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tcp: Undo the increase in sequence number by 1 due to the FIN flag in case of a transient error.

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If an error occurs while processing a TCP segment with some data and the FIN
flag, the back out of the sequence number advance does not take into account the
increase by 1 due to the FIN flag.

Reviewed By: jch, gnn, #transport, tuexen
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D2970
This commit is contained in:
Richard Scheffenegger 2022-07-14 02:49:10 +02:00
parent a7399ea2dd
commit 66605ff791
1 changed files with 6 additions and 1 deletions
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7
sys/netinet/tcp_output.c
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@ -1681,8 +1681,13 @@ timer:
tp->sackhint.sack_bytes_rexmit -= len;
KASSERT(tp->sackhint.sack_bytes_rexmit >= 0,
("sackhint bytes rtx >= 0"));
} else
KASSERT((flags & TH_FIN) == 0,
("error while FIN with SACK rxmit"));
} else {
tp->snd_nxt -= len;
if (flags & TH_FIN)
tp->snd_nxt--;
}
}
SOCKBUF_UNLOCK_ASSERT(&so->so_snd); /* Check gotos. */
switch (error) {