags =
match (repr.control, repr.ack_number) {
(TcpControl::Syn, None) => "SYN",
(TcpControl::Syn, Some(_)) => "SYN|ACK",
(TcpControl::Fin, Some(_)) => "FIN|ACK",
(TcpControl::Rst, Some(_)) => "RST|ACK",
(TcpControl::Psh, Some(_)) => "PSH|ACK",
(TcpControl::None, Some(_)) => "ACK",
_ => unreachable!()
};
net_trace!("[{}]{}:{}: sending {}",
self.debug_id, self.local_endpoint, self.remote_endpoint,
flags);
}
2016-12-31 16:35:07 +08:00
2017-09-16 18:54:59 +08:00
let is_keep_alive;
2017-09-18 19:05:40 +08:00
if self.timer.should_keep_alive(timestamp) && repr.is_empty() {
2017-09-16 18:54:59 +08:00
net_trace!("[{}]{}:{}: sending a keep-alive",
self.debug_id, self.local_endpoint, self.remote_endpoint);
repr.seq_number = repr.seq_number - 1;
repr.payload = b"\x00"; // RFC 1122 says we should do this
is_keep_alive = true;
} else {
is_keep_alive = false;
}
if repr.control == TcpControl::Syn {
// Compute the maximum segment size, deriving it from from the underlying
// maximum transmission unit and the IP and TCP header sizes.
//
// Note that what we actually *want* is for the other party to limit
// the total length of the TCP segment, but what we *get* is limiting
// the amount of data in the TCP segment. As a result, if they interpret
// the requirement naively and send us a TCP packet with both some options
// and an MSS-sized payload, that packet's last few bytes will get split
// into a tiny fragment.
//
// TCP is not a well-designed protocol.
let mut max_segment_size = limits.max_transmission_unit;
max_segment_size -= ip_repr.buffer_len();
max_segment_size -= repr.header_len();
repr.max_seg_size = Some(max_segment_size as u16);
}
ip_repr.set_payload_len(repr.buffer_len());
emit((ip_repr, repr))?;
2017-09-16 18:54:59 +08:00
// We've sent something, whether useful data or a keep-alive packet, so rewind
// the keep-alive timer.
self.timer.rewind_keep_alive(timestamp, self.keep_alive);
// Leave the rest of the state intact if sending a keep-alive packet.
if is_keep_alive { return Ok(()) }
// We've sent a packet successfully, so we can update the internal state now.
self.remote_last_seq = repr.seq_number + repr.segment_len();
self.remote_last_ack = repr.ack_number;
self.remote_last_win = repr.window_len;
2017-01-27 10:49:06 +08:00
if !self.seq_to_transmit(repr.control) && repr.segment_len() > 0 {
2017-09-16 18:54:59 +08:00
// If we've transmitted all data we could (and there was something at all,
// data or flag, to transmit, not just an ACK), wind up the retransmit timer.
self.timer.set_for_retransmit(timestamp);
}
if repr.control == TcpControl::Rst {
// When aborting a connection, forget about it after sending
// the RST packet once.
self.local_endpoint = IpEndpoint::default();
self.remote_endpoint = IpEndpoint::default();
2016-12-27 22:04:30 +08:00
}
Ok(())
2016-12-23 15:30:57 +08:00
}
pub(crate) fn poll_at(&self) -> Option<u64> {
2017-09-18 19:05:40 +08:00
self.timer.poll_at()
.or_else(|| {
match (self.remote_last_ts, self.timeout) {
(Some(remote_last_ts), Some(timeout))
if !self.tx_buffer.is_empty() =>
Some(remote_last_ts + timeout),
2017-09-22 18:01:59 +08:00
(None, Some(_timeout)) =>
2017-09-18 19:05:40 +08:00
Some(0),
(_, _) =>
None
}
})
}
2016-12-23 15:30:57 +08:00
}
2017-07-30 14:59:01 +08:00
impl<'a> fmt::Write for TcpSocket<'a> {
fn write_str(&mut self, slice: &str) -> fmt::Result {
let slice = slice.as_bytes();
if self.send_slice(slice) == Ok(slice.len()) {
Ok(())
} else {
Err(fmt::Error)
}
}
}
2016-12-19 03:40:11 +08:00
#[cfg(test)]
mod test {
2016-12-28 08:08:01 +08:00
use wire::{IpAddress, Ipv4Address};
2016-12-19 03:40:11 +08:00
use super::*;
2016-12-31 16:35:07 +08:00
#[test]
fn test_timer_retransmit() {
2017-09-16 18:54:59 +08:00
let mut r = Timer::default();
assert_eq!(r.should_retransmit(1000), None);
r.set_for_retransmit(1000);
assert_eq!(r.should_retransmit(1000), None);
assert_eq!(r.should_retransmit(1050), None);
assert_eq!(r.should_retransmit(1101), Some(101));
r.set_for_retransmit(1101);
assert_eq!(r.should_retransmit(1101), None);
assert_eq!(r.should_retransmit(1150), None);
assert_eq!(r.should_retransmit(1200), None);
assert_eq!(r.should_retransmit(1301), Some(300));
2017-09-16 18:54:59 +08:00
r.set_for_idle(1301, None);
assert_eq!(r.should_retransmit(1350), None);
2016-12-31 16:35:07 +08:00
}
2016-12-28 08:08:01 +08:00
const LOCAL_IP: IpAddress = IpAddress::Ipv4(Ipv4Address([10, 0, 0, 1]));
const REMOTE_IP: IpAddress = IpAddress::Ipv4(Ipv4Address([10, 0, 0, 2]));
const OTHER_IP: IpAddress = IpAddress::Ipv4(Ipv4Address([10, 0, 0, 3]));
const LOCAL_PORT: u16 = 80;
const REMOTE_PORT: u16 = 49500;
2016-12-28 08:08:01 +08:00
const LOCAL_END: IpEndpoint = IpEndpoint { addr: LOCAL_IP, port: LOCAL_PORT };
const REMOTE_END: IpEndpoint = IpEndpoint { addr: REMOTE_IP, port: REMOTE_PORT };
const LOCAL_SEQ: TcpSeqNumber = TcpSeqNumber(10000);
const REMOTE_SEQ: TcpSeqNumber = TcpSeqNumber(-10000);
2016-12-25 05:52:23 +08:00
const SEND_IP_TEMPL: IpRepr = IpRepr::Unspecified {
src_addr: LOCAL_IP, dst_addr: REMOTE_IP,
protocol: IpProtocol::Tcp, payload_len: 20
};
2016-12-25 05:52:23 +08:00
const SEND_TEMPL: TcpRepr<'static> = TcpRepr {
src_port: REMOTE_PORT, dst_port: LOCAL_PORT,
control: TcpControl::None,
seq_number: TcpSeqNumber(0), ack_number: Some(TcpSeqNumber(0)),
window_len: 256, max_seg_size: None,
payload: &[]
2016-12-25 05:52:23 +08:00
};
2017-09-15 14:05:41 +08:00
const _RECV_IP_TEMPL: IpRepr = IpRepr::Unspecified {
src_addr: REMOTE_IP, dst_addr: LOCAL_IP,
protocol: IpProtocol::Tcp, payload_len: 20
};
2016-12-25 05:52:23 +08:00
const RECV_TEMPL: TcpRepr<'static> = TcpRepr {
src_port: LOCAL_PORT, dst_port: REMOTE_PORT,
control: TcpControl::None,
seq_number: TcpSeqNumber(0), ack_number: Some(TcpSeqNumber(0)),
window_len: 64, max_seg_size: None,
payload: &[]
2016-12-25 05:52:23 +08:00
};
fn send(socket: &mut TcpSocket, timestamp: u64, repr: &TcpRepr) ->
Result<Option<TcpRepr<'static>>> {
let ip_repr = IpRepr::Unspecified {
src_addr: REMOTE_IP,
dst_addr: LOCAL_IP,
protocol: IpProtocol::Tcp,
payload_len: repr.buffer_len()
};
trace!("send: {}", repr);
2017-09-01 05:44:41 +08:00
assert!(socket.accepts(&ip_repr, repr));
match socket.process(timestamp, &ip_repr, repr) {
Ok(Some((_ip_repr, repr))) => {
trace!("recv: {}", repr);
Ok(Some(repr))
}
Ok(None) => Ok(None),
Err(err) => Err(err)
}
}
2016-12-31 16:35:07 +08:00
fn recv<F>(socket: &mut TcpSocket, timestamp: u64, mut f: F)
where F: FnMut(Result<TcpRepr>) {
let mut limits = DeviceLimits::default();
limits.max_transmission_unit = 1520;
let result = socket.dispatch(timestamp, &limits, |(ip_repr, tcp_repr)| {
let ip_repr = ip_repr.lower(&[LOCAL_END.addr.into()]).unwrap();
assert_eq!(ip_repr.protocol(), IpProtocol::Tcp);
assert_eq!(ip_repr.src_addr(), LOCAL_IP);
assert_eq!(ip_repr.dst_addr(), REMOTE_IP);
assert_eq!(ip_repr.payload_len(), tcp_repr.buffer_len());
trace!("recv: {}", tcp_repr);
Ok(f(Ok(tcp_repr)))
});
match result {
Ok(()) => (),
Err(e) => f(Err(e))
}
}
2016-12-25 05:52:23 +08:00
macro_rules! send {
2016-12-31 16:35:07 +08:00
($socket:ident, $repr:expr) =>
(send!($socket, time 0, $repr));
($socket:ident, $repr:expr, $result:expr) =>
2016-12-31 16:35:07 +08:00
(send!($socket, time 0, $repr, $result));
($socket:ident, time $time:expr, $repr:expr) =>
(send!($socket, time $time, $repr, Ok(None)));
2016-12-31 16:35:07 +08:00
($socket:ident, time $time:expr, $repr:expr, $result:expr) =>
(assert_eq!(send(&mut $socket, $time, &$repr), $result));
2016-12-25 05:52:23 +08:00
}
macro_rules! recv {
($socket:ident, [$( $repr:expr ),*]) => ({
$( recv!($socket, Ok($repr)); )*
recv!($socket, Err(Error::Exhausted))
});
($socket:ident, $result:expr) =>
2016-12-31 16:35:07 +08:00
(recv!($socket, time 0, $result));
($socket:ident, time $time:expr, $result:expr) =>
(recv(&mut $socket, $time, |result| {
// Most of the time we don't care about the PSH flag.
let result = result.map(|mut repr| {
2017-09-22 14:29:25 +08:00
repr.control = repr.control.quash_psh();
repr
});
assert_eq!(result, $result)
}));
($socket:ident, time $time:expr, $result:expr, exact) =>
2016-12-31 16:35:07 +08:00
(recv(&mut $socket, $time, |repr| assert_eq!(repr, $result)));
2016-12-25 05:52:23 +08:00
}
macro_rules! sanity {
($socket1:expr, $socket2:expr) => ({
let (s1, s2) = ($socket1, $socket2);
assert_eq!(s1.state, s2.state, "state");
assert_eq!(s1.listen_address, s2.listen_address, "listen_address");
assert_eq!(s1.local_endpoint, s2.local_endpoint, "local_endpoint");
assert_eq!(s1.remote_endpoint, s2.remote_endpoint, "remote_endpoint");
assert_eq!(s1.local_seq_no, s2.local_seq_no, "local_seq_no");
assert_eq!(s1.remote_seq_no, s2.remote_seq_no, "remote_seq_no");
assert_eq!(s1.remote_last_seq, s2.remote_last_seq, "remote_last_seq");
assert_eq!(s1.remote_last_ack, s2.remote_last_ack, "remote_last_ack");
assert_eq!(s1.remote_last_win, s2.remote_last_win, "remote_last_win");
assert_eq!(s1.remote_win_len, s2.remote_win_len, "remote_win_len");
assert_eq!(s1.timer, s2.timer, "timer");
})
}
2016-12-25 05:52:23 +08:00
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; 64]);
let tx_buffer = SocketBuffer::new(vec![0; 64]);
2016-12-25 05:52:23 +08:00
match TcpSocket::new(rx_buffer, tx_buffer) {
Socket::Tcp(socket) => socket,
_ => unreachable!()
}
}
2016-12-26 21:54:26 +08:00
// =========================================================================================//
// Tests for the CLOSED state.
// =========================================================================================//
2016-12-26 20:44:41 +08:00
#[test]
fn test_closed_reject() {
2017-09-15 14:05:41 +08:00
let s = socket();
2016-12-28 06:43:16 +08:00
assert_eq!(s.state, State::Closed);
2016-12-26 20:44:41 +08:00
let tcp_repr = TcpRepr {
2016-12-26 20:44:41 +08:00
control: TcpControl::Syn,
..SEND_TEMPL
};
assert!(!s.accepts(&SEND_IP_TEMPL, &tcp_repr));
2016-12-26 20:44:41 +08:00
}
#[test]
fn test_closed_reject_after_listen() {
let mut s = socket();
s.listen(LOCAL_END).unwrap();
s.close();
let tcp_repr = TcpRepr {
control: TcpControl::Syn,
..SEND_TEMPL
};
assert!(!s.accepts(&SEND_IP_TEMPL, &tcp_repr));
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_closed_close() {
let mut s = socket();
s.close();
assert_eq!(s.state, State::Closed);
}
2016-12-26 21:54:26 +08:00
// =========================================================================================//
// Tests for the LISTEN state.
// =========================================================================================//
fn socket_listen() -> TcpSocket<'static> {
2016-12-26 20:51:47 +08:00
let mut s = socket();
s.state = State::Listen;
s.local_endpoint = IpEndpoint::new(IpAddress::default(), LOCAL_PORT);
2016-12-26 21:54:26 +08:00
s
}
2016-12-25 05:52:23 +08:00
#[test]
fn test_listen_sanity() {
let mut s = socket();
s.listen(LOCAL_PORT).unwrap();
sanity!(s, socket_listen());
}
2017-03-05 11:52:47 +08:00
#[test]
fn test_listen_validation() {
let mut s = socket();
assert_eq!(s.listen(0), Err(Error::Unaddressable));
}
#[test]
fn test_listen_twice() {
let mut s = socket();
assert_eq!(s.listen(80), Ok(()));
assert_eq!(s.listen(80), Err(Error::Illegal));
2017-03-05 11:52:47 +08:00
}
#[test]
fn test_listen_syn() {
let mut s = socket_listen();
send!(s, TcpRepr {
control: TcpControl::Syn,
seq_number: REMOTE_SEQ,
ack_number: None,
..SEND_TEMPL
});
sanity!(s, socket_syn_received());
}
2016-12-26 21:54:26 +08:00
#[test]
fn test_listen_syn_reject_ack() {
2017-09-15 14:05:41 +08:00
let s = socket_listen();
let tcp_repr = TcpRepr {
2016-12-25 05:52:23 +08:00
control: TcpControl::Syn,
2016-12-25 19:09:50 +08:00
seq_number: REMOTE_SEQ,
2016-12-26 21:54:26 +08:00
ack_number: Some(LOCAL_SEQ),
2016-12-25 05:52:23 +08:00
..SEND_TEMPL
};
assert!(!s.accepts(&SEND_IP_TEMPL, &tcp_repr));
2016-12-26 21:54:26 +08:00
assert_eq!(s.state, State::Listen);
}
#[test]
fn test_listen_rst() {
let mut s = socket_listen();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-26 21:54:26 +08:00
control: TcpControl::Rst,
seq_number: REMOTE_SEQ,
ack_number: None,
2016-12-25 05:52:23 +08:00
..SEND_TEMPL
}, Err(Error::Dropped));
2016-12-25 05:52:23 +08:00
}
2016-12-25 19:09:50 +08:00
2016-12-28 06:43:16 +08:00
#[test]
fn test_listen_close() {
let mut s = socket_listen();
s.close();
assert_eq!(s.state, State::Closed);
}
2016-12-26 21:54:26 +08:00
// =========================================================================================//
2016-12-28 07:28:57 +08:00
// Tests for the SYN-RECEIVED state.
2016-12-26 21:54:26 +08:00
// =========================================================================================//
fn socket_syn_received() -> TcpSocket<'static> {
2016-12-26 20:44:41 +08:00
let mut s = socket();
2016-12-26 21:54:26 +08:00
s.state = State::SynReceived;
2016-12-26 20:44:41 +08:00
s.local_endpoint = LOCAL_END;
s.remote_endpoint = REMOTE_END;
2016-12-26 21:54:26 +08:00
s.local_seq_no = LOCAL_SEQ;
s.remote_seq_no = REMOTE_SEQ + 1;
s.remote_last_seq = LOCAL_SEQ;
s.remote_win_len = 256;
2016-12-26 21:54:26 +08:00
s
2016-12-26 20:44:41 +08:00
}
#[test]
fn test_syn_received_ack() {
let mut s = socket_syn_received();
recv!(s, [TcpRepr {
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
2017-01-27 10:49:06 +08:00
max_seg_size: Some(1480),
..RECV_TEMPL
}]);
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
});
assert_eq!(s.state, State::Established);
sanity!(s, socket_established());
}
#[test]
fn test_syn_received_fin() {
let mut s = socket_syn_received();
recv!(s, [TcpRepr {
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
max_seg_size: Some(1480),
..RECV_TEMPL
}]);
send!(s, TcpRepr {
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6 + 1),
window_len: 58,
..RECV_TEMPL
}]);
assert_eq!(s.state, State::CloseWait);
sanity!(s, TcpSocket {
remote_last_ack: Some(REMOTE_SEQ + 1 + 6 + 1),
remote_last_win: 58,
..socket_close_wait()
});
}
2016-12-26 20:44:41 +08:00
#[test]
2016-12-26 21:54:26 +08:00
fn test_syn_received_rst() {
let mut s = socket_syn_received();
recv!(s, [TcpRepr {
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
max_seg_size: Some(1480),
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-26 21:54:26 +08:00
control: TcpControl::Rst,
seq_number: REMOTE_SEQ + 1,
2016-12-26 20:51:47 +08:00
ack_number: Some(LOCAL_SEQ),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-26 21:54:26 +08:00
assert_eq!(s.state, State::Listen);
assert_eq!(s.local_endpoint, IpEndpoint::new(IpAddress::Unspecified, LOCAL_END.port));
assert_eq!(s.remote_endpoint, IpEndpoint::default());
2016-12-26 21:10:39 +08:00
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_syn_received_close() {
let mut s = socket_syn_received();
s.close();
assert_eq!(s.state, State::FinWait1);
}
2016-12-26 21:54:26 +08:00
// =========================================================================================//
2016-12-28 07:28:57 +08:00
// Tests for the SYN-SENT state.
2016-12-26 21:54:26 +08:00
// =========================================================================================//
fn socket_syn_sent() -> TcpSocket<'static> {
2016-12-26 21:10:39 +08:00
let mut s = socket();
s.state = State::SynSent;
s.local_endpoint = IpEndpoint::new(IpAddress::v4(0, 0, 0, 0), LOCAL_PORT);
2016-12-26 21:10:39 +08:00
s.remote_endpoint = REMOTE_END;
s.local_seq_no = LOCAL_SEQ;
s.remote_last_seq = LOCAL_SEQ;
2016-12-26 21:54:26 +08:00
s
}
2016-12-26 21:10:39 +08:00
2017-03-05 11:52:47 +08:00
#[test]
fn test_connect_validation() {
let mut s = socket();
assert_eq!(s.connect((IpAddress::v4(0, 0, 0, 0), 80), LOCAL_END),
Err(Error::Unaddressable));
assert_eq!(s.connect(REMOTE_END, (IpAddress::v4(10, 0, 0, 0), 0)),
Err(Error::Unaddressable));
assert_eq!(s.connect((IpAddress::v4(10, 0, 0, 0), 0), LOCAL_END),
Err(Error::Unaddressable));
assert_eq!(s.connect((IpAddress::Unspecified, 80), LOCAL_END),
Err(Error::Unaddressable));
2017-03-05 11:52:47 +08:00
}
#[test]
fn test_connect() {
let mut s = socket();
s.local_seq_no = LOCAL_SEQ;
s.connect(REMOTE_END, LOCAL_END.port).unwrap();
assert_eq!(s.local_endpoint, IpEndpoint::new(IpAddress::v4(0, 0, 0, 0), LOCAL_END.port));
recv!(s, [TcpRepr {
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: None,
max_seg_size: Some(1480),
..RECV_TEMPL
}]);
send!(s, TcpRepr {
control: TcpControl::Syn,
seq_number: REMOTE_SEQ,
ack_number: Some(LOCAL_SEQ + 1),
max_seg_size: Some(1400),
..SEND_TEMPL
});
assert_eq!(s.local_endpoint, LOCAL_END);
}
#[test]
fn test_connect_unspecified_local() {
let mut s = socket();
assert_eq!(s.connect(REMOTE_END, (IpAddress::v4(0, 0, 0, 0), 80)),
Ok(()));
s.abort();
assert_eq!(s.connect(REMOTE_END, (IpAddress::Unspecified, 80)),
Ok(()));
s.abort();
}
#[test]
fn test_connect_specified_local() {
let mut s = socket();
assert_eq!(s.connect(REMOTE_END, (IpAddress::v4(10, 0, 0, 2), 80)),
Ok(()));
}
#[test]
fn test_connect_twice() {
let mut s = socket();
assert_eq!(s.connect(REMOTE_END, (IpAddress::Unspecified, 80)),
Ok(()));
assert_eq!(s.connect(REMOTE_END, (IpAddress::Unspecified, 80)),
Err(Error::Illegal));
}
2017-03-05 11:52:47 +08:00
#[test]
fn test_syn_sent_sanity() {
let mut s = socket();
s.local_seq_no = LOCAL_SEQ;
s.connect(REMOTE_END, LOCAL_END).unwrap();
sanity!(s, socket_syn_sent());
}
#[test]
fn test_syn_sent_syn_ack() {
let mut s = socket_syn_sent();
recv!(s, [TcpRepr {
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: None,
max_seg_size: Some(1480),
..RECV_TEMPL
}]);
send!(s, TcpRepr {
control: TcpControl::Syn,
seq_number: REMOTE_SEQ,
ack_number: Some(LOCAL_SEQ + 1),
max_seg_size: Some(1400),
..SEND_TEMPL
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}]);
recv!(s, time 1000, Err(Error::Exhausted));
2017-03-05 11:52:47 +08:00
assert_eq!(s.state, State::Established);
sanity!(s, socket_established());
2017-03-05 11:52:47 +08:00
}
2016-12-26 21:54:26 +08:00
#[test]
fn test_syn_sent_rst() {
let mut s = socket_syn_sent();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-26 21:54:26 +08:00
control: TcpControl::Rst,
seq_number: REMOTE_SEQ,
ack_number: Some(LOCAL_SEQ + 1),
2016-12-26 21:54:26 +08:00
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-26 21:54:26 +08:00
assert_eq!(s.state, State::Closed);
}
#[test]
fn test_syn_sent_rst_no_ack() {
let mut s = socket_syn_sent();
2016-12-26 21:10:39 +08:00
send!(s, TcpRepr {
control: TcpControl::Rst,
seq_number: REMOTE_SEQ,
ack_number: None,
..SEND_TEMPL
}, Err(Error::Dropped));
2016-12-26 21:54:26 +08:00
assert_eq!(s.state, State::SynSent);
2016-12-26 21:10:39 +08:00
}
#[test]
2016-12-26 21:54:26 +08:00
fn test_syn_sent_rst_bad_ack() {
let mut s = socket_syn_sent();
2016-12-26 21:10:39 +08:00
send!(s, TcpRepr {
control: TcpControl::Rst,
seq_number: REMOTE_SEQ,
ack_number: Some(TcpSeqNumber(1234)),
2016-12-26 21:10:39 +08:00
..SEND_TEMPL
}, Err(Error::Dropped));
2016-12-26 21:54:26 +08:00
assert_eq!(s.state, State::SynSent);
2016-12-26 20:51:47 +08:00
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_syn_sent_close() {
let mut s = socket();
s.close();
assert_eq!(s.state, State::Closed);
}
2016-12-26 21:54:26 +08:00
// =========================================================================================//
// Tests for the ESTABLISHED state.
// =========================================================================================//
fn socket_established() -> TcpSocket<'static> {
let mut s = socket_syn_received();
s.state = State::Established;
2016-12-26 20:44:41 +08:00
s.local_seq_no = LOCAL_SEQ + 1;
s.remote_last_seq = LOCAL_SEQ + 1;
s.remote_last_ack = Some(REMOTE_SEQ + 1);
s.remote_last_win = 64;
2016-12-26 21:54:26 +08:00
s
}
#[test]
fn test_established_recv() {
2016-12-26 21:54:26 +08:00
let mut s = socket_established();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-26 21:54:26 +08:00
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
});
recv!(s, [TcpRepr {
2016-12-26 21:54:26 +08:00
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 58,
2016-12-26 21:54:26 +08:00
..RECV_TEMPL
}]);
assert_eq!(s.rx_buffer.dequeue_many(6), &b"abcdef"[..]);
2016-12-26 21:54:26 +08:00
}
2016-12-26 20:44:41 +08:00
2016-12-26 22:24:17 +08:00
#[test]
fn test_established_send() {
let mut s = socket_established();
// First roundtrip after establishing.
2016-12-31 16:35:07 +08:00
s.send_slice(b"abcdef").unwrap();
2016-12-26 22:24:17 +08:00
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}]);
assert_eq!(s.tx_buffer.len(), 6);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-26 22:24:17 +08:00
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-26 22:24:17 +08:00
assert_eq!(s.tx_buffer.len(), 0);
// Second roundtrip.
2016-12-31 16:35:07 +08:00
s.send_slice(b"foobar").unwrap();
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"foobar"[..],
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6 + 6),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
assert_eq!(s.tx_buffer.len(), 0);
2016-12-26 22:24:17 +08:00
}
#[test]
fn test_established_send_no_ack_send() {
let mut s = socket_established();
2016-12-31 16:35:07 +08:00
s.send_slice(b"abcdef").unwrap();
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
s.send_slice(b"foobar").unwrap();
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"foobar"[..],
..RECV_TEMPL
}]);
}
#[test]
fn test_established_send_buf_gt_win() {
let mut data = [0; 32];
for (i, elem) in data.iter_mut().enumerate() {
*elem = i as u8
}
let mut s = socket_established();
s.remote_win_len = 16;
s.send_slice(&data[..]).unwrap();
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &data[0..16],
..RECV_TEMPL
}, TcpRepr {
seq_number: LOCAL_SEQ + 1 + 16,
ack_number: Some(REMOTE_SEQ + 1),
payload: &data[16..32],
..RECV_TEMPL
}]);
}
2016-12-26 21:54:26 +08:00
#[test]
fn test_established_no_ack() {
let mut s = socket_established();
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: None,
..SEND_TEMPL
}, Err(Error::Dropped));
2016-12-26 21:54:26 +08:00
}
#[test]
fn test_established_bad_ack() {
let mut s = socket_established();
2016-12-26 20:44:41 +08:00
// Already acknowledged data.
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(TcpSeqNumber(LOCAL_SEQ.0 - 1)),
2016-12-26 20:44:41 +08:00
..SEND_TEMPL
}, Err(Error::Dropped));
2016-12-26 21:54:26 +08:00
assert_eq!(s.local_seq_no, LOCAL_SEQ + 1);
2016-12-26 20:44:41 +08:00
// Data not yet transmitted.
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 10),
..SEND_TEMPL
}, Ok(Some(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
})));
2016-12-26 21:54:26 +08:00
assert_eq!(s.local_seq_no, LOCAL_SEQ + 1);
2016-12-26 20:44:41 +08:00
}
#[test]
2016-12-26 21:54:26 +08:00
fn test_established_bad_seq() {
let mut s = socket_established();
2016-12-26 20:44:41 +08:00
// Data outside of receive window.
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1 + 256,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
}, Ok(Some(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
})));
2016-12-26 21:54:26 +08:00
assert_eq!(s.remote_seq_no, REMOTE_SEQ + 1);
2016-12-26 20:44:41 +08:00
}
#[test]
fn test_established_fin() {
let mut s = socket_established();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
assert_eq!(s.state, State::CloseWait);
sanity!(s, socket_close_wait());
}
#[test]
fn test_established_send_fin() {
let mut s = socket_established();
2016-12-31 16:35:07 +08:00
s.send_slice(b"abcdef").unwrap();
send!(s, TcpRepr {
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
assert_eq!(s.state, State::CloseWait);
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}]);
}
2016-12-25 19:09:50 +08:00
#[test]
2016-12-26 21:54:26 +08:00
fn test_established_rst() {
let mut s = socket_established();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-26 21:54:26 +08:00
control: TcpControl::Rst,
2016-12-25 19:09:50 +08:00
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-26 21:54:26 +08:00
assert_eq!(s.state, State::Closed);
}
2016-12-28 04:17:35 +08:00
#[test]
fn test_established_rst_no_ack() {
let mut s = socket_established();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 04:17:35 +08:00
control: TcpControl::Rst,
seq_number: REMOTE_SEQ + 1,
ack_number: None,
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 04:17:35 +08:00
assert_eq!(s.state, State::Closed);
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_established_close() {
let mut s = socket_established();
s.close();
assert_eq!(s.state, State::FinWait1);
sanity!(s, socket_fin_wait_1());
2016-12-28 06:43:16 +08:00
}
2017-01-17 09:24:51 +08:00
#[test]
fn test_established_abort() {
let mut s = socket_established();
s.abort();
assert_eq!(s.state, State::Closed);
recv!(s, [TcpRepr {
control: TcpControl::Rst,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}]);
}
2016-12-28 06:43:16 +08:00
// =========================================================================================//
2016-12-28 07:28:57 +08:00
// Tests for the FIN-WAIT-1 state.
2016-12-28 06:43:16 +08:00
// =========================================================================================//
fn socket_fin_wait_1() -> TcpSocket<'static> {
let mut s = socket_established();
s.state = State::FinWait1;
s
}
2016-12-28 12:02:43 +08:00
#[test]
fn test_fin_wait_1_fin_ack() {
let mut s = socket_fin_wait_1();
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 12:02:43 +08:00
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 12:02:43 +08:00
assert_eq!(s.state, State::FinWait2);
sanity!(s, socket_fin_wait_2());
2016-12-28 12:02:43 +08:00
}
#[test]
fn test_fin_wait_1_fin_fin() {
let mut s = socket_fin_wait_1();
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 12:02:43 +08:00
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 12:02:43 +08:00
assert_eq!(s.state, State::Closing);
sanity!(s, socket_closing());
2016-12-28 12:02:43 +08:00
}
#[test]
fn test_fin_wait_1_fin_with_data_queued() {
let mut s = socket_established();
s.remote_win_len = 6;
s.send_slice(b"abcdef123456").unwrap();
s.close();
recv!(s, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}));
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6),
..SEND_TEMPL
});
assert_eq!(s.state, State::FinWait1);
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_fin_wait_1_close() {
let mut s = socket_fin_wait_1();
s.close();
assert_eq!(s.state, State::FinWait1);
}
// =========================================================================================//
2016-12-28 07:28:57 +08:00
// Tests for the FIN-WAIT-2 state.
2016-12-28 06:43:16 +08:00
// =========================================================================================//
fn socket_fin_wait_2() -> TcpSocket<'static> {
let mut s = socket_fin_wait_1();
s.state = State::FinWait2;
s.local_seq_no = LOCAL_SEQ + 1 + 1;
s.remote_last_seq = LOCAL_SEQ + 1 + 1;
2016-12-28 06:43:16 +08:00
s
}
2016-12-28 12:10:17 +08:00
#[test]
fn test_fin_wait_2_fin() {
let mut s = socket_fin_wait_2();
2017-04-22 00:01:49 +08:00
send!(s, time 1_000, TcpRepr {
2016-12-28 12:10:17 +08:00
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 12:10:17 +08:00
assert_eq!(s.state, State::TimeWait);
sanity!(s, socket_time_wait(false));
2016-12-28 12:10:17 +08:00
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_fin_wait_2_close() {
let mut s = socket_fin_wait_2();
s.close();
assert_eq!(s.state, State::FinWait2);
}
// =========================================================================================//
// Tests for the CLOSING state.
// =========================================================================================//
fn socket_closing() -> TcpSocket<'static> {
let mut s = socket_fin_wait_1();
s.state = State::Closing;
s.remote_last_seq = LOCAL_SEQ + 1 + 1;
2016-12-28 06:43:16 +08:00
s.remote_seq_no = REMOTE_SEQ + 1 + 1;
s
}
2016-12-28 12:56:49 +08:00
#[test]
fn test_closing_ack_fin() {
let mut s = socket_closing();
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 1,
2016-12-28 12:56:49 +08:00
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
2017-04-22 00:01:49 +08:00
send!(s, time 1_000, TcpRepr {
2016-12-28 12:56:49 +08:00
seq_number: REMOTE_SEQ + 1 + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 12:56:49 +08:00
assert_eq!(s.state, State::TimeWait);
sanity!(s, socket_time_wait(true));
2016-12-28 12:56:49 +08:00
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_closing_close() {
let mut s = socket_closing();
s.close();
assert_eq!(s.state, State::Closing);
}
2016-12-28 12:10:17 +08:00
// =========================================================================================//
// Tests for the TIME-WAIT state.
// =========================================================================================//
2016-12-28 13:33:12 +08:00
fn socket_time_wait(from_closing: bool) -> TcpSocket<'static> {
2016-12-28 12:10:17 +08:00
let mut s = socket_fin_wait_2();
s.state = State::TimeWait;
s.remote_seq_no = REMOTE_SEQ + 1 + 1;
2016-12-28 13:33:12 +08:00
if from_closing {
s.remote_last_ack = Some(REMOTE_SEQ + 1 + 1);
2016-12-28 13:33:12 +08:00
}
s.timer = Timer::Close { expires_at: 1_000 + CLOSE_DELAY };
2016-12-28 12:10:17 +08:00
s
}
2016-12-28 13:33:12 +08:00
#[test]
fn test_time_wait_from_fin_wait_2_ack() {
let mut s = socket_time_wait(false);
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
}
#[test]
fn test_time_wait_from_closing_no_ack() {
let mut s = socket_time_wait(true);
recv!(s, []);
}
2016-12-28 12:10:17 +08:00
#[test]
fn test_time_wait_close() {
2016-12-28 13:33:12 +08:00
let mut s = socket_time_wait(false);
2016-12-28 12:10:17 +08:00
s.close();
assert_eq!(s.state, State::TimeWait);
}
2017-04-22 00:01:49 +08:00
#[test]
fn test_time_wait_retransmit() {
let mut s = socket_time_wait(false);
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
2017-04-22 00:01:49 +08:00
send!(s, time 5_000, TcpRepr {
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
}, Ok(Some(TcpRepr {
seq_number: LOCAL_SEQ + 1 + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
})));
assert_eq!(s.timer, Timer::Close { expires_at: 5_000 + CLOSE_DELAY });
2017-04-22 00:01:49 +08:00
}
#[test]
fn test_time_wait_timeout() {
let mut s = socket_time_wait(false);
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
assert_eq!(s.state, State::TimeWait);
recv!(s, time 60_000, Err(Error::Exhausted));
assert_eq!(s.state, State::Closed);
}
// =========================================================================================//
2016-12-28 07:28:57 +08:00
// Tests for the CLOSE-WAIT state.
// =========================================================================================//
fn socket_close_wait() -> TcpSocket<'static> {
let mut s = socket_established();
s.state = State::CloseWait;
s.remote_seq_no = REMOTE_SEQ + 1 + 1;
s.remote_last_ack = Some(REMOTE_SEQ + 1 + 1);
s
}
#[test]
fn test_close_wait_ack() {
let mut s = socket_close_wait();
2016-12-31 16:35:07 +08:00
s.send_slice(b"abcdef").unwrap();
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1 + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_close_wait_close() {
let mut s = socket_close_wait();
s.close();
assert_eq!(s.state, State::LastAck);
sanity!(s, socket_last_ack());
2016-12-28 06:43:16 +08:00
}
// =========================================================================================//
2016-12-28 07:28:57 +08:00
// Tests for the LAST-ACK state.
2016-12-28 06:43:16 +08:00
// =========================================================================================//
fn socket_last_ack() -> TcpSocket<'static> {
let mut s = socket_close_wait();
s.state = State::LastAck;
s
}
2016-12-28 07:27:33 +08:00
#[test]
fn test_last_ack_fin_ack() {
let mut s = socket_last_ack();
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
assert_eq!(s.state, State::LastAck);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 07:27:33 +08:00
seq_number: REMOTE_SEQ + 1 + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 07:27:33 +08:00
assert_eq!(s.state, State::Closed);
}
2016-12-28 06:43:16 +08:00
#[test]
fn test_last_ack_close() {
let mut s = socket_last_ack();
s.close();
assert_eq!(s.state, State::LastAck);
}
2016-12-26 21:54:26 +08:00
// =========================================================================================//
// Tests for transitioning through multiple states.
// =========================================================================================//
#[test]
fn test_listen() {
let mut s = socket();
2016-12-28 02:04:02 +08:00
s.listen(IpEndpoint::new(IpAddress::default(), LOCAL_PORT)).unwrap();
2016-12-26 21:54:26 +08:00
assert_eq!(s.state, State::Listen);
}
#[test]
fn test_three_way_handshake() {
2016-12-28 12:02:43 +08:00
let mut s = socket_listen();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-26 21:54:26 +08:00
control: TcpControl::Syn,
seq_number: REMOTE_SEQ,
ack_number: None,
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-26 21:54:26 +08:00
assert_eq!(s.state(), State::SynReceived);
assert_eq!(s.local_endpoint(), LOCAL_END);
assert_eq!(s.remote_endpoint(), REMOTE_END);
recv!(s, [TcpRepr {
2016-12-26 21:54:26 +08:00
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
2017-01-27 10:49:06 +08:00
max_seg_size: Some(1480),
2016-12-25 19:19:50 +08:00
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-26 21:54:26 +08:00
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-26 21:54:26 +08:00
assert_eq!(s.state(), State::Established);
assert_eq!(s.local_seq_no, LOCAL_SEQ + 1);
assert_eq!(s.remote_seq_no, REMOTE_SEQ + 1);
2016-12-25 19:09:50 +08:00
}
2016-12-28 12:02:43 +08:00
#[test]
fn test_remote_close() {
let mut s = socket_established();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 12:02:43 +08:00
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 12:02:43 +08:00
assert_eq!(s.state, State::CloseWait);
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
s.close();
assert_eq!(s.state, State::LastAck);
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 12:02:43 +08:00
seq_number: REMOTE_SEQ + 1 + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 13:33:12 +08:00
assert_eq!(s.state, State::Closed);
}
#[test]
fn test_local_close() {
let mut s = socket_established();
s.close();
assert_eq!(s.state, State::FinWait1);
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 13:33:12 +08:00
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 13:33:12 +08:00
assert_eq!(s.state, State::FinWait2);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 13:33:12 +08:00
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 13:33:12 +08:00
assert_eq!(s.state, State::TimeWait);
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
}
#[test]
fn test_simultaneous_close() {
let mut s = socket_established();
s.close();
assert_eq!(s.state, State::FinWait1);
recv!(s, [TcpRepr { // due to reordering, this is logically located...
2016-12-28 13:33:12 +08:00
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}]);
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 13:33:12 +08:00
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 13:33:12 +08:00
assert_eq!(s.state, State::Closing);
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 1,
2016-12-28 13:33:12 +08:00
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
// ... at this point
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
2016-12-28 13:33:12 +08:00
seq_number: REMOTE_SEQ + 1 + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
2016-12-31 16:35:07 +08:00
});
2016-12-28 13:33:12 +08:00
assert_eq!(s.state, State::TimeWait);
recv!(s, []);
2016-12-28 12:02:43 +08:00
}
#[test]
fn test_simultaneous_close_combined_fin_ack() {
let mut s = socket_established();
s.close();
assert_eq!(s.state, State::FinWait1);
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}]);
send!(s, TcpRepr {
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 1),
..SEND_TEMPL
});
assert_eq!(s.state, State::TimeWait);
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
}
#[test]
fn test_fin_with_data() {
let mut s = socket_established();
s.send_slice(b"abcdef").unwrap();
s.close();
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}])
}
#[test]
fn test_mutual_close_with_data_1() {
let mut s = socket_established();
s.send_slice(b"abcdef").unwrap();
s.close();
assert_eq!(s.state, State::FinWait1);
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}]);
send!(s, TcpRepr {
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6 + 1),
..SEND_TEMPL
});
}
#[test]
fn test_mutual_close_with_data_2() {
let mut s = socket_established();
s.send_slice(b"abcdef").unwrap();
s.close();
assert_eq!(s.state, State::FinWait1);
recv!(s, [TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}]);
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6 + 1),
..SEND_TEMPL
});
assert_eq!(s.state, State::FinWait2);
send!(s, TcpRepr {
control: TcpControl::Fin,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6 + 1),
..SEND_TEMPL
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6 + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
..RECV_TEMPL
}]);
assert_eq!(s.state, State::TimeWait);
}
// =========================================================================================//
// Tests for retransmission on packet loss.
// =========================================================================================//
fn socket_recved() -> TcpSocket<'static> {
let mut s = socket_established();
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 58,
..RECV_TEMPL
}]);
s
}
#[test]
fn test_duplicate_seq_ack() {
let mut s = socket_recved();
// remote retransmission
2016-12-31 16:35:07 +08:00
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
}, Ok(Some(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 58,
..RECV_TEMPL
})));
}
2016-12-31 16:35:07 +08:00
#[test]
fn test_data_retransmit() {
let mut s = socket_established();
s.send_slice(b"abcdef").unwrap();
recv!(s, time 1000, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}));
recv!(s, time 1050, Err(Error::Exhausted));
recv!(s, time 1100, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}));
}
#[test]
fn test_data_retransmit_bursts() {
let mut s = socket_established();
s.remote_win_len = 6;
s.send_slice(b"abcdef012345").unwrap();
recv!(s, time 0, Ok(TcpRepr {
control: TcpControl::None,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}), exact);
s.remote_win_len = 6;
recv!(s, time 0, Ok(TcpRepr {
control: TcpControl::Psh,
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"012345"[..],
..RECV_TEMPL
}), exact);
s.remote_win_len = 6;
recv!(s, time 0, Err(Error::Exhausted));
recv!(s, time 50, Err(Error::Exhausted));
recv!(s, time 100, Ok(TcpRepr {
control: TcpControl::None,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}), exact);
s.remote_win_len = 6;
recv!(s, time 150, Ok(TcpRepr {
control: TcpControl::Psh,
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"012345"[..],
..RECV_TEMPL
}), exact);
s.remote_win_len = 6;
recv!(s, time 200, Err(Error::Exhausted));
}
#[test]
fn test_send_data_after_syn_ack_retransmit() {
let mut s = socket_syn_received();
recv!(s, time 50, Ok(TcpRepr {
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
2017-01-27 10:49:06 +08:00
max_seg_size: Some(1480),
..RECV_TEMPL
}));
recv!(s, time 150, Ok(TcpRepr { // retransmit
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
2017-01-27 10:49:06 +08:00
max_seg_size: Some(1480),
..RECV_TEMPL
}));
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
});
assert_eq!(s.state(), State::Established);
s.send_slice(b"abcdef").unwrap();
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}])
}
#[test]
fn test_established_retransmit_reset_after_ack() {
let mut s = socket_established();
s.remote_win_len = 6;
s.send_slice(b"abcdef").unwrap();
s.send_slice(b"123456").unwrap();
s.send_slice(b"ABCDEF").unwrap();
recv!(s, time 1000, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}));
send!(s, time 1005, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6),
window_len: 6,
..SEND_TEMPL
});
recv!(s, time 1010, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"123456"[..],
..RECV_TEMPL
}));
send!(s, time 1015, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6 + 6),
window_len: 6,
..SEND_TEMPL
});
recv!(s, time 1020, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"ABCDEF"[..],
..RECV_TEMPL
}));
}
#[test]
fn test_close_wait_retransmit_reset_after_ack() {
let mut s = socket_close_wait();
s.remote_win_len = 6;
s.send_slice(b"abcdef").unwrap();
s.send_slice(b"123456").unwrap();
s.send_slice(b"ABCDEF").unwrap();
recv!(s, time 1000, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}));
send!(s, time 1005, TcpRepr {
seq_number: REMOTE_SEQ + 1 + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6),
window_len: 6,
..SEND_TEMPL
});
recv!(s, time 1010, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1 + 1),
payload: &b"123456"[..],
..RECV_TEMPL
}));
send!(s, time 1015, TcpRepr {
seq_number: REMOTE_SEQ + 1 + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6 + 6),
window_len: 6,
..SEND_TEMPL
});
recv!(s, time 1020, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6 + 6,
ack_number: Some(REMOTE_SEQ + 1 + 1),
payload: &b"ABCDEF"[..],
..RECV_TEMPL
}));
}
#[test]
fn test_fin_wait_1_retransmit_reset_after_ack() {
let mut s = socket_established();
s.remote_win_len = 6;
s.send_slice(b"abcdef").unwrap();
s.send_slice(b"123456").unwrap();
s.send_slice(b"ABCDEF").unwrap();
s.close();
recv!(s, time 1000, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}));
send!(s, time 1005, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6),
window_len: 6,
..SEND_TEMPL
});
recv!(s, time 1010, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"123456"[..],
..RECV_TEMPL
}));
send!(s, time 1015, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1 + 6 + 6),
window_len: 6,
..SEND_TEMPL
});
recv!(s, time 1020, Ok(TcpRepr {
control: TcpControl::Fin,
seq_number: LOCAL_SEQ + 1 + 6 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"ABCDEF"[..],
..RECV_TEMPL
}));
}
// =========================================================================================//
// Tests for window management.
// =========================================================================================//
#[test]
fn test_maximum_segment_size() {
let mut s = socket_listen();
s.tx_buffer = SocketBuffer::new(vec![0; 32767]);
send!(s, TcpRepr {
control: TcpControl::Syn,
seq_number: REMOTE_SEQ,
ack_number: None,
max_seg_size: Some(1000),
..SEND_TEMPL
});
recv!(s, [TcpRepr {
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
max_seg_size: Some(1480),
..RECV_TEMPL
}]);
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
window_len: 32767,
..SEND_TEMPL
});
s.send_slice(&[0; 1200][..]).unwrap();
recv!(s, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &[0; 1000][..],
..RECV_TEMPL
}));
}
// =========================================================================================//
// Tests for flow control.
// =========================================================================================//
#[test]
fn test_psh_transmit() {
let mut s = socket_established();
s.remote_win_len = 6;
s.send_slice(b"abcdef").unwrap();
s.send_slice(b"123456").unwrap();
recv!(s, time 0, Ok(TcpRepr {
control: TcpControl::None,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}), exact);
recv!(s, time 0, Ok(TcpRepr {
control: TcpControl::Psh,
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"123456"[..],
..RECV_TEMPL
}), exact);
}
#[test]
fn test_psh_receive() {
let mut s = socket_established();
send!(s, TcpRepr {
control: TcpControl::Psh,
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 58,
..RECV_TEMPL
}]);
}
#[test]
fn test_zero_window_ack() {
let mut s = socket_established();
s.rx_buffer = SocketBuffer::new(vec![0; 6]);
s.assembler = Assembler::new(s.rx_buffer.capacity());
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 0,
..RECV_TEMPL
}]);
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1 + 6,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"123456"[..],
..SEND_TEMPL
}, Ok(Some(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 0,
..RECV_TEMPL
})));
}
#[test]
fn test_zero_window_ack_on_window_growth() {
let mut s = socket_established();
s.rx_buffer = SocketBuffer::new(vec![0; 6]);
s.assembler = Assembler::new(s.rx_buffer.capacity());
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 0,
..RECV_TEMPL
}]);
recv!(s, time 0, Err(Error::Exhausted));
assert_eq!(s.recv(3), Ok(&b"abc"[..]));
recv!(s, time 0, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 3,
..RECV_TEMPL
}));
recv!(s, time 0, Err(Error::Exhausted));
assert_eq!(s.recv(3), Ok(&b"def"[..]));
recv!(s, time 0, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 6,
..RECV_TEMPL
}));
}
#[test]
fn test_fill_peer_window() {
let mut s = socket_established();
s.remote_mss = 6;
s.send_slice(b"abcdef123456!@#$%^").unwrap();
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}, TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"123456"[..],
..RECV_TEMPL
}, TcpRepr {
seq_number: LOCAL_SEQ + 1 + 6 + 6,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"!@#$%^"[..],
..RECV_TEMPL
}]);
}
2017-09-01 05:44:41 +08:00
2017-09-18 19:05:40 +08:00
// =========================================================================================//
// Tests for timeouts.
2017-09-18 19:05:40 +08:00
// =========================================================================================//
#[test]
fn test_connect_timeout() {
let mut s = socket();
s.local_seq_no = LOCAL_SEQ;
s.connect(REMOTE_END, LOCAL_END.port).unwrap();
s.set_timeout(Some(100));
recv!(s, time 150, Ok(TcpRepr {
control: TcpControl::Syn,
seq_number: LOCAL_SEQ,
ack_number: None,
max_seg_size: Some(1480),
..RECV_TEMPL
}));
assert_eq!(s.state, State::SynSent);
assert_eq!(s.poll_at(), Some(250));
recv!(s, time 250, Ok(TcpRepr {
control: TcpControl::Rst,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(TcpSeqNumber(0)),
..RECV_TEMPL
}));
assert_eq!(s.state, State::Closed);
}
#[test]
fn test_established_timeout() {
let mut s = socket_established();
s.set_timeout(Some(200));
recv!(s, time 250, Err(Error::Exhausted));
assert_eq!(s.poll_at(), None);
s.send_slice(b"abcdef").unwrap();
assert_eq!(s.poll_at(), Some(0));
recv!(s, time 255, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}));
assert_eq!(s.poll_at(), Some(355));
recv!(s, time 355, Ok(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"abcdef"[..],
..RECV_TEMPL
}));
assert_eq!(s.poll_at(), Some(455));
recv!(s, time 500, Ok(TcpRepr {
control: TcpControl::Rst,
seq_number: LOCAL_SEQ + 1 + 6,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}));
assert_eq!(s.state, State::Closed);
}
#[test]
fn test_established_keep_alive_timeout() {
let mut s = socket_established();
s.set_keep_alive(Some(50));
s.set_timeout(Some(100));
recv!(s, time 100, Ok(TcpRepr {
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
payload: &[0],
..RECV_TEMPL
}));
recv!(s, time 100, Err(Error::Exhausted));
assert_eq!(s.poll_at(), Some(150));
send!(s, time 105, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
});
assert_eq!(s.poll_at(), Some(155));
recv!(s, time 155, Ok(TcpRepr {
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
payload: &[0],
..RECV_TEMPL
}));
recv!(s, time 155, Err(Error::Exhausted));
assert_eq!(s.poll_at(), Some(205));
recv!(s, time 200, Err(Error::Exhausted));
recv!(s, time 205, Ok(TcpRepr {
control: TcpControl::Rst,
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
}));
recv!(s, time 205, Err(Error::Exhausted));
assert_eq!(s.state, State::Closed);
}
2017-09-16 18:54:59 +08:00
// =========================================================================================//
// Tests for keep-alive.
2017-09-16 18:54:59 +08:00
// =========================================================================================//
#[test]
fn test_responds_to_keep_alive() {
let mut s = socket_established();
send!(s, TcpRepr {
seq_number: REMOTE_SEQ,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
}, Ok(Some(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
})));
}
#[test]
fn test_sends_keep_alive() {
let mut s = socket_established();
s.set_keep_alive(Some(100));
// drain the forced keep-alive packet
assert_eq!(s.poll_at(), Some(0));
recv!(s, time 0, Ok(TcpRepr {
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
payload: &[0],
..RECV_TEMPL
}));
assert_eq!(s.poll_at(), Some(100));
recv!(s, time 95, Err(Error::Exhausted));
recv!(s, time 100, Ok(TcpRepr {
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
payload: &[0],
..RECV_TEMPL
}));
assert_eq!(s.poll_at(), Some(200));
recv!(s, time 195, Err(Error::Exhausted));
recv!(s, time 200, Ok(TcpRepr {
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
payload: &[0],
..RECV_TEMPL
}));
send!(s, time 250, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
..SEND_TEMPL
});
assert_eq!(s.poll_at(), Some(350));
recv!(s, time 345, Err(Error::Exhausted));
recv!(s, time 350, Ok(TcpRepr {
seq_number: LOCAL_SEQ,
ack_number: Some(REMOTE_SEQ + 1),
payload: &b"\x00"[..],
..RECV_TEMPL
}));
}
2017-09-01 05:44:41 +08:00
// =========================================================================================//
// Tests for reassembly.
// =========================================================================================//
#[test]
fn test_out_of_order() {
let mut s = socket_established();
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1 + 3,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"def"[..],
..SEND_TEMPL
}, Ok(Some(TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1),
..RECV_TEMPL
})));
assert_eq!(s.recv(10), Ok(&b""[..]));
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
});
recv!(s, [TcpRepr {
seq_number: LOCAL_SEQ + 1,
ack_number: Some(REMOTE_SEQ + 1 + 6),
window_len: 58,
..RECV_TEMPL
}]);
assert_eq!(s.recv(10), Ok(&b"abcdef"[..]));
}
#[test]
fn test_buffer_wraparound() {
let mut s = socket_established();
s.rx_buffer = SocketBuffer::new(vec![0; 6]);
s.assembler = Assembler::new(s.rx_buffer.capacity());
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abc"[..],
..SEND_TEMPL
});
assert_eq!(s.recv(3), Ok(&b"abc"[..]));
send!(s, TcpRepr {
seq_number: REMOTE_SEQ + 1 + 3,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"defghi"[..],
..SEND_TEMPL
});
let mut data = [0; 6];
assert_eq!(s.recv_slice(&mut data[..]), Ok(6));
assert_eq!(data, &b"defghi"[..]);
}
// =========================================================================================//
// Tests for packet filtering.
2017-09-01 05:44:41 +08:00
// =========================================================================================//
#[test]
fn test_doesnt_accept_wrong_port() {
let mut s = socket_established();
s.rx_buffer = SocketBuffer::new(vec![0; 6]);
s.assembler = Assembler::new(s.rx_buffer.capacity());
2017-09-01 05:44:41 +08:00
let tcp_repr = TcpRepr {
2017-09-01 05:44:41 +08:00
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
dst_port: LOCAL_PORT + 1,
..SEND_TEMPL
};
assert!(!s.accepts(&SEND_IP_TEMPL, &tcp_repr));
2017-09-01 05:44:41 +08:00
let tcp_repr = TcpRepr {
2017-09-01 05:44:41 +08:00
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
src_port: REMOTE_PORT + 1,
..SEND_TEMPL
};
assert!(!s.accepts(&SEND_IP_TEMPL, &tcp_repr));
2017-09-01 05:44:41 +08:00
}
#[test]
fn test_doesnt_accept_wrong_ip() {
let s = socket_established();
let tcp_repr = TcpRepr {
seq_number: REMOTE_SEQ + 1,
ack_number: Some(LOCAL_SEQ + 1),
payload: &b"abcdef"[..],
..SEND_TEMPL
};
let ip_repr = IpRepr::Unspecified {
src_addr: REMOTE_IP,
dst_addr: LOCAL_IP,
protocol: IpProtocol::Tcp,
payload_len: tcp_repr.buffer_len()
};
assert!(s.accepts(&ip_repr, &tcp_repr));
let ip_repr_wrong_src = IpRepr::Unspecified {
src_addr: OTHER_IP,
2017-09-01 05:44:41 +08:00
dst_addr: LOCAL_IP,
protocol: IpProtocol::Tcp,
payload_len: tcp_repr.buffer_len()
};
assert!(!s.accepts(&ip_repr_wrong_src, &tcp_repr));
let ip_repr_wrong_dst = IpRepr::Unspecified {
src_addr: REMOTE_IP,
dst_addr: OTHER_IP,
2017-09-01 05:44:41 +08:00
protocol: IpProtocol::Tcp,
payload_len: tcp_repr.buffer_len()
};
assert!(!s.accepts(&ip_repr_wrong_dst, &tcp_repr));
}
2016-12-19 03:40:11 +08:00
}