Fix an incorrect payload length when sending TCP MSS option.
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@ -965,6 +965,12 @@ impl<'a> TcpSocket<'a> {
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repr.ack_number = Some(ack_number);
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self.remote_last_ack = ack_number;
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if repr.control == TcpControl::Syn {
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// First enable the option, without assigning any value, to get a correct
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// result for (ip_repr:Unspecified).payload_len below.
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repr.max_seg_size = Some(0);
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}
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let ip_repr = IpRepr::Unspecified {
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src_addr: self.local_endpoint.addr,
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dst_addr: self.remote_endpoint.addr,
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