Taking into account TCP and IP header
The MTU consists of TCP header, IP header and the payload. In the former fix, this was not taken into account.v0.7.x
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@ -1559,7 +1559,7 @@ impl<'a> TcpSocket<'a> {
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// from the transmit buffer.
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let offset = self.remote_last_seq - self.local_seq_no;
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let size = cmp::min(cmp::min(self.remote_win_len, self.remote_mss),
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caps.max_transmission_unit);
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caps.max_transmission_unit - ip_repr.buffer_len() - repr.mss_header_len());
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repr.payload = self.tx_buffer.get_allocated(offset, size);
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// If we've sent everything we had in the buffer, follow it with the PSH or FIN
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// flags, depending on whether the transmit half of the connection is open.
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