5d3b1b7556
with the FIN bit set for all segments, if a FIN has already been sent before. The fix will allow the FIN bit to be set for only the last segment, in case it has to be retransmitted. Fix another bug that would have caused snd_nxt to be pulled by len if there was an error from ip_output. snd_nxt should not be touched during sack retransmissions.
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