Send a challenge ACK in response to an unacceptable TCP ACK.
This commit is contained in:
parent
844843c4bc
commit
9b242c7099
|
@ -734,19 +734,20 @@ impl<'a> TcpSocket<'a> {
|
|||
// 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: instead of waiting for the retransmit timer to kick in,
|
||||
// reset it here.
|
||||
// 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,
|
||||
ack_number, self.local_seq_no, self.local_seq_no + unacknowledged);
|
||||
return Err(Error::Dropped)
|
||||
return Ok(Some(self.ack_reply(ip_repr, &repr)))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
@ -1870,7 +1871,11 @@ mod test {
|
|||
seq_number: REMOTE_SEQ + 1,
|
||||
ack_number: Some(LOCAL_SEQ + 10),
|
||||
..SEND_TEMPL
|
||||
}, Err(Error::Dropped));
|
||||
}, Ok(Some(TcpRepr {
|
||||
seq_number: LOCAL_SEQ + 1,
|
||||
ack_number: Some(REMOTE_SEQ + 1),
|
||||
..RECV_TEMPL
|
||||
})));
|
||||
assert_eq!(s.local_seq_no, LOCAL_SEQ + 1);
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue