Don't respond with RST to ACKs in TCP LISTEN state.
These packets may have been destined for a different socket.
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591993014e
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15a344f1d3
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@ -574,10 +574,9 @@ impl<'a> TcpSocket<'a> {
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// Reject unacceptable acknowledgements.
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match (self.state, repr) {
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// The initial SYN (or whatever) cannot contain an acknowledgement.
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// It may be destined to another socket though.
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(State::Listen, TcpRepr { ack_number: Some(_), .. }) => {
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net_trace!("[{}]{}:{}: ACK received by a socket in LISTEN state",
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self.debug_id, self.local_endpoint, self.remote_endpoint);
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return Err(Error::Malformed)
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return Err(Error::Rejected)
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}
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(State::Listen, TcpRepr { ack_number: None, .. }) => (),
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// An RST received in response to initial SYN is acceptable if it acknowledges
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@ -1205,14 +1204,14 @@ mod test {
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}
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#[test]
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fn test_listen_syn_no_ack() {
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fn test_listen_syn_reject_ack() {
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let mut s = socket_listen();
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send!(s, TcpRepr {
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control: TcpControl::Syn,
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seq_number: REMOTE_SEQ,
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ack_number: Some(LOCAL_SEQ),
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..SEND_TEMPL
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}, Err(Error::Malformed));
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}, Err(Error::Rejected));
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assert_eq!(s.state, State::Listen);
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}
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